gen/FreeBSD/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 #if defined(LIBC_SCCS) && !defined(lint)
  34 static char sccsid[] = "@(#)fnmatch.c   8.2 (Berkeley) 4/16/94";
  35 #endif /* LIBC_SCCS and not lint */
  36 #include <sys/cdefs.h>
  37 __FBSDID("$FreeBSD: src/lib/libc/gen/fnmatch.c,v 1.19 2010/04/16 22:29:24 jilles Exp $");
  38
  39 /*
  40  * Function fnmatch() as specified in POSIX 1003.2-1992, section B.6.
  41  * Compares a filename or pathname to a pattern.
  42  */
  43
  44 /*
  45  * Some notes on multibyte character support:
  46  * 1. Patterns with illegal byte sequences match nothing.
  47  * 2. Illegal byte sequences in the "string" argument are handled by treating
  48  *    them as single-byte characters with a value of the first byte of the
  49  *    sequence cast to wchar_t.
  50  * 3. Multibyte conversion state objects (mbstate_t) are passed around and
  51  *    used for most, but not all, conversions. Further work will be required
  52  *    to support state-dependent encodings.
  53  */
  54
  55 #include <fnmatch.h>
  56 #include <limits.h>
  57 #include <string.h>
  58 #include <wchar.h>
  59 #include <wctype.h>
  60
  61 #include "collate.h"
  62
  63 #define EOS     '\0'
  64
  65 #define RANGE_MATCH     1
  66 #define RANGE_NOMATCH   0
  67 #define RANGE_ERROR     (-1)
  68
  69 static int rangematch(const char *, wchar_t, int, char **, mbstate_t *);
  70 static int fnmatch1(const char *, const char *, const char *, int, mbstate_t,
  71                 mbstate_t);
  72
  73 int
  74 fnmatch(pattern, string, flags)
  75         const char *pattern, *string;
  76         int flags;
  77 {
  78         static const mbstate_t initial;
  79
  80         return (fnmatch1(pattern, string, string, flags, initial, initial));
  81 }
  82
  83 static int
  84 fnmatch1(pattern, string, stringstart, flags, patmbs, strmbs)
  85         const char *pattern, *string, *stringstart;
  86         int flags;
  87         mbstate_t patmbs, strmbs;
  88 {
  89         char *newp;
  90         char c;
  91         wchar_t pc, sc;
  92         size_t pclen, sclen;
  93
  94         for (;;) {
  95                 pclen = mbrtowc(&pc, pattern, MB_LEN_MAX, &patmbs);
  96                 if (pclen == (size_t)-1 || pclen == (size_t)-2)
  97                         return (FNM_NOMATCH);
  98                 pattern += pclen;
  99                 sclen = mbrtowc(&sc, string, MB_LEN_MAX, &strmbs);
 100                 if (sclen == (size_t)-1 || sclen == (size_t)-2) {
 101                         sc = (unsigned char)*string;
 102                         sclen = 1;
 103                         memset(&strmbs, 0, sizeof(strmbs));
 104                 }
 105                 switch (pc) {
 106                 case EOS:
 107                         if ((flags & FNM_LEADING_DIR) && sc == '/')
 108                                 return (0);
 109                         return (sc == EOS ? 0 : FNM_NOMATCH);
 110                 case '?':
 111                         if (sc == EOS)
 112                                 return (FNM_NOMATCH);
 113                         if (sc == '/' && (flags & FNM_PATHNAME))
 114                                 return (FNM_NOMATCH);
 115                         if (sc == '.' && (flags & FNM_PERIOD) &&
 116                             (string == stringstart ||
 117                             ((flags & FNM_PATHNAME) && *(string - 1) == '/')))
 118                                 return (FNM_NOMATCH);
 119                         string += sclen;
 120                         break;
 121                 case '*':
 122                         c = *pattern;
 123                         /* Collapse multiple stars. */
 124                         while (c == '*')
 125                                 c = *++pattern;
 126
 127                         if (sc == '.' && (flags & FNM_PERIOD) &&
 128                             (string == stringstart ||
 129                             ((flags & FNM_PATHNAME) && *(string - 1) == '/')))
 130                                 return (FNM_NOMATCH);
 131
 132                         /* Optimize for pattern with * at end or before /. */
 133                         if (c == EOS)
 134                                 if (flags & FNM_PATHNAME)
 135                                         return ((flags & FNM_LEADING_DIR) ||
 136                                             strchr(string, '/') == NULL ?
