1 /* $NetBSD: fnmatch.c,v 1.17 2000/01/22 22:19:10 mycroft 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. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the University of 21 * California, Berkeley and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 */ 38 39 #include <sys/cdefs.h> 40 #if defined(LIBC_SCCS) && !defined(lint) 41 #if 0 42 static char sccsid[] = "@(#)fnmatch.c 8.2 (Berkeley) 4/16/94"; 43 #else 44 __RCSID("$NetBSD: fnmatch.c,v 1.17 2000/01/22 22:19:10 mycroft Exp $"); 45 #endif 46 #endif /* LIBC_SCCS and not lint */ 47 48 /* 49 * Function fnmatch() as specified in POSIX 1003.2-1992, section B.6. 50 * Compares a filename or pathname to a pattern. 51 */ 52 53 #include "namespace.h" 54 55 #include <assert.h> 56 #include <fnmatch.h> 57 #include <string.h> 58 59 #ifdef __weak_alias 60 __weak_alias(fnmatch,_fnmatch) 61 #endif 62 63 #define EOS '\0' 64 65 static const char *rangematch __P((const char *, int, int)); 66 67 int 68 fnmatch(pattern, string, flags) 69 const char *pattern, *string; 70 int flags; 71 { 72 const char *stringstart; 73 char c, test; 74 75 _DIAGASSERT(pattern != NULL); 76 _DIAGASSERT(string != NULL); 77 78 for (stringstart = string;;) 79 switch (c = *pattern++) { 80 case EOS: 81 return (*string == EOS ? 0 : FNM_NOMATCH); 82 case '?': 83 if (*string == EOS) 84 return (FNM_NOMATCH); 85 if (*string == '/' && (flags & FNM_PATHNAME)) 86 return (FNM_NOMATCH); 87 if (*string == '.' && (flags & FNM_PERIOD) && 88 (string == stringstart || 89 ((flags & FNM_PATHNAME) && *(string - 1) == '/'))) 90 return (FNM_NOMATCH); 91 ++string; 92 break; 93 case '*': 94 c = *pattern; 95 /* Collapse multiple stars. */ 96 while (c == '*') 97 c = *++pattern; 98 99 if (*string == '.' && (flags & FNM_PERIOD) && 100 (string == stringstart || 101 ((flags & FNM_PATHNAME) && *(string - 1) == '/'))) 102 return (FNM_NOMATCH); 103 104 /* Optimize for pattern with * at end or before /. */ 105 if (c == EOS) { 106 if (flags & FNM_PATHNAME) 107 return (strchr(string, '/') == NULL ? 108 0 : FNM_NOMATCH); 109 else 110 return (0); 111 } else if (c == '/' && flags & FNM_PATHNAME) { 112 if ((string = strchr(string, '/')) == NULL) 113 return (FNM_NOMATCH); 114 break; 115 } 116 117 /* General case, use recursion. */ 118 while ((test = *string) != EOS) { 119 if (!fnmatch(pattern, string, flags & ~FNM_PERIOD)) 120 return (0); 121 if (test == '/' && flags & FNM_PATHNAME) 122 break; 123 ++string; 124 } 125 return (FNM_NOMATCH); 126 case '[': 127 if (*string == EOS) 128 return (FNM_NOMATCH); 129 if (*string == '/' && flags & FNM_PATHNAME) 130 return (FNM_NOMATCH); 131 if ((pattern = 132 rangematch(pattern, *string, flags)) == NULL) 133 return (FNM_NOMATCH); 134 ++string; 135 break; 136 case '\\': 137 if (!(flags & FNM_NOESCAPE)) { 138 if ((c = *pattern++) == EOS) { 139 c = '\\'; 140 --pattern; 141 } 142 } 143 /* FALLTHROUGH */ 144 default: 145 if (c != *string++) 146 return (FNM_NOMATCH); 147 break; 148 } 149 /* NOTREACHED */ 150 } 151 152 static const char * 153 rangematch(pattern, test, flags) 154 const char *pattern; 155 int test, flags; 156 { 157 int negate, ok; 158 char c, c2; 159 160 _DIAGASSERT(pattern != NULL); 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 == '^')) != 0) 170 ++pattern; 171 172 for (ok = 0; (c = *pattern++) != ']';) { 173 if (c == '\\' && !(flags & FNM_NOESCAPE)) 174 c = *pattern++; 175 if (c == EOS) 176 return (NULL); 177 if (*pattern == '-' 178 && (c2 = *(pattern+1)) != EOS && c2 != ']') { 179 pattern += 2; 180 if (c2 == '\\' && !(flags & FNM_NOESCAPE)) 181 c2 = *pattern++; 182 if (c2 == EOS) 183 return (NULL); 184 if (c <= test && test <= c2) 185 ok = 1; 186 } else if (c == test) 187 ok = 1; 188 } 189 return (ok == negate ? NULL : pattern); 190 } 191