Locates text tokens in a given wide-character string.

    Format

      #include  <wchar.h>

      wchar_t *wcstok  (wchar_t *ws1, const wchar_t *ws2); (XPG4)

      wchar_t *wcstok  (wchar_t *ws1, const wchar_t *ws2, wchar_t
                       **ptr); (ISO C)