1 | /* hard-locale.c -- Determine whether a locale is hard. |
2 | |
3 | Copyright (C) 1997-1999, 2002-2004, 2006-2007, 2009-2019 Free Software |
4 | Foundation, Inc. |
5 | |
6 | This program is free software: you can redistribute it and/or modify |
7 | it under the terms of the GNU General Public License as published by |
8 | the Free Software Foundation; either version 3 of the License, or |
9 | (at your option) any later version. |
10 | |
11 | This program is distributed in the hope that it will be useful, |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
14 | GNU General Public License for more details. |
15 | |
16 | You should have received a copy of the GNU General Public License |
17 | along with this program. If not, see <https://www.gnu.org/licenses/>. */ |
18 | |
19 | #include <config.h> |
20 | |
21 | #include "hard-locale.h" |
22 | |
23 | #include <locale.h> |
24 | #include <stdlib.h> |
25 | #include <string.h> |
26 | |
27 | #ifdef __GLIBC__ |
28 | # define GLIBC_VERSION __GLIBC__ |
29 | #elif defined __UCLIBC__ |
30 | # define GLIBC_VERSION 2 |
31 | #else |
32 | # define GLIBC_VERSION 0 |
33 | #endif |
34 | |
35 | /* Return true if the current CATEGORY locale is hard, i.e. if you |
36 | can't get away with assuming traditional C or POSIX behavior. */ |
37 | bool |
38 | hard_locale (int category) |
39 | { |
40 | bool hard = true; |
41 | char const *p = setlocale (category, NULL); |
42 | |
43 | if (p) |
44 | { |
45 | if (2 <= GLIBC_VERSION) |
46 | { |
47 | if (strcmp (p, "C" ) == 0 || strcmp (p, "POSIX" ) == 0) |
48 | hard = false; |
49 | } |
50 | else |
51 | { |
52 | char *locale = strdup (p); |
53 | if (locale) |
54 | { |
55 | /* Temporarily set the locale to the "C" and "POSIX" locales |
56 | to find their names, so that we can determine whether one |
57 | or the other is the caller's locale. */ |
58 | if (((p = setlocale (category, "C" )) |
59 | && strcmp (p, locale) == 0) |
60 | || ((p = setlocale (category, "POSIX" )) |
61 | && strcmp (p, locale) == 0)) |
62 | hard = false; |
63 | |
64 | /* Restore the caller's locale. */ |
65 | setlocale (category, locale); |
66 | free (locale); |
67 | } |
68 | } |
69 | } |
70 | |
71 | return hard; |
72 | } |
73 | |