Dogcows Code - chaz/tar/blob - lib/fnmatch.c

   1 /* Copyright 1991, 1992, 1993, 1996, 1997, 2000 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, write to the Free Software Foundation,
  15   Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  16
  17 #if HAVE_CONFIG_H
  18 # include <config.h>
  19 #endif
  20
  21 /* Enable GNU extensions in fnmatch.h.  */
  22 #ifndef _GNU_SOURCE
  23 # define _GNU_SOURCE    1
  24 #endif
  25
  26 #include <errno.h>
  27 #include <fnmatch.h>
  28 #include <ctype.h>
  29
  30
  31 /* Comment out all this code if we are using the GNU C Library, and are not
  32    actually compiling the library itself.  This code is part of the GNU C
  33    Library, but also included in many other GNU distributions.  Compiling
  34    and linking in this code is a waste when using the GNU C library
  35    (especially if it is a shared library).  Rather than having every GNU
  36    program understand `configure --with-gnu-libc' and omit the object files,
  37    it is simpler to just do this in the source for each such file.  */
  38
  39 #if defined _LIBC || !defined __GNU_LIBRARY__
  40
  41
  42 # if defined STDC_HEADERS || !defined isascii
  43 #  define IN_CTYPE_DOMAIN(c) 1
  44 # else
  45 #  define IN_CTYPE_DOMAIN(c) isascii(c)
  46 # endif
  47
  48 # define ISUPPER(c) (IN_CTYPE_DOMAIN (c) && isupper (c))
  49
  50
  51 # ifndef errno
  52 extern int errno;
  53 # endif
  54
  55 /* Match STRING against the filename pattern PATTERN, returning zero if
  56    it matches, nonzero if not.  */
  57 int
  58 fnmatch (const char *pattern, const char *string, int flags)
  59 {
  60   register const char *p = pattern, *n = string;
  61   register char c;
  62
  63 /* Note that this evaluates C many times.  */
  64 # define FOLD(c) ((flags & FNM_CASEFOLD) && ISUPPER ((unsigned char) (c)) \
  65                   ? tolower ((unsigned char) (c)) \
  66                   : (c))
  67
  68   while ((c = *p++) != '\0')
  69     {
  70       c = FOLD (c);
  71
  72       switch (c)
  73         {
  74         case '?':
  75           if (*n == '\0')
  76             return FNM_NOMATCH;
  77           else if ((flags & FNM_FILE_NAME) && *n == '/')
  78             return FNM_NOMATCH;
  79           else if ((flags & FNM_PERIOD) && *n == '.' &&
  80                    (n == string || ((flags & FNM_FILE_NAME) && n[-1] == '/')))
  81             return FNM_NOMATCH;
  82           break;
  83
  84         case '\\':
  85           if (!(flags & FNM_NOESCAPE))
  86             {
  87               c = *p++;
  88               if (c == '\0')
  89                 /* Trailing \ loses.  */
  90                 return FNM_NOMATCH;
  91               c = FOLD (c);
  92             }
  93           if (FOLD (*n) != c)
  94             return FNM_NOMATCH;
  95           break;
  96
  97         case '*':
  98           if ((flags & FNM_PERIOD) && *n == '.' &&
  99               (n == string || ((flags & FNM_FILE_NAME) && n[-1] == '/')))
 100             return FNM_NOMATCH;
 101
 102           for (c = *p++; c == '?' || c == '*'; c = *p++)
 103             {
 104               if (c == '?')
