fnmatch.c revision 331722 
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 * 4. Neither the name of the University nor the names of its contributors
17 *    may be used to endorse or promote products derived from this software
18 *    without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33#include <sys/cdefs.h>
34__FBSDID("$FreeBSD: stable/11/sys/libkern/fnmatch.c 331722 2018-03-29 02:50:57Z eadler $");
35
36/*
37 * Function fnmatch() as specified in POSIX 1003.2-1992, section B.6.
38 * Compares a filename or pathname to a pattern.
39 */
40
41#include <sys/param.h>
42#include <sys/ctype.h>
43#include <sys/libkern.h>
44
45#define	EOS	'\0'
46
47#define RANGE_MATCH     1
48#define RANGE_NOMATCH   0
49#define RANGE_ERROR     (-1)
50
51static int rangematch(const char *, char, int, char **);
52
53int
54fnmatch(const char *pattern, const char *string, int flags)
55{
56	const char *stringstart;
57	char *newp;
58	char c, test;
59
60	for (stringstart = string;;)
61		switch (c = *pattern++) {
62		case EOS:
63			if ((flags & FNM_LEADING_DIR) && *string == '/')
64				return (0);
65			return (*string == EOS ? 0 : FNM_NOMATCH);
66		case '?':
67			if (*string == EOS)
68				return (FNM_NOMATCH);
69			if (*string == '/' && (flags & FNM_PATHNAME))
70				return (FNM_NOMATCH);
71			if (*string == '.' && (flags & FNM_PERIOD) &&
72			    (string == stringstart ||
73			    ((flags & FNM_PATHNAME) && *(string - 1) == '/')))
74				return (FNM_NOMATCH);
75			++string;
76			break;
77		case '*':
78			c = *pattern;
79			/* Collapse multiple stars. */
80			while (c == '*')
81				c = *++pattern;
82
83			if (*string == '.' && (flags & FNM_PERIOD) &&
84			    (string == stringstart ||
85			    ((flags & FNM_PATHNAME) && *(string - 1) == '/')))
86				return (FNM_NOMATCH);
87
88			/* Optimize for pattern with * at end or before /. */
89			if (c == EOS)
90				if (flags & FNM_PATHNAME)
91					return ((flags & FNM_LEADING_DIR) ||
92					    strchr(string, '/') == NULL ?
93					    0 : FNM_NOMATCH);
94				else
95					return (0);
96			else if (c == '/' && flags & FNM_PATHNAME) {
97				if ((string = strchr(string, '/')) == NULL)
98					return (FNM_NOMATCH);
99				break;
100			}
101
102			/* General case, use recursion. */
103			while ((test = *string) != EOS) {
104				if (!fnmatch(pattern, string, flags & ~FNM_PERIOD))
105					return (0);
106				if (test == '/' && flags & FNM_PATHNAME)
107					break;
108				++string;
109			}
110			return (FNM_NOMATCH);
111		case '[':
112			if (*string == EOS)
113				return (FNM_NOMATCH);
114			if (*string == '/' && (flags & FNM_PATHNAME))
115				return (FNM_NOMATCH);
116			if (*string == '.' && (flags & FNM_PERIOD) &&
117			    (string == stringstart ||
118			    ((flags & FNM_PATHNAME) && *(string - 1) == '/')))
119				return (FNM_NOMATCH);
120
121			switch (rangematch(pattern, *string, flags, &newp)) {
122			case RANGE_ERROR:
123				goto norm;
124			case RANGE_MATCH:
125				pattern = newp;
126				break;
127			case RANGE_NOMATCH:
128				return (FNM_NOMATCH);
129			}
130			++string;
131			break;
132		case '\\':
133			if (!(flags & FNM_NOESCAPE)) {
134				if ((c = *pattern++) == EOS) {
135					c = '\\';
136					--pattern;
137				}
138			}
139			/* FALLTHROUGH */
140		default:
141		norm:
142			if (c == *string)
143				;
144			else if ((flags & FNM_CASEFOLD) &&
145				 (tolower((unsigned char)c) ==
146				  tolower((unsigned char)*string)))
147				;
148			else
149				return (FNM_NOMATCH);
150			string++;
151			break;
152		}
153	/* NOTREACHED */
154}
155
156static int
157rangematch(const char *pattern, char test, int flags, char **newp)
158{
159	int negate, ok;
160	char c, c2;
161
162	/*
163	 * A bracket expression starting with an unquoted circumflex
164	 * character produces unspecified results (IEEE 1003.2-1992,
165	 * 3.13.2).  This implementation treats it like '!', for
166	 * consistency with the regular expression syntax.
167	 * J.T. Conklin (conklin@ngai.kaleida.com)
168	 */
169	if ( (negate = (*pattern == '!' || *pattern == '^')) )
170		++pattern;
171
172	if (flags & FNM_CASEFOLD)
173		test = tolower((unsigned char)test);
174
175	/*
176	 * A right bracket shall lose its special meaning and represent
177	 * itself in a bracket expression if it occurs first in the list.
178	 * -- POSIX.2 2.8.3.2
179	 */
180	ok = 0;
181	c = *pattern++;
182	do {
183		if (c == '\\' && !(flags & FNM_NOESCAPE))
184			c = *pattern++;
185		if (c == EOS)
186			return (RANGE_ERROR);
187
188		if (c == '/' && (flags & FNM_PATHNAME))
189			return (RANGE_NOMATCH);
190
191		if (flags & FNM_CASEFOLD)
192			c = tolower((unsigned char)c);
193
194		if (*pattern == '-'
195		    && (c2 = *(pattern+1)) != EOS && c2 != ']') {
196			pattern += 2;
197			if (c2 == '\\' && !(flags & FNM_NOESCAPE))
198				c2 = *pattern++;
199			if (c2 == EOS)
200				return (RANGE_ERROR);
201
202			if (flags & FNM_CASEFOLD)
203				c2 = tolower((unsigned char)c2);
204
205			if (c <= test && test <= c2)
206				ok = 1;
207		} else if (c == test)
208			ok = 1;
209	} while ((c = *pattern++) != ']');
210
211	*newp = (char *)(uintptr_t)pattern;
212	return (ok == negate ? RANGE_NOMATCH : RANGE_MATCH);
213}
214