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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  * 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("$FreeBSD$");
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
51 static int rangematch(const char *, char, int, char **);
52
53 int
54 fnmatch(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
156 static int
157 rangematch(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 }