lib/fnmatch.c

   1 /* Copyright (C) 1991-1993, 1996-2007, 2009-2019 Free Software Foundation, Inc.
   2
   3    This program is free software; you can redistribute it and/or modify
   4    it under the terms of the GNU General Public License as published by
   5    the Free Software Foundation; either version 2, or (at your option)
   6    any later version.
   7
   8    This program is distributed in the hope that it will be useful,
   9    but WITHOUT ANY WARRANTY; without even the implied warranty of
  10    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11    GNU General Public License for more details.
  12
  13    You should have received a copy of the GNU General Public License
  14    along with this program; if not, see <https://www.gnu.org/licenses/>.  */
  15
  16 #ifndef _LIBC
  17 # include <config.h>
  18 #endif
  19
  20 /* Enable GNU extensions in fnmatch.h.  */
  21 #ifndef _GNU_SOURCE
  22 # define _GNU_SOURCE    1
  23 #endif
  24
  25 #include <fnmatch.h>
  26
  27 #include <alloca.h>
  28 #include <assert.h>
  29 #include <ctype.h>
  30 #include <errno.h>
  31 #include <stddef.h>
  32 #include <stdbool.h>
  33 #include <stdlib.h>
  34 #include <string.h>
  35
  36 #define WIDE_CHAR_SUPPORT \
  37   (HAVE_WCTYPE_H && HAVE_BTOWC && HAVE_ISWCTYPE \
  38    && HAVE_WMEMCHR && (HAVE_WMEMCPY || HAVE_WMEMPCPY))
  39
  40 /* For platform which support the ISO C amendment 1 functionality we
  41    support user defined character classes.  */
  42 #if defined _LIBC || WIDE_CHAR_SUPPORT
  43 # include <wctype.h>
  44 # include <wchar.h>
  45 #endif
  46
  47 /* We need some of the locale data (the collation sequence information)
  48    but there is no interface to get this information in general.  Therefore
  49    we support a correct implementation only in glibc.  */
  50 #ifdef _LIBC
  51 # include "../locale/localeinfo.h"
  52 # include "../locale/elem-hash.h"
  53 # include "../locale/coll-lookup.h"
  54 # include <shlib-compat.h>
  55
  56 # define CONCAT(a,b) __CONCAT(a,b)
  57 # define mbsrtowcs __mbsrtowcs
  58 # define fnmatch __fnmatch
  59 extern int fnmatch (const char *pattern, const char *string, int flags);
  60 #endif
  61
  62 #ifndef SIZE_MAX
  63 # define SIZE_MAX ((size_t) -1)
  64 #endif
  65
  66 #include "flexmember.h"
  67
  68 #ifndef FALLTHROUGH
  69 # if __GNUC__ < 7
  70 #  define FALLTHROUGH ((void) 0)
  71 # else
  72 #  define FALLTHROUGH __attribute__ ((__fallthrough__))
  73 # endif
  74 #endif
  75
  76 /* We often have to test for FNM_FILE_NAME and FNM_PERIOD being both set.  */
  77 #define NO_LEADING_PERIOD(flags) \
  78   ((flags & (FNM_FILE_NAME | FNM_PERIOD)) == (FNM_FILE_NAME | FNM_PERIOD))
  79
  80 /* Comment out all this code if we are using the GNU C Library, and are not
  81    actually compiling the library itself, and have not detected a bug
  82    in the library.  This code is part of the GNU C
  83    Library, but also included in many other GNU distributions.  Compiling
  84    and linking in this code is a waste when using the GNU C library
  85    (especially if it is a shared library).  Rather than having every GNU
  86    program understand 'configure --with-gnu-libc' and omit the object files,
  87    it is simpler to just do this in the source for each such file.  */
