//en.cppreference.com/w/c/string/wide/iswprint.html
#include <locale.h>
#include <stdio.h>
#include <wchar.h>
#include <wctype.h>
int main(void)
{
wchar_t c = L'\u2002'; // Unicode character 'EN SPACE'
printf("in the default locale, iswprint(%#x) = %d\n", c, !!iswprint(c));
setlocale(LC_ALL, "en_US.utf8");
printf("in Unicode locale, iswprint(%#x) = %d\n", c, !!iswprint(c));
wchar_t c2 = L'\x82'; // break permitted
printf("in Unicode locale, iswprint(%#x) = %d\n", c2, !!iswprint(c2));
}