gen/fnmatch.c

   1 /*
   2  * Copyright (c) 1989, 1993, 1994
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * This code is derived from software contributed to Berkeley by
   6  * Guido van Rossum.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. All advertising materials mentioning features or use of this software
  17  *    must display the following acknowledgement:
  18  *      This product includes software developed by the University of
  19  *      California, Berkeley and its contributors.
  20  * 4. Neither the name of the University nor the names of its contributors
  21  *    may be used to endorse or promote products derived from this software
  22  *    without specific prior written permission.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  34  * SUCH DAMAGE.
  35  */
  36
  37 #if defined(LIBC_SCCS) && !defined(lint)
  38 static char sccsid[] = "@(#)fnmatch.c   8.2 (Berkeley) 4/16/94";
  39 #endif /* LIBC_SCCS and not lint */
  40
  41 /*
  42  * Function fnmatch() as specified in POSIX 1003.2-1992, section B.6.
  43  * Compares a filename or pathname to a pattern.
  44  */
  45
  46 #include <ctype.h>
  47 #include <fnmatch.h>
  48 #include <string.h>
  49 #include <stdio.h>
  50
  51 #include "collate.h"
  52
  53 #define EOS     '\0'
  54
  55 #define RANGE_MATCH     1
  56 #define RANGE_NOMATCH   0
  57 #define RANGE_ERROR     (-1)
  58
  59 static int rangematch __P((const char *, char, int, char **));
  60
  61 int
  62 fnmatch(pattern, string, flags)
  63         const char *pattern, *string;
  64         int flags;
  65 {
  66         const char *stringstart;
  67         char *newp;
  68         char c, test;
  69
  70         for (stringstart = string;;)
  71                 switch (c = *pattern++) {
  72                 case EOS:
  73                         if ((flags & FNM_LEADING_DIR) && *string == '/')
  74                                 return (0);
  75                         return (*string == EOS ? 0 : FNM_NOMATCH);
  76                 case '?':
  77                         if (*string == EOS)
  78                                 return (FNM_NOMATCH);
  79                         if (*string == '/' && (flags & FNM_PATHNAME))
  80                                 return (FNM_NOMATCH);
  81                         if (*string == '.' && (flags & FNM_PERIOD) &&
  82                             (string == stringstart ||
  83                             ((flags & FNM_PATHNAME) && *(string - 1) == '/')))
  84                                 return (FNM_NOMATCH);
  85                         ++string;
  86                         break;
  87                 case '*':
  88                         c = *pattern;
  89                         /* Collapse multiple stars. */
  90                         while (c == '*')
  91                                 c = *++pattern;
  92
  93                         if (*string == '.' && (flags & FNM_PERIOD) &&
  94                             (string == stringstart ||
  95                             ((flags & FNM_PATHNAME) && *(string - 1) == '/')))
  96                                 return (FNM_NOMATCH);
  97
  98                         /* Optimize for pattern with * at end or before /. */
  99                         if (c == EOS)
 100                                 if (flags & FNM_PATHNAME)
 101                                         return ((flags & FNM_LEADING_DIR) ||
 102                                             strchr(string, '/') == NULL ?
