1/*	$NetBSD: fnmatch.c,v 1.23 2011/01/31 15:07:29 christos Exp $	*/
2
3/*
4 * Copyright (c) 1989, 1993, 1994
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. Neither the name of the University nor the names of its contributors
19 *    may be used to endorse or promote products derived from this software
20 *    without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35#include <sys/cdefs.h>
36#if defined(LIBC_SCCS) && !defined(lint)
37#if 0
38static char sccsid[] = "@(#)fnmatch.c	8.2 (Berkeley) 4/16/94";
39#else
40__RCSID("$NetBSD: fnmatch.c,v 1.23 2011/01/31 15:07:29 christos Exp $");
41#endif
42#endif /* LIBC_SCCS and not lint */
43
44/*
45 * Function fnmatch() as specified in POSIX 1003.2-1992, section B.6.
46 * Compares a filename or pathname to a pattern.
47 */
48
49#include "namespace.h"
50
51#include <assert.h>
52#include <ctype.h>
53#include <fnmatch.h>
54#include <string.h>
55
56#ifdef __weak_alias
57__weak_alias(fnmatch,_fnmatch)
58#endif
59
60#define	EOS	'\0'
61
62static inline int
63foldcase(int ch, int flags)
64{
65
66	if ((flags & FNM_CASEFOLD) != 0 && isupper(ch))
67		return tolower(ch);
68	return ch;
69}
70
71#define	FOLDCASE(ch, flags)	foldcase((unsigned char)(ch), (flags))
72
73static const char *
74rangematch(const char *pattern, int test, int flags)
75{
76	int negate, ok;
77	char c, c2;
78
79	_DIAGASSERT(pattern != NULL);
80
81	/*
82	 * A bracket expression starting with an unquoted circumflex
83	 * character produces unspecified results (IEEE 1003.2-1992,
84	 * 3.13.2).  This implementation treats it like '!', for
85	 * consistency with the regular expression syntax.
86	 * J.T. Conklin (conklin@ngai.kaleida.com)
87	 */
88	if ((negate = (*pattern == '!' || *pattern == '^')) != 0)
89		++pattern;
90
91	for (ok = 0; (c = FOLDCASE(*pattern++, flags)) != ']';) {
92		if (c == '\\' && !(flags & FNM_NOESCAPE))
93			c = FOLDCASE(*pattern++, flags);
94		if (c == EOS)
95			return NULL;
96		if (*pattern == '-'
97		    && (c2 = FOLDCASE(*(pattern + 1), flags)) != EOS &&
98		        c2 != ']') {
99			pattern += 2;
100			if (c2 == '\\' && !(flags & FNM_NOESCAPE))
101				c2 = FOLDCASE(*pattern++, flags);
102			if (c2 == EOS)
103				return NULL;
104			if (c <= test && test <= c2)
105				ok = 1;
106		} else if (c == test)
107			ok = 1;
108	}
109	return ok == negate ? NULL : pattern;
110}
111
112
113static int
114fnmatchx(const char *pattern, const char *string, int flags, size_t recursion)
115{
116	const char *stringstart;
117	char c, test;
118
119	_DIAGASSERT(pattern != NULL);
120	_DIAGASSERT(string != NULL);
121
122	if (recursion-- == 0)
123		return FNM_NORES;
124
125	for (stringstart = string;;) {
126		switch (c = FOLDCASE(*pattern++, flags)) {
127		case EOS:
128			if ((flags & FNM_LEADING_DIR) && *string == '/')
129				return 0;
130			return *string == EOS ? 0 : FNM_NOMATCH;
131		case '?':
132			if (*string == EOS)
133				return FNM_NOMATCH;
134			if (*string == '/' && (flags & FNM_PATHNAME))
135				return FNM_NOMATCH;
136			if (*string == '.' && (flags & FNM_PERIOD) &&
137			    (string == stringstart ||
138			    ((flags & FNM_PATHNAME) && *(string - 1) == '/')))
139				return FNM_NOMATCH;
140			++string;
141			break;
142		case '*':
143			c = FOLDCASE(*pattern, flags);
144			/* Collapse multiple stars. */
145			while (c == '*')
146				c = FOLDCASE(*++pattern, flags);
147
148			if (*string == '.' && (flags & FNM_PERIOD) &&
149			    (string == stringstart ||
150			    ((flags & FNM_PATHNAME) && *(string - 1) == '/')))
151				return FNM_NOMATCH;
152
153			/* Optimize for pattern with * at end or before /. */
154			if (c == EOS) {
155				if (flags & FNM_PATHNAME)
156					return (flags & FNM_LEADING_DIR) ||
157					    strchr(string, '/') == NULL ?
158					    0 : FNM_NOMATCH;
159				else
160					return 0;
161			} else if (c == '/' && flags & FNM_PATHNAME) {
162				if ((string = strchr(string, '/')) == NULL)
163					return FNM_NOMATCH;
164				break;
165			}
166
167			/* General case, use recursion. */
168			while ((test = FOLDCASE(*string, flags)) != EOS) {
169				int e;
170				switch ((e = fnmatchx(pattern, string,
171				    flags & ~FNM_PERIOD, recursion))) {
172				case FNM_NOMATCH:
173					break;
174				default:
175					return e;
176				}
177				if (test == '/' && flags & FNM_PATHNAME)
178					break;
179				++string;
180			}
181			return FNM_NOMATCH;
182		case '[':
183			if (*string == EOS)
184				return FNM_NOMATCH;
185			if (*string == '/' && flags & FNM_PATHNAME)
186				return FNM_NOMATCH;
187			if ((pattern = rangematch(pattern,
188			    FOLDCASE(*string, flags), flags)) == NULL)
189				return FNM_NOMATCH;
190			++string;
191			break;
192		case '\\':
193			if (!(flags & FNM_NOESCAPE)) {
194				if ((c = FOLDCASE(*pattern++, flags)) == EOS) {
195					c = '\\';
196					--pattern;
197				}
198			}
199			/* FALLTHROUGH */
200		default:
201			if (c != FOLDCASE(*string++, flags))
202				return FNM_NOMATCH;
203			break;
204		}
205	}
206	/* NOTREACHED */
207}
208
209int
210fnmatch(const char *pattern, const char *string, int flags)
211{
212	return fnmatchx(pattern, string, flags, 64);
213}
214