1 /* $OpenBSD: duplocale.c,v 1.1 2017/09/05 03:16:13 schwarze Exp $ */
2 /*
3 * Copyright (c) 2017 Ingo Schwarze <schwarze@openbsd.org>
4 *
5 * Permission to use, copy, modify, and distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
8 *
9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16 */
17
18 #include <errno.h>
19 #include <locale.h>
20
21 #include "rune.h"
22
23 locale_t
duplocale(locale_t oldloc)24 duplocale(locale_t oldloc)
25 {
26 if (oldloc == _LOCALE_UTF8 && _Utf8RuneLocale != NULL)
27 return _LOCALE_UTF8;
28 if (oldloc == _LOCALE_C)
29 return _LOCALE_C;
30 if (oldloc == LC_GLOBAL_LOCALE)
31 return _GlobalRuneLocale == _Utf8RuneLocale ?
32 _LOCALE_UTF8 : _LOCALE_C;
33
34 /* POSIX says: invalid input -> undefined behaviour. */
35 errno = EINVAL;
36 return _LOCALE_NONE;
37 }
38