 105                 {
 106                   /* A ? needs to match one character.  */
 107                   if (*n == '\0' || (*n == '/' && (flags & FNM_FILE_NAME)))
 108                     /* There isn't another character; no match.  */
 109                     return FNM_NOMATCH;
 110                   else
 111                     /* One character of the string is consumed in matching
 112                        this ? wildcard, so *??? won't match if there are
 113                        less than three characters.  */
 114                     ++n;
 115                 }
 116             }
 117
 118           if (c == '\0')
 119             {
 120               if ((flags & (FNM_FILE_NAME | FNM_LEADING_DIR)) == FNM_FILE_NAME)
 121                 for (; *n != '\0'; n++)
 122                   if (*n == '/')
 123                     return FNM_NOMATCH;
 124               return 0;
 125             }
 126
 127           {
 128             char c1 = (!(flags & FNM_NOESCAPE) && c == '\\') ? *p : c;
 129             c1 = FOLD (c1);
 130             for (--p; *n != '\0'; ++n)
 131               if ((c == '[' || FOLD (*n) == c1) &&
 132                   fnmatch (p, n, flags & ~FNM_PERIOD) == 0)
 133                 return 0;
 134               else if (*n == '/' && (flags & FNM_FILE_NAME))
 135                 break;
 136             return FNM_NOMATCH;
 137           }
 138
 139         case '[':
 140           {
 141             /* Nonzero if the sense of the character class is inverted.  */
 142             register int not;
 143
 144             if (*n == '\0')
 145               return FNM_NOMATCH;
 146
 147             if ((flags & FNM_PERIOD) && *n == '.' &&
 148                 (n == string || ((flags & FNM_FILE_NAME) && n[-1] == '/')))
 149               return FNM_NOMATCH;
 150
 151             not = (*p == '!' || *p == '^');
 152             if (not)
 153               ++p;
 154
 155             c = *p++;
 156             for (;;)
 157               {
 158                 register char cstart = c, cend = c;
 159
 160                 if (!(flags & FNM_NOESCAPE) && c == '\\')
 161                   {
 162                     if (*p == '\0')
 163                       return FNM_NOMATCH;
 164                     cstart = cend = *p++;
 165                   }
 166
 167                 cstart = cend = FOLD (cstart);
 168
 169                 if (c == '\0')
 170                   /* [ (unterminated) loses.  */
 171                   return FNM_NOMATCH;
 172
 173                 c = *p++;
 174                 c = FOLD (c);
 175
 176                 if ((flags & FNM_FILE_NAME) && c == '/')
 177                   /* [/] can never match.  */
 178                   return FNM_NOMATCH;
 179
 180                 if (c == '-' && *p != ']')
 181                   {
 182                     cend = *p++;
 183                     if (!(flags & FNM_NOESCAPE) && cend == '\\')
 184                       cend = *p++;
 185                     if (cend == '\0')
 186                       return FNM_NOMATCH;
 187                     cend = FOLD (cend);
 188
 189                     c = *p++;
 190                   }
 191
 192                 if (FOLD (*n) >= cstart && FOLD (*n) <= cend)
 193                   goto matched;
 194
 195                 if (c == ']')
 196                   break;
 197               }
 198             if (!not)
 199               return FNM_NOMATCH;
 200             break;
 201
 202           matched:;
 203             /* Skip the rest of the [...] that already matched.  */
 204             while (c != ']')
 205               {
 206                 if (c == '\0')
 207                   /* [... (unterminated) loses.  */
 208                   return FNM_NOMATCH;
 209
 210                 c = *p++;
 211                 if (!(flags & FNM_NOESCAPE) && c == '\\')
 212                   {
 213                     if (*p == '\0')
 214                       return FNM_NOMATCH;
 215                     /* XXX 1003.2d11 is unclear if this is right.  */
 216                     ++p;
 217                   }
 218               }
 219             if (not)
 220               return FNM_NOMATCH;
 221           }
 222           break;
 223
 224         default:
 225           if (c != FOLD (*n))
 226             return FNM_NOMATCH;
 227         }
 228
 229       ++n;
 230     }
 231
 232   if (*n == '\0')
 233     return 0;
 234
 235   if ((flags & FNM_LEADING_DIR) && *n == '/')
 236     /* The FNM_LEADING_DIR flag says that "foo*" matches "foobar/frobozz".  */
 237     return 0;
 238
 239   return FNM_NOMATCH;
 240
 241 # undef FOLD
 242 }
 243
 244 #endif  /* _LIBC or not __GNU_LIBRARY__.  */