1#include "locale_impl.h"
 2#if defined(__wasilibc_unmodified_upstream) || defined(_REENTRANT)
 3#include "pthread_impl.h"
 4#endif
 5#include "libc.h"
 6
 7locale_t __uselocale(locale_t new)
 8{
 9#if defined(__wasilibc_unmodified_upstream) || defined(_REENTRANT)
10	pthread_t self = __pthread_self();
11	locale_t old = self->locale;
12#else
13	locale_t old = libc.current_locale;
14	if (!old) old = LC_GLOBAL_LOCALE;
15#endif
16	locale_t global = &libc.global_locale;
17
18#if defined(__wasilibc_unmodified_upstream) || defined(_REENTRANT)
19	if (new) self->locale = new == LC_GLOBAL_LOCALE ? global : new;
20#else
21	if (new) libc.current_locale = new == LC_GLOBAL_LOCALE ? global : new;
22#endif
23
24	return old == global ? LC_GLOBAL_LOCALE : old;
25}
26
27weak_alias(__uselocale, uselocale);