1 /* Copyright (C) 1991-2023 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 <stdckdint.h>
34 #include <stdlib.h>
35 #if defined _LIBC || HAVE_ALLOCA
36 # include <alloca.h>
37 #endif
38 #include <stddef.h>
39 #include <uchar.h>
40 #if defined _LIBC || !_GL_SMALL_WCHAR_T
41 /* It's OK to use wchar_t, since it's wide enough. */
42 # include <wchar.h>
43 # include <wctype.h>
44 # define WCHAR_T wchar_t
45 # define WINT_T wint_t
46 # define BTOWC btowc
47 # define MBSRTOWCS mbsrtowcs
48 # define WCSLEN wcslen
49 # define WCSCAT wcscat
50 # define WMEMPCPY wmempcpy
51 # define WMEMCHR wmemchr
52 # define TOWLOWER towlower
53 # define WCTYPE_T wctype_t
54 # define WCTYPE wctype
55 # define ISWCTYPE iswctype
56 #else
57 /* wchar_t is too small, use char32_t instead. */
58 # include "unistr.h"
59 # define WCHAR_T char32_t
60 # define WINT_T char32_t
61 # define BTOWC btoc32
62 # define MBSRTOWCS mbsrtoc32s
63 # define WCSLEN u32_strlen
64 # define WCSCAT u32_strcat
65 # define WMEMPCPY u32_pcpy
66 # define WMEMCHR(S, C, N) u32_chr (S, N, C)
67 # define TOWLOWER c32tolower
68 # define WCTYPE_T c32_type_test_t
69 # define WCTYPE c32_get_type_test
70 # define ISWCTYPE c32_apply_type_test
71 #endif
72
73 /* We need some of the locale data (the collation sequence information)
74 but there is no interface to get this information in general. Therefore
75 we support a correct implementation only in glibc. */
76 #ifdef _LIBC
77 # include "../locale/localeinfo.h"
78 # include "../locale/coll-lookup.h"
79 # include <shlib-compat.h>
80
81 # define CONCAT(a,b) __CONCAT(a,b)
82 # define btowc __btowc
83 # define iswctype __iswctype
84 # define mbsrtowcs __mbsrtowcs
85 # define mempcpy __mempcpy
86 # define strnlen __strnlen
87 # define towlower __towlower
88 # define wcscat __wcscat
89 # define wcslen __wcslen
90 # define wctype __wctype
91 # define wmemchr __wmemchr
92 # define wmempcpy __wmempcpy
93 # define fnmatch __fnmatch
94 extern int fnmatch (const char *pattern, const char *string, int flags);
95 #endif
96
97 #ifdef _LIBC
98 # if __glibc_has_attribute (__fallthrough__)
99 # define FALLTHROUGH __attribute__ ((__fallthrough__))
100 # else
101 # define FALLTHROUGH ((void) 0)
102 # endif
103 #else
104 # include "attribute.h"
105 #endif
106
107 #include <flexmember.h>
108
109 #ifdef _LIBC
110 typedef ptrdiff_t idx_t;
111 #else
112 # include "idx.h"
113 #endif
114
115 /* We often have to test for FNM_FILE_NAME and FNM_PERIOD being both set. */
116 #define NO_LEADING_PERIOD(flags) \
117 ((flags & (FNM_FILE_NAME | FNM_PERIOD)) == (FNM_FILE_NAME | FNM_PERIOD))
118
119 #ifndef _LIBC
120 # if HAVE_ALLOCA
121 /* The OS usually guarantees only one guard page at the bottom of the stack,
122 and a page size can be as small as 4096 bytes. So we cannot safely
123 allocate anything larger than 4096 bytes. Also care for the possibility
124 of a few compiler-allocated temporary stack slots. */
125 # define __libc_use_alloca(n) ((n) < 4032)
126 # else
127 /* Just use malloc. */
128 # define __libc_use_alloca(n) false
129 # undef alloca
130 # define alloca(n) malloc (n)
131 # endif
132 # define alloca_account(size, avar) ((avar) += (size), alloca (size))
133 #endif
134
135 /* Provide support for user-defined character classes, based on the functions
136 from ISO C 90 amendment 1. */
137 #ifdef CHARCLASS_NAME_MAX
138 # define CHAR_CLASS_MAX_LENGTH CHARCLASS_NAME_MAX
139 #else
140 /* This shouldn't happen but some implementation might still have this
141 problem. Use a reasonable default value. */
142 # define CHAR_CLASS_MAX_LENGTH 256
143 #endif
144
145 #define IS_CHAR_CLASS(string) WCTYPE (string)
146
147 /* Avoid depending on library functions or files
148 whose names are inconsistent. */
149
150 /* Global variable. */
151 static int posixly_correct;
152
153 /* Note that this evaluates C many times. */
154 #define FOLD(c) ((flags & FNM_CASEFOLD) ? tolower (c) : (c))
155 #define CHAR char
156 #define UCHAR unsigned char
157 #define INT int
158 #define FCT internal_fnmatch
159 #define EXT ext_match
160 #define END end_pattern
161 #define STRUCT fnmatch_struct
162 #define L_(CS) CS
