lib/libc/gen/fnmatch.c

   1 /*      $NetBSD: fnmatch.c,v 1.25 2012/03/25 16:31:23 christos 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 #include <sys/cdefs.h>
  36 #if defined(LIBC_SCCS) && !defined(lint)
  37 #if 0
  38 static char sccsid[] = "@(#)fnmatch.c   8.2 (Berkeley) 4/16/94";
  39 #else
  40 __RCSID("$NetBSD: fnmatch.c,v 1.25 2012/03/25 16:31:23 christos Exp $");
  41 #endif
  42 #endif /* LIBC_SCCS and not lint */
  43
  44 /*
  45  * Function fnmatch() as specified in POSIX 1003.2-1992, section B.6.
  46  * Compares a filename or pathname to a pattern.
  47  */
  48
  49 #include "namespace.h"
  50
  51 #include <assert.h>
  52 #include <ctype.h>
  53 #include <fnmatch.h>
  54 #include <string.h>
  55
  56 #ifdef __weak_alias
  57 __weak_alias(fnmatch,_fnmatch)
  58 #endif
  59
  60 #define EOS     '\0'
  61
  62 static inline int
  63 foldcase(int ch, int flags)
  64 {
  65
  66         if ((flags & FNM_CASEFOLD) != 0 && isupper(ch))
  67                 return tolower(ch);
  68         return ch;
  69 }
  70
  71 #define FOLDCASE(ch, flags)     foldcase((unsigned char)(ch), (flags))
  72
  73 static const char *
  74 rangematch(const char *pattern, int test, int flags)
  75 {
  76         int negate, ok;
  77         char c, c2;
  78
  79         _DIAGASSERT(pattern != NULL);
  80
  81         /*
  82          * A bracket expression starting with an unquoted circumflex
  83          * character produces unspecified results (IEEE 1003.2-1992,
  84          * 3.13.2).  This implementation treats it like '!', for
  85          * consistency with the regular expression syntax.
  86          * J.T. Conklin (conklin@ngai.kaleida.com)
  87          */
  88         if ((negate = (*pattern == '!' || *pattern == '^')) != 0)
  89                 ++pattern;
  90
  91         for (ok = 0; (c = FOLDCASE(*pattern++, flags)) != ']';) {
  92                 if (c == '\\' && !(flags & FNM_NOESCAPE))
  93                         c = FOLDCASE(*pattern++, flags);
  94                 if (c == EOS)
  95                         return NULL;
  96                 if (*pattern == '-'
  97                     && (c2 = FOLDCASE(*(pattern + 1), flags)) != EOS &&
  98                         c2 != ']') {
  99                         pattern += 2;
 100                         if (c2 == '\\' && !(flags & FNM_NOESCAPE))
 101                                 c2 = FOLDCASE(*pattern++, flags);
 102                         if (c2 == EOS)
 103                                 return NULL;
 104                         if (c <= test && test <= c2)
 105                                 ok = 1;
 106                 } else if (c == test)
 107                         ok = 1;
 108         }
 109         return ok == negate ? NULL : pattern;
 110 }
 111
 112
 113 static int
 114 fnmatchx(const char *pattern, const char *string, int flags, size_t recursion)
 115 {
 116         const char *stringstart;
 117         char c, test;
 118
 119         _DIAGASSERT(pattern != NULL);
 120         _DIAGASSERT(string != NULL);
 121
 122         if (recursion-- == 0)
 123                 return FNM_NORES;
 124
 125         for (stringstart = string;;) {
 126                 switch (c = FOLDCASE(*pattern++, flags)) {
 127                 case EOS:
 128                         if ((flags & FNM_LEADING_DIR) && *string == '/')
 129                                 return 0;
 130                         return *string == EOS ? 0 : FNM_NOMATCH;
 131                 case '?':
 132                         if (*string == EOS)
 133                                 return FNM_NOMATCH;
 134                         if (*string == '/' && (flags & FNM_PATHNAME))
 135                                 return FNM_NOMATCH;
 136                         if (*string == '.' && (flags & FNM_PERIOD) &&
 137                             (string == stringstart ||
 138                             ((flags & FNM_PATHNAME) && *(string - 1) == '/')))
 139                                 return FNM_NOMATCH;
 140                         ++string;
 141                         break;
 142                 case '*':
 143                         c = FOLDCASE(*pattern, flags);
 144                         /* Collapse multiple stars. */
 145                         while (c == '*')
 146                                 c = FOLDCASE(*++pattern, flags);
 147
 148                         if (*string == '.' && (flags & FNM_PERIOD) &&
 149                             (string == stringstart ||
 150                             ((flags & FNM_PATHNAME) && *(string - 1) == '/')))
 151                                 return FNM_NOMATCH;
 152
 153                         /* Optimize for pattern with * at end or before /. */
 154                         if (c == EOS) {
 155                                 if (flags & FNM_PATHNAME)
 156                                         return (flags & FNM_LEADING_DIR) ||
 157                                             strchr(string, '/') == NULL ?
 158                                             0 : FNM_NOMATCH;
 159                                 else
 160                                         return 0;
 161                         } else if (c == '/' && flags & FNM_PATHNAME) {
 162                                 if ((string = strchr(string, '/')) == NULL)
 163                                         return FNM_NOMATCH;
 164                                 break;
 165                         }
 166
 167                         /* General case, use recursion. */
 168                         while ((test = FOLDCASE(*string, flags)) != EOS) {
 169                                 int e;
 170                                 switch ((e = fnmatchx(pattern, string,
 171                                     flags & ~FNM_PERIOD, recursion))) {
 172                                 case FNM_NOMATCH:
 173                                         break;
 174                                 default:
 175                                         return e;
 176                                 }
 177                                 if (test == '/' && flags & FNM_PATHNAME)
 178                                         break;
 179                                 ++string;
 180                         }
 181                         return FNM_NOMATCH;
 182                 case '[':
 183                         if (*string == EOS)
 184                                 return FNM_NOMATCH;
 185                         if (*string == '/' && flags & FNM_PATHNAME)
 186                                 return FNM_NOMATCH;
 187                         if ((pattern = rangematch(pattern,
 188                             FOLDCASE(*string, flags), flags)) == NULL)
 189                                 return FNM_NOMATCH;
 190                         ++string;
 191                         break;
 192                 case '\\':
 193                         if (!(flags & FNM_NOESCAPE)) {
 194                                 if ((c = FOLDCASE(*pattern++, flags)) == EOS) {
 195                                         c = '\0';
 196                                         --pattern;
 197                                 }
 198                         }
 199                         /* FALLTHROUGH */
 200                 default:
 201                         if (c != FOLDCASE(*string++, flags))
 202                                 return FNM_NOMATCH;
 203                         break;
 204                 }
 205         }
 206         /* NOTREACHED */
 207 }
 208
 209 int
 210 fnmatch(const char *pattern, const char *string, int flags)
 211 {
 212         return fnmatchx(pattern, string, flags, 64);
 213 }