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9c577e89 DD |
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 | ||
2657faa6 AS |
19 | #ifdef HAVE_CONFIG_H |
20 | #include "config.h" | |
21 | #endif | |
22 | ||
9c577e89 DD |
23 | #ifdef HAVE_STRING_H |
24 | #include <string.h> | |
25 | #endif | |
26 | ||
27 | #include <ctype.h> | |
28 | #include "filenames.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 paths @var{s1} and @var{s2} are equivalent. | |
35 | If not equivalent, the returned value is similar to what strcmp would | |
36 | return. In other words, it returns a negative value if @var{s1} is less | |
37 | than @var{s2}, or a positive value if @var{s2} is greater than @var{s2}. | |
38 | ||
39 | This function does not normalize path names. As a result, this function | |
40 | will treat filenames that are spelled differently as different even in | |
41 | the case when the two filenames point to the same underlying file. | |
42 | However, it does handle the fact that on DOS-like file systems, forward | |
43 | and backward slashes are equal. | |
44 | ||
45 | @end deftypefn | |
46 | ||
47 | */ | |
48 | ||
49 | int | |
50 | filename_cmp (const char *s1, const char *s2) | |
51 | { | |
52 | #ifndef HAVE_DOS_BASED_FILE_SYSTEM | |
53 | return strcmp(s1, s2); | |
54 | #else | |
55 | for (;;) | |
56 | { | |
57 | int c1 = tolower (*s1); | |
58 | int c2 = tolower (*s2); | |
59 | ||
60 | /* On DOS-based file systems, the '/' and the '\' are equivalent. */ | |
61 | if (c1 == '/') | |
62 | c1 = '\\'; | |
63 | if (c2 == '/') | |
64 | c2 = '\\'; | |
65 | ||
66 | if (c1 != c2) | |
67 | return (c1 - c2); | |
68 | ||
69 | if (c1 == '\0') | |
70 | return 0; | |
71 | ||
72 | s1++; | |
73 | s2++; | |
74 | } | |
75 | #endif | |
76 | } | |
77 |