fnmatch.c revision 227753
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 * 4. 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 38#if defined(LIBC_SCCS) && !defined(lint) 39static char sccsid[] = "@(#)fnmatch.c 8.2 (Berkeley) 4/16/94"; 40#endif /* LIBC_SCCS and not lint */ 41#include <sys/cdefs.h> 42__FBSDID("$FreeBSD: head/lib/libc/gen/fnmatch.c 227753 2011-11-20 14:45:42Z theraven $"); 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/* 50 * Some notes on multibyte character support: 51 * 1. Patterns with illegal byte sequences match nothing. 52 * 2. Illegal byte sequences in the "string" argument are handled by treating 53 * them as single-byte characters with a value of the first byte of the 54 * sequence cast to wchar_t. 55 * 3. Multibyte conversion state objects (mbstate_t) are passed around and 56 * used for most, but not all, conversions. Further work will be required 57 * to support state-dependent encodings. 58 */ 59 60#include <fnmatch.h> 61#include <limits.h> 62#include <string.h> 63#include <wchar.h> 64#include <wctype.h> 65 66#include "collate.h" 67 68#define EOS '\0' 69 70#define RANGE_MATCH 1 71#define RANGE_NOMATCH 0 72#define RANGE_ERROR (-1) 73 74static int rangematch(const char *, wchar_t, int, char **, mbstate_t *); 75static int fnmatch1(const char *, const char *, const char *, int, mbstate_t, 76 mbstate_t); 77 78int 79fnmatch(pattern, string, flags) 80 const char *pattern, *string; 81 int flags; 82{ 83 static const mbstate_t initial; 84 85 return (fnmatch1(pattern, string, string, flags, initial, initial)); 86} 87 88static int 89fnmatch1(pattern, string, stringstart, flags, patmbs, strmbs) 90 const char *pattern, *string, *stringstart; 91 int flags; 92 mbstate_t patmbs, strmbs; 93{ 94 char *newp; 95 char c; 96 wchar_t pc, sc; 97 size_t pclen, sclen; 98 99 for (;;) { 100 pclen = mbrtowc(&pc, pattern, MB_LEN_MAX, &patmbs); 101 if (pclen == (size_t)-1 || pclen == (size_t)-2) 102 return (FNM_NOMATCH); 103 pattern += pclen; 104 sclen = mbrtowc(&sc, string, MB_LEN_MAX, &strmbs); 105 if (sclen == (size_t)-1 || sclen == (size_t)-2) { 106 sc = (unsigned char)*string; 107 sclen = 1; 108 memset(&strmbs, 0, sizeof(strmbs)); 109 } 110 switch (pc) { 111 case EOS: 112 if ((flags & FNM_LEADING_DIR) && sc == '/') 113 return (0); 114 return (sc == EOS ? 0 : FNM_NOMATCH); 115 case '?': 116 if (sc == EOS) 117 return (FNM_NOMATCH); 118 if (sc == '/' && (flags & FNM_PATHNAME)) 119 return (FNM_NOMATCH); 120 if (sc == '.' && (flags & FNM_PERIOD) && 121 (string == stringstart || 122 ((flags & FNM_PATHNAME) && *(string - 1) == '/'))) 123 return (FNM_NOMATCH); 124 string += sclen; 125 break; 126 case '*': 127 c = *pattern; 128 /* Collapse multiple stars. */ 129 while (c == '*') 130 c = *++pattern; 131 132 if (sc == '.' && (flags & FNM_PERIOD) && 133 (string == stringstart || 134 ((flags & FNM_PATHNAME) && *(string - 1) == '/'))) 135 return (FNM_NOMATCH); 136 137 /* Optimize for pattern with * at end or before /. */ 138 if (c == EOS) 139 if (flags & FNM_PATHNAME) 140 return ((flags & FNM_LEADING_DIR) || 141 strchr(string, '/') == NULL ? 