fnmatch.c revision 206711
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) 34static 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: head/lib/libc/gen/fnmatch.c 206711 2010-04-16 22:29:24Z jilles $"); 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 69static int rangematch(const char *, wchar_t, int, char **, mbstate_t *); 70static int fnmatch1(const char *, const char *, const char *, int, mbstate_t, 71 mbstate_t); 72 73int 74fnmatch(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 83static int 84fnmatch1(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 213static int 214rangematch(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} 292