posix/fnmatch.c

   1 /* Copyright (C) 1991, 1992, 1993, 1996 Free Software Foundation, Inc.
   2
   3 This library is free software; you can redistribute it and/or
   4 modify it under the terms of the GNU Library General Public License as
   5 published by the Free Software Foundation; either version 2 of the
   6 License, or (at your option) any later version.
   7
   8 This library 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 GNU
  11 Library General Public License for more details.
  12
  13 You should have received a copy of the GNU Library General Public
  14 License along with this library; see the file COPYING.LIB.  If
  15 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  16 Cambridge, MA 02139, USA.  */
  17
  18 #ifdef HAVE_CONFIG_H
  19 #include <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 <errno.h>
  28 #include <fnmatch.h>
  29 #include <ctype.h>
  30
  31
  32 /* Comment out all this code if we are using the GNU C Library, and are not
  33    actually compiling the library itself.  This code is part of the GNU C
  34    Library, but also included in many other GNU distributions.  Compiling
  35    and linking in this code is a waste when using the GNU C library
  36    (especially if it is a shared library).  Rather than having every GNU
  37    program understand `configure --with-gnu-libc' and omit the object files,
  38    it is simpler to just do this in the source for each such file.  */
  39
  40 #if defined (_LIBC) || !defined (__GNU_LIBRARY__)
  41
  42
  43 #ifndef errno
  44 extern int errno;
  45 #endif
  46
  47 /* Match STRING against the filename pattern PATTERN, returning zero if
  48    it matches, nonzero if not.  */
  49 int
  50 fnmatch (pattern, string, flags)
  51      const char *pattern;
  52      const char *string;
  53      int flags;
  54 {
  55   register const char *p = pattern, *n = string;
  56   register char c;
  57
  58 /* Note that this evalutes C many times.  */
  59 #define FOLD(c) ((flags & FNM_CASEFOLD) && isupper (c) ? tolower (c) : (c))
  60
  61   while ((c = *p++) != '\0')
  62     {
  63       c = FOLD (c);
  64
  65       switch (c)
  66         {
  67         case '?':
  68           if (*n == '\0')
  69             return FNM_NOMATCH;
  70           else if ((flags & FNM_FILE_NAME) && *n == '/')
  71             return FNM_NOMATCH;
  72           else if ((flags & FNM_PERIOD) && *n == '.' &&
  73                    (n == string || ((flags & FNM_FILE_NAME) && n[-1] == '/')))
  74             return FNM_NOMATCH;
  75           break;
  76
  77         case '\\':
  78           if (!(flags & FNM_NOESCAPE))
  79             {
  80               c = *p++;
  81               c = FOLD (c);
  82             }
  83           if (FOLD (*n) != c)
  84             return FNM_NOMATCH;
  85           break;
  86
  87         case '*':
  88           if ((flags & FNM_PERIOD) && *n == '.' &&
  89               (n == string || ((flags & FNM_FILE_NAME) && n[-1] == '/')))
  90             return FNM_NOMATCH;
  91
  92           for (c = *p++; c == '?' || c == '*'; c = *p++, ++n)
  93             if (((flags & FNM_FILE_NAME) && *n == '/') ||
  94                 (c == '?' && *n == '\0'))
  95               return FNM_NOMATCH;
  96
  97           if (c == '\0')
  98             return 0;
  99
 100           {
 101             char c1 = (!(flags & FNM_NOESCAPE) && c == '\\') ? *p : c;
 102             c1 = FOLD (c1);
 103             for (--p; *n != '\0'; ++n)
 104               if ((c == '[' || FOLD (*n) == c1) &&
 105                   fnmatch (p, n, flags & ~FNM_PERIOD) == 0)
 106                 return 0;
 107             return FNM_NOMATCH;
 108           }
 109
 110         case '[':
 111           {
 112             /* Nonzero if the sense of the character class is inverted.  */
 113             register int not;
 114
 115             if (*n == '\0')
 116               return FNM_NOMATCH;
 117
 118             if ((flags & FNM_PERIOD) && *n == '.' &&
 119                 (n == string || ((flags & FNM_FILE_NAME) && n[-1] == '/')))
 120               return FNM_NOMATCH;
 121
 122             not = (*p == '!' || *p == '^');
 123             if (not)
 124               ++p;
 125
 126             c = *p++;
 127             for (;;)
 128               {
 129                 register char cstart = c, cend = c;
 130
 131                 if (!(flags & FNM_NOESCAPE) && c == '\\')
 132                   cstart = cend = *p++;
 133
 134                 cstart = cend = FOLD (cstart);
 135
 136                 if (c == '\0')
 137                   /* [ (unterminated) loses.  */
 138                   return FNM_NOMATCH;
 139
 140                 c = *p++;
 141                 c = FOLD (c);
 142
 143                 if ((flags & FNM_FILE_NAME) && c == '/')
 144                   /* [/] can never match.  */
 145                   return FNM_NOMATCH;
 146
 147                 if (c == '-' && *p != ']')
 148                   {
 149                     cend = *p++;
 150                     if (!(flags & FNM_NOESCAPE) && cend == '\\')
 151                       cend = *p++;
 152                     if (cend == '\0')
 153                       return FNM_NOMATCH;
 154                     cend = FOLD (cend);
 155
 156                     c = *p++;
 157                   }
 158
 159                 if (FOLD (*n) >= cstart && FOLD (*n) <= cend)
 160                   goto matched;
 161
 162                 if (c == ']')
 163                   break;
 164               }
 165             if (!not)
 166               return FNM_NOMATCH;
 167             break;
 168
 169           matched:;
 170             /* Skip the rest of the [...] that already matched.  */
 171             while (c != ']')
 172               {
 173                 if (c == '\0')
 174                   /* [... (unterminated) loses.  */
 175                   return FNM_NOMATCH;
 176
 177                 c = *p++;
 178                 if (!(flags & FNM_NOESCAPE) && c == '\\')
 179                   /* XXX 1003.2d11 is unclear if this is right.  */
 180                   ++p;
 181               }
 182             if (not)
 183               return FNM_NOMATCH;
 184           }
 185           break;
 186
 187         default:
 188           if (c != FOLD (*n))
 189             return FNM_NOMATCH;
 190         }
 191
 192       ++n;
 193     }
 194
 195   if (*n == '\0')
 196     return 0;
 197
 198   if ((flags & FNM_LEADING_DIR) && *n == '/')
 199     /* The FNM_LEADING_DIR flag says that "foo*" matches "foobar/frobozz".  */
 200     return 0;
 201
 202   return FNM_NOMATCH;
 203 }
 204
 205 #endif  /* _LIBC or not __GNU_LIBRARY__.  */