  88
  89 #if defined _LIBC || !defined __GNU_LIBRARY__ || !HAVE_FNMATCH_GNU
  90
  91
  92 # if ! (defined isblank || (HAVE_ISBLANK && HAVE_DECL_ISBLANK))
  93 #  define isblank(c) ((c) == ' ' || (c) == '\t')
  94 # endif
  95
  96 # define STREQ(s1, s2) (strcmp (s1, s2) == 0)
  97
  98 # if defined _LIBC || WIDE_CHAR_SUPPORT
  99 /* The GNU C library provides support for user-defined character classes
 100    and the functions from ISO C amendment 1.  */
 101 #  ifdef CHARCLASS_NAME_MAX
 102 #   define CHAR_CLASS_MAX_LENGTH CHARCLASS_NAME_MAX
 103 #  else
 104 /* This shouldn't happen but some implementation might still have this
 105    problem.  Use a reasonable default value.  */
 106 #   define CHAR_CLASS_MAX_LENGTH 256
 107 #  endif
 108
 109 #  ifdef _LIBC
 110 #   define IS_CHAR_CLASS(string) __wctype (string)
 111 #  else
 112 #   define IS_CHAR_CLASS(string) wctype (string)
 113 #  endif
 114
 115 #  ifdef _LIBC
 116 #   define ISWCTYPE(WC, WT)     __iswctype (WC, WT)
 117 #  else
 118 #   define ISWCTYPE(WC, WT)     iswctype (WC, WT)
 119 #  endif
 120
 121 #  if (HAVE_MBSTATE_T && HAVE_MBSRTOWCS) || _LIBC
 122 /* In this case we are implementing the multibyte character handling.  */
 123 #   define HANDLE_MULTIBYTE     1
 124 #  endif
 125
 126 # else
 127 #  define CHAR_CLASS_MAX_LENGTH  6 /* Namely, 'xdigit'.  */
 128
 129 #  define IS_CHAR_CLASS(string)                                               \
 130    (STREQ (string, "alpha") || STREQ (string, "upper")                        \
 131     || STREQ (string, "lower") || STREQ (string, "digit")                     \
 132     || STREQ (string, "alnum") || STREQ (string, "xdigit")                    \
 133     || STREQ (string, "space") || STREQ (string, "print")                     \
 134     || STREQ (string, "punct") || STREQ (string, "graph")                     \
 135     || STREQ (string, "cntrl") || STREQ (string, "blank"))
 136 # endif
 137
 138 /* Avoid depending on library functions or files
 139    whose names are inconsistent.  */
 140
 141 /* Global variable.  */
 142 static int posixly_correct;
 143
 144 # ifndef internal_function
 145 /* Inside GNU libc we mark some function in a special way.  In other
 146    environments simply ignore the marking.  */
 147 #  define internal_function
 148 # endif
 149
 150 /* Note that this evaluates C many times.  */
 151 # define FOLD(c) ((flags & FNM_CASEFOLD) ? tolower (c) : (c))
 152 # define CHAR   char
 153 # define UCHAR  unsigned char
 154 # define INT    int
 155 # define FCT    internal_fnmatch
 156 # define EXT    ext_match
 157 # define END    end_pattern
 158 # define L_(CS) CS
 159 # ifdef _LIBC
 160 #  define BTOWC(C)      __btowc (C)
 161 # else
 162 #  define BTOWC(C)      btowc (C)
 163 # endif
 164 # define STRLEN(S) strlen (S)
 165 # define STRCAT(D, S) strcat (D, S)
 166 # ifdef _LIBC
 167 #  define MEMPCPY(D, S, N) __mempcpy (D, S, N)
 168 # else
 169 #  if HAVE_MEMPCPY
 170 #   define MEMPCPY(D, S, N) mempcpy (D, S, N)
 171 #  else
 172 #   define MEMPCPY(D, S, N) ((void *) ((char *) memcpy (D, S, N) + (N)))
 173 #  endif
 174 # endif
 175 # define MEMCHR(S, C, N) memchr (S, C, N)
 176 # include "fnmatch_loop.c"
 177
 178
 179 # if HANDLE_MULTIBYTE
 180 #  define FOLD(c) ((flags & FNM_CASEFOLD) ? towlower (c) : (c))
