1 /* $OpenBSD: fnmatch.c,v 1.13 2006/03/31 05:34:14 deraadt Exp $ */ 2 3 /* 4 * Copyright (c) 1989, 1993, 1994 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Guido van Rossum. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 /* 36 * Function fnmatch() as specified in POSIX 1003.2-1992, section B.6. 37 * Compares a filename or pathname to a pattern. 38 */ 39 40 #include <ctype.h> 41 #include <stdio.h> 42 #include <string.h> 43 #include <fnmatch.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 strchr(string, '/') == NULL ? 93 0 : FNM_NOMATCH); 94 else 95 return (0); 96 } else if (c == '/' && (flags & FNM_PATHNAME)) { 97 if ((string = strchr(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 /* not a good range, treat as normal text */ 124 goto normal; 125 case RANGE_MATCH: 126 pattern = newp; 127 break; 128 case RANGE_NOMATCH: 129 return (FNM_NOMATCH); 130 } 131 ++string; 132 break; 133 case '\\': 134 if (!(flags & FNM_NOESCAPE)) { 135 if ((c = *pattern++) == EOS) { 136 c = '\\'; 137 --pattern; 138 } 139 } 140 /* FALLTHROUGH */ 141 default: 142 normal: 143 if (c != *string && !((flags & FNM_CASEFOLD) && 144 (tolower((unsigned char)c) == 145 tolower((unsigned char)*string)))) 146 return (FNM_NOMATCH); 147 ++string; 148 break; 149 } 150 /* NOTREACHED */ 151 } 152 153 static int 154 rangematch(const char *pattern, char test, int flags, char **newp) 155 { 156 int negate, ok; 157 char c, c2; 158 159 /* 160 * A bracket expression starting with an unquoted circumflex 161 * character produces unspecified results (IEEE 1003.2-1992, 162 * 3.13.2). This implementation treats it like '!', for 163 * consistency with the regular expression syntax. 164 * J.T. Conklin (conklin@ngai.kaleida.com) 165 */ 166 if ((negate = (*pattern == '!' || *pattern == '^'))) 167 ++pattern; 168 169 if (flags & FNM_CASEFOLD) 170 test = (char)tolower((unsigned char)test); 171 172 /* 173 * A right bracket shall lose its special meaning and represent 174 * itself in a bracket expression if it occurs first in the list. 175 * -- POSIX.2 2.8.3.2 176 */ 177 ok = 0; 178 c = *pattern++; 179 do { 180 if (c == '\\' && !(flags & FNM_NOESCAPE)) 181 c = *pattern++; 182 if (c == EOS) 183 return (RANGE_ERROR); 184 if (c == '/' && (flags & FNM_PATHNAME)) 185 return (RANGE_NOMATCH); 186 if ((flags & FNM_CASEFOLD)) 187 c = (char)tolower((unsigned char)c); 188 if (*pattern == '-' 189 && (c2 = *(pattern+1)) != EOS && c2 != ']') { 190 pattern += 2; 191 if (c2 == '\\' && !(flags & FNM_NOESCAPE)) 192 c2 = *pattern++; 193 if (c2 == EOS) 194 return (RANGE_ERROR); 195 if (flags & FNM_CASEFOLD) 196 c2 = (char)tolower((unsigned char)c2); 197 if (c <= test && test <= c2) 198 ok = 1; 199 } else if (c == test) 200 ok = 1; 201 } while ((c = *pattern++) != ']'); 202 203 *newp = (char *)pattern; 204 return (ok == negate ? RANGE_NOMATCH : RANGE_MATCH); 205 } 206