Compares two wide-character strings and returns an integer
    that indicates if the strings differ, and how they differ.
    The function uses the collating information in the LC_COLLATE
    category of the current locale to determine how the comparison is
    performed.

    Format

      #include  <wchar.h>

      int wcscoll  (const wchar_t *ws1, const wchar_t *ws2);