fusl/src/ctype/iswupper.c

#include <wctype.h>
#include "libc.h"

int iswupper(wint_t wc) {
  return towlower(wc) != wc;
}

int __iswupper_l(wint_t c, locale_t l) {
  return iswupper(c);
}

weak_alias(__iswupper_l, iswupper_l);