Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/libkern/fnmatch.c
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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 37 #include <sys/cdefs.h> 38 __FBSDID("$FreeBSD: releng/5.2/sys/libkern/fnmatch.c 116189 2003-06-11 05:37:42Z obrien $"); 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 static int rangematch(const char *, char, int, char **); 56 57 int 58 fnmatch(pattern, string, flags) 59 const char *pattern, *string; 60 int flags; 61 { 62 const char *stringstart; 63 char *newp; 64 char c, test; 65 66 for (stringstart = string;;) 67 switch (c = *pattern++) { 68 case EOS: 69 if ((flags & FNM_LEADING_DIR) && *string == '/') 70 return (0); 71 return (*string == EOS ? 0 : FNM_NOMATCH); 72 case '?': 73 if (*string == EOS) 74 return (FNM_NOMATCH); 75 if (*string == '/' && (flags & FNM_PATHNAME)) 76 return (FNM_NOMATCH); 77 if (*string == '.' && (flags & FNM_PERIOD) && 78 (string == stringstart || 79 ((flags & FNM_PATHNAME) && *(string - 1) == '/'))) 80 return (FNM_NOMATCH); 81 ++string; 82 break; 83 case '*': 84 c = *pattern; 85 /* Collapse multiple stars. */ 86 while (c == '*') 87 c = *++pattern; 88 89 if (*string == '.' && (flags & FNM_PERIOD) && 90 (string == stringstart || 91 ((flags & FNM_PATHNAME) && *(string - 1) == '/'))) 92 return (FNM_NOMATCH); 93 94 /* Optimize for pattern with * at end or before /. */ 95 if (c == EOS) 96 if (flags & FNM_PATHNAME) 97 return ((flags & FNM_LEADING_DIR) || 98 index(string, '/') == NULL ? 99 0 : FNM_NOMATCH); 100 else 101 return (0); 102 else if (c == '/' && flags & FNM_PATHNAME) { 103 if ((string = index(string, '/')) == NULL) 104 return (FNM_NOMATCH); 105 break; 106 } 107 108 /* General case, use recursion. */ 109 while ((test = *string) != EOS) { 110 if (!fnmatch(pattern, string, flags & ~FNM_PERIOD)) 111 return (0); 112 if (test == '/' && flags & FNM_PATHNAME) 113 break; 114 ++string; 115 } 116 return (FNM_NOMATCH); 117 case '[': 118 if (*string == EOS) 119 return (FNM_NOMATCH); 120 if (*string == '/' && (flags & FNM_PATHNAME)) 121 return (FNM_NOMATCH); 122 if (*string == '.' && (flags & FNM_PERIOD) && 123 (string == stringstart || 124 ((flags & FNM_PATHNAME) && *(string - 1) == '/'))) 125 return (FNM_NOMATCH); 126 127 switch (rangematch(pattern, *string, flags, &newp)) { 128 case RANGE_ERROR: 129 goto norm; 130 case RANGE_MATCH: 131 pattern = newp; 132 break; 133 case RANGE_NOMATCH: 134 return (FNM_NOMATCH); 135 } 136 ++string; 137 break; 138 case '\\': 139 if (!(flags & FNM_NOESCAPE)) { 140 if ((c = *pattern++) == EOS) { 141 c = '\\'; 142 --pattern; 143 } 144 } 145 /* FALLTHROUGH */ 146 default: 147 norm: 148 if (c == *string) 149 ; 150 else if ((flags & FNM_CASEFOLD) && 151 (tolower((unsigned char)c) == 152 tolower((unsigned char)*string))) 153 ; 154 else 155 return (FNM_NOMATCH); 156 string++; 157 break; 158 } 159 /* NOTREACHED */ 160 } 161 162 static int 163 rangematch(pattern, test, flags, newp) 164 const char *pattern; 165 char test; 166 int flags; 167 char **newp; 168 { 169 int negate, ok; 170 char c, c2; 171 172 /* 173 * A bracket expression starting with an unquoted circumflex 174 * character produces unspecified results (IEEE 1003.2-1992, 175 * 3.13.2). This implementation treats it like '!', for 176 * consistency with the regular expression syntax. 177 * J.T. Conklin (conklin@ngai.kaleida.com) 178 */ 179 if ( (negate = (*pattern == '!' || *pattern == '^')) ) 180 ++pattern; 181 182 if (flags & FNM_CASEFOLD) 183 test = tolower((unsigned char)test); 184 185 /* 186 * A right bracket shall lose its special meaning and represent 187 * itself in a bracket expression if it occurs first in the list. 188 * -- POSIX.2 2.8.3.2 189 */ 190 ok = 0; 191 c = *pattern++; 192 do { 193 if (c == '\\' && !(flags & FNM_NOESCAPE)) 194 c = *pattern++; 195 if (c == EOS) 196 return (RANGE_ERROR); 197 198 if (c == '/' && (flags & FNM_PATHNAME)) 199 return (RANGE_NOMATCH); 200 201 if (flags & FNM_CASEFOLD) 202 c = tolower((unsigned char)c); 203 204 if (*pattern == '-' 205 && (c2 = *(pattern+1)) != EOS && c2 != ']') { 206 pattern += 2; 207 if (c2 == '\\' && !(flags & FNM_NOESCAPE)) 208 c2 = *pattern++; 209 if (c2 == EOS) 210 return (RANGE_ERROR); 211 212 if (flags & FNM_CASEFOLD) 213 c2 = tolower((unsigned char)c2); 214 215 if (c <= test && test <= c2) 216 ok = 1; 217 } else if (c == test) 218 ok = 1; 219 } while ((c = *pattern++) != ']'); 220 221 *newp = (char *)(uintptr_t)pattern; 222 return (ok == negate ? RANGE_NOMATCH : RANGE_MATCH); 223 }
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