How to get system locale from std::setlocale?

Question

C++ / C#

Good afternoon, how can I get the current locale of the system?
I would like to get something like Russian_Russia.UTF-8, but I get only classic "C" locale

setlocale(LC_ALL, "");
auto l = setlocale(LC_ALL, ""); // тут "C"

Answer 1

1) if you use c++, then use std::locale better
2) read the man carefully - it says that if the locale argument (it is the second one) is NULL, then the current locale is returned
3) by default, it is quite possible that the xish locale will be set, therefore, first install what you need, and then get

#include <stdio.h>
#include <stdlib.h>
#include <locale.h>

int main() {
    printf("%s\n", setlocale(LC_ALL, NULL));
    printf("%s\n", setlocale(LC_ALL, "ru_RU.UTF-8"));
    printf("%s\n", setlocale(LC_ALL, NULL));
    return 0;
}

➜  /tmp  gcc test.c
➜  /tmp  ./a.out
C
ru_RU.UTF-8
ru_RU.UTF-8