142 0 : FNM_NOMATCH); 143 else 144 return (0); 145 else if (c == '/' && flags & FNM_PATHNAME) { 146 if ((string = strchr(string, '/')) == NULL) 147 return (FNM_NOMATCH); 148 break; 149 } 150 151 /* General case, use recursion. */ 152 while (sc != EOS) { 153 if (!fnmatch1(pattern, string, stringstart, 154 flags, patmbs, strmbs)) 155 return (0); 156 sclen = mbrtowc(&sc, string, MB_LEN_MAX, 157 &strmbs); 158 if (sclen == (size_t)-1 || 159 sclen == (size_t)-2) { 160 sc = (unsigned char)*string; 161 sclen = 1; 162 memset(&strmbs, 0, sizeof(strmbs)); 163 } 164 if (sc == '/' && flags & FNM_PATHNAME) 165 break; 166 string += sclen; 167 } 168 return (FNM_NOMATCH); 169 case '[': 170 if (sc == EOS) 171 return (FNM_NOMATCH); 172 if (sc == '/' && (flags & FNM_PATHNAME)) 173 return (FNM_NOMATCH); 174 if (sc == '.' && (flags & FNM_PERIOD) && 175 (string == stringstart || 176 ((flags & FNM_PATHNAME) && *(string - 1) == '/'))) 177 return (FNM_NOMATCH); 178 179 switch (rangematch(pattern, sc, flags, &newp, 180 &patmbs)) { 181 case RANGE_ERROR: 182 goto norm; 183 case RANGE_MATCH: 184 pattern = newp; 185 break; 186 case RANGE_NOMATCH: 187 return (FNM_NOMATCH); 188 } 189 string += sclen; 190 break; 191 case '\\': 192 if (!(flags & FNM_NOESCAPE)) { 193 pclen = mbrtowc(&pc, pattern, MB_LEN_MAX, 194 &patmbs); 195 if (pclen == (size_t)-1 || pclen == (size_t)-2) 196 return (FNM_NOMATCH); 197 if (pclen == 0) 198 pc = '\\'; 199 pattern += pclen; 200 } 201 /* FALLTHROUGH */ 202 default: 203 norm: 204 if (pc == sc) 205 ; 206 else if ((flags & FNM_CASEFOLD) && 207 (towlower(pc) == towlower(sc))) 208 ; 209 else 210 return (FNM_NOMATCH); 211 string += sclen; 212 break; 213 } 214 } 215 /* NOTREACHED */ 216} 217 218static int 219rangematch(pattern, test, flags, newp, patmbs) 220 const char *pattern; 221 wchar_t test; 222 int flags; 223 char **newp; 224 mbstate_t *patmbs; 225{ 226 int negate, ok; 227 wchar_t c, c2; 228 size_t pclen; 229 const char *origpat; 230 struct xlocale_collate *table = 231 (struct xlocale_collate*)__get_locale()->components[XLC_COLLATE]; 232 233 /* 234 * A bracket expression starting with an unquoted circumflex 235 * character produces unspecified results (IEEE 1003.2-1992, 236 * 3.13.2). This implementation treats it like '!', for 237 * consistency with the regular expression syntax. 238 * J.T. Conklin (conklin@ngai.kaleida.com) 239 */ 240 if ( (negate = (*pattern == '!' || *pattern == '^')) ) 241 ++pattern; 242 243 if (flags & FNM_CASEFOLD) 244 test = towlower(test); 245 246 /* 247 * A right bracket shall lose its special meaning and represent 248 * itself in a bracket expression if it occurs first in the list. 249 * -- POSIX.2 2.8.3.2 250 */ 251 ok = 0; 252 origpat = pattern; 253 for (;;) { 254 if (*pattern == ']' && pattern > origpat) { 255 pattern++; 256 break; 257 } else if (*pattern == '\0') { 258 return (RANGE_ERROR); 259 } else if (*pattern == '/' && (flags & FNM_PATHNAME)) { 260 return (RANGE_NOMATCH); 261 } else if (*pattern == '\\' && !(flags & FNM_NOESCAPE)) 262 pattern++; 263 pclen = mbrtowc(&c, pattern, MB_LEN_MAX, patmbs); 264 if (pclen == (size_t)-1 || pclen == (size_t)-2) 265 return (RANGE_NOMATCH); 266 pattern += pclen; 267 268 if (flags & FNM_CASEFOLD) 269 c = towlower(c); 270 271 if (*pattern == '-' && *(pattern + 1) != EOS && 272 *(pattern + 1) != ']') { 273 if (*++pattern == '\\' && !(flags & FNM_NOESCAPE)) 274 if (*pattern != EOS) 275 pattern++; 276 pclen = mbrtowc(&c2, pattern, MB_LEN_MAX, patmbs); 277 if (pclen == (size_t)-1 || pclen == (size_t)-2) 278 return (RANGE_NOMATCH); 279 pattern += pclen; 280 if (c2 == EOS) 281 return (RANGE_ERROR); 282 283 if (flags & FNM_CASEFOLD) 284 c2 = towlower(c2); 285 286 if (table->__collate_load_error ? 287 c <= test && test <= c2 : 288 __collate_range_cmp(table, c, test) <= 0 289 && __collate_range_cmp(table, test, c2) <= 0 290 ) 291 ok = 1; 292 } else if (c == test) 293 ok = 1; 294 } 295 296 *newp = (char *)pattern; 297 return (ok == negate ? RANGE_NOMATCH : RANGE_MATCH); 298} 299