uselocale - set/get the locale for the calling thread
The uselocale() function sets the current locale for the calling thread, and returns the thread's previously current locale. After a successful call to uselocale(), any calls by this thread to functions that depend on the locale will operate as though the locale has been set to
newloc argument can have one of the following values:
The calling thread's current locale is set to the specified locale.
The calling thread's current locale is set to the global locale determined by setlocale(3).
The calling thread's current locale is left unchanged (and the current locale is returned as the function result).
newloc does not refer to a valid locale object.
Unlike setlocale(3), uselocale() does not allow selective replacement of individual locale categories. To employ a locale that differs in only a few categories from the current locale, use calls to duplocale(3) and newlocale(3) to obtain a locale object equivalent to the current locale and modify the desired categories in that object.
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