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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  * From FreeBSD fnmatch.c 1.11
37  * $Id: fnmatch.c,v 1.3 1997/08/19 02:34:30 jdp Exp $
38  */
39
40 #if defined(LIBC_SCCS) && !defined(lint)
41 static char sccsid[] = "@(#)fnmatch.c   8.2 (Berkeley) 4/16/94";
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 <ctype.h>
50 #include <string.h>
51 #include <stdio.h>
52
53 #include "fnmatch.h"
54
55 #define EOS     '\0'
56
57 static const char *rangematch(const char *, char, int);
58
59 int
60 fnmatch(const char *pattern, const char *string, int flags)
61 {
62         const char *stringstart;
63         char c, test;
64
65         for (stringstart = string;;)
66                 switch (c = *pattern++) {
67                 case EOS:
68                         if ((flags & FNM_LEADING_DIR) && *string == '/')
69                                 return (0);
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 ((flags & FNM_LEADING_DIR) ||
97                                             strchr(string, '/') == NULL ?
98                                             0 : FNM_NOMATCH);
99                                 else
100                                         return (0);
101                         else if (c == '/' && flags & FNM_PATHNAME) {
102                                 if ((string = strchr(string, '/')) == NULL)
103                                         return (FNM_NOMATCH);
104                                 break;
105                         }
106
107                         /* General case, use recursion. */
108                         while ((test = *string) != EOS) {
109                                 if (!fnmatch(pattern, string, flags & ~FNM_PERIOD))
110                                         return (0);
111                                 if (test == '/' && flags & FNM_PATHNAME)
112                                         break;
113                                 ++string;
114                         }
115                         return (FNM_NOMATCH);
116                 case '[':
117                         if (*string == EOS)
118                                 return (FNM_NOMATCH);
119                         if (*string == '/' && flags & FNM_PATHNAME)
120                                 return (FNM_NOMATCH);
121                         if ((pattern =
122                             rangematch(pattern, *string, flags)) == NULL)
123                                 return (FNM_NOMATCH);
124                         ++string;
125                         break;
126                 case '\\':
127                         if (!(flags & FNM_NOESCAPE)) {
128                                 if ((c = *pattern++) == EOS) {
129                                         c = '\\';
130                                         --pattern;
131                                 }
132                         }
133                         /* FALLTHROUGH */
134                 default:
135                         if (c == *string)
136                                 ;
137                         else if ((flags & FNM_CASEFOLD) &&
138                                  (tolower((unsigned char)c) ==
139                                   tolower((unsigned char)*string)))
140                                 ;
141                         else if ((flags & FNM_PREFIX_DIRS) && *string == EOS &&
142                              ((c == '/' && string != stringstart) ||
143                              (string == stringstart+1 && *stringstart == '/')))
144                                 return (0);
145                         else
146                                 return (FNM_NOMATCH);
147                         string++;
148                         break;
149                 }
150         /* NOTREACHED */
151 }
152
153 static const char *
154 rangematch(const char *pattern, char test, int flags)
155 {
156         int negate, ok;
157         char c, c2;
158
159         /*
160          * A bracket expression starting with an unquoted circumflex
161          * character produces unspecified results (IEEE 1003.2-1992,
162          * 3.13.2).  This implementation treats it like '!', for
163          * consistency with the regular expression syntax.
164          * J.T. Conklin (conklin@ngai.kaleida.com)
165          */
166         if ( (negate = (*pattern == '!' || *pattern == '^')) )
167                 ++pattern;
168
169         if (flags & FNM_CASEFOLD)
170                 test = tolower((unsigned char)test);
171
172         for (ok = 0; (c = *pattern++) != ']';) {
173                 if (c == '\\' && !(flags & FNM_NOESCAPE))
174                         c = *pattern++;
175                 if (c == EOS)
176                         return (NULL);
177
178                 if (flags & FNM_CASEFOLD)
179                         c = tolower((unsigned char)c);
180
181                 if (*pattern == '-'
182                     && (c2 = *(pattern+1)) != EOS && c2 != ']') {
183                         pattern += 2;
184                         if (c2 == '\\' && !(flags & FNM_NOESCAPE))
185                                 c2 = *pattern++;
186                         if (c2 == EOS)
187                                 return (NULL);
188
189                         if (flags & FNM_CASEFOLD)
190                                 c2 = tolower((unsigned char)c2);
191
192                         if ((unsigned char)c <= (unsigned char)test &&
193                             (unsigned char)test <= (unsigned char)c2)
194                                 ok = 1;
195                 } else if (c == test)
196                         ok = 1;
197         }
198         return (ok == negate ? NULL : pattern);
199 }