163 #define UCHAR_TO_WCHAR(C) BTOWC (C)
164 #define STRLEN(S) strlen (S)
165 #define STRCAT(D, S) strcat (D, S)
166 #define MEMPCPY(D, S, N) mempcpy (D, S, N)
167 #define MEMCHR(S, C, N) memchr (S, C, N)
168 #define WIDE_CHAR_VERSION 0
169 #ifdef _LIBC
170 # include <locale/weight.h>
171 # define FINDIDX findidx
172 #endif
173 #include "fnmatch_loop.c"
174
175
176 #define FOLD(c) ((flags & FNM_CASEFOLD) ? TOWLOWER (c) : (c))
177 #define CHAR WCHAR_T
178 #define UCHAR WINT_T
179 #define INT WINT_T
180 #define FCT internal_fnwmatch
181 #define EXT ext_wmatch
182 #define END end_wpattern
183 #define L_(CS) L##CS
184 #define UCHAR_TO_WCHAR(C) (C)
185 #define STRLEN(S) WCSLEN (S)
186 #define STRCAT(D, S) WCSCAT (D, S)
187 #define MEMPCPY(D, S, N) WMEMPCPY (D, S, N)
188 #define MEMCHR(S, C, N) WMEMCHR (S, C, N)
189 #define WIDE_CHAR_VERSION 1
190 #ifdef _LIBC
191 /* Change the name the header defines so it doesn't conflict with
192 the <locale/weight.h> version included above. */
193 # define findidx findidxwc
194 # include <locale/weightwc.h>
195 # undef findidx
196 # define FINDIDX findidxwc
197 #endif
198
199 #undef IS_CHAR_CLASS
200 /* We have to convert the wide character string in a multibyte string. But
201 we know that the character class names consist of alphanumeric characters
202 from the portable character set, and since the wide character encoding
203 for a member of the portable character set is the same code point as
204 its single-byte encoding, we can use a simplified method to convert the
205 string to a multibyte character string. */
206 static WCTYPE_T
207 is_char_class (const WCHAR_T *wcs)
208 {
209 char s[CHAR_CLASS_MAX_LENGTH + 1];
210 char *cp = s;
211
212 do
213 {
214 /* Test for a printable character from the portable character set. */
215 #ifdef _LIBC
216 if (*wcs < 0x20 || *wcs > 0x7e
217 || *wcs == 0x24 || *wcs == 0x40 || *wcs == 0x60)
218 return (WCTYPE_T) 0;
219 #else
220 switch (*wcs)
221 {
222 case L' ': case L'!': case L'"': case L'#': case L'%':
223 case L'&': case L'\'': case L'(': case L')': case L'*':
224 case L'+': case L',': case L'-': case L'.': case L'/':
225 case L'0': case L'1': case L'2': case L'3': case L'4':
226 case L'5': case L'6': case L'7': case L'8': case L'9':
227 case L':': case L';': case L'<': case L'=': case L'>':
228 case L'?':
229 case L'A': case L'B': case L'C': case L'D': case L'E':
230 case L'F': case L'G': case L'H': case L'I': case L'J':
231 case L'K': case L'L': case L'M': case L'N': case L'O':
232 case L'P': case L'Q': case L'R': case L'S': case L'T':
233 case L'U': case L'V': case L'W': case L'X': case L'Y':
234 case L'Z':
235 case L'[': case L'\\': case L']': case L'^': case L'_':
236 case L'a': case L'b': case L'c': case L'd': case L'e':
237 case L'f': case L'g': case L'h': case L'i': case L'j':
238 case L'k': case L'l': case L'm': case L'n': case L'o':
239 case L'p': case L'q': case L'r': case L's': case L't':
240 case L'u': case L'v': case L'w': case L'x': case L'y':
241 case L'z': case L'{': case L'|': case L'}': case L'~':
242 break;
243 default:
244 return (WCTYPE_T) 0;
245 }
246 #endif
247
248 /* Avoid overrunning the buffer. */
249 if (cp == s + CHAR_CLASS_MAX_LENGTH)
250 return (WCTYPE_T) 0;
251
252 *cp++ = (char) *wcs++;
253 }
254 while (*wcs != L'\0');
255
256 *cp = '\0';
257
258 return WCTYPE (s);
259 }
260 #define IS_CHAR_CLASS(string) is_char_class (string)
261
262 #include "fnmatch_loop.c"
263
264
265 int
266 fnmatch (const char *pattern, const char *string, int flags)
267 {
268 if (__glibc_unlikely (MB_CUR_MAX != 1))
269 {
270 mbstate_t ps;
271 size_t n;
272 const char *p;
273 WCHAR_T *wpattern_malloc = NULL;
274 WCHAR_T *wpattern;
275 WCHAR_T *wstring_malloc = NULL;
276 WCHAR_T *wstring;
277 size_t alloca_used = 0;
278
279 /* Convert the strings into wide characters. */
280 memset (&ps, '\0', sizeof (ps));
281 p = pattern;
282 n = strnlen (pattern, 1024);
283 if (__glibc_likely (n < 1024))
284 {
285 wpattern = (WCHAR_T *) alloca_account ((n + 1) * sizeof (WCHAR_T),
286 alloca_used);
287 n = MBSRTOWCS (wpattern, &p, n + 1, &ps);
288 if (__glibc_unlikely (n == (size_t) -1))
289 /* Something wrong.
