fnmatch.c revision 90045 
1/*
2 * Copyright (c) 1989, 1993, 1994
3 *	The Regents of the University of California.  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)
38static char sccsid[] = "@(#)fnmatch.c	8.2 (Berkeley) 4/16/94";
39#endif /* LIBC_SCCS and not lint */
40#include <sys/cdefs.h>
41__FBSDID("$FreeBSD: head/lib/libc/gen/fnmatch.c 90045 2002-02-01 01:32:19Z obrien $");
42
43/*
44 * Function fnmatch() as specified in POSIX 1003.2-1992, section B.6.
45 * Compares a filename or pathname to a pattern.
46 */
47
48#include <ctype.h>
49#include <fnmatch.h>
50#include <string.h>
51#include <stdio.h>
52
53#include "collate.h"
54
55#define	EOS	'\0'
56
57#define RANGE_MATCH     1
58#define RANGE_NOMATCH   0
59#define RANGE_ERROR     (-1)
60
61static int rangematch(const char *, char, int, char **);
62
63int
64fnmatch(pattern, string, flags)
65	const char *pattern, *string;
66	int flags;
67{
68	const char *stringstart;
69	char *newp;
70	char c, test;
71
72	for (stringstart = string;;)
73		switch (c = *pattern++) {
74		case EOS:
75			if ((flags & FNM_LEADING_DIR) && *string == '/')
76				return (0);
77			return (*string == EOS ? 0 : FNM_NOMATCH);
78		case '?':
79			if (*string == EOS)
80				return (FNM_NOMATCH);
81			if (*string == '/' && (flags & FNM_PATHNAME))
82				return (FNM_NOMATCH);
83			if (*string == '.' && (flags & FNM_PERIOD) &&
84			    (string == stringstart ||
85			    ((flags & FNM_PATHNAME) && *(string - 1) == '/')))
86				return (FNM_NOMATCH);
87			++string;
88			break;
89		case '*':
90			c = *pattern;
91			/* Collapse multiple stars. */
92			while (c == '*')
93				c = *++pattern;
94
95			if (*string == '.' && (flags & FNM_PERIOD) &&
96			    (string == stringstart ||
97			    ((flags & FNM_PATHNAME) && *(string - 1) == '/')))
98				return (FNM_NOMATCH);
99
100			/* Optimize for pattern with * at end or before /. */
101			if (c == EOS)
102				if (flags & FNM_PATHNAME)
103					return ((flags & FNM_LEADING_DIR) ||
104					    strchr(string, '/') == NULL ?
105					    0 : FNM_NOMATCH);
106				else
107					return (0);
108			else if (c == '/' && flags & FNM_PATHNAME) {
109				if ((string = strchr(string, '/')) == NULL)
110					return (FNM_NOMATCH);
111				break;
112			}
113
114			/* General case, use recursion. */
115			while ((test = *string) != EOS) {
116				if (!fnmatch(pattern, string, flags & ~FNM_PERIOD))
117					return (0);
118				if (test == '/' && flags & FNM_PATHNAME)
119					break;
120				++string;
121			}
122			return (FNM_NOMATCH);
123		case '[':
124			if (*string == EOS)
125				return (FNM_NOMATCH);
126			if (*string == '/' && (flags & FNM_PATHNAME))
127				return (FNM_NOMATCH);
128			if (*string == '.' && (flags & FNM_PERIOD) &&
129			    (string == stringstart ||
130			    ((flags & FNM_PATHNAME) && *(string - 1) == '/')))
131				return (FNM_NOMATCH);
132
133			switch (rangematch(pattern, *string, flags, &newp)) {
134			case RANGE_ERROR:
135				goto norm;
136			case RANGE_MATCH:
137				pattern = newp;
138				break;
139			case RANGE_NOMATCH:
140				return (FNM_NOMATCH);
141			}
142			++string;
143			break;
144		case '\\':
145			if (!(flags & FNM_NOESCAPE)) {
146				if ((c = *pattern++) == EOS) {
147					c = '\\';
148					--pattern;
149				}
150			}
151			/* FALLTHROUGH */
152		default:
153		norm:
154			if (c == *string)
155				;
156			else if ((flags & FNM_CASEFOLD) &&
157				 (tolower((unsigned char)c) ==
158				  tolower((unsigned char)*string)))
159				;
160			else
161				return (FNM_NOMATCH);
162			string++;
163			break;
164		}
165	/* NOTREACHED */
166}
167
168static int
169rangematch(pattern, test, flags, newp)
170	const char *pattern;
171	char test;
172	int flags;
173	char **newp;
174{
175	int negate, ok;
176	char c, c2;
177
178	/*
179	 * A bracket expression starting with an unquoted circumflex
180	 * character produces unspecified results (IEEE 1003.2-1992,
181	 * 3.13.2).  This implementation treats it like '!', for
182	 * consistency with the regular expression syntax.
183	 * J.T. Conklin (conklin@ngai.kaleida.com)
184	 */
185	if ( (negate = (*pattern == '!' || *pattern == '^')) )
186		++pattern;
187
188	if (flags & FNM_CASEFOLD)
189		test = tolower((unsigned char)test);
190
191	/*
192	 * A right bracket shall lose its special meaning and represent
193	 * itself in a bracket expression if it occurs first in the list.
194	 * -- POSIX.2 2.8.3.2
195	 */
196	ok = 0;
197	c = *pattern++;
198	do {
199		if (c == '\\' && !(flags & FNM_NOESCAPE))
200			c = *pattern++;
201		if (c == EOS)
202			return (RANGE_ERROR);
203
204		if (c == '/' && (flags & FNM_PATHNAME))
205			return (RANGE_NOMATCH);
206
207		if (flags & FNM_CASEFOLD)
208			c = tolower((unsigned char)c);
209
210		if (*pattern == '-'
211		    && (c2 = *(pattern+1)) != EOS && c2 != ']') {
212			pattern += 2;
213			if (c2 == '\\' && !(flags & FNM_NOESCAPE))
214				c2 = *pattern++;
215			if (c2 == EOS)
216				return (RANGE_ERROR);
217
218			if (flags & FNM_CASEFOLD)
219				c2 = tolower((unsigned char)c2);
220
221			if (__collate_load_error ?
222			    c <= test && test <= c2 :
223			       __collate_range_cmp(c, test) <= 0
224			    && __collate_range_cmp(test, c2) <= 0
225			   )
226				ok = 1;
227		} else if (c == test)
228			ok = 1;
229	} while ((c = *pattern++) != ']');
230
231	*newp = (char *)pattern;
232	return (ok == negate ? RANGE_NOMATCH : RANGE_MATCH);
233}
234