1 /* Copyright (C) 1991-2022 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
8
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <https://www.gnu.org/licenses/>. */
17
18 #ifndef _LIBC
19 # include <libc-config.h>
20 #endif
21
22 /* Enable GNU extensions in fnmatch.h. */
23 #ifndef _GNU_SOURCE
24 # define _GNU_SOURCE 1
25 #endif
26
27 #include <fnmatch.h>
28
29 #include <assert.h>
30 #include <errno.h>
31 #include <ctype.h>
32 #include <string.h>
33 #include <stdlib.h>
34 #if defined _LIBC || HAVE_ALLOCA
35 # include <alloca.h>
36 #endif
37 #include <wchar.h>
38 #include <wctype.h>
39 #include <stddef.h>
40 #include <stdbool.h>
41
42 /* We need some of the locale data (the collation sequence information)
43 but there is no interface to get this information in general. Therefore
44 we support a correct implementation only in glibc. */
45 #ifdef _LIBC
46 # include "../locale/localeinfo.h"
47 # include "../locale/coll-lookup.h"
48 # include <shlib-compat.h>
49
50 # define CONCAT(a,b) __CONCAT(a,b)
51 # define btowc __btowc
52 # define iswctype __iswctype
53 # define mbsrtowcs __mbsrtowcs
54 # define mempcpy __mempcpy
55 # define strnlen __strnlen
56 # define towlower __towlower
57 # define wcscat __wcscat
58 # define wcslen __wcslen
59 # define wctype __wctype
60 # define wmemchr __wmemchr
61 # define wmempcpy __wmempcpy
62 # define fnmatch __fnmatch
63 extern int fnmatch (const char *pattern, const char *string, int flags);
64 #endif
65
66 #ifdef _LIBC
67 # if __GNUC__ >= 7
68 # define FALLTHROUGH __attribute__ ((__fallthrough__))
69 # else
70 # define FALLTHROUGH ((void) 0)
71 # endif
72 #else
73 # include "attribute.h"
74 #endif
75
76 #include <intprops.h>
77 #include <flexmember.h>
78
79 #ifdef _LIBC
80 typedef ptrdiff_t idx_t;
81 #else
82 # include "idx.h"
83 #endif
84
85 /* We often have to test for FNM_FILE_NAME and FNM_PERIOD being both set. */
86 #define NO_LEADING_PERIOD(flags) \
87 ((flags & (FNM_FILE_NAME | FNM_PERIOD)) == (FNM_FILE_NAME | FNM_PERIOD))
88
89 #ifndef _LIBC
90 # if HAVE_ALLOCA
91 /* The OS usually guarantees only one guard page at the bottom of the stack,
92 and a page size can be as small as 4096 bytes. So we cannot safely
93 allocate anything larger than 4096 bytes. Also care for the possibility
94 of a few compiler-allocated temporary stack slots. */
95 # define __libc_use_alloca(n) ((n) < 4032)
96 # else
97 /* Just use malloc. */
98 # define __libc_use_alloca(n) false
99 # undef alloca
100 # define alloca(n) malloc (n)
101 # endif
102 # define alloca_account(size, avar) ((avar) += (size), alloca (size))
103 #endif
104
105 /* Provide support for user-defined character classes, based on the functions
106 from ISO C 90 amendment 1. */
107 #ifdef CHARCLASS_NAME_MAX
108 # define CHAR_CLASS_MAX_LENGTH CHARCLASS_NAME_MAX
109 #else
110 /* This shouldn't happen but some implementation might still have this
111 problem. Use a reasonable default value. */
112 # define CHAR_CLASS_MAX_LENGTH 256
113 #endif
114
115 #define IS_CHAR_CLASS(string) wctype (string)
116
117 /* Avoid depending on library functions or files
118 whose names are inconsistent. */
119
120 /* Global variable. */
121 static int posixly_correct;
122
123 /* Note that this evaluates C many times. */
124 #define FOLD(c) ((flags & FNM_CASEFOLD) ? tolower (c) : (c))
125 #define CHAR char
126 #define UCHAR unsigned char
127 #define INT int
128 #define FCT internal_fnmatch
129 #define EXT ext_match
130 #define END end_pattern
131 #define STRUCT fnmatch_struct
132 #define L_(CS) CS
133 #define BTOWC(C) btowc (C)
134 #define STRLEN(S) strlen (S)
135 #define STRCAT(D, S) strcat (D, S)
136 #define MEMPCPY(D, S, N) mempcpy (D, S, N)
137 #define MEMCHR(S, C, N) memchr (S, C, N)
138 #define WIDE_CHAR_VERSION 0
139 #ifdef _LIBC
140 # include <locale/weight.h>
141 # define FINDIDX findidx
