lib/libc/gen/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  * Copyright (c) 2011 The FreeBSD Foundation
   9  * All rights reserved.
  10  * Portions of this software were developed by David Chisnall
  11  * under sponsorship from the FreeBSD Foundation.
  12  *
  13  * Redistribution and use in source and binary forms, with or without
  14  * modification, are permitted provided that the following conditions
  15  * are met:
  16  * 1. Redistributions of source code must retain the above copyright
  17  *    notice, this list of conditions and the following disclaimer.
  18  * 2. Redistributions in binary form must reproduce the above copyright
  19  *    notice, this list of conditions and the following disclaimer in the
  20  *    documentation and/or other materials provided with the distribution.
  21  * 3. Neither the name of the University nor the names of its contributors
  22  *    may be used to endorse or promote products derived from this software
  23  *    without specific prior written permission.
  24  *
  25  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  27  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  28  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  30  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  31  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  32  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  33  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  34  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  35  * SUCH DAMAGE.
  36  *
  37  * @(#)fnmatch.c        8.2 (Berkeley) 4/16/94
  38  * $FreeBSD: head/lib/libc/gen/fnmatch.c 254091 2013-08-08 09:04:02Z ache $
  39  */
  40
  41
  42 /*
  43  * Function fnmatch() as specified in POSIX 1003.2-1992, section B.6.
  44  * Compares a filename or pathname to a pattern.
  45  */
  46
  47 /*
  48  * Some notes on multibyte character support:
  49  * 1. Patterns with illegal byte sequences match nothing.
  50  * 2. Illegal byte sequences in the "string" argument are handled by treating
  51  *    them as single-byte characters with a value of the first byte of the
  52  *    sequence cast to wchar_t.
  53  * 3. Multibyte conversion state objects (mbstate_t) are passed around and
  54  *    used for most, but not all, conversions. Further work will be required
  55  *    to support state-dependent encodings.
  56  */
  57
  58 #include <fnmatch.h>
  59 #include <limits.h>
  60 #include <string.h>
  61 #include <wchar.h>
  62 #include <wctype.h>
  63
  64 #include "collate.h"
  65
  66 #define EOS     '\0'
  67
  68 #define RANGE_MATCH     1
  69 #define RANGE_NOMATCH   0
  70 #define RANGE_ERROR     (-1)
  71
  72 static int rangematch(const char *, wchar_t, int, char **, mbstate_t *);
  73 static int fnmatch1(const char *, const char *, const char *, int, mbstate_t,
  74                 mbstate_t);
  75
  76 int
  77 fnmatch(const char *pattern, const char *string, int flags)
  78 {
  79         static const mbstate_t initial;
  80
  81         return (fnmatch1(pattern, string, string, flags, initial, initial));
  82 }
  83
  84 static int
  85 fnmatch1(const char *pattern, const char *string, const char *stringstart,
  86     int flags, mbstate_t patmbs, mbstate_t strmbs)
  87 {
  88         char *newp;
  89         char c;
  90         wchar_t pc, sc;
  91         size_t pclen, sclen;
  92
  93         for (;;) {
  94                 pclen = mbrtowc(&pc, pattern, MB_LEN_MAX, &patmbs);
  95                 if (pclen == (size_t)-1 || pclen == (size_t)-2)
  96                         return (FNM_NOMATCH);
  97                 pattern += pclen;
  98                 sclen = mbrtowc(&sc, string, MB_LEN_MAX, &strmbs);
  99                 if (sclen == (size_t)-1 || sclen == (size_t)-2) {
 100                         sc = (unsigned char)*string;
 101                         sclen = 1;
 102                         memset(&strmbs, 0, sizeof(strmbs));
 103                 }
 104                 switch (pc) {
 105                 case EOS:
 106                         if ((flags & FNM_LEADING_DIR) && sc == '/')
 107                                 return (0);
 108                         return (sc == EOS ? 0 : FNM_NOMATCH);
 109                 case '?':
 110                         if (sc == EOS)
 111                                 return (FNM_NOMATCH);
 112                         if (sc == '/' && (flags & FNM_PATHNAME))
 113                                 return (FNM_NOMATCH);
 114                         if (sc == '.' && (flags & FNM_PERIOD) &&
 115                             (string == stringstart ||
 116                             ((flags & FNM_PATHNAME) && *(string - 1) == '/')))
 117                                 return (FNM_NOMATCH);
 118                         string += sclen;
 119                         break;
 120                 case '*':
 121                         c = *pattern;
 122                         /* Collapse multiple stars. */
 123                         while (c == '*')
 124                                 c = *++pattern;
 125
 126                         if (sc == '.' && (flags & FNM_PERIOD) &&
 127                             (string == stringstart ||
 128                             ((flags & FNM_PATHNAME) && *(string - 1) == '/')))
 129                                 return (FNM_NOMATCH);
 130
 131                         /* Optimize for pattern with * at end or before /. */
 132                         if (c == EOS)
 133                                 if (flags & FNM_PATHNAME)
 134                                         return ((flags & FNM_LEADING_DIR) ||
 135                                             strchr(string, '/') == NULL ?
