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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  * Copyright (c) 2011 The FreeBSD Foundation
9  * All rights reserved.
10  * Portions of this software were developed by David Chisnall
11  * under sponsorship from the FreeBSD Foundation.
12  *
13  * Redistribution and use in source and binary forms, with or without
14  * modification, are permitted provided that the following conditions
15  * are met:
16  * 1. Redistributions of source code must retain the above copyright
17  *    notice, this list of conditions and the following disclaimer.
18  * 2. Redistributions in binary form must reproduce the above copyright
19  *    notice, this list of conditions and the following disclaimer in the
20  *    documentation and/or other materials provided with the distribution.
21  * 4. Neither the name of the University nor the names of its contributors
22  *    may be used to endorse or promote products derived from this software
23  *    without specific prior written permission.
24  *
25  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35  * SUCH DAMAGE.
36  */
37
38 #if defined(LIBC_SCCS) && !defined(lint)
39 static char sccsid[] = "@(#)fnmatch.c   8.2 (Berkeley) 4/16/94";
40 #endif /* LIBC_SCCS and not lint */
41 #include <sys/cdefs.h>
42 __FBSDID("$FreeBSD$");
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 /*
50  * Some notes on multibyte character support:
51  * 1. Patterns with illegal byte sequences match nothing.
52  * 2. Illegal byte sequences in the "string" argument are handled by treating
53  *    them as single-byte characters with a value of the first byte of the
54  *    sequence cast to wchar_t.
55  * 3. Multibyte conversion state objects (mbstate_t) are passed around and
56  *    used for most, but not all, conversions. Further work will be required
57  *    to support state-dependent encodings.
58  */
59
60 #include <fnmatch.h>
61 #include <limits.h>
62 #include <string.h>
63 #include <wchar.h>
64 #include <wctype.h>
65
66 #include "collate.h"
67
68 #define EOS     '\0'
69
70 #define RANGE_MATCH     1
71 #define RANGE_NOMATCH   0
72 #define RANGE_ERROR     (-1)
73
74 static int rangematch(const char *, wchar_t, int, char **, mbstate_t *);
75 static int fnmatch1(const char *, const char *, const char *, int, mbstate_t,
76                 mbstate_t);
77
78 int
79 fnmatch(pattern, string, flags)
80         const char *pattern, *string;
81         int flags;
82 {
83         static const mbstate_t initial;
84
85         return (fnmatch1(pattern, string, string, flags, initial, initial));
86 }
87
88 static int
89 fnmatch1(pattern, string, stringstart, flags, patmbs, strmbs)
90         const char *pattern, *string, *stringstart;
91         int flags;
92         mbstate_t patmbs, strmbs;
93 {
94         char *newp;
95         char c;
96         wchar_t pc, sc;
97         size_t pclen, sclen;
98
99         for (;;) {
100                 pclen = mbrtowc(&pc, pattern, MB_LEN_MAX, &patmbs);
101                 if (pclen == (size_t)-1 || pclen == (size_t)-2)
102                         return (FNM_NOMATCH);
103                 pattern += pclen;
104                 sclen = mbrtowc(&sc, string, MB_LEN_MAX, &strmbs);
105                 if (sclen == (size_t)-1 || sclen == (size_t)-2) {
106                         sc = (unsigned char)*string;
107                         sclen = 1;
108                         memset(&strmbs, 0, sizeof(strmbs));
109                 }
110                 switch (pc) {
111                 case EOS:
112                         if ((flags & FNM_LEADING_DIR) && sc == '/')
113                                 return (0);
114                         return (sc == EOS ? 0 : FNM_NOMATCH);
115                 case '?':
116                         if (sc == EOS)
117                                 return (FNM_NOMATCH);
118                         if (sc == '/' && (flags & FNM_PATHNAME))
119                                 return (FNM_NOMATCH);
120                         if (sc == '.' && (flags & FNM_PERIOD) &&
121                             (string == stringstart ||
122                             ((flags & FNM_PATHNAME) && *(string - 1) == '/')))
123                                 return (FNM_NOMATCH);
124                         string += sclen;
125                         break;
126                 case '*':
127                         c = *pattern;
128                         /* Collapse multiple stars. */
129                         while (c == '*')
130                                 c = *++pattern;
131
132                         if (sc == '.' && (flags & FNM_PERIOD) &&
133                             (string == stringstart ||
134                             ((flags & FNM_PATHNAME) && *(string - 1) == '/')))
135                                 return (FNM_NOMATCH);
136
137                         /* Optimize for pattern with * at end or before /. */
138                         if (c == EOS)
139                                 if (flags & FNM_PATHNAME)
140                                         return ((flags & FNM_LEADING_DIR) ||
141                                             strchr(string, '/') == NULL ?
142                                             0 : FNM_NOMATCH);
143                                 else
144                                         return (0);
145                         else if (c == '/' && flags & FNM_PATHNAME) {
146                                 if ((string = strchr(string, '/')) == NULL)
147                                         return (FNM_NOMATCH);
148                                 break;
149                         }
150
151                         /* General case, use recursion. */
152                         while (sc != EOS) {
153                                 if (!fnmatch1(pattern, string, stringstart,
154                                     flags, patmbs, strmbs))
155                                         return (0);
156                                 sclen = mbrtowc(&sc, string, MB_LEN_MAX,
157                                     &strmbs);
158                                 if (sclen == (size_t)-1 ||
159                                     sclen == (size_t)-2) {
160                                         sc = (unsigned char)*string;
161                                         sclen = 1;
162                                         memset(&strmbs, 0, sizeof(strmbs));
163                                 }
164                                 if (sc == '/' && flags & FNM_PATHNAME)
165                                         break;
166                                 string += sclen;
167                         }
168                         return (FNM_NOMATCH);
169                 case '[':
170                         if (sc == EOS)
171                                 return (FNM_NOMATCH);
172                         if (sc == '/' && (flags & FNM_PATHNAME))
173                                 return (FNM_NOMATCH);
174                         if (sc == '.' && (flags & FNM_PERIOD) &&
175                             (string == stringstart ||
176                             ((flags & FNM_PATHNAME) && *(string - 1) == '/')))
177                                 return (FNM_NOMATCH);
178
179                         switch (rangematch(pattern, sc, flags, &newp,
180                             &patmbs)) {
181                         case RANGE_ERROR:
182                                 goto norm;
183                         case RANGE_MATCH:
184                                 pattern = newp;
185                                 break;
186                         case RANGE_NOMATCH:
187                                 return (FNM_NOMATCH);
188                         }
189                         string += sclen;
190                         break;
191                 case '\\':
192                         if (!(flags & FNM_NOESCAPE)) {
193                                 pclen = mbrtowc(&pc, pattern, MB_LEN_MAX,
194                                     &patmbs);
195                                 if (pclen == (size_t)-1 || pclen == (size_t)-2)
196                                         return (FNM_NOMATCH);
197                                 if (pclen == 0)
198                                         pc = '\\';
199                                 pattern += pclen;
200                         }
201                         /* FALLTHROUGH */
202                 default:
203                 norm:
204                         if (pc == sc)
205                                 ;
206                         else if ((flags & FNM_CASEFOLD) &&
207                                  (towlower(pc) == towlower(sc)))
208                                 ;
209                         else
210                                 return (FNM_NOMATCH);
211                         string += sclen;
212                         break;
213                 }
214         }
215         /* NOTREACHED */
216 }
217
218 static int
219 rangematch(pattern, test, flags, newp, patmbs)
220         const char *pattern;
221         wchar_t test;
222         int flags;
223         char **newp;
224         mbstate_t *patmbs;
225 {
226         int negate, ok;
227         wchar_t c, c2;
228         size_t pclen;
229         const char *origpat;
230         struct xlocale_collate *table =
231                 (struct xlocale_collate*)__get_locale()->components[XLC_COLLATE];
232
233         /*
234          * A bracket expression starting with an unquoted circumflex
235          * character produces unspecified results (IEEE 1003.2-1992,
236          * 3.13.2).  This implementation treats it like '!', for
237          * consistency with the regular expression syntax.
238          * J.T. Conklin (conklin@ngai.kaleida.com)
239          */
240         if ( (negate = (*pattern == '!' || *pattern == '^')) )
241                 ++pattern;
242
243         if (flags & FNM_CASEFOLD)
244                 test = towlower(test);
245
246         /*
247          * A right bracket shall lose its special meaning and represent
248          * itself in a bracket expression if it occurs first in the list.
249          * -- POSIX.2 2.8.3.2
250          */
251         ok = 0;
252         origpat = pattern;
253         for (;;) {
254                 if (*pattern == ']' && pattern > origpat) {
255                         pattern++;
256                         break;
257                 } else if (*pattern == '\0') {
258                         return (RANGE_ERROR);
259                 } else if (*pattern == '/' && (flags & FNM_PATHNAME)) {
260                         return (RANGE_NOMATCH);
261                 } else if (*pattern == '\\' && !(flags & FNM_NOESCAPE))
262                         pattern++;
263                 pclen = mbrtowc(&c, pattern, MB_LEN_MAX, patmbs);
264                 if (pclen == (size_t)-1 || pclen == (size_t)-2)
265                         return (RANGE_NOMATCH);
266                 pattern += pclen;
267
268                 if (flags & FNM_CASEFOLD)
269                         c = towlower(c);
270
271                 if (*pattern == '-' && *(pattern + 1) != EOS &&
272                     *(pattern + 1) != ']') {
273                         if (*++pattern == '\\' && !(flags & FNM_NOESCAPE))
274                                 if (*pattern != EOS)
275                                         pattern++;
276                         pclen = mbrtowc(&c2, pattern, MB_LEN_MAX, patmbs);
277                         if (pclen == (size_t)-1 || pclen == (size_t)-2)
278                                 return (RANGE_NOMATCH);
279                         pattern += pclen;
280                         if (c2 == EOS)
281                                 return (RANGE_ERROR);
282
283                         if (flags & FNM_CASEFOLD)
284                                 c2 = towlower(c2);
285
286                         if (table->__collate_load_error ?
287                             c <= test && test <= c2 :
288                                __collate_range_cmp(table, c, test) <= 0
289                             && __collate_range_cmp(table, test, c2) <= 0
290                            )
291                                 ok = 1;
292                 } else if (c == test)
293                         ok = 1;
294         }
295
296         *newp = (char *)pattern;
297         return (ok == negate ? RANGE_NOMATCH : RANGE_MATCH);
298 }