| 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_STRING_H |
| 20 | #include <string.h> |
| 21 | #endif |
| 22 | |
| 23 | #include <ctype.h> |
| 24 | #include "filenames.h" |
| 25 | |
| 26 | /* |
| 27 | |
| 28 | @deftypefn Extension int filename_cmp (const char *@var{s1}, const char *@var{s2}) |
| 29 | |
| 30 | Return zero if the two paths @var{s1} and @var{s2} are equivalent. |
| 31 | If not equivalent, the returned value is similar to what strcmp would |
| 32 | return. In other words, it returns a negative value if @var{s1} is less |
| 33 | than @var{s2}, or a positive value if @var{s2} is greater than @var{s2}. |
| 34 | |
| 35 | This function does not normalize path names. As a result, this function |
| 36 | will treat filenames that are spelled differently as different even in |
| 37 | the case when the two filenames point to the same underlying file. |
| 38 | However, it does handle the fact that on DOS-like file systems, forward |
| 39 | and backward slashes are equal. |
| 40 | |
| 41 | @end deftypefn |
| 42 | |
| 43 | */ |
| 44 | |
| 45 | int |
| 46 | filename_cmp (const char *s1, const char *s2) |
| 47 | { |
| 48 | #ifndef HAVE_DOS_BASED_FILE_SYSTEM |
| 49 | return strcmp(s1, s2); |
| 50 | #else |
| 51 | for (;;) |
| 52 | { |
| 53 | int c1 = tolower (*s1); |
| 54 | int c2 = tolower (*s2); |
| 55 | |
| 56 | /* On DOS-based file systems, the '/' and the '\' are equivalent. */ |
| 57 | if (c1 == '/') |
| 58 | c1 = '\\'; |
| 59 | if (c2 == '/') |
| 60 | c2 = '\\'; |
| 61 | |
| 62 | if (c1 != c2) |
| 63 | return (c1 - c2); |
| 64 | |
| 65 | if (c1 == '\0') |
| 66 | return 0; |
| 67 | |
| 68 | s1++; |
| 69 | s2++; |
| 70 | } |
| 71 | #endif |
| 72 | } |
| 73 | |