1/* File name comparison routine. 2 3 Copyright (C) 2007 Free Software Foundation, Inc. 4 5 This program is free software; you can redistribute it and/or modify 6 it under the terms of the GNU General Public License as published by 7 the Free Software Foundation; either version 2, or (at your option) 8 any later version. 9 10 This program is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 GNU General Public License for more details. 14 15 You should have received a copy of the GNU General Public License 16 along with this program; if not, write to the Free Software Foundation, 17 Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */ 18 19#ifdef HAVE_CONFIG_H 20#include "config.h" 21#endif 22 23#ifdef HAVE_STRING_H 24#include <string.h> 25#endif 26 27#include "filenames.h" 28#include "safe-ctype.h" 29 30/* 31 32@deftypefn Extension int filename_cmp (const char *@var{s1}, const char *@var{s2}) 33 34Return zero if the two file names @var{s1} and @var{s2} are equivalent. 35If not equivalent, the returned value is similar to what @code{strcmp} 36would return. In other words, it returns a negative value if @var{s1} 37is less than @var{s2}, or a positive value if @var{s2} is greater than 38@var{s2}. 39 40This function does not normalize file names. As a result, this function 41will treat filenames that are spelled differently as different even in 42the case when the two filenames point to the same underlying file. 43However, it does handle the fact that on DOS-like file systems, forward 44and backward slashes are equal. 45 46@end deftypefn 47 48*/ 49 50int 51filename_cmp (const char *s1, const char *s2) 52{ 53#ifndef HAVE_DOS_BASED_FILE_SYSTEM 54 return strcmp(s1, s2); 55#else 56 for (;;) 57 { 58 int c1 = TOLOWER (*s1); 59 int c2 = TOLOWER (*s2); 60 61 /* On DOS-based file systems, the '/' and the '\' are equivalent. */ 62 if (c1 == '/') 63 c1 = '\\'; 64 if (c2 == '/') 65 c2 = '\\'; 66 67 if (c1 != c2) 68 return (c1 - c2); 69 70 if (c1 == '\0') 71 return 0; 72 73 s1++; 74 s2++; 75 } 76#endif 77} 78 79