 181 #  define CHAR  wchar_t
 182 #  define UCHAR wint_t
 183 #  define INT   wint_t
 184 #  define FCT   internal_fnwmatch
 185 #  define EXT   ext_wmatch
 186 #  define END   end_wpattern
 187 #  define L_(CS)        L##CS
 188 #  define BTOWC(C)      (C)
 189 #  ifdef _LIBC
 190 #   define STRLEN(S) __wcslen (S)
 191 #   define STRCAT(D, S) __wcscat (D, S)
 192 #   define MEMPCPY(D, S, N) __wmempcpy (D, S, N)
 193 #  else
 194 #   define STRLEN(S) wcslen (S)
 195 #   define STRCAT(D, S) wcscat (D, S)
 196 #   if HAVE_WMEMPCPY
 197 #    define MEMPCPY(D, S, N) wmempcpy (D, S, N)
 198 #   else
 199 #    define MEMPCPY(D, S, N) (wmemcpy (D, S, N) + (N))
 200 #   endif
 201 #  endif
 202 #  define MEMCHR(S, C, N) wmemchr (S, C, N)
 203 #  define WIDE_CHAR_VERSION 1
 204
 205 #  undef IS_CHAR_CLASS
 206 /* We have to convert the wide character string in a multibyte string.  But
 207    we know that the character class names consist of alphanumeric characters
 208    from the portable character set, and since the wide character encoding
 209    for a member of the portable character set is the same code point as
 210    its single-byte encoding, we can use a simplified method to convert the
 211    string to a multibyte character string.  */
 212 static wctype_t
 213 is_char_class (const wchar_t *wcs)
 214 {
 215   char s[CHAR_CLASS_MAX_LENGTH + 1];
 216   char *cp = s;
 217
 218   do
 219     {
 220       /* Test for a printable character from the portable character set.  */
 221 #  ifdef _LIBC
 222       if (*wcs < 0x20 || *wcs > 0x7e
 223           || *wcs == 0x24 || *wcs == 0x40 || *wcs == 0x60)
 224         return (wctype_t) 0;
 225 #  else
 226       switch (*wcs)
 227         {
 228         case L' ': case L'!': case L'"': case L'#': case L'%':
 229         case L'&': case L'\'': case L'(': case L')': case L'*':
 230         case L'+': case L',': case L'-': case L'.': case L'/':
 231         case L'0': case L'1': case L'2': case L'3': case L'4':
 232         case L'5': case L'6': case L'7': case L'8': case L'9':
 233         case L':': case L';': case L'<': case L'=': case L'>':
 234         case L'?':
 235         case L'A': case L'B': case L'C': case L'D': case L'E':
 236         case L'F': case L'G': case L'H': case L'I': case L'J':
 237         case L'K': case L'L': case L'M': case L'N': case L'O':
 238         case L'P': case L'Q': case L'R': case L'S': case L'T':
 239         case L'U': case L'V': case L'W': case L'X': case L'Y':
 240         case L'Z':
 241         case L'[': case L'\\': case L']': case L'^': case L'_':
 242         case L'a': case L'b': case L'c': case L'd': case L'e':
 243         case L'f': case L'g': case L'h': case L'i': case L'j':
 244         case L'k': case L'l': case L'm': case L'n': case L'o':
 245         case L'p': case L'q': case L'r': case L's': case L't':
 246         case L'u': case L'v': case L'w': case L'x': case L'y':
 247         case L'z': case L'{': case L'|': case L'}': case L'~':
 248           break;
 249         default:
 250           return (wctype_t) 0;
 251         }
 252 #  endif
 253
 254       /* Avoid overrunning the buffer.  */
 255       if (cp == s + CHAR_CLASS_MAX_LENGTH)
 256         return (wctype_t) 0;
 257
 258       *cp++ = (char) *wcs++;
 259     }
 260   while (*wcs != L'\0');
