lib/fnmatch.c

   1 /* Copyright (C) 1991, 1992, 1993, 1997 Free Software Foundation, Inc.
   2
   3    NOTE: The canonical source of this file is maintained with the GNU C
   4    Library.  Bugs can be reported to bug-glibc@prep.ai.mit.edu.
   5
   6    This program is free software; you can redistribute it and/or modify it
   7    under the terms of the GNU General Public License as published by the
   8    Free Software Foundation; either version 2, or (at your option) any
   9    later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, write to the Free Software Foundation,
  18    Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  19
  20 #if HAVE_CONFIG_H
  21 # include <config.h>
  22 #endif
  23
  24 #include <errno.h>
  25 #include <fnmatch.h>
  26 #include <ctype.h>
  27
  28 #if defined (STDC_HEADERS) || !defined (isascii)
  29 # define ISASCII(c) 1
  30 #else
  31 # define ISASCII(c) isascii(c)
  32 #endif
  33
  34 #define ISUPPER(c) (ISASCII (c) && isupper (c))
  35
  36 # ifndef errno
  37 extern int errno;
  38 # endif
  39
  40 /* Match STRING against the filename pattern PATTERN, returning zero if
  41    it matches, nonzero if not.  */
  42 int
  43 fnmatch (pattern, string, flags)
  44      const char *pattern;
  45      const char *string;
  46      int flags;
  47 {
  48   register const char *p = pattern, *n = string;
  49   register char c;
  50
  51 /* Note that this evaluates C many times.  */
  52 # define FOLD(c)        ((flags & FNM_CASEFOLD) && ISUPPER (c) ? tolower (c) : (c))
  53
  54   while ((c = *p++) != '\0')
  55     {
  56       c = FOLD (c);
  57
  58       switch (c)
  59         {
  60         case '?':
  61           if (*n == '\0')
  62             return FNM_NOMATCH;
  63           else if ((flags & FNM_FILE_NAME) && *n == '/')
  64             return FNM_NOMATCH;
  65           else if ((flags & FNM_PERIOD) && *n == '.' &&
  66                    (n == string || ((flags & FNM_FILE_NAME) && n[-1] == '/')))
  67             return FNM_NOMATCH;
  68           break;
  69
  70         case '\\':
  71           if (!(flags & FNM_NOESCAPE))
  72             {
  73               c = *p++;
  74               c = FOLD (c);
  75             }
  76           if (FOLD (*n) != c)
  77             return FNM_NOMATCH;
  78           break;
  79
  80         case '*':
  81           if ((flags & FNM_PERIOD) && *n == '.' &&
  82               (n == string || ((flags & FNM_FILE_NAME) && n[-1] == '/')))
  83             return FNM_NOMATCH;
  84
  85           for (c = *p++; c == '?' || c == '*'; c = *p++, ++n)
  86             if (((flags & FNM_FILE_NAME) && *n == '/') ||
  87                 (c == '?' && *n == '\0'))
  88               return FNM_NOMATCH;
  89
  90           if (c == '\0')
  91             return 0;
  92
  93           {
  94             char c1 = (!(flags & FNM_NOESCAPE) && c == '\\') ? *p : c;
  95             c1 = FOLD (c1);
  96             for (--p; *n != '\0'; ++n)
  97               if ((c == '[' || FOLD (*n) == c1) &&
  98                   fnmatch (p, n, flags & ~FNM_PERIOD) == 0)
  99                 return 0;
 100             return FNM_NOMATCH;
 101           }
 102
 103         case '[':
 104           {
 105             /* Nonzero if the sense of the character class is inverted.  */
 106             register int not;
 107
 108             if (*n == '\0')
 109               return FNM_NOMATCH;
 110
 111             if ((flags & FNM_PERIOD) && *n == '.' &&
 112                 (n == string || ((flags & FNM_FILE_NAME) && n[-1] == '/')))
 113               return FNM_NOMATCH;
 114
 115             not = (*p == '!' || *p == '^');
 116             if (not)
 117               ++p;
 118
 119             c = *p++;
 120             for (;;)
 121               {
 122                 register char cstart = c, cend = c;
 123
 124                 if (!(flags & FNM_NOESCAPE) && c == '\\')
 125                   cstart = cend = *p++;
 126
 127                 cstart = cend = FOLD (cstart);
 128
 129                 if (c == '\0')
 130                   /* [ (unterminated) loses.  */
 131                   return FNM_NOMATCH;
 132
 133                 c = *p++;
 134                 c = FOLD (c);
 135
 136                 if ((flags & FNM_FILE_NAME) && c == '/')
 137                   /* [/] can never match.  */
 138                   return FNM_NOMATCH;
 139
 140                 if (c == '-' && *p != ']')
 141                   {
 142                     cend = *p++;
 143                     if (!(flags & FNM_NOESCAPE) && cend == '\\')
 144                       cend = *p++;
 145                     if (cend == '\0')
 146                       return FNM_NOMATCH;
 147                     cend = FOLD (cend);
 148
 149                     c = *p++;
 150                   }
 151
 152                 if (FOLD (*n) >= cstart && FOLD (*n) <= cend)
 153                   goto matched;
 154
 155                 if (c == ']')
 156                   break;
 157               }
 158             if (!not)
 159               return FNM_NOMATCH;
 160             break;
 161
 162           matched:;
 163             /* Skip the rest of the [...] that already matched.  */
 164             while (c != ']')
 165               {
 166                 if (c == '\0')
 167                   /* [... (unterminated) loses.  */
 168                   return FNM_NOMATCH;
 169
 170                 c = *p++;
 171                 if (!(flags & FNM_NOESCAPE) && c == '\\')
 172                   /* XXX 1003.2d11 is unclear if this is right.  */
 173                   ++p;
 174               }
 175             if (not)
 176               return FNM_NOMATCH;
 177           }
 178           break;
 179
 180         default:
 181           if (c != FOLD (*n))
 182             return FNM_NOMATCH;
 183         }
 184
 185       ++n;
 186     }
 187
 188   if (*n == '\0')
 189     return 0;
 190
 191   if ((flags & FNM_LEADING_DIR) && *n == '/')
 192     /* The FNM_LEADING_DIR flag says that "foo*" matches "foobar/frobozz".  */
 193     return 0;
 194
 195   return FNM_NOMATCH;
 196
 197 # undef FOLD
 198 }