 136                                             0 : FNM_NOMATCH);
 137                                 else
 138                                         return (0);
 139                         else if (c == '/' && flags & FNM_PATHNAME) {
 140                                 if ((string = strchr(string, '/')) == NULL)
 141                                         return (FNM_NOMATCH);
 142                                 break;
 143                         }
 144
 145                         /* General case, use recursion. */
 146                         while (sc != EOS) {
 147                                 if (!fnmatch1(pattern, string, stringstart,
 148                                     flags, patmbs, strmbs))
 149                                         return (0);
 150                                 sclen = mbrtowc(&sc, string, MB_LEN_MAX,
 151                                     &strmbs);
 152                                 if (sclen == (size_t)-1 ||
 153                                     sclen == (size_t)-2) {
 154                                         sc = (unsigned char)*string;
 155                                         sclen = 1;
 156                                         memset(&strmbs, 0, sizeof(strmbs));
 157                                 }
 158                                 if (sc == '/' && flags & FNM_PATHNAME)
 159                                         break;
 160                                 string += sclen;
 161                         }
 162                         return (FNM_NOMATCH);
 163                 case '[':
 164                         if (sc == EOS)
 165                                 return (FNM_NOMATCH);
 166                         if (sc == '/' && (flags & FNM_PATHNAME))
 167                                 return (FNM_NOMATCH);
 168                         if (sc == '.' && (flags & FNM_PERIOD) &&
 169                             (string == stringstart ||
 170                             ((flags & FNM_PATHNAME) && *(string - 1) == '/')))
 171                                 return (FNM_NOMATCH);
 172
 173                         switch (rangematch(pattern, sc, flags, &newp,
 174                             &patmbs)) {
 175                         case RANGE_ERROR:
 176                                 goto norm;
 177                         case RANGE_MATCH:
 178                                 pattern = newp;
 179                                 break;
 180                         case RANGE_NOMATCH:
 181                                 return (FNM_NOMATCH);
 182                         }
 183                         string += sclen;
 184                         break;
 185                 case '\\':
 186                         if (!(flags & FNM_NOESCAPE)) {
 187                                 pclen = mbrtowc(&pc, pattern, MB_LEN_MAX,
 188                                     &patmbs);
 189                                 if (pclen == (size_t)-1 || pclen == (size_t)-2)
 190                                         return (FNM_NOMATCH);
 191                                 pattern += pclen;
 192                         }
 193                         /* FALLTHROUGH */
 194                 default:
 195                 norm:
 196                         if (pc == sc)
 197                                 ;
 198                         else if ((flags & FNM_CASEFOLD) &&
 199                                  (towlower(pc) == towlower(sc)))
 200                                 ;
 201                         else
 202                                 return (FNM_NOMATCH);
 203                         string += sclen;
 204                         break;
 205                 }
 206         }
 207         /* NOTREACHED */
 208 }
 209
 210 static int
 211 rangematch(const char *pattern, wchar_t test, int flags, char **newp,
 212     mbstate_t *patmbs)
 213 {
 214         int negate, ok;
 215         wchar_t c, c2;
 216         size_t pclen;
 217         const char *origpat;
 218         struct xlocale_collate *table =
 219                 (struct xlocale_collate*)__get_locale()->components[XLC_COLLATE];
 220
 221         /*
 222          * A bracket expression starting with an unquoted circumflex
 223          * character produces unspecified results (IEEE 1003.2-1992,
 224          * 3.13.2).  This implementation treats it like '!', for
 225          * consistency with the regular expression syntax.
 226          * J.T. Conklin (conklin@ngai.kaleida.com)
 227          */
 228         if ((negate = (*pattern == '!' || *pattern == '^')))
 229                 ++pattern;
 230
 231         if (flags & FNM_CASEFOLD)
 232                 test = towlower(test);
 233
 234         /*
 235          * A right bracket shall lose its special meaning and represent
 236          * itself in a bracket expression if it occurs first in the list.
 237          * -- POSIX.2 2.8.3.2
 238          */
 239         ok = 0;
 240         origpat = pattern;
 241         for (;;) {
 242                 if (*pattern == ']' && pattern > origpat) {
 243                         pattern++;
 244                         break;
 245                 } else if (*pattern == '\0') {
 246                         return (RANGE_ERROR);
 247                 } else if (*pattern == '/' && (flags & FNM_PATHNAME)) {
 248                         return (RANGE_NOMATCH);
 249                 } else if (*pattern == '\\' && !(flags & FNM_NOESCAPE))
 250                         pattern++;
 251                 pclen = mbrtowc(&c, pattern, MB_LEN_MAX, patmbs);
 252                 if (pclen == (size_t)-1 || pclen == (size_t)-2)
 253                         return (RANGE_NOMATCH);
 254                 pattern += pclen;
 255
 256                 if (flags & FNM_CASEFOLD)
 257                         c = towlower(c);
 258
 259                 if (*pattern == '-' && *(pattern + 1) != EOS &&
 260                     *(pattern + 1) != ']') {
 261                         if (*++pattern == '\\' && !(flags & FNM_NOESCAPE))
 262                                 if (*pattern != EOS)
 263                                         pattern++;
 264                         pclen = mbrtowc(&c2, pattern, MB_LEN_MAX, patmbs);
 265                         if (pclen == (size_t)-1 || pclen == (size_t)-2)
 266                                 return (RANGE_NOMATCH);
 267                         pattern += pclen;
 268                         if (c2 == EOS)
 269                                 return (RANGE_ERROR);
 270
 271                         if (flags & FNM_CASEFOLD)
 272                                 c2 = towlower(c2);
 273
 274                         if (table->__collate_load_error ?
 275                             c <= test && test <= c2 :
 276                                __wcollate_range_cmp(c, test) <= 0
 277                             && __wcollate_range_cmp(test, c2) <= 0
 278                            )
 279                                 ok = 1;
 280                 } else if (c == test)
 281                         ok = 1;
 282         }
 283
 284         *newp = (char *)pattern;
 285         return (ok == negate ? RANGE_NOMATCH : RANGE_MATCH);
 286 }