posix/fnmatch.c

   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 <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
  60 extern 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
  78 typedef 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.  */
 103 static 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.  */
 158 static wctype_t
 159 is_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
 216 static int
 217 fnmatch_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
 252 int
 253 fnmatch (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
 288 versioned_symbol (libc, __fnmatch, fnmatch, GLIBC_2_2_3);
 289 #if SHLIB_COMPAT(libc, GLIBC_2_0, GLIBC_2_2_3)
 290 strong_alias (__fnmatch, __fnmatch_old)
 291 compat_symbol (libc, __fnmatch_old, fnmatch, GLIBC_2_0);
 292 #endif
 293 libc_hidden_ver (__fnmatch, fnmatch)