Function strncmp

include/string.h:387–398

#  if __has_builtin(__builtin_strncmp)
builtin_function(strncmp) int strncmp(FAR const char *s1,
                                      FAR const char *s2, size_t n)
{
  if (__builtin_constant_p(s1) && __builtin_constant_p(s2))
    {
      return __builtin_strncmp(s1, s2, n);
    }
  else
    {
      return __orig_strncmp(s1, s2, n);
    }
}
#  endif

#  if __has_builtin(__builtin_strncpy)