1/*	$NetBSD: fnmatch.c,v 1.25 2012/03/25 16:31:23 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 1.25 2012/03/25 16:31:23 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, need;
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	need = 1;
92	for (ok = 0; (c = FOLDCASE(*pattern++, flags)) != ']' || need;) {
93		need = 0;
94		if (c == '/')
95			return (void *)-1;
96		if (c == '\\' && !(flags & FNM_NOESCAPE))
97			c = FOLDCASE(*pattern++, flags);
98		if (c == EOS)
99			return NULL;
100		if (*pattern == '-'
101		    && (c2 = FOLDCASE(*(pattern + 1), flags)) != EOS &&
102		        c2 != ']') {
103			pattern += 2;
104			if (c2 == '\\' && !(flags & FNM_NOESCAPE))
105				c2 = FOLDCASE(*pattern++, flags);
106			if (c2 == EOS)
107				return NULL;
108			if (c <= test && test <= c2)
109				ok = 1;
110		} else if (c == test)
111			ok = 1;
112	}
113	return ok == negate ? NULL : pattern;
114}
115
116
117static int
118fnmatchx(const char *pattern, const char *string, int flags, size_t recursion)
119{
120	const char *stringstart, *r;
121	char c, test;
122
123	_DIAGASSERT(pattern != NULL);
124	_DIAGASSERT(string != NULL);
125
126	if (recursion-- == 0)
127		return FNM_NORES;
128
129	for (stringstart = string;;) {
130		switch (c = FOLDCASE(*pattern++, flags)) {
131		case EOS:
132			if ((flags & FNM_LEADING_DIR) && *string == '/')
133				return 0;
134			return *string == EOS ? 0 : FNM_NOMATCH;
135		case '?':
136			if (*string == EOS)
137				return FNM_NOMATCH;
138			if (*string == '/' && (flags & FNM_PATHNAME))
139				return FNM_NOMATCH;
140			if (*string == '.' && (flags & FNM_PERIOD) &&
141			    (string == stringstart ||
142			    ((flags & FNM_PATHNAME) && *(string - 1) == '/')))
143				return FNM_NOMATCH;
144			++string;
145			break;
146		case '*':
147			c = FOLDCASE(*pattern, flags);
148			/* Collapse multiple stars. */
149			while (c == '*')
150				c = FOLDCASE(*++pattern, flags);
151
152			if (*string == '.' && (flags & FNM_PERIOD) &&
153			    (string == stringstart ||
154			    ((flags & FNM_PATHNAME) && *(string - 1) == '/')))
155				return FNM_NOMATCH;
156
157			/* Optimize for pattern with * at end or before /. */
158			if (c == EOS) {
159				if (flags & FNM_PATHNAME)
160					return (flags & FNM_LEADING_DIR) ||
161					    strchr(string, '/') == NULL ?
162					    0 : FNM_NOMATCH;
163				else
164					return 0;
165			} else if (c == '/' && flags & FNM_PATHNAME) {
166				if ((string = strchr(string, '/')) == NULL)
167					return FNM_NOMATCH;
168				break;
169			}
170
171			/* General case, use recursion. */
172			while ((test = FOLDCASE(*string, flags)) != EOS) {
173				int e;
174				switch ((e = fnmatchx(pattern, string,
175				    flags & ~FNM_PERIOD, recursion))) {
176				case FNM_NOMATCH:
177					break;
178				default:
179					return e;
180				}
181				if (test == '/' && flags & FNM_PATHNAME)
182					break;
183				++string;
184			}
185			return FNM_NOMATCH;
186		case '[':
187			if (*string == EOS)
188				return FNM_NOMATCH;
189			if (*string == '/' && flags & FNM_PATHNAME)
190				return FNM_NOMATCH;
191			if ((r = rangematch(pattern,
192			    FOLDCASE(*string, flags), flags)) == NULL)
193				return FNM_NOMATCH;
194			if (r == (void *)-1) {
195				if (*string != '[')
196					return FNM_NOMATCH;
197			} else
198				pattern = r;
199			++string;
200			break;
201		case '\\':
202			if (!(flags & FNM_NOESCAPE)) {
203				if ((c = FOLDCASE(*pattern++, flags)) == EOS) {
204					c = '\0';
205					--pattern;
206				}
207			}
208			/* FALLTHROUGH */
209		default:
210			if (c != FOLDCASE(*string++, flags))
211				return FNM_NOMATCH;
212			break;
213		}
214	}
215	/* NOTREACHED */
216}
217
218int
219fnmatch(const char *pattern, const char *string, int flags)
220{
221	return fnmatchx(pattern, string, flags, 64);
222}
223