1/*	$NetBSD: fnmatch.c,v 1.11 1995/02/27 03:43:06 cgd 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#if defined(LIBC_SCCS) && !defined(lint)
36#if 0
37static char sccsid[] = "@(#)fnmatch.c	8.2 (Berkeley) 4/16/94";
38#else
39static char rcsid[] = "$NetBSD: fnmatch.c,v 1.11 1995/02/27 03:43:06 cgd Exp $";
40#endif
41#endif /* LIBC_SCCS and not lint */
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#ifdef HAVE_CONFIG_H
49#include <config.h>
50#endif
51
52#include <roken.h>
53
54#include <fnmatch.h>
55#include <string.h>
56
57#define	EOS	'\0'
58
59static const char *rangematch (const char *, int, int);
60
61ROKEN_LIB_FUNCTION int ROKEN_LIB_CALL
62rk_fnmatch(const char *pattern, const char *string, int flags)
63{
64	const char *stringstart;
65	char c, test;
66
67	for (stringstart = string;;)
68		switch (c = *pattern++) {
69		case EOS:
70			return (*string == EOS ? 0 : FNM_NOMATCH);
71		case '?':
72			if (*string == EOS)
73				return (FNM_NOMATCH);
74			if (*string == '/' && (flags & FNM_PATHNAME))
75				return (FNM_NOMATCH);
76			if (*string == '.' && (flags & FNM_PERIOD) &&
77			    (string == stringstart ||
78			    ((flags & FNM_PATHNAME) && *(string - 1) == '/')))
79				return (FNM_NOMATCH);
80			++string;
81			break;
82		case '*':
83			c = *pattern;
84			/* Collapse multiple stars. */
85			while (c == '*')
86				c = *++pattern;
87
88			if (*string == '.' && (flags & FNM_PERIOD) &&
89			    (string == stringstart ||
90			    ((flags & FNM_PATHNAME) && *(string - 1) == '/')))
91				return (FNM_NOMATCH);
92
93			/* Optimize for pattern with * at end or before /. */
94			if (c == EOS)
95				if (flags & FNM_PATHNAME)
96					return (strchr(string, '/') == NULL ?
97					    0 : FNM_NOMATCH);
98				else
99					return (0);
100			else if (c == '/' && flags & FNM_PATHNAME) {
101				if ((string = strchr(string, '/')) == NULL)
102					return (FNM_NOMATCH);
103				break;
104			}
105
106			/* General case, use recursion. */
107			while ((test = *string) != EOS) {
108				if (!rk_fnmatch(pattern, string, flags & ~FNM_PERIOD))
109					return (0);
110				if (test == '/' && flags & FNM_PATHNAME)
111					break;
112				++string;
113			}
114			return (FNM_NOMATCH);
115		case '[':
116			if (*string == EOS)
117				return (FNM_NOMATCH);
118			if (*string == '/' && flags & FNM_PATHNAME)
119				return (FNM_NOMATCH);
120			if ((pattern =
121			    rangematch(pattern, *string, flags)) == NULL)
122				return (FNM_NOMATCH);
123			++string;
124			break;
125		case '\\':
126			if (!(flags & FNM_NOESCAPE)) {
127				if ((c = *pattern++) == EOS) {
128					c = '\\';
129					--pattern;
130				}
131			}
132			/* FALLTHROUGH */
133		default:
134			if (c != *string++)
135				return (FNM_NOMATCH);
136			break;
137		}
138	/* NOTREACHED */
139}
140
141static const char *
142rangematch(const char *pattern, int test, int flags)
143{
144	int negate, ok;
145	char c, c2;
146
147	/*
148	 * A bracket expression starting with an unquoted circumflex
149	 * character produces unspecified results (IEEE 1003.2-1992,
150	 * 3.13.2).  This implementation treats it like '!', for
151	 * consistency with the regular expression syntax.
152	 * J.T. Conklin (conklin@ngai.kaleida.com)
153	 */
154	if (negate = (*pattern == '!' || *pattern == '^'))
155		++pattern;
156
157	for (ok = 0; (c = *pattern++) != ']';) {
158		if (c == '\\' && !(flags & FNM_NOESCAPE))
159			c = *pattern++;
160		if (c == EOS)
161			return (NULL);
162		if (*pattern == '-'
163		    && (c2 = *(pattern+1)) != EOS && c2 != ']') {
164			pattern += 2;
165			if (c2 == '\\' && !(flags & FNM_NOESCAPE))
166				c2 = *pattern++;
167			if (c2 == EOS)
168				return (NULL);
169			if (c <= test && test <= c2)
170				ok = 1;
171		} else if (c == test)
172			ok = 1;
173	}
174	return (ok == negate ? NULL : pattern);
175}
176