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:
- FREEBSD - FREEBSD-13-STABLE - FREEBSD-13-0 - FREEBSD-12-STABLE - FREEBSD-12-0 - FREEBSD-11-STABLE - FREEBSD-11-0 - FREEBSD-10-STABLE - FREEBSD-10-0 - FREEBSD-9-STABLE - FREEBSD-9-0 - FREEBSD-8-STABLE - FREEBSD-8-0 - FREEBSD-7-STABLE - FREEBSD-7-0 - FREEBSD-6-STABLE - FREEBSD-6-0 - FREEBSD-5-STABLE - FREEBSD-5-0 - FREEBSD-4-STABLE - FREEBSD-3-STABLE - FREEBSD22 - l41 - OPENBSD - linux-2.6 - MK84 - PLAN9 - xnu-8792
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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 * 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 #include <sys/cdefs.h> 34 __FBSDID("$FreeBSD$"); 35 36 /* 37 * Function fnmatch() as specified in POSIX 1003.2-1992, section B.6. 38 * Compares a filename or pathname to a pattern. 39 */ 40 41 #include <sys/param.h> 42 #include <sys/ctype.h> 43 #include <sys/libkern.h> 44 45 #define EOS '\0' 46 47 #define RANGE_MATCH 1 48 #define RANGE_NOMATCH 0 49 #define RANGE_ERROR (-1) 50 51 static int rangematch(const char *, char, int, char **); 52 53 int 54 fnmatch(const char *pattern, const char *string, int flags) 55 { 56 const char *stringstart; 57 char *newp; 58 char c, test; 59 60 for (stringstart = string;;) 61 switch (c = *pattern++) { 62 case EOS: 63 if ((flags & FNM_LEADING_DIR) && *string == '/') 64 return (0); 65 return (*string == EOS ? 0 : FNM_NOMATCH); 66 case '?': 67 if (*string == EOS) 68 return (FNM_NOMATCH); 69 if (*string == '/' && (flags & FNM_PATHNAME)) 70 return (FNM_NOMATCH); 71 if (*string == '.' && (flags & FNM_PERIOD) && 72 (string == stringstart || 73 ((flags & FNM_PATHNAME) && *(string - 1) == '/'))) 74 return (FNM_NOMATCH); 75 ++string; 76 break; 77 case '*': 78 c = *pattern; 79 /* Collapse multiple stars. */ 80 while (c == '*') 81 c = *++pattern; 82 83 if (*string == '.' && (flags & FNM_PERIOD) && 84 (string == stringstart || 85 ((flags & FNM_PATHNAME) && *(string - 1) == '/'))) 86 return (FNM_NOMATCH); 87 88 /* Optimize for pattern with * at end or before /. */ 89 if (c == EOS) 90 if (flags & FNM_PATHNAME) 91 return ((flags & FNM_LEADING_DIR) || 92 index(string, '/') == NULL ? 93 0 : FNM_NOMATCH); 94 else 95 return (0); 96 else if (c == '/' && flags & FNM_PATHNAME) { 97 if ((string = index(string, '/')) == NULL) 98 return (FNM_NOMATCH); 99 break; 100 } 101 102 /* General case, use recursion. */ 103 while ((test = *string) != EOS) { 104 if (!fnmatch(pattern, string, flags & ~FNM_PERIOD)) 105 return (0); 106 if (test == '/' && flags & FNM_PATHNAME) 107 break; 108 ++string; 109 } 110 return (FNM_NOMATCH); 111 case '[': 112 if (*string == EOS) 113 return (FNM_NOMATCH); 114 if (*string == '/' && (flags & FNM_PATHNAME)) 115 return (FNM_NOMATCH); 116 if (*string == '.' && (flags & FNM_PERIOD) && 117 (string == stringstart || 118 ((flags & FNM_PATHNAME) && *(string - 1) == '/'))) 119 return (FNM_NOMATCH); 120 121 switch (rangematch(pattern, *string, flags, &newp)) { 122 case RANGE_ERROR: 123 goto norm; 124 case RANGE_MATCH: 125 pattern = newp; 126 break; 127 case RANGE_NOMATCH: 128 return (FNM_NOMATCH); 129 } 130 ++string; 131 break; 132 case '\\': 133 if (!(flags & FNM_NOESCAPE)) { 134 if ((c = *pattern++) == EOS) { 135 c = '\\'; 136 --pattern; 137 } 138 } 139 /* FALLTHROUGH */ 140 default: 141 norm: 142 if (c == *string) 143 ; 144 else if ((flags & FNM_CASEFOLD) && 145 (tolower((unsigned char)c) == 146 tolower((unsigned char)*string))) 147 ; 148 else 149 return (FNM_NOMATCH); 150 string++; 151 break; 152 } 153 /* NOTREACHED */ 154 } 155 156 static int 157 rangematch(const char *pattern, char test, int flags, char **newp) 158 { 159 int negate, ok; 160 char c, c2; 161 162 /* 163 * A bracket expression starting with an unquoted circumflex 164 * character produces unspecified results (IEEE 1003.2-1992, 165 * 3.13.2). This implementation treats it like '!', for 166 * consistency with the regular expression syntax. 167 * J.T. Conklin (conklin@ngai.kaleida.com) 168 */ 169 if ( (negate = (*pattern == '!' || *pattern == '^')) ) 170 ++pattern; 171 172 if (flags & FNM_CASEFOLD) 173 test = tolower((unsigned char)test); 174 175 /* 176 * A right bracket shall lose its special meaning and represent 177 * itself in a bracket expression if it occurs first in the list. 178 * -- POSIX.2 2.8.3.2 179 */ 180 ok = 0; 181 c = *pattern++; 182 do { 183 if (c == '\\' && !(flags & FNM_NOESCAPE)) 184 c = *pattern++; 185 if (c == EOS) 186 return (RANGE_ERROR); 187 188 if (c == '/' && (flags & FNM_PATHNAME)) 189 return (RANGE_NOMATCH); 190 191 if (flags & FNM_CASEFOLD) 192 c = tolower((unsigned char)c); 193 194 if (*pattern == '-' 195 && (c2 = *(pattern+1)) != EOS && c2 != ']') { 196 pattern += 2; 197 if (c2 == '\\' && !(flags & FNM_NOESCAPE)) 198 c2 = *pattern++; 199 if (c2 == EOS) 200 return (RANGE_ERROR); 201 202 if (flags & FNM_CASEFOLD) 203 c2 = tolower((unsigned char)c2); 204 205 if (c <= test && test <= c2) 206 ok = 1; 207 } else if (c == test) 208 ok = 1; 209 } while ((c = *pattern++) != ']'); 210 211 *newp = (char *)(uintptr_t)pattern; 212 return (ok == negate ? RANGE_NOMATCH : RANGE_MATCH); 213 }
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