lib/fnmatch.c

   1 /* Copyright (C) 1991, 1992, 1993, 1996, 1997 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 ISASCII(c) 1
  44 # else
  45 #  define ISASCII(c) isascii(c)
  46 # endif
  47
  48 # define ISUPPER(c) (ISASCII (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 (c) ? tolower (c) : (c))
  65
  66   while ((c = *p++) != '\0')
  67     {
  68       c = FOLD (c);
  69
  70       switch (c)
  71         {
  72         case '?':
  73           if (*n == '\0')
  74             return FNM_NOMATCH;
  75           else if ((flags & FNM_FILE_NAME) && *n == '/')
  76             return FNM_NOMATCH;
  77           else if ((flags & FNM_PERIOD) && *n == '.' &&
  78                    (n == string || ((flags & FNM_FILE_NAME) && n[-1] == '/')))
  79             return FNM_NOMATCH;
  80           break;
  81
  82         case '\\':
  83           if (!(flags & FNM_NOESCAPE))
  84             {
  85               c = *p++;
  86               if (c == '\0')
  87                 /* Trailing \ loses.  */
  88                 return FNM_NOMATCH;
  89               c = FOLD (c);
  90             }
  91           if (FOLD (*n) != c)
  92             return FNM_NOMATCH;
  93           break;
  94
  95         case '*':
  96           if ((flags & FNM_PERIOD) && *n == '.' &&
  97               (n == string || ((flags & FNM_FILE_NAME) && n[-1] == '/')))
  98             return FNM_NOMATCH;
  99
 100           for (c = *p++; c == '?' || c == '*'; c = *p++)
 101             {
 102               if ((flags & FNM_FILE_NAME) && *n == '/')
 103                 /* A slash does not match a wildcard under FNM_FILE_NAME.  */
 104                 return FNM_NOMATCH;
 105               else if (c == '?')
 106                 {
 107                   /* A ? needs to match one character.  */
 108                   if (*n == '\0')
 109                     /* There isn't another character; no match.  */
 110                     return FNM_NOMATCH;
 111                   else
 112                     /* One character of the string is consumed in matching
 113                        this ? wildcard, so *??? won't match if there are
 114                        less than three characters.  */
 115                     ++n;
 116                 }
 117             }
 118
 119           if (c == '\0')
 120             return 0;
 121
 122           {
 123             char c1 = (!(flags & FNM_NOESCAPE) && c == '\\') ? *p : c;
 124             c1 = FOLD (c1);
 125             for (--p; *n != '\0'; ++n)
 126               if ((c == '[' || FOLD (*n) == c1) &&
 127                   fnmatch (p, n, flags & ~FNM_PERIOD) == 0)
 128                 return 0;
 129             return FNM_NOMATCH;
 130           }
 131
 132         case '[':
 133           {
 134             /* Nonzero if the sense of the character class is inverted.  */
 135             register int not;
 136
 137             if (*n == '\0')
 138               return FNM_NOMATCH;
 139
 140             if ((flags & FNM_PERIOD) && *n == '.' &&
 141                 (n == string || ((flags & FNM_FILE_NAME) && n[-1] == '/')))
 142               return FNM_NOMATCH;
 143
 144             not = (*p == '!' || *p == '^');
 145             if (not)
 146               ++p;
 147
 148             c = *p++;
 149             for (;;)
 150               {
 151                 register char cstart = c, cend = c;
 152
 153                 if (!(flags & FNM_NOESCAPE) && c == '\\')
 154                   {
 155                     if (*p == '\0')
 156                       return FNM_NOMATCH;
 157                     cstart = cend = *p++;
 158                   }
 159
 160                 cstart = cend = FOLD (cstart);
 161
 162                 if (c == '\0')
 163                   /* [ (unterminated) loses.  */
 164                   return FNM_NOMATCH;
 165
 166                 c = *p++;
 167                 c = FOLD (c);
 168
 169                 if ((flags & FNM_FILE_NAME) && c == '/')
 170                   /* [/] can never match.  */
 171                   return FNM_NOMATCH;
 172
 173                 if (c == '-' && *p != ']')
 174                   {
 175                     cend = *p++;
 176                     if (!(flags & FNM_NOESCAPE) && cend == '\\')
 177                       cend = *p++;
 178                     if (cend == '\0')
 179                       return FNM_NOMATCH;
 180                     cend = FOLD (cend);
 181
 182                     c = *p++;
 183                   }
 184
 185                 if (FOLD (*n) >= cstart && FOLD (*n) <= cend)
 186                   goto matched;
 187
 188                 if (c == ']')
 189                   break;
 190               }
 191             if (!not)
 192               return FNM_NOMATCH;
 193             break;
 194
 195           matched:;
 196             /* Skip the rest of the [...] that already matched.  */
 197             while (c != ']')
 198               {
 199                 if (c == '\0')
 200                   /* [... (unterminated) loses.  */
 201                   return FNM_NOMATCH;
 202
 203                 c = *p++;
 204                 if (!(flags & FNM_NOESCAPE) && c == '\\')
 205                   {
 206                     if (*p == '\0')
 207                       return FNM_NOMATCH;
 208                     /* XXX 1003.2d11 is unclear if this is right.  */
 209                     ++p;
 210                   }
 211               }
 212             if (not)
 213               return FNM_NOMATCH;
 214           }
 215           break;
 216
 217         default:
 218           if (c != FOLD (*n))
 219             return FNM_NOMATCH;
 220         }
 221
 222       ++n;
 223     }
 224
 225   if (*n == '\0')
 226     return 0;
 227
 228   if ((flags & FNM_LEADING_DIR) && *n == '/')
 229     /* The FNM_LEADING_DIR flag says that "foo*" matches "foobar/frobozz".  */
 230     return 0;
 231
 232   return FNM_NOMATCH;
 233
 234 # undef FOLD
 235 }
 236
 237 #endif  /* _LIBC or not __GNU_LIBRARY__.  */