1#include "libc.h"
2#include "locale_impl.h"
3#include "threads_impl.h"
4
5locale_t __uselocale(locale_t new) {
6    thrd_t self = __thrd_current();
7    locale_t old = self->locale;
8    locale_t global = &libc.global_locale;
9
10    if (new)
11        self->locale = new == LC_GLOBAL_LOCALE ? global : new;
12
13    return old == global ? LC_GLOBAL_LOCALE : old;
14}
15
16weak_alias(__uselocale, uselocale);
17