290 XXX Do we have to set 'errno' to something which mbsrtows hasn't
291 already done? */
292 return -1;
293 if (p)
294 {
295 memset (&ps, '\0', sizeof (ps));
296 goto prepare_wpattern;
297 }
298 }
299 else
300 {
301 prepare_wpattern:
302 n = MBSRTOWCS (NULL, &pattern, 0, &ps);
303 if (__glibc_unlikely (n == (size_t) -1))
304 /* Something wrong.
305 XXX Do we have to set 'errno' to something which mbsrtows hasn't
306 already done? */
307 return -1;
308 if (__glibc_unlikely (n >= (size_t) -1 / sizeof (WCHAR_T)))
309 {
310 __set_errno (ENOMEM);
311 return -2;
312 }
313 wpattern_malloc = wpattern
314 = (WCHAR_T *) malloc ((n + 1) * sizeof (WCHAR_T));
315 assert (mbsinit (&ps));
316 if (wpattern == NULL)
317 return -2;
318 (void) MBSRTOWCS (wpattern, &pattern, n + 1, &ps);
319 }
320
321 assert (mbsinit (&ps));
322 n = strnlen (string, 1024);
323 p = string;
324 if (__glibc_likely (n < 1024))
325 {
326 wstring = (WCHAR_T *) alloca_account ((n + 1) * sizeof (WCHAR_T),
327 alloca_used);
328 n = MBSRTOWCS (wstring, &p, n + 1, &ps);
329 if (__glibc_unlikely (n == (size_t) -1))
330 {
331 /* Something wrong.
332 XXX Do we have to set 'errno' to something which
333 mbsrtows hasn't already done? */
334 free_return:
335 free (wpattern_malloc);
336 return -1;
337 }
338 if (p)
339 {
340 memset (&ps, '\0', sizeof (ps));
341 goto prepare_wstring;
342 }
343 }
344 else
345 {
346 prepare_wstring:
347 n = MBSRTOWCS (NULL, &string, 0, &ps);
348 if (__glibc_unlikely (n == (size_t) -1))
349 /* Something wrong.
350 XXX Do we have to set 'errno' to something which mbsrtows hasn't
351 already done? */
352 goto free_return;
353 if (__glibc_unlikely (n >= (size_t) -1 / sizeof (WCHAR_T)))
354 {
355 free (wpattern_malloc);
356 __set_errno (ENOMEM);
357 return -2;
358 }
359
360 wstring_malloc = wstring
361 = (WCHAR_T *) malloc ((n + 1) * sizeof (WCHAR_T));
362 if (wstring == NULL)
363 {
364 free (wpattern_malloc);
365 return -2;
366 }
367 assert (mbsinit (&ps));
368 (void) MBSRTOWCS (wstring, &string, n + 1, &ps);
369 }
370
371 int res = internal_fnwmatch (wpattern, wstring, wstring + n,
372 flags & FNM_PERIOD, flags, NULL,
373 alloca_used);
374
375 free (wstring_malloc);
376 free (wpattern_malloc);
377
378 return res;
379 }
380
381 return internal_fnmatch (pattern, string, string + strlen (string),
382 flags & FNM_PERIOD, flags, NULL, 0);
383 }
384
385 #undef fnmatch
386 versioned_symbol (libc, __fnmatch, fnmatch, GLIBC_2_2_3);
387 #if SHLIB_COMPAT(libc, GLIBC_2_0, GLIBC_2_2_3)
388 strong_alias (__fnmatch, __fnmatch_old)
389 compat_symbol (libc, __fnmatch_old, fnmatch, GLIBC_2_0);
390 #endif
391 libc_hidden_ver (__fnmatch, fnmatch)