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#include <wchar.h>
35#include <wctype.h>
36#include <stddef.h>
37#include <stdbool.h>
38
39/* We need some of the locale data (the collation sequence information)
40 but there is no interface to get this information in general. Therefore
41 we support a correct implementation only in glibc. */
42#ifdef _LIBC
43# include "../locale/localeinfo.h"
44# include "../locale/coll-lookup.h"
45# include <shlib-compat.h>
46
47# define CONCAT(a,b) __CONCAT(a,b)
48# define btowc __btowc
49# define iswctype __iswctype
50# define mbsrtowcs __mbsrtowcs
51# define mempcpy __mempcpy
52# define strnlen __strnlen
53# define towlower __towlower
54# define wcscat __wcscat
55# define wcslen __wcslen
56# define wctype __wctype
57# define wmemchr __wmemchr
58# define wmempcpy __wmempcpy
59# define fnmatch __fnmatch
60extern int fnmatch (const char *pattern, const char *string, int flags);
61#endif
62
63#ifdef _LIBC
64# if __GNUC__ >= 7
65# define FALLTHROUGH __attribute__ ((__fallthrough__))
66# else
67# define FALLTHROUGH ((void) 0)
68# endif
69#else
70# include "attribute.h"
71#endif
72
73#include <intprops.h>
74#include <flexmember.h>
75#include <scratch_buffer.h>
76
77#ifdef _LIBC
78typedef ptrdiff_t idx_t;
79#else
80# include "idx.h"
81#endif
82
83/* We often have to test for FNM_FILE_NAME and FNM_PERIOD being both set. */
84#define NO_LEADING_PERIOD(flags) \
85 ((flags & (FNM_FILE_NAME | FNM_PERIOD)) == (FNM_FILE_NAME | FNM_PERIOD))
86
87/* Provide support for user-defined character classes, based on the functions
88 from ISO C 90 amendment 1. */
89#ifdef CHARCLASS_NAME_MAX
90# define CHAR_CLASS_MAX_LENGTH CHARCLASS_NAME_MAX
91#else
92/* This shouldn't happen but some implementation might still have this
93 problem. Use a reasonable default value. */
94# define CHAR_CLASS_MAX_LENGTH 256
95#endif
96
97#define IS_CHAR_CLASS(string) wctype (string)
98
99/* Avoid depending on library functions or files
100 whose names are inconsistent. */
101
102/* Global variable. */
103static int posixly_correct;
104
105/* Note that this evaluates C many times. */
106#define FOLD(c) ((flags & FNM_CASEFOLD) ? tolower (c) : (c))
107#define CHAR char
108#define UCHAR unsigned char
109#define INT int
110#define FCT internal_fnmatch
111#define EXT ext_match
112#define END end_pattern
113#define STRUCT fnmatch_struct
114#define L_(CS) CS
115#define BTOWC(C) btowc (C)
116#define STRLEN(S) strlen (S)
117#define STRCAT(D, S) strcat (D, S)
118#define MEMPCPY(D, S, N) mempcpy (D, S, N)
119#define MEMCHR(S, C, N) memchr (S, C, N)
120#define WIDE_CHAR_VERSION 0
121#ifdef _LIBC
122# include <locale/weight.h>
123# define FINDIDX findidx
124#endif
125#include "fnmatch_loop.c"
126
127
128#define FOLD(c) ((flags & FNM_CASEFOLD) ? towlower (c) : (c))
129#define CHAR wchar_t
130#define UCHAR wint_t
131#define INT wint_t
132#define FCT internal_fnwmatch
133#define EXT ext_wmatch
134#define END end_wpattern
135#define L_(CS) L##CS
136#define BTOWC(C) (C)
137#define STRLEN(S) wcslen (S)
138#define STRCAT(D, S) wcscat (D, S)
139#define MEMPCPY(D, S, N) wmempcpy (D, S, N)
140#define MEMCHR(S, C, N) wmemchr (S, C, N)
141#define WIDE_CHAR_VERSION 1
142#ifdef _LIBC
143/* Change the name the header defines so it doesn't conflict with
144 the <locale/weight.h> version included above. */
145# define findidx findidxwc
146# include <locale/weightwc.h>
147# undef findidx
148# define FINDIDX findidxwc
149#endif
150
151#undef IS_CHAR_CLASS
152/* We have to convert the wide character string in a multibyte string. But
153 we know that the character class names consist of alphanumeric characters
154 from the portable character set, and since the wide character encoding
155 for a member of the portable character set is the same code point as
156 its single-byte encoding, we can use a simplified method to convert the
157 string to a multibyte character string. */
158static wctype_t
159is_char_class (const wchar_t *wcs)
