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
63extern 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
80typedef 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.  */
121static 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.  */
176static wctype_t
177is_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
235int
236fnmatch (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
356versioned_symbol (libc, __fnmatch, fnmatch, GLIBC_2_2_3);
357#if SHLIB_COMPAT(libc, GLIBC_2_0, GLIBC_2_2_3)
358strong_alias (__fnmatch, __fnmatch_old)
359compat_symbol (libc, __fnmatch_old, fnmatch, GLIBC_2_0);
360#endif
361libc_hidden_ver (__fnmatch, fnmatch)
362