ws1

    A pointer to a wide-character string containing zero or more text
    tokens.

 ws2

    A pointer to a separator string consisting of one or more wide
    characters. The separator string can differ from call to call.

 ptr

    ISO C Standard only. Used only when ws1 is NULL, ptr is a caller-
    provided wchar_t pointer into which wcstok stores information
    necessary for it to continue scanning the same wide-character
    string.