142 #endif
143 #include "fnmatch_loop.c"
144
145
146 #define FOLD(c) ((flags & FNM_CASEFOLD) ? towlower (c) : (c))
147 #define CHAR wchar_t
148 #define UCHAR wint_t
149 #define INT wint_t
150 #define FCT internal_fnwmatch
151 #define EXT ext_wmatch
152 #define END end_wpattern
153 #define L_(CS) L##CS
154 #define BTOWC(C) (C)
155 #define STRLEN(S) wcslen (S)
156 #define STRCAT(D, S) wcscat (D, S)
157 #define MEMPCPY(D, S, N) wmempcpy (D, S, N)
158 #define MEMCHR(S, C, N) wmemchr (S, C, N)
159 #define WIDE_CHAR_VERSION 1
160 #ifdef _LIBC
161 /* Change the name the header defines so it doesn't conflict with
162 the <locale/weight.h> version included above. */
163 # define findidx findidxwc
164 # include <locale/weightwc.h>
165 # undef findidx
166 # define FINDIDX findidxwc
167 #endif
168
169 #undef IS_CHAR_CLASS
170 /* We have to convert the wide character string in a multibyte string. But
171 we know that the character class names consist of alphanumeric characters
172 from the portable character set, and since the wide character encoding
173 for a member of the portable character set is the same code point as
174 its single-byte encoding, we can use a simplified method to convert the
175 string to a multibyte character string. */
176 static wctype_t
177 is_char_class (const wchar_t *wcs)
178 {
179 char s[CHAR_CLASS_MAX_LENGTH + 1];
180 char *cp = s;
181
182 do
183 {
184 /* Test for a printable character from the portable character set. */
185 #ifdef _LIBC
186 if (*wcs < 0x20 || *wcs > 0x7e
187 || *wcs == 0x24 || *wcs == 0x40 || *wcs == 0x60)
188 return (wctype_t) 0;
189 #else
190 switch (*wcs)
191 {
192 case L' ': case L'!': case L'"': case L'#': case L'%':
193 case L'&': case L'\'': case L'(': case L')': case L'*':
194 case L'+': case L',': case L'-': case L'.': case L'/':
195 case L'0': case L'1': case L'2': case L'3': case L'4':
196 case L'5': case L'6': case L'7': case L'8': case L'9':
197 case L':': case L';': case L'<': case L'=': case L'>':
198 case L'?':
199 case L'A': case L'B': case L'C': case L'D': case L'E':
200 case L'F': case L'G': case L'H': case L'I': case L'J':
201 case L'K': case L'L': case L'M': case L'N': case L'O':
202 case L'P': case L'Q': case L'R': case L'S': case L'T':
203 case L'U': case L'V': case L'W': case L'X': case L'Y':
204 case L'Z':
205 case L'[': case L'\\': case L']': case L'^': case L'_':
206 case L'a': case L'b': case L'c': case L'd': case L'e':
207 case L'f': case L'g': case L'h': case L'i': case L'j':
208 case L'k': case L'l': case L'm': case L'n': case L'o':
209 case L'p': case L'q': case L'r': case L's': case L't':
210 case L'u': case L'v': case L'w': case L'x': case L'y':
211 case L'z': case L'{': case L'|': case L'}': case L'~':
212 break;
213 default:
214 return (wctype_t) 0;
215 }
216 #endif
217
218 /* Avoid overrunning the buffer. */
219 if (cp == s + CHAR_CLASS_MAX_LENGTH)
220 return (wctype_t) 0;
221
222 *cp++ = (char) *wcs++;
223 }
224 while (*wcs != L'\0');
225
226 *cp = '\0';
227
228 return wctype (s);
229 }
230 #define IS_CHAR_CLASS(string) is_char_class (string)
231
232 #include "fnmatch_loop.c"
233
234
235 int
236 fnmatch (const char *pattern, const char *string, int flags)
237 {
238 if (__glibc_unlikely (MB_CUR_MAX != 1))
239 {
240 mbstate_t ps;
241 size_t n;
242 const char *p;
243 wchar_t *wpattern_malloc = NULL;
244 wchar_t *wpattern;
245 wchar_t *wstring_malloc = NULL;
246 wchar_t *wstring;
247 size_t alloca_used = 0;
248
249 /* Convert the strings into wide characters. */
250 memset (&ps, '\0', sizeof (ps));
251 p = pattern;
252 n = strnlen (pattern, 1024);
253 if (__glibc_likely (n < 1024))
254 {
255 wpattern = (wchar_t *) alloca_account ((n + 1) * sizeof (wchar_t),
256 alloca_used);
257 n = mbsrtowcs (wpattern, &p, n + 1, &ps);
258 if (__glibc_unlikely (n == (size_t) -1))
259 /* Something wrong.
