lib/libc/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  * @(#)fnmatch.c        8.2 (Berkeley) 4/16/94
  37  * $DragonFly: src/lib/libc/gen/fnmatch.c,v 1.6 2005/11/13 00:07:42 swildner Exp $
  38  */
  39
  40 /*
  41  * Function fnmatch() as specified in POSIX 1003.2-1992, section B.6.
  42  * Compares a filename or pathname to a pattern.
  43  */
  44
  45 #include <ctype.h>
  46 #include <fnmatch.h>
  47 #include <string.h>
  48 #include <stdio.h>
  49
  50 #include "collate.h"
  51
  52 #define EOS     '\0'
  53
  54 #define RANGE_MATCH     1
  55 #define RANGE_NOMATCH   0
  56 #define RANGE_ERROR     (-1)
  57
  58 static int rangematch (const char *, char, int, char **);
  59
  60 int
  61 fnmatch(const char *pattern, const char *string, int flags)
  62 {
  63         const char *stringstart;
  64         char *newp;
  65         char c, test;
  66
  67         for (stringstart = string;;)
  68                 switch (c = *pattern++) {
  69                 case EOS:
  70                         if ((flags & FNM_LEADING_DIR) && *string == '/')
  71                                 return (0);
  72                         return (*string == EOS ? 0 : FNM_NOMATCH);
  73                 case '?':
  74                         if (*string == EOS)
  75                                 return (FNM_NOMATCH);
  76                         if (*string == '/' && (flags & FNM_PATHNAME))
  77                                 return (FNM_NOMATCH);
  78                         if (*string == '.' && (flags & FNM_PERIOD) &&
  79                             (string == stringstart ||
  80                             ((flags & FNM_PATHNAME) && *(string - 1) == '/')))
  81                                 return (FNM_NOMATCH);
  82                         ++string;
  83                         break;
  84                 case '*':
  85                         c = *pattern;
  86                         /* Collapse multiple stars. */
  87                         while (c == '*')
  88                                 c = *++pattern;
  89
  90                         if (*string == '.' && (flags & FNM_PERIOD) &&
  91                             (string == stringstart ||
  92                             ((flags & FNM_PATHNAME) && *(string - 1) == '/')))
  93                                 return (FNM_NOMATCH);
  94
  95                         /* Optimize for pattern with * at end or before /. */
  96                         if (c == EOS)
  97                                 if (flags & FNM_PATHNAME)
  98                                         return ((flags & FNM_LEADING_DIR) ||
  99                                             strchr(string, '/') == NULL ?
 100                                             0 : FNM_NOMATCH);
 101                                 else
 102                                         return (0);
 103                         else if (c == '/' && flags & FNM_PATHNAME) {
 104                                 if ((string = strchr(string, '/')) == NULL)
 105                                         return (FNM_NOMATCH);
 106                                 break;
 107                         }
 108
 109                         /* General case, use recursion. */
 110                         while ((test = *string) != EOS) {
 111                                 if (!fnmatch(pattern, string, flags & ~FNM_PERIOD))
 112                                         return (0);
 113                                 if (test == '/' && flags & FNM_PATHNAME)
 114                                         break;
 115                                 ++string;
 116                         }
 117                         return (FNM_NOMATCH);
 118                 case '[':
 119                         if (*string == EOS)
 120                                 return (FNM_NOMATCH);
 121                         if (*string == '/' && (flags & FNM_PATHNAME))
 122                                 return (FNM_NOMATCH);
 123                         if (*string == '.' && (flags & FNM_PERIOD) &&
 124                             (string == stringstart ||
 125                             ((flags & FNM_PATHNAME) && *(string - 1) == '/')))
 126                                 return (FNM_NOMATCH);
 127
 128                         switch (rangematch(pattern, *string, flags, &newp)) {
 129                         case RANGE_ERROR:
 130                                 goto norm;
 131                         case RANGE_MATCH:
 132                                 pattern = newp;
 133                                 break;
 134                         case RANGE_NOMATCH:
 135                                 return (FNM_NOMATCH);
 136                         }
 137                         ++string;
 138                         break;
 139                 case '\\':
 140                         if (!(flags & FNM_NOESCAPE)) {
 141                                 if ((c = *pattern++) == EOS) {
 142                                         c = '\\';
 143                                         --pattern;
 144                                 }
 145                         }
 146                         /* FALLTHROUGH */
 147                 default:
 148                 norm:
 149                         if (c == *string)
 150                                 ;
 151                         else if ((flags & FNM_CASEFOLD) &&
 152                                  (tolower((unsigned char)c) ==
 153                                   tolower((unsigned char)*string)))
 154                                 ;
 155                         else
 156                                 return (FNM_NOMATCH);
 157                         string++;
 158                         break;
 159                 }
 160         /* NOTREACHED */
 161 }
 162
 163 static int
 164 rangematch(const char *pattern, char test, int flags, char **newp)
 165 {
 166         int negate, ok;
 167         char c, c2;
 168
 169         /*
 170          * A bracket expression starting with an unquoted circumflex
 171          * character produces unspecified results (IEEE 1003.2-1992,
 172          * 3.13.2).  This implementation treats it like '!', for
 173          * consistency with the regular expression syntax.
 174          * J.T. Conklin (conklin@ngai.kaleida.com)
 175          */
 176         if ( (negate = (*pattern == '!' || *pattern == '^')) )
 177                 ++pattern;
 178
 179         if (flags & FNM_CASEFOLD)
 180                 test = tolower((unsigned char)test);
 181
 182         /*
 183          * A right bracket shall lose its special meaning and represent
 184          * itself in a bracket expression if it occurs first in the list.
 185          * -- POSIX.2 2.8.3.2
 186          */
 187         ok = 0;
 188         c = *pattern++;
 189         do {
 190                 if (c == '\\' && !(flags & FNM_NOESCAPE))
 191                         c = *pattern++;
 192                 if (c == EOS)
 193                         return (RANGE_ERROR);
 194
 195                 if (c == '/' && (flags & FNM_PATHNAME))
 196                         return (RANGE_NOMATCH);
 197
 198                 if (flags & FNM_CASEFOLD)
 199                         c = tolower((unsigned char)c);
 200
 201                 if (*pattern == '-'
 202                     && (c2 = *(pattern+1)) != EOS && c2 != ']') {
 203                         pattern += 2;
 204                         if (c2 == '\\' && !(flags & FNM_NOESCAPE))
 205                                 c2 = *pattern++;
 206                         if (c2 == EOS)
 207                                 return (RANGE_ERROR);
 208
 209                         if (flags & FNM_CASEFOLD)
 210                                 c2 = tolower((unsigned char)c2);
 211
 212                         if (__collate_load_error ?
 213                             c <= test && test <= c2 :
 214                                __collate_range_cmp(c, test) <= 0
 215                             && __collate_range_cmp(test, c2) <= 0
 216                            )
 217                                 ok = 1;
 218                 } else if (c == test)
 219                         ok = 1;
 220         } while ((c = *pattern++) != ']');
 221
 222         *newp = __DECONST(char *, pattern);
 223         return (ok == negate ? RANGE_NOMATCH : RANGE_MATCH);
 224 }