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