 137                                             0 : FNM_NOMATCH);
 138                                 else
 139                                         return (0);
 140                         else if (c == '/' && flags & FNM_PATHNAME) {
 141                                 if ((string = strchr(string, '/')) == NULL)
 142                                         return (FNM_NOMATCH);
 143                                 break;
 144                         }
 145
 146                         /* General case, use recursion. */
 147                         while (sc != EOS) {
 148                                 if (!fnmatch1(pattern, string, stringstart,
 149                                     flags, patmbs, strmbs))
 150                                         return (0);
 151                                 sclen = mbrtowc(&sc, string, MB_LEN_MAX,
 152                                     &strmbs);
 153                                 if (sclen == (size_t)-1 ||
 154                                     sclen == (size_t)-2) {
 155                                         sc = (unsigned char)*string;
 156                                         sclen = 1;
 157                                         memset(&strmbs, 0, sizeof(strmbs));
 158                                 }
 159                                 if (sc == '/' && flags & FNM_PATHNAME)
 160                                         break;
 161                                 string += sclen;
 162                         }
 163                         return (FNM_NOMATCH);
 164                 case '[':
 165                         if (sc == EOS)
 166                                 return (FNM_NOMATCH);
 167                         if (sc == '/' && (flags & FNM_PATHNAME))
 168                                 return (FNM_NOMATCH);
 169                         if (sc == '.' && (flags & FNM_PERIOD) &&
 170                             (string == stringstart ||
 171                             ((flags & FNM_PATHNAME) && *(string - 1) == '/')))
 172                                 return (FNM_NOMATCH);
 173
 174                         switch (rangematch(pattern, sc, flags, &newp,
 175                             &patmbs)) {
 176                         case RANGE_ERROR:
 177                                 goto norm;
 178                         case RANGE_MATCH:
 179                                 pattern = newp;
 180                                 break;
 181                         case RANGE_NOMATCH:
 182                                 return (FNM_NOMATCH);
 183                         }
 184                         string += sclen;
 185                         break;
 186                 case '\\':
 187                         if (!(flags & FNM_NOESCAPE)) {
 188                                 pclen = mbrtowc(&pc, pattern, MB_LEN_MAX,
 189                                     &patmbs);
 190                                 if (pclen == (size_t)-1 || pclen == (size_t)-2)
 191                                         return (FNM_NOMATCH);
 192                                 if (pclen == 0)
 193                                         pc = '\\';
 194                                 pattern += pclen;
 195                         }
 196                         /* FALLTHROUGH */
 197                 default:
 198                 norm:
 199                         if (pc == sc)
 200                                 ;
 201                         else if ((flags & FNM_CASEFOLD) &&
 202                                  (towlower(pc) == towlower(sc)))
 203                                 ;
 204                         else
 205                                 return (FNM_NOMATCH);
 206                         string += sclen;
 207                         break;
 208                 }
 209         }
 210         /* NOTREACHED */
 211 }
 212
 213 static int
 214 rangematch(pattern, test, flags, newp, patmbs)
 215         const char *pattern;
 216         wchar_t test;
 217         int flags;
 218         char **newp;
 219         mbstate_t *patmbs;
 220 {
 221         int negate, ok;
 222         wchar_t c, c2;
 223         size_t pclen;
 224         const char *origpat;
 225
 226         /*
 227          * A bracket expression starting with an unquoted circumflex
 228          * character produces unspecified results (IEEE 1003.2-1992,
 229          * 3.13.2).  This implementation treats it like '!', for
 230          * consistency with the regular expression syntax.
 231          * J.T. Conklin (conklin@ngai.kaleida.com)
 232          */
 233         if ( (negate = (*pattern == '!' || *pattern == '^')) )
 234                 ++pattern;
 235
 236         if (flags & FNM_CASEFOLD)
 237                 test = towlower(test);
 238
 239         /*
 240          * A right bracket shall lose its special meaning and represent
 241          * itself in a bracket expression if it occurs first in the list.
 242          * -- POSIX.2 2.8.3.2
 243          */
 244         ok = 0;
 245         origpat = pattern;
 246         for (;;) {
 247                 if (*pattern == ']' && pattern > origpat) {
 248                         pattern++;
 249                         break;
 250                 } else if (*pattern == '\0') {
 251                         return (RANGE_ERROR);
 252                 } else if (*pattern == '/' && (flags & FNM_PATHNAME)) {
 253                         return (RANGE_NOMATCH);
 254                 } else if (*pattern == '\\' && !(flags & FNM_NOESCAPE))
 255                         pattern++;
 256                 pclen = mbrtowc(&c, pattern, MB_LEN_MAX, patmbs);
 257                 if (pclen == (size_t)-1 || pclen == (size_t)-2)
 258                         return (RANGE_NOMATCH);
 259                 pattern += pclen;
 260
 261                 if (flags & FNM_CASEFOLD)
 262                         c = towlower(c);
 263
 264                 if (*pattern == '-' && *(pattern + 1) != EOS &&
 265                     *(pattern + 1) != ']') {
 266                         if (*++pattern == '\\' && !(flags & FNM_NOESCAPE))
 267                                 if (*pattern != EOS)
 268                                         pattern++;
 269                         pclen = mbrtowc(&c2, pattern, MB_LEN_MAX, patmbs);
 270                         if (pclen == (size_t)-1 || pclen == (size_t)-2)
 271                                 return (RANGE_NOMATCH);
 272                         pattern += pclen;
 273                         if (c2 == EOS)
 274                                 return (RANGE_ERROR);
 275
 276                         if (flags & FNM_CASEFOLD)
 277                                 c2 = towlower(c2);
 278
 279                         if (__collate_load_error ?
 280                             c <= test && test <= c2 :
 281                                __collate_range_cmp(c, test) <= 0
 282                             && __collate_range_cmp(test, c2) <= 0
 283                            )
 284                                 ok = 1;
 285                 } else if (c == test)
 286                         ok = 1;
 287         }
 288
 289         *newp = (char *)pattern;
 290         return (ok == negate ? RANGE_NOMATCH : RANGE_MATCH);
 291 }