lib/libc/gen/fnmatch.c

   1 /*      $NetBSD: fnmatch.c,v 1.26 2014/10/12 22:32:33 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 1.26 2014/10/12 22:32:33 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, need;
  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         need = 1;
  92         for (ok = 0; (c = FOLDCASE(*pattern++, flags)) != ']' || need;) {
  93                 need = 0;
  94                 if (c == '/')
  95                         return (void *)-1;
  96                 if (c == '\\' && !(flags & FNM_NOESCAPE))
  97                         c = FOLDCASE(*pattern++, flags);
  98                 if (c == EOS)
  99                         return NULL;
 100                 if (*pattern == '-'
 101                     && (c2 = FOLDCASE(*(pattern + 1), flags)) != EOS &&
 102                         c2 != ']') {
 103                         pattern += 2;
 104                         if (c2 == '\\' && !(flags & FNM_NOESCAPE))
 105                                 c2 = FOLDCASE(*pattern++, flags);
 106                         if (c2 == EOS)
 107                                 return NULL;
 108                         if (c <= test && test <= c2)
 109                                 ok = 1;
 110                 } else if (c == test)
 111                         ok = 1;
 112         }
 113         return ok == negate ? NULL : pattern;
 114 }
 115
 116
 117 static int
 118 fnmatchx(const char *pattern, const char *string, int flags, size_t recursion)
 119 {
 120         const char *stringstart, *r;
 121         char c, test;
 122
 123         _DIAGASSERT(pattern != NULL);
 124         _DIAGASSERT(string != NULL);
 125
 126         if (recursion-- == 0)
 127                 return FNM_NORES;
 128
 129         for (stringstart = string;;) {
 130                 switch (c = FOLDCASE(*pattern++, flags)) {
 131                 case EOS:
 132                         if ((flags & FNM_LEADING_DIR) && *string == '/')
 133                                 return 0;
 134                         return *string == EOS ? 0 : FNM_NOMATCH;
 135                 case '?':
 136                         if (*string == EOS)
 137                                 return FNM_NOMATCH;
 138                         if (*string == '/' && (flags & FNM_PATHNAME))
 139                                 return FNM_NOMATCH;
 140                         if (*string == '.' && (flags & FNM_PERIOD) &&
 141                             (string == stringstart ||
 142                             ((flags & FNM_PATHNAME) && *(string - 1) == '/')))
 143                                 return FNM_NOMATCH;
 144                         ++string;
 145                         break;
 146                 case '*':
 147                         c = FOLDCASE(*pattern, flags);
 148                         /* Collapse multiple stars. */
 149                         while (c == '*')
 150                                 c = FOLDCASE(*++pattern, flags);
 151
 152                         if (*string == '.' && (flags & FNM_PERIOD) &&
 153                             (string == stringstart ||
 154                             ((flags & FNM_PATHNAME) && *(string - 1) == '/')))
 155                                 return FNM_NOMATCH;
 156
 157                         /* Optimize for pattern with * at end or before /. */
 158                         if (c == EOS) {
 159                                 if (flags & FNM_PATHNAME)
 160                                         return (flags & FNM_LEADING_DIR) ||
 161                                             strchr(string, '/') == NULL ?
 162                                             0 : FNM_NOMATCH;
 163                                 else
 164                                         return 0;
 165                         } else if (c == '/' && flags & FNM_PATHNAME) {
 166                                 if ((string = strchr(string, '/')) == NULL)
 167                                         return FNM_NOMATCH;
 168                                 break;
 169                         }
 170
 171                         /* General case, use recursion. */
 172                         while ((test = FOLDCASE(*string, flags)) != EOS) {
 173                                 int e;
 174                                 switch ((e = fnmatchx(pattern, string,
 175                                     flags & ~FNM_PERIOD, recursion))) {
 176                                 case FNM_NOMATCH:
 177                                         break;
 178                                 default:
 179                                         return e;
 180                                 }
 181                                 if (test == '/' && flags & FNM_PATHNAME)
 182                                         break;
 183                                 ++string;
 184                         }
 185                         return FNM_NOMATCH;
 186                 case '[':
 187                         if (*string == EOS)
 188                                 return FNM_NOMATCH;
 189                         if (*string == '/' && flags & FNM_PATHNAME)
 190                                 return FNM_NOMATCH;
 191                         if ((r = rangematch(pattern,
 192                             FOLDCASE(*string, flags), flags)) == NULL)
 193                                 return FNM_NOMATCH;
 194                         if (r == (void *)-1) {
 195                                 if (*string != '[')
 196                                         return FNM_NOMATCH;
 197                         } else
 198                                 pattern = r;
 199                         ++string;
 200                         break;
 201                 case '\\':
 202                         if (!(flags & FNM_NOESCAPE)) {
 203                                 if ((c = FOLDCASE(*pattern++, flags)) == EOS) {
 204                                         c = '\0';
 205                                         --pattern;
 206                                 }
 207                         }
 208                         /* FALLTHROUGH */
 209                 default:
 210                         if (c != FOLDCASE(*string++, flags))
 211                                 return FNM_NOMATCH;
 212                         break;
 213                 }
 214         }
 215         /* NOTREACHED */
 216 }
 217
 218 int
 219 fnmatch(const char *pattern, const char *string, int flags)
 220 {
 221         return fnmatchx(pattern, string, flags, 64);
 222 }