 103                                             0 : FNM_NOMATCH);
 104                                 else
 105                                         return (0);
 106                         else if (c == '/' && flags & FNM_PATHNAME) {
 107                                 if ((string = strchr(string, '/')) == NULL)
 108                                         return (FNM_NOMATCH);
 109                                 break;
 110                         }
 111
 112                         /* General case, use recursion. */
 113                         while ((test = *string) != EOS) {
 114                                 if (!fnmatch(pattern, string, flags & ~FNM_PERIOD))
 115                                         return (0);
 116                                 if (test == '/' && flags & FNM_PATHNAME)
 117                                         break;
 118                                 ++string;
 119                         }
 120                         return (FNM_NOMATCH);
 121                 case '[':
 122                         if (*string == EOS)
 123                                 return (FNM_NOMATCH);
 124                         if (*string == '/' && (flags & FNM_PATHNAME))
 125                                 return (FNM_NOMATCH);
 126                         if (*string == '.' && (flags & FNM_PERIOD) &&
 127                             (string == stringstart ||
 128                             ((flags & FNM_PATHNAME) && *(string - 1) == '/')))
 129                                 return (FNM_NOMATCH);
 130
 131                         switch (rangematch(pattern, *string, flags, &newp)) {
 132                         case RANGE_ERROR:
 133                                 goto norm;
 134                         case RANGE_MATCH:
 135                                 pattern = newp;
 136                                 break;
 137                         case RANGE_NOMATCH:
 138                                 return (FNM_NOMATCH);
 139                         }
 140                         ++string;
 141                         break;
 142                 case '\\':
 143                         if (!(flags & FNM_NOESCAPE)) {
 144                                 if ((c = *pattern++) == EOS) {
 145                                         c = '\\';
 146                                         --pattern;
 147                                 }
 148                         }
 149                         /* FALLTHROUGH */
 150                 default:
 151                 norm:
 152                         if (c == *string)
 153                                 ;
 154                         else if ((flags & FNM_CASEFOLD) &&
 155                                  (tolower((unsigned char)c) ==
 156                                   tolower((unsigned char)*string)))
 157                                 ;
 158                         else
 159                                 return (FNM_NOMATCH);
 160                         string++;
 161                         break;
 162                 }
 163         /* NOTREACHED */
 164 }
 165
 166 static int
 167 rangematch(pattern, test, flags, newp)
 168         const char *pattern;
 169         char test;
 170         int flags;
 171         char **newp;
 172 {
 173         int negate, ok;
 174         char c, c2;
 175
 176         /*
 177          * A bracket expression starting with an unquoted circumflex
 178          * character produces unspecified results (IEEE 1003.2-1992,
 179          * 3.13.2).  This implementation treats it like '!', for
 180          * consistency with the regular expression syntax.
 181          * J.T. Conklin (conklin@ngai.kaleida.com)
 182          */
 183         if ( (negate = (*pattern == '!' || *pattern == '^')) )
 184                 ++pattern;
 185
 186         if (flags & FNM_CASEFOLD)
 187                 test = tolower((unsigned char)test);
 188
 189         /*
 190          * A right bracket shall lose its special meaning and represent
 191          * itself in a bracket expression if it occurs first in the list.
 192          * -- POSIX.2 2.8.3.2
 193          */
 194         ok = 0;
 195         c = *pattern++;
 196         do {
 197                 if (c == '\\' && !(flags & FNM_NOESCAPE))
 198                         c = *pattern++;
 199                 if (c == EOS)
 200                         return (RANGE_ERROR);
 201
 202                 if (c == '/' && (flags & FNM_PATHNAME))
 203                         return (RANGE_NOMATCH);
 204
 205                 if (flags & FNM_CASEFOLD)
 206                         c = tolower((unsigned char)c);
 207
 208                 if (*pattern == '-'
 209                     && (c2 = *(pattern+1)) != EOS && c2 != ']') {
 210                         pattern += 2;
 211                         if (c2 == '\\' && !(flags & FNM_NOESCAPE))
 212                                 c2 = *pattern++;
 213                         if (c2 == EOS)
 214                                 return (RANGE_ERROR);
 215
 216                         if (flags & FNM_CASEFOLD)
 217                                 c2 = tolower((unsigned char)c2);
 218
 219                         if (__collate_load_error ?
 220                             c <= test && test <= c2 :
 221                                __collate_range_cmp(c, test) <= 0
 222                             && __collate_range_cmp(test, c2) <= 0
 223                            )
 224                                 ok = 1;
 225                 } else if (c == test)
 226                         ok = 1;
 227         } while ((c = *pattern++) != ']');
 228
 229         *newp = (char *)pattern;
 230         return (ok == negate ? RANGE_NOMATCH : RANGE_MATCH);
 231 }