newlib/libc/posix/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  * 4. Neither the name of the University nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  */
  32
  33 #ifndef _NO_FNMATCH
  34
  35 #if defined(LIBC_SCCS) && !defined(lint)
  36 static char sccsid[] = "@(#)fnmatch.c   8.2 (Berkeley) 4/16/94";
  37 #endif /* LIBC_SCCS and not lint */
  38 #include <sys/cdefs.h>
  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(pattern, string, flags)
  62         const char *pattern, *string;
  63         int flags;
  64 {
  65         const char *stringstart;
  66         char *newp;
  67         char c, test;
  68
  69         for (stringstart = string;;)
  70                 switch (c = *pattern++) {
  71                 case EOS:
  72                         if ((flags & FNM_LEADING_DIR) && *string == '/')
  73                                 return (0);
  74                         return (*string == EOS ? 0 : FNM_NOMATCH);
  75                 case '?':
  76                         if (*string == EOS)
  77                                 return (FNM_NOMATCH);
  78                         if (*string == '/' && (flags & FNM_PATHNAME))
  79                                 return (FNM_NOMATCH);
  80                         if (*string == '.' && (flags & FNM_PERIOD) &&
  81                             (string == stringstart ||
  82                             ((flags & FNM_PATHNAME) && *(string - 1) == '/')))
  83                                 return (FNM_NOMATCH);
  84                         ++string;
  85                         break;
  86                 case '*':
  87                         c = *pattern;
  88                         /* Collapse multiple stars. */
  89                         while (c == '*')
  90                                 c = *++pattern;
  91
  92                         if (*string == '.' && (flags & FNM_PERIOD) &&
  93                             (string == stringstart ||
  94                             ((flags & FNM_PATHNAME) && *(string - 1) == '/')))
  95                                 return (FNM_NOMATCH);
  96
  97                         /* Optimize for pattern with * at end or before /. */
  98                         if (c == EOS)
  99                                 if (flags & FNM_PATHNAME)
 100                                         return ((flags & FNM_LEADING_DIR) ||
 101                                             strchr(string, '/') == NULL ?
 102                                             0 : FNM_NOMATCH);
 103                                 else
 104                                         return (0);
 105                         else if (c == '/' && flags & FNM_PATHNAME) {
 106                                 if ((string = strchr(string, '/')) == NULL)
 107                                         return (FNM_NOMATCH);
 108                                 break;
 109                         }
 110
 111                         /* General case, use recursion. */
 112                         while ((test = *string) != EOS) {
 113                                 if (!fnmatch(pattern, string, flags & ~FNM_PERIOD))
 114                                         return (0);
 115                                 if (test == '/' && flags & FNM_PATHNAME)
 116                                         break;
 117                                 ++string;
 118                         }
 119                         return (FNM_NOMATCH);
 120                 case '[':
 121                         if (*string == EOS)
 122                                 return (FNM_NOMATCH);
 123                         if (*string == '/' && (flags & FNM_PATHNAME))
 124                                 return (FNM_NOMATCH);
 125                         if (*string == '.' && (flags & FNM_PERIOD) &&
 126                             (string == stringstart ||
 127                             ((flags & FNM_PATHNAME) && *(string - 1) == '/')))
 128                                 return (FNM_NOMATCH);
 129
 130                         switch (rangematch(pattern, *string, flags, &newp)) {
 131                         case RANGE_ERROR:
 132                                 goto norm;
 133                         case RANGE_MATCH:
 134                                 pattern = newp;
 135                                 break;
 136                         case RANGE_NOMATCH:
 137                                 return (FNM_NOMATCH);
 138                         }
 139                         ++string;
 140                         break;
 141                 case '\\':
 142                         if (!(flags & FNM_NOESCAPE)) {
 143                                 if ((c = *pattern++) == EOS) {
 144                                         c = '\\';
 145                                         --pattern;
 146                                 }
 147                         }
 148                         /* FALLTHROUGH */
 149                 default:
 150                 norm:
 151                         if (c == *string)
 152                                 ;
 153                         else if ((flags & FNM_CASEFOLD) &&
 154                                  (tolower((unsigned char)c) ==
 155                                   tolower((unsigned char)*string)))
 156                                 ;
 157                         else
 158                                 return (FNM_NOMATCH);
 159                         string++;
 160                         break;
 161                 }
 162         /* NOTREACHED */
 163 }
 164
 165 static int
 166 rangematch(
 167         const char *pattern,
 168         char test,
 169         int flags,
 170         char **newp
 171 )
 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 }
 232
 233 #endif /* !_NO_FNMATCH  */