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 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * $FreeBSD: src/sys/libkern/fnmatch.c,v 1.17 2003/06/11 05:23:04 obrien Exp $ 37 * $DragonFly: src/sys/libkern/fnmatch.c,v 1.2 2004/01/06 01:05:52 dillon Exp $ 38 */ 39 40 /* 41 * Function fnmatch() as specified in POSIX 1003.2-1992, section B.6. 42 * Compares a filename or pathname to a pattern. 43 */ 44 45 #include <sys/param.h> 46 #include <sys/ctype.h> 47 #include <sys/libkern.h> 48 49 #define EOS '\0' 50 51 #define RANGE_MATCH 1 52 #define RANGE_NOMATCH 0 53 #define RANGE_ERROR (-1) 54 55 #define MAXNEST 20 56 57 static int rangematch(const char *, char, int, char **); 58 59 int 60 _fnmatch(const char *pattern, const char *string, int flags, int nesting) 61 { 62 const char *stringstart; 63 char *newp; 64 char c, test; 65 66 if (nesting == MAXNEST) 67 return (FNM_NOMATCH); 68 69 for (stringstart = string;;) { 70 switch (c = *pattern++) { 71 case EOS: 72 if ((flags & FNM_LEADING_DIR) && *string == '/') 73 return (0); 74 return (*string == EOS ? 0 : FNM_NOMATCH); 75 case '?': 76 if (*string == EOS) 77 return (FNM_NOMATCH); 78 if (*string == '/' && (flags & FNM_PATHNAME)) 79 return (FNM_NOMATCH); 80 if (*string == '.' && (flags & FNM_PERIOD) && 81 (string == stringstart || 82 ((flags & FNM_PATHNAME) && *(string - 1) == '/'))) { 83 return (FNM_NOMATCH); 84 } 85 ++string; 86 break; 87 case '*': 88 c = *pattern; 89 /* Collapse multiple stars. */ 90 while (c == '*') 91 c = *++pattern; 92 93 if (*string == '.' && (flags & FNM_PERIOD) && 94 (string == stringstart || 95 ((flags & FNM_PATHNAME) && *(string - 1) == '/'))) { 96 return (FNM_NOMATCH); 97 } 98 99 /* Optimize for pattern with * at end or before /. */ 100 if (c == EOS) { 101 if (flags & FNM_PATHNAME) { 102 return ((flags & FNM_LEADING_DIR) || 103 index(string, '/') == NULL ? 104 0 : FNM_NOMATCH); 105 } else { 106 return (0); 107 } 108 } else if (c == '/' && flags & FNM_PATHNAME) { 109 if ((string = index(string, '/')) == NULL) 110 return (FNM_NOMATCH); 111 break; 112 } 113 114 /* General case, use recursion. */ 115 while ((test = *string) != EOS) { 116 if (!_fnmatch(pattern, string, flags & ~FNM_PERIOD, nesting + 1)) 117 return (0); 118 if (test == '/' && flags & FNM_PATHNAME) 119 break; 120 ++string; 121 } 122 return (FNM_NOMATCH); 123 case '[': 124 if (*string == EOS) 125 return (FNM_NOMATCH); 126 if (*string == '/' && (flags & FNM_PATHNAME)) 127 return (FNM_NOMATCH); 128 if (*string == '.' && (flags & FNM_PERIOD) && 129 (string == stringstart || 130 ((flags & FNM_PATHNAME) && *(string - 1) == '/'))) 131 return (FNM_NOMATCH); 132 133 switch (rangematch(pattern, *string, flags, &newp)) { 134 case RANGE_ERROR: 135 goto norm; 136 case RANGE_MATCH: 137 pattern = newp; 138 break; 139 case RANGE_NOMATCH: 140 return (FNM_NOMATCH); 141 } 142 ++string; 143 break; 144 case '\\': 145 if (!(flags & FNM_NOESCAPE)) { 146 if ((c = *pattern++) == EOS) { 147 c = '\\'; 148 --pattern; 149 } 150 } 151 /* FALLTHROUGH */ 152 default: 153 norm: 154 if (c == *string) { 155 ; 156 } else if ((flags & FNM_CASEFOLD) && 157 (tolower((unsigned char)c) == 158 tolower((unsigned char)*string))) { 159 ; 160 } else { 161 return (FNM_NOMATCH); 162 } 163 string++; 164 break; 165 } 166 } 167 /* NOTREACHED */ 168 } 169 170 static int 171 rangematch(const char *pattern, char test, int flags, char **newp) 172 { 173 int negate, ok; 174 char c, c2; 175 176 /* 177 * A bracket expression starting with an unquoted circumflex 178 * character produces unspecified results (IEEE 1003.2-1992, 179 * 3.13.2). This implementation treats it like '!', for 180 * consistency with the regular expression syntax. 181 * J.T. Conklin (conklin@ngai.kaleida.com) 182 */ 183 if ((negate = (*pattern == '!' || *pattern == '^')) != 0) 184 ++pattern; 185 186 if (flags & FNM_CASEFOLD) 187 test = tolower((unsigned char)test); 188 189 /* 190 * A right bracket shall lose its special meaning and represent 191 * itself in a bracket expression if it occurs first in the list. 192 * -- POSIX.2 2.8.3.2 193 */ 194 ok = 0; 195 c = *pattern++; 196 do { 197 if (c == '\\' && !(flags & FNM_NOESCAPE)) 198 c = *pattern++; 199 if (c == EOS) 200 return (RANGE_ERROR); 201 202 if (c == '/' && (flags & FNM_PATHNAME)) 203 return (RANGE_NOMATCH); 204 205 if (flags & FNM_CASEFOLD) 206 c = tolower((unsigned char)c); 207 208 if (*pattern == '-' 209 && (c2 = *(pattern+1)) != EOS && c2 != ']') { 210 pattern += 2; 211 if (c2 == '\\' && !(flags & FNM_NOESCAPE)) 212 c2 = *pattern++; 213 if (c2 == EOS) 214 return (RANGE_ERROR); 215 216 if (flags & FNM_CASEFOLD) 217 c2 = tolower((unsigned char)c2); 218 219 if (c <= test && test <= c2) 220 ok = 1; 221 } else if (c == test) { 222 ok = 1; 223 } 224 } while ((c = *pattern++) != ']'); 225 226 *newp = (char *)(uintptr_t)pattern; 227 return (ok == negate ? RANGE_NOMATCH : RANGE_MATCH); 228 } 229 230