 261
 262   *cp = '\0';
 263
 264 #  ifdef _LIBC
 265   return __wctype (s);
 266 #  else
 267   return wctype (s);
 268 #  endif
 269 }
 270 #  define IS_CHAR_CLASS(string) is_char_class (string)
 271
 272 #  include "fnmatch_loop.c"
 273 # endif
 274
 275
 276 int
 277 fnmatch (const char *pattern, const char *string, int flags)
 278 {
 279 # if HANDLE_MULTIBYTE
 280 #  define ALLOCA_LIMIT 2000
 281   if (__builtin_expect (MB_CUR_MAX, 1) != 1)
 282     {
 283       mbstate_t ps;
 284       size_t patsize;
 285       size_t strsize;
 286       size_t totsize;
 287       wchar_t *wpattern;
 288       wchar_t *wstring;
 289       int res;
 290
 291       /* Calculate the size needed to convert the strings to
 292          wide characters.  */
 293       memset (&ps, '\0', sizeof (ps));
 294       patsize = mbsrtowcs (NULL, &pattern, 0, &ps) + 1;
 295       if (__builtin_expect (patsize != 0, 1))
 296         {
 297           assert (mbsinit (&ps));
 298           strsize = mbsrtowcs (NULL, &string, 0, &ps) + 1;
 299           if (__builtin_expect (strsize != 0, 1))
 300             {
 301               assert (mbsinit (&ps));
 302               totsize = patsize + strsize;
 303               if (__builtin_expect (! (patsize <= totsize
 304                                        && totsize <= SIZE_MAX / sizeof (wchar_t)),
 305                                     0))
 306                 {
 307                   errno = ENOMEM;
 308                   return -1;
 309                 }
 310
 311               /* Allocate room for the wide characters.  */
 312               if (__builtin_expect (totsize < ALLOCA_LIMIT, 1))
 313                 wpattern = (wchar_t *) alloca (totsize * sizeof (wchar_t));
 314               else
 315                 {
 316                   wpattern = malloc (totsize * sizeof (wchar_t));
 317                   if (__builtin_expect (! wpattern, 0))
 318                     {
 319                       errno = ENOMEM;
 320                       return -1;
 321                     }
 322                 }
 323               wstring = wpattern + patsize;
 324
 325               /* Convert the strings into wide characters.  */
 326               mbsrtowcs (wpattern, &pattern, patsize, &ps);
 327               assert (mbsinit (&ps));
 328               mbsrtowcs (wstring, &string, strsize, &ps);
 329
 330               res = internal_fnwmatch (wpattern, wstring, wstring + strsize - 1,
 331                                        flags & FNM_PERIOD, flags);
 332
 333               if (__builtin_expect (! (totsize < ALLOCA_LIMIT), 0))
 334                 free (wpattern);
 335               return res;
 336             }
 337         }
 338     }
 339
 340 # endif /* HANDLE_MULTIBYTE */
 341
 342   return internal_fnmatch (pattern, string, string + strlen (string),
 343                            flags & FNM_PERIOD, flags);
 344 }
 345
 346 # ifdef _LIBC
 347 #  undef fnmatch
 348 versioned_symbol (libc, __fnmatch, fnmatch, GLIBC_2_2_3);
 349 #  if SHLIB_COMPAT(libc, GLIBC_2_0, GLIBC_2_2_3)
 350 strong_alias (__fnmatch, __fnmatch_old)
 351 compat_symbol (libc, __fnmatch_old, fnmatch, GLIBC_2_0);
 352 #  endif
 353 libc_hidden_ver (__fnmatch, fnmatch)
 354 # endif
 355
 356 #endif  /* _LIBC or not __GNU_LIBRARY__.  */