packages/io/fileio/v2_0/src/fnmatch.c

   1 /*      $NetBSD: fnmatch.c,v 1.21 2005/12/24 21:11:16 perry Exp $       */
   2
   3 /*
   4  * Copyright (c) 1989, 1993, 1994
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * This code is derived from software contributed to Berkeley by
   8  * Guido van Rossum.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  * 3. Neither the name of the University nor the names of its contributors
  19  *    may be used to endorse or promote products derived from this software
  20  *    without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  */
  34
  35 /*
  36  * Function fnmatch() as specified in POSIX 1003.2-1992, section B.6.
  37  * Compares a filename or pathname to a pattern.
  38  */
  39
  40 #include <cyg/infra/cyg_ass.h>          // assertion macros
  41 #include <ctype.h>
  42 #include <fnmatch.h>
  43 #include <string.h>
  44
  45 #define EOS     '\0'
  46
  47 static const char *rangematch(const char *, int, int);
  48
  49 static inline int
  50 foldcase(int ch, int flags)
  51 {
  52
  53         if ((flags & FNM_CASEFOLD) != 0 && isupper(ch))
  54                 return (tolower(ch));
  55         return (ch);
  56 }
  57
  58 #define FOLDCASE(ch, flags)     foldcase((unsigned char)(ch), (flags))
  59
  60 int
  61 fnmatch(const char *pattern, const char *string, int flags)
  62 {
  63         const char *stringstart;
  64         char c, test;
  65
  66         CYG_ASSERT(pattern != NULL, "pattern NULL pointer!");
  67         CYG_ASSERT(string != NULL, "string NULL pointer!");
  68
  69         for (stringstart = string;;)
  70                 switch (c = FOLDCASE(*pattern++, flags)) {
  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 = FOLDCASE(*pattern, flags);
  88                         /* Collapse multiple stars. */
  89                         while (c == '*')
  90                                 c = FOLDCASE(*++pattern, flags);
  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 = FOLDCASE(*string, flags)) != EOS) {
 113                                 if (!fnmatch(pattern, string,
 114                                              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 ((pattern =
 127                             rangematch(pattern, FOLDCASE(*string, flags),
 128                                        flags)) == NULL)
 129                                 return (FNM_NOMATCH);
 130                         ++string;
 131                         break;
 132                 case '\\':
 133                         if (!(flags & FNM_NOESCAPE)) {
 134                                 if ((c = FOLDCASE(*pattern++, flags)) == EOS) {
 135                                         c = '\\';
 136                                         --pattern;
 137                                 }
 138                         }
 139                         /* FALLTHROUGH */
 140                 default:
 141                         if (c != FOLDCASE(*string++, flags))
 142                                 return (FNM_NOMATCH);
 143                         break;
 144                 }
 145         /* NOTREACHED */
 146 }
 147
 148 static const char *
 149 rangematch(const char *pattern, int test, int flags)
 150 {
 151         int negate, ok;
 152         char c, c2;
 153
 154         CYG_ASSERT(pattern != NULL, "pattern NULL pointer!");
 155
 156         /*
 157          * A bracket expression starting with an unquoted circumflex
 158          * character produces unspecified results (IEEE 1003.2-1992,
 159          * 3.13.2).  This implementation treats it like '!', for
 160          * consistency with the regular expression syntax.
 161          * J.T. Conklin (conklin@ngai.kaleida.com)
 162          */
 163         if ((negate = (*pattern == '!' || *pattern == '^')) != 0)
 164                 ++pattern;
 165
 166         for (ok = 0; (c = FOLDCASE(*pattern++, flags)) != ']';) {
 167                 if (c == '\\' && !(flags & FNM_NOESCAPE))
 168                         c = FOLDCASE(*pattern++, flags);
 169                 if (c == EOS)
 170                         return (NULL);
 171                 if (*pattern == '-'
 172                     && (c2 = FOLDCASE(*(pattern+1), flags)) != EOS &&
 173                         c2 != ']') {
 174                         pattern += 2;
 175                         if (c2 == '\\' && !(flags & FNM_NOESCAPE))
 176                                 c2 = FOLDCASE(*pattern++, flags);
 177                         if (c2 == EOS)
 178                                 return (NULL);
 179                         if (c <= test && test <= c2)
 180                                 ok = 1;
 181                 } else if (c == test)
 182                         ok = 1;
 183         }
 184         return (ok == negate ? NULL : pattern);
 185 }