260 XXX Do we have to set 'errno' to something which mbsrtows hasn't
261 already done? */
262 return -1;
263 if (p)
264 {
265 memset (&ps, '\0', sizeof (ps));
266 goto prepare_wpattern;
267 }
268 }
269 else
270 {
271 prepare_wpattern:
272 n = mbsrtowcs (NULL, &pattern, 0, &ps);
273 if (__glibc_unlikely (n == (size_t) -1))
274 /* Something wrong.
275 XXX Do we have to set 'errno' to something which mbsrtows hasn't
276 already done? */
277 return -1;
278 if (__glibc_unlikely (n >= (size_t) -1 / sizeof (wchar_t)))
279 {
280 __set_errno (ENOMEM);
281 return -2;
282 }
283 wpattern_malloc = wpattern
284 = (wchar_t *) malloc ((n + 1) * sizeof (wchar_t));
285 assert (mbsinit (&ps));
286 if (wpattern == NULL)
287 return -2;
288 (void) mbsrtowcs (wpattern, &pattern, n + 1, &ps);
289 }
290
291 assert (mbsinit (&ps));
292 n = strnlen (string, 1024);
293 p = string;
294 if (__glibc_likely (n < 1024))
295 {
296 wstring = (wchar_t *) alloca_account ((n + 1) * sizeof (wchar_t),
297 alloca_used);
298 n = mbsrtowcs (wstring, &p, n + 1, &ps);
299 if (__glibc_unlikely (n == (size_t) -1))
300 {
301 /* Something wrong.
302 XXX Do we have to set 'errno' to something which
303 mbsrtows hasn't already done? */
304 free_return:
305 free (wpattern_malloc);
306 return -1;
307 }
308 if (p)
309 {
310 memset (&ps, '\0', sizeof (ps));
311 goto prepare_wstring;
312 }
313 }
314 else
315 {
316 prepare_wstring:
317 n = mbsrtowcs (NULL, &string, 0, &ps);
318 if (__glibc_unlikely (n == (size_t) -1))
319 /* Something wrong.
320 XXX Do we have to set 'errno' to something which mbsrtows hasn't
321 already done? */
322 goto free_return;
323 if (__glibc_unlikely (n >= (size_t) -1 / sizeof (wchar_t)))
324 {
325 free (wpattern_malloc);
326 __set_errno (ENOMEM);
327 return -2;
328 }
329
330 wstring_malloc = wstring
331 = (wchar_t *) malloc ((n + 1) * sizeof (wchar_t));
332 if (wstring == NULL)
333 {
334 free (wpattern_malloc);
335 return -2;
336 }
337 assert (mbsinit (&ps));
338 (void) mbsrtowcs (wstring, &string, n + 1, &ps);
339 }
340
341 int res = internal_fnwmatch (wpattern, wstring, wstring + n,
342 flags & FNM_PERIOD, flags, NULL,
343 alloca_used);
344
345 free (wstring_malloc);
346 free (wpattern_malloc);
347
348 return res;
349 }
350
351 return internal_fnmatch (pattern, string, string + strlen (string),
352 flags & FNM_PERIOD, flags, NULL, 0);
353 }
354
355 #undef fnmatch
356 versioned_symbol (libc, __fnmatch, fnmatch, GLIBC_2_2_3);
357 #if SHLIB_COMPAT(libc, GLIBC_2_0, GLIBC_2_2_3)
358 strong_alias (__fnmatch, __fnmatch_old)
359 compat_symbol (libc, __fnmatch_old, fnmatch, GLIBC_2_0);
360 #endif
361 libc_hidden_ver (__fnmatch, fnmatch)