160{
161 char s[CHAR_CLASS_MAX_LENGTH + 1];
162 char *cp = s;
163
164 do
165 {
166 /* Test for a printable character from the portable character set. */
167#ifdef _LIBC
168 if (*wcs < 0x20 || *wcs > 0x7e
169 || *wcs == 0x24 || *wcs == 0x40 || *wcs == 0x60)
170 return (wctype_t) 0;
171#else
172 switch (*wcs)
173 {
174 case L' ': case L'!': case L'"': case L'#': case L'%':
175 case L'&': case L'\'': case L'(': case L')': case L'*':
176 case L'+': case L',': case L'-': case L'.': case L'/':
177 case L'0': case L'1': case L'2': case L'3': case L'4':
178 case L'5': case L'6': case L'7': case L'8': case L'9':
179 case L':': case L';': case L'<': case L'=': case L'>':
180 case L'?':
181 case L'A': case L'B': case L'C': case L'D': case L'E':
182 case L'F': case L'G': case L'H': case L'I': case L'J':
183 case L'K': case L'L': case L'M': case L'N': case L'O':
184 case L'P': case L'Q': case L'R': case L'S': case L'T':
185 case L'U': case L'V': case L'W': case L'X': case L'Y':
186 case L'Z':
187 case L'[': case L'\\': case L']': case L'^': case L'_':
188 case L'a': case L'b': case L'c': case L'd': case L'e':
189 case L'f': case L'g': case L'h': case L'i': case L'j':
190 case L'k': case L'l': case L'm': case L'n': case L'o':
191 case L'p': case L'q': case L'r': case L's': case L't':
192 case L'u': case L'v': case L'w': case L'x': case L'y':
193 case L'z': case L'{': case L'|': case L'}': case L'~':
194 break;
195 default:
196 return (wctype_t) 0;
197 }
198#endif
199
200 /* Avoid overrunning the buffer. */
201 if (cp == s + CHAR_CLASS_MAX_LENGTH)
202 return (wctype_t) 0;
203
204 *cp++ = (char) *wcs++;
205 }
206 while (*wcs != L'\0');
207
208 *cp = '\0';
209
210 return wctype (s);
211}
212#define IS_CHAR_CLASS(string) is_char_class (string)
213
214#include "fnmatch_loop.c"
215
216static int
217fnmatch_convert_to_wide (const char *str, struct scratch_buffer *buf,
218 size_t *n)
219{
220 mbstate_t ps;
221 memset (&ps, '\0', sizeof (ps));
222
223 size_t nw = buf->length / sizeof (wchar_t);
224 *n = strnlen (str, nw - 1);
225 if (__glibc_likely (*n < nw))
226 {
227 const char *p = str;
228 *n = mbsrtowcs (buf->data, &p, *n + 1, &ps);
229 if (__glibc_unlikely (*n == (size_t) -1))
230 /* Something wrong.
231 XXX Do we have to set 'errno' to something which mbsrtows hasn't
232 already done? */
233 return -1;
234 if (p == NULL)
235 return 0;
236 memset (&ps, '\0', sizeof (ps));
237 }
238
239 *n = mbsrtowcs (NULL, &str, 0, &ps);
240 if (__glibc_unlikely (*n == (size_t) -1))
241 return -1;
242 if (!scratch_buffer_set_array_size (buf, *n + 1, sizeof (wchar_t)))
243 {
244 __set_errno (ENOMEM);
245 return -2;
246 }
247 assert (mbsinit (&ps));
248 mbsrtowcs (buf->data, &str, *n + 1, &ps);
249 return 0;
250}
251
252int
253fnmatch (const char *pattern, const char *string, int flags)
254{
255 if (__glibc_unlikely (MB_CUR_MAX != 1))
256 {
257 size_t n;
258 struct scratch_buffer wpattern;
259 scratch_buffer_init (&wpattern);
260 struct scratch_buffer wstring;
261 scratch_buffer_init (&wstring);
262 int r;
263
264 /* Convert the strings into wide characters. Any conversion issue
265 fallback to the ascii version. */
266 r = fnmatch_convert_to_wide (pattern, &wpattern, &n);
267 if (r == 0)
268 {
269 r = fnmatch_convert_to_wide (string, &wstring, &n);
270 if (r == 0)
271 r = internal_fnwmatch (wpattern.data, wstring.data,
272 (wchar_t *) wstring.data + n,
273 flags & FNM_PERIOD, flags, NULL);
274 }
275
276 scratch_buffer_free (&wstring);
277 scratch_buffer_free (&wpattern);
278
279 if (r == -2 || r == 0)
280 return r;
281 }
282
283 return internal_fnmatch (pattern, string, string + strlen (string),
284 flags & FNM_PERIOD, flags, NULL);
285}
286
287#undef fnmatch
288versioned_symbol (libc, __fnmatch, fnmatch, GLIBC_2_2_3);
289#if SHLIB_COMPAT(libc, GLIBC_2_0, GLIBC_2_2_3)
290strong_alias (__fnmatch, __fnmatch_old)
291compat_symbol (libc, __fnmatch_old, fnmatch, GLIBC_2_0);
292#endif
293libc_hidden_ver (__fnmatch, fnmatch)
294