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fnmatch.c revision 1.3 
      1 /*
      2  * Copyright (c) 1989 The Regents of the University of California.
      3  * All rights reserved.
      4  *
      5  * This code is derived from software contributed to Berkeley by
      6  * Guido van Rossum.
      7  *
      8  * Redistribution and use in source and binary forms, with or without
      9  * modification, are permitted provided that the following conditions
     10  * are met:
     11  * 1. Redistributions of source code must retain the above copyright
     12  *    notice, this list of conditions and the following disclaimer.
     13  * 2. Redistributions in binary form must reproduce the above copyright
     14  *    notice, this list of conditions and the following disclaimer in the
     15  *    documentation and/or other materials provided with the distribution.
     16  * 3. All advertising materials mentioning features or use of this software
     17  *    must display the following acknowledgement:
     18  *	This product includes software developed by the University of
     19  *	California, Berkeley and its contributors.
     20  * 4. Neither the name of the University nor the names of its contributors
     21  *    may be used to endorse or promote products derived from this software
     22  *    without specific prior written permission.
     23  *
     24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     34  * SUCH DAMAGE.
     35  */
     36 
     37 #if defined(LIBC_SCCS) && !defined(lint)
     38 static char sccsid[] = "@(#)fnmatch.c	5.6 (Berkeley) 6/28/92";
     39 #endif /* LIBC_SCCS and not lint */
     40 
     41 /*
     42  * Function fnmatch() as proposed in POSIX 1003.2 B.6 (D11.2).
     43  * Compares a filename or pathname to a pattern.
     44  */
     45 
     46 #include <fnmatch.h>
     47 #include <string.h>
     48 
     49 #define	EOS	'\0'
     50 
     51 static const char *rangematch __P((const char *, int));
     52 
     53 fnmatch(pattern, string, flags)
     54 	register const char *pattern, *string;
     55 	int flags;
     56 {
     57 	register char c;
     58 	char test;
     59 
     60 	for (;;)
     61 		switch (c = *pattern++) {
     62 		case EOS:
     63 			return (*string == EOS ? 0 : FNM_NOMATCH);
     64 		case '?':
     65 			if ((test = *string++) == EOS ||
     66 			    test == '/' && flags & FNM_PATHNAME)
     67 				return (FNM_NOMATCH);
     68 			break;
     69 		case '*':
     70 			c = *pattern;
     71 			/* Collapse multiple stars. */
     72 			while (c == '*')
     73 				c = *++pattern;
     74 
     75 			/* Optimize for pattern with * at end or before /. */
     76 			if (c == EOS)
     77 				if (flags & FNM_PATHNAME)
     78 					return (index(string, '/') == NULL ?
     79 					    0 : FNM_NOMATCH);
     80 				else
     81 					return (0);
     82 			else if (c == '/' && flags & FNM_PATHNAME) {
     83 				if ((string = index(string, '/')) == NULL)
     84 					return (FNM_NOMATCH);
     85 				break;
     86 			}
     87 
     88 			/* General case, use recursion. */
     89 			while ((test = *string) != EOS) {
     90 				if (!fnmatch(pattern, string, flags))
     91 					return (0);
     92 				if (test == '/' && flags & FNM_PATHNAME)
     93 					break;
     94 				++string;
     95 			}
     96 			return (FNM_NOMATCH);
     97 		case '[':
     98 			if ((test = *string++) == EOS ||
     99 			    test == '/' && flags & FNM_PATHNAME)
    100 				return (FNM_NOMATCH);
    101 			if ((pattern = rangematch(pattern, test)) == NULL)
    102 				return (FNM_NOMATCH);
    103 			break;
    104 		case '\\':
    105 			if (!(flags & FNM_NOESCAPE)) {
    106 				if ((c = *pattern++) == EOS) {
    107 					c = '\\';
    108 					--pattern;
    109 				}
    110 				if (c != *string++)
    111 					return (FNM_NOMATCH);
    112 				break;
    113 			}
    114 			/* FALLTHROUGH */
    115 		default:
    116 			if (c != *string++)
    117 				return (FNM_NOMATCH);
    118 			break;
    119 		}
    120 	/* NOTREACHED */
    121 }
    122 
    123 static const char *
    124 rangematch(pattern, test)
    125 	register const char *pattern;
    126 	register int test;
    127 {
    128 	register char c, c2;
    129 	int negate, ok;
    130 
    131 	if (negate = (*pattern == '!'))
    132 		++pattern;
    133 
    134 	/*
    135 	 * XXX
    136 	 * TO DO: quoting
    137 	 */
    138 	for (ok = 0; (c = *pattern++) != ']';) {
    139 		if (c == EOS)
    140 			return (NULL);		/* Illegal pattern. */
    141 		if (*pattern == '-' && (c2 = pattern[1]) != EOS && c2 != ']') {
    142 			if (c <= test && test <= c2)
    143 				ok = 1;
    144 			pattern += 2;
    145 		}
    146 		else if (c == test)
    147 			ok = 1;
    148 	}
    149 	return (ok == negate ? NULL : pattern);
    150 }
    151