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
Version:
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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 * $FreeBSD: releng/5.0/sys/libkern/fnmatch.c 104652 2002-10-08 04:15:55Z dd $ 37 */ 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 #include <sys/param.h> 45 #include <sys/ctype.h> 46 #include <sys/libkern.h> 47 48 #define EOS '\0' 49 50 #define RANGE_MATCH 1 51 #define RANGE_NOMATCH 0 52 #define RANGE_ERROR (-1) 53 54 static int rangematch(const char *, char, int, char **); 55 56 int 57 fnmatch(pattern, string, flags) 58 const char *pattern, *string; 59 int flags; 60 { 61 const char *stringstart; 62 char *newp; 63 char c, test; 64 65 for (stringstart = string;;) 66 switch (c = *pattern++) { 67 case EOS: 68 if ((flags & FNM_LEADING_DIR) && *string == '/') 69 return (0); 70 return (*string == EOS ? 0 : FNM_NOMATCH); 71 case '?': 72 if (*string == EOS) 73 return (FNM_NOMATCH); 74 if (*string == '/' && (flags & FNM_PATHNAME)) 75 return (FNM_NOMATCH); 76 if (*string == '.' && (flags & FNM_PERIOD) && 77 (string == stringstart || 78 ((flags & FNM_PATHNAME) && *(string - 1) == '/'))) 79 return (FNM_NOMATCH); 80 ++string; 81 break; 82 case '*': 83 c = *pattern; 84 /* Collapse multiple stars. */ 85 while (c == '*') 86 c = *++pattern; 87 88 if (*string == '.' && (flags & FNM_PERIOD) && 89 (string == stringstart || 90 ((flags & FNM_PATHNAME) && *(string - 1) == '/'))) 91 return (FNM_NOMATCH); 92 93 /* Optimize for pattern with * at end or before /. */ 94 if (c == EOS) 95 if (flags & FNM_PATHNAME) 96 return ((flags & FNM_LEADING_DIR) || 97 index(string, '/') == NULL ? 98 0 : FNM_NOMATCH); 99 else 100 return (0); 101 else if (c == '/' && flags & FNM_PATHNAME) { 102 if ((string = index(string, '/')) == NULL) 103 return (FNM_NOMATCH); 104 break; 105 } 106 107 /* General case, use recursion. */ 108 while ((test = *string) != EOS) { 109 if (!fnmatch(pattern, string, flags & ~FNM_PERIOD)) 110 return (0); 111 if (test == '/' && flags & FNM_PATHNAME) 112 break; 113 ++string; 114 } 115 return (FNM_NOMATCH); 116 case '[': 117 if (*string == EOS) 118 return (FNM_NOMATCH); 119 if (*string == '/' && (flags & FNM_PATHNAME)) 120 return (FNM_NOMATCH); 121 if (*string == '.' && (flags & FNM_PERIOD) && 122 (string == stringstart || 123 ((flags & FNM_PATHNAME) && *(string - 1) == '/'))) 124 return (FNM_NOMATCH); 125 126 switch (rangematch(pattern, *string, flags, &newp)) { 127 case RANGE_ERROR: 128 goto norm; 129 case RANGE_MATCH: 130 pattern = newp; 131 break; 132 case RANGE_NOMATCH: 133 return (FNM_NOMATCH); 134 } 135 ++string; 136 break; 137 case '\\': 138 if (!(flags & FNM_NOESCAPE)) { 139 if ((c = *pattern++) == EOS) { 140 c = '\\'; 141 --pattern; 142 } 143 } 144 /* FALLTHROUGH */ 145 default: 146 norm: 147 if (c == *string) 148 ; 149 else if ((flags & FNM_CASEFOLD) && 150 (tolower((unsigned char)c) == 151 tolower((unsigned char)*string))) 152 ; 153 else 154 return (FNM_NOMATCH); 155 string++; 156 break; 157 } 158 /* NOTREACHED */ 159 } 160 161 static int 162 rangematch(pattern, test, flags, newp) 163 const char *pattern; 164 char test; 165 int flags; 166 char **newp; 167 { 168 int negate, ok; 169 char c, c2; 170 171 /* 172 * A bracket expression starting with an unquoted circumflex 173 * character produces unspecified results (IEEE 1003.2-1992, 174 * 3.13.2). This implementation treats it like '!', for 175 * consistency with the regular expression syntax. 176 * J.T. Conklin (conklin@ngai.kaleida.com) 177 */ 178 if ( (negate = (*pattern == '!' || *pattern == '^')) ) 179 ++pattern; 180 181 if (flags & FNM_CASEFOLD) 182 test = tolower((unsigned char)test); 183 184 /* 185 * A right bracket shall lose its special meaning and represent 186 * itself in a bracket expression if it occurs first in the list. 187 * -- POSIX.2 2.8.3.2 188 */ 189 ok = 0; 190 c = *pattern++; 191 do { 192 if (c == '\\' && !(flags & FNM_NOESCAPE)) 193 c = *pattern++; 194 if (c == EOS) 195 return (RANGE_ERROR); 196 197 if (c == '/' && (flags & FNM_PATHNAME)) 198 return (RANGE_NOMATCH); 199 200 if (flags & FNM_CASEFOLD) 201 c = tolower((unsigned char)c); 202 203 if (*pattern == '-' 204 && (c2 = *(pattern+1)) != EOS && c2 != ']') { 205 pattern += 2; 206 if (c2 == '\\' && !(flags & FNM_NOESCAPE)) 207 c2 = *pattern++; 208 if (c2 == EOS) 209 return (RANGE_ERROR); 210 211 if (flags & FNM_CASEFOLD) 212 c2 = tolower((unsigned char)c2); 213 214 if (c <= test && test <= c2) 215 ok = 1; 216 } else if (c == test) 217 ok = 1; 218 } while ((c = *pattern++) != ']'); 219 220 *newp = (char *)(uintptr_t)pattern; 221 return (ok == negate ? RANGE_NOMATCH : RANGE_MATCH); 222 }
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