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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 #if defined(LIBC_SCCS) && !defined(lint)
34 static char sccsid[] = "@(#)fnmatch.c   8.2 (Berkeley) 4/16/94";
35 #endif /* LIBC_SCCS and not lint */
36 #include <sys/cdefs.h>
37 __FBSDID("$FreeBSD$");
38
39 /*
40  * Function fnmatch() as specified in POSIX 1003.2-1992, section B.6.
41  * Compares a filename or pathname to a pattern.
42  */
43
44 /*
45  * Some notes on multibyte character support:
46  * 1. Patterns with illegal byte sequences match nothing.
47  * 2. Illegal byte sequences in the "string" argument are handled by treating
48  *    them as single-byte characters with a value of the first byte of the
49  *    sequence cast to wchar_t.
50  * 3. Multibyte conversion state objects (mbstate_t) are passed around and
51  *    used for most, but not all, conversions. Further work will be required
52  *    to support state-dependent encodings.
53  */
54
55 #include <fnmatch.h>
56 #include <limits.h>
57 #include <string.h>
58 #include <wchar.h>
59 #include <wctype.h>
60
61 #include "collate.h"
62
63 #define EOS     '\0'
64
65 #define RANGE_MATCH     1
66 #define RANGE_NOMATCH   0
67 #define RANGE_ERROR     (-1)
68
69 static int rangematch(const char *, wchar_t, int, char **, mbstate_t *);
70 static int fnmatch1(const char *, const char *, const char *, int, mbstate_t,
71                 mbstate_t);
72
73 int
74 fnmatch(pattern, string, flags)
75         const char *pattern, *string;
76         int flags;
77 {
78         static const mbstate_t initial;
79
80         return (fnmatch1(pattern, string, string, flags, initial, initial));
81 }
82
83 static int
84 fnmatch1(pattern, string, stringstart, flags, patmbs, strmbs)
85         const char *pattern, *string, *stringstart;
86         int flags;
87         mbstate_t patmbs, strmbs;
88 {
89         char *newp;
90         char c;
91         wchar_t pc, sc;
92         size_t pclen, sclen;
93
94         for (;;) {
95                 pclen = mbrtowc(&pc, pattern, MB_LEN_MAX, &patmbs);
96                 if (pclen == (size_t)-1 || pclen == (size_t)-2)
97                         return (FNM_NOMATCH);
98                 pattern += pclen;
99                 sclen = mbrtowc(&sc, string, MB_LEN_MAX, &strmbs);
100                 if (sclen == (size_t)-1 || sclen == (size_t)-2) {
101                         sc = (unsigned char)*string;
102                         sclen = 1;
103                         memset(&strmbs, 0, sizeof(strmbs));
104                 }
105                 switch (pc) {
106                 case EOS:
107                         if ((flags & FNM_LEADING_DIR) && sc == '/')
108                                 return (0);
109                         return (sc == EOS ? 0 : FNM_NOMATCH);
110                 case '?':
111                         if (sc == EOS)
112                                 return (FNM_NOMATCH);
113                         if (sc == '/' && (flags & FNM_PATHNAME))
114                                 return (FNM_NOMATCH);
115                         if (sc == '.' && (flags & FNM_PERIOD) &&
116                             (string == stringstart ||
117                             ((flags & FNM_PATHNAME) && *(string - 1) == '/')))
118                                 return (FNM_NOMATCH);
119                         string += sclen;
120                         break;
121                 case '*':
122                         c = *pattern;
123                         /* Collapse multiple stars. */
124                         while (c == '*')
125                                 c = *++pattern;
126
127                         if (sc == '.' && (flags & FNM_PERIOD) &&
128                             (string == stringstart ||
129                             ((flags & FNM_PATHNAME) && *(string - 1) == '/')))
130                                 return (FNM_NOMATCH);
131
132                         /* Optimize for pattern with * at end or before /. */
133                         if (c == EOS)
134                                 if (flags & FNM_PATHNAME)
135                                         return ((flags & FNM_LEADING_DIR) ||
136                                             strchr(string, '/') == NULL ?
137                                             0 : FNM_NOMATCH);
138                                 else
139                                         return (0);
140                         else if (c == '/' && flags & FNM_PATHNAME) {
141                                 if ((string = strchr(string, '/')) == NULL)
142                                         return (FNM_NOMATCH);
143                                 break;
144                         }
145
146                         /* General case, use recursion. */
147                         while (sc != EOS) {
148                                 if (!fnmatch1(pattern, string, stringstart,
149                                     flags, patmbs, strmbs))
150                                         return (0);
151                                 sclen = mbrtowc(&sc, string, MB_LEN_MAX,
152                                     &strmbs);
153                                 if (sclen == (size_t)-1 ||
154                                     sclen == (size_t)-2) {
155                                         sc = (unsigned char)*string;
156                                         sclen = 1;
157                                         memset(&strmbs, 0, sizeof(strmbs));
158                                 }
159                                 if (sc == '/' && flags & FNM_PATHNAME)
160                                         break;
161                                 string += sclen;
162                         }
163                         return (FNM_NOMATCH);
164                 case '[':
165                         if (sc == EOS)
166                                 return (FNM_NOMATCH);
167                         if (sc == '/' && (flags & FNM_PATHNAME))
168                                 return (FNM_NOMATCH);
169                         if (sc == '.' && (flags & FNM_PERIOD) &&
170                             (string == stringstart ||
171                             ((flags & FNM_PATHNAME) && *(string - 1) == '/')))
172                                 return (FNM_NOMATCH);
173
174                         switch (rangematch(pattern, sc, flags, &newp,
175                             &patmbs)) {
176                         case RANGE_ERROR:
177                                 goto norm;
178                         case RANGE_MATCH:
179                                 pattern = newp;
180                                 break;
181                         case RANGE_NOMATCH:
182                                 return (FNM_NOMATCH);
183                         }
184                         string += sclen;
185                         break;
186                 case '\\':
187                         if (!(flags & FNM_NOESCAPE)) {
188                                 pclen = mbrtowc(&pc, pattern, MB_LEN_MAX,
189                                     &patmbs);
190                                 if (pclen == (size_t)-1 || pclen == (size_t)-2)
191                                         return (FNM_NOMATCH);
192                                 if (pclen == 0)
193                                         pc = '\\';
194                                 pattern += pclen;
195                         }
196                         /* FALLTHROUGH */
197                 default:
198                 norm:
199                         if (pc == sc)
200                                 ;
201                         else if ((flags & FNM_CASEFOLD) &&
202                                  (towlower(pc) == towlower(sc)))
203                                 ;
204                         else
205                                 return (FNM_NOMATCH);
206                         string += sclen;
207                         break;
208                 }
209         }
210         /* NOTREACHED */
211 }
212
213 static int
214 rangematch(pattern, test, flags, newp, patmbs)
215         const char *pattern;
216         wchar_t test;
217         int flags;
218         char **newp;
219         mbstate_t *patmbs;
220 {
221         int negate, ok;
222         wchar_t c, c2;
223         size_t pclen;
224         const char *origpat;
225
226         /*
227          * A bracket expression starting with an unquoted circumflex
228          * character produces unspecified results (IEEE 1003.2-1992,
229          * 3.13.2).  This implementation treats it like '!', for
230          * consistency with the regular expression syntax.
231          * J.T. Conklin (conklin@ngai.kaleida.com)
232          */
233         if ( (negate = (*pattern == '!' || *pattern == '^')) )
234                 ++pattern;
235
236         if (flags & FNM_CASEFOLD)
237                 test = towlower(test);
238
239         /*
240          * A right bracket shall lose its special meaning and represent
241          * itself in a bracket expression if it occurs first in the list.
242          * -- POSIX.2 2.8.3.2
243          */
244         ok = 0;
245         origpat = pattern;
246         for (;;) {
247                 if (*pattern == ']' && pattern > origpat) {
248                         pattern++;
249                         break;
250                 } else if (*pattern == '\0') {
251                         return (RANGE_ERROR);
252                 } else if (*pattern == '/' && (flags & FNM_PATHNAME)) {
253                         return (RANGE_NOMATCH);
254                 } else if (*pattern == '\\' && !(flags & FNM_NOESCAPE))
255                         pattern++;
256                 pclen = mbrtowc(&c, pattern, MB_LEN_MAX, patmbs);
257                 if (pclen == (size_t)-1 || pclen == (size_t)-2)
258                         return (RANGE_NOMATCH);
259                 pattern += pclen;
260
261                 if (flags & FNM_CASEFOLD)
262                         c = towlower(c);
263
264                 if (*pattern == '-' && *(pattern + 1) != EOS &&
265                     *(pattern + 1) != ']') {
266                         if (*++pattern == '\\' && !(flags & FNM_NOESCAPE))
267                                 if (*pattern != EOS)
268                                         pattern++;
269                         pclen = mbrtowc(&c2, pattern, MB_LEN_MAX, patmbs);
270                         if (pclen == (size_t)-1 || pclen == (size_t)-2)
271                                 return (RANGE_NOMATCH);
272                         pattern += pclen;
273                         if (c2 == EOS)
274                                 return (RANGE_ERROR);
275
276                         if (flags & FNM_CASEFOLD)
277                                 c2 = towlower(c2);
278
279                         if (__collate_load_error ?
280                             c <= test && test <= c2 :
281                                __collate_range_cmp(c, test) <= 0
282                             && __collate_range_cmp(test, c2) <= 0
283                            )
284                                 ok = 1;
285                 } else if (c == test)
286                         ok = 1;
287         }
288
289         *newp = (char *)pattern;
290         return (ok == negate ? RANGE_NOMATCH : RANGE_MATCH);
291 }