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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(pattern, string, flags)
55         const char *pattern, *string;
56         int flags;
57 {
58         const char *stringstart;
59         char *newp;
60         char c, test;
61
62         for (stringstart = string;;)
63                 switch (c = *pattern++) {
64                 case EOS:
65                         if ((flags & FNM_LEADING_DIR) && *string == '/')
66                                 return (0);
67                         return (*string == EOS ? 0 : FNM_NOMATCH);
68                 case '?':
69                         if (*string == EOS)
70                                 return (FNM_NOMATCH);
71                         if (*string == '/' && (flags & FNM_PATHNAME))
72                                 return (FNM_NOMATCH);
73                         if (*string == '.' && (flags & FNM_PERIOD) &&
74                             (string == stringstart ||
75                             ((flags & FNM_PATHNAME) && *(string - 1) == '/')))
76                                 return (FNM_NOMATCH);
77                         ++string;
78                         break;
79                 case '*':
80                         c = *pattern;
81                         /* Collapse multiple stars. */
82                         while (c == '*')
83                                 c = *++pattern;
84
85                         if (*string == '.' && (flags & FNM_PERIOD) &&
86                             (string == stringstart ||
87                             ((flags & FNM_PATHNAME) && *(string - 1) == '/')))
88                                 return (FNM_NOMATCH);
89
90                         /* Optimize for pattern with * at end or before /. */
91                         if (c == EOS)
92                                 if (flags & FNM_PATHNAME)
93                                         return ((flags & FNM_LEADING_DIR) ||
94                                             index(string, '/') == NULL ?
95                                             0 : FNM_NOMATCH);
96                                 else
97                                         return (0);
98                         else if (c == '/' && flags & FNM_PATHNAME) {
99                                 if ((string = index(string, '/')) == NULL)
100                                         return (FNM_NOMATCH);
101                                 break;
102                         }
103
104                         /* General case, use recursion. */
105                         while ((test = *string) != EOS) {
106                                 if (!fnmatch(pattern, string, flags & ~FNM_PERIOD))
107                                         return (0);
108                                 if (test == '/' && flags & FNM_PATHNAME)
109                                         break;
110                                 ++string;
111                         }
112                         return (FNM_NOMATCH);
113                 case '[':
114                         if (*string == EOS)
115                                 return (FNM_NOMATCH);
116                         if (*string == '/' && (flags & FNM_PATHNAME))
117                                 return (FNM_NOMATCH);
118                         if (*string == '.' && (flags & FNM_PERIOD) &&
119                             (string == stringstart ||
120                             ((flags & FNM_PATHNAME) && *(string - 1) == '/')))
121                                 return (FNM_NOMATCH);
122
123                         switch (rangematch(pattern, *string, flags, &newp)) {
124                         case RANGE_ERROR:
125                                 goto norm;
126                         case RANGE_MATCH:
127                                 pattern = newp;
128                                 break;
129                         case RANGE_NOMATCH:
130                                 return (FNM_NOMATCH);
131                         }
132                         ++string;
133                         break;
134                 case '\\':
135                         if (!(flags & FNM_NOESCAPE)) {
136                                 if ((c = *pattern++) == EOS) {
137                                         c = '\\';
138                                         --pattern;
139                                 }
140                         }
141                         /* FALLTHROUGH */
142                 default:
143                 norm:
144                         if (c == *string)
145                                 ;
146                         else if ((flags & FNM_CASEFOLD) &&
147                                  (tolower((unsigned char)c) ==
148                                   tolower((unsigned char)*string)))
149                                 ;
150                         else
151                                 return (FNM_NOMATCH);
152                         string++;
153                         break;
154                 }
155         /* NOTREACHED */
156 }
157
158 static int
159 rangematch(pattern, test, flags, newp)
160         const char *pattern;
161         char test;
162         int flags;
163         char **newp;
164 {
165         int negate, ok;
166         char c, c2;
167
168         /*
169          * A bracket expression starting with an unquoted circumflex
170          * character produces unspecified results (IEEE 1003.2-1992,
171          * 3.13.2).  This implementation treats it like '!', for
172          * consistency with the regular expression syntax.
173          * J.T. Conklin (conklin@ngai.kaleida.com)
174          */
175         if ( (negate = (*pattern == '!' || *pattern == '^')) )
176                 ++pattern;
177
178         if (flags & FNM_CASEFOLD)
179                 test = tolower((unsigned char)test);
180
181         /*
182          * A right bracket shall lose its special meaning and represent
183          * itself in a bracket expression if it occurs first in the list.
184          * -- POSIX.2 2.8.3.2
185          */
186         ok = 0;
187         c = *pattern++;
188         do {
189                 if (c == '\\' && !(flags & FNM_NOESCAPE))
190                         c = *pattern++;
191                 if (c == EOS)
192                         return (RANGE_ERROR);
193
194                 if (c == '/' && (flags & FNM_PATHNAME))
195                         return (RANGE_NOMATCH);
196
197                 if (flags & FNM_CASEFOLD)
198                         c = tolower((unsigned char)c);
199
200                 if (*pattern == '-'
201                     && (c2 = *(pattern+1)) != EOS && c2 != ']') {
202                         pattern += 2;
203                         if (c2 == '\\' && !(flags & FNM_NOESCAPE))
204                                 c2 = *pattern++;
205                         if (c2 == EOS)
206                                 return (RANGE_ERROR);
207
208                         if (flags & FNM_CASEFOLD)
209                                 c2 = tolower((unsigned char)c2);
210
211                         if (c <= test && test <= c2)
212                                 ok = 1;
213                 } else if (c == test)
214                         ok = 1;
215         } while ((c = *pattern++) != ']');
216
217         *newp = (char *)(uintptr_t)pattern;
218         return (ok == negate ? RANGE_NOMATCH : RANGE_MATCH);
219 }