The fwