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 34 Return zero if the two file names @var{s1} and @var{s2} are equivalent. 35 If not equivalent, the returned value is similar to what @code{strcmp} 36 would return. In other words, it returns a negative value if @var{s1} 37 is less than @var{s2}, or a positive value if @var{s2} is greater than 38 @var{s2}. 39 40 This function does not normalize file names. As a result, this function 41 will treat filenames that are spelled differently as different even in 42 the case when the two filenames point to the same underlying file. 43 However, it does handle the fact that on DOS-like file systems, forward 44 and backward slashes are equal. 45 46 @end deftypefn 47 48 */ 49 50 int 51 filename_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 /* 80 81 @deftypefn Extension int filename_ncmp (const char *@var{s1}, const char *@var{s2}, size_t @var{n}) 82 83 Return zero if the two file names @var{s1} and @var{s2} are equivalent 84 in range @var{n}. 85 If not equivalent, the returned value is similar to what @code{strncmp} 86 would return. In other words, it returns a negative value if @var{s1} 87 is less than @var{s2}, or a positive value if @var{s2} is greater than 88 @var{s2}. 89 90 This function does not normalize file names. As a result, this function 91 will treat filenames that are spelled differently as different even in 92 the case when the two filenames point to the same underlying file. 93 However, it does handle the fact that on DOS-like file systems, forward 94 and backward slashes are equal. 95 96 @end deftypefn 97 98 */ 99 100 int 101 filename_ncmp (const char *s1, const char *s2, size_t n) 102 { 103 #ifndef HAVE_DOS_BASED_FILE_SYSTEM 104 return strncmp(s1, s2, n); 105 #else 106 if (!n) 107 return 0; 108 for (; n > 0; --n) 109 { 110 int c1 = TOLOWER (*s1); 111 int c2 = TOLOWER (*s2); 112 113 /* On DOS-based file systems, the '/' and the '\' are equivalent. */ 114 if (c1 == '/') 115 c1 = '\\'; 116 if (c2 == '/') 117 c2 = '\\'; 118 119 if (c1 == '\0' || c1 != c2) 120 return (c1 - c2); 121 122 s1++; 123 s2++; 124 } 125 return 0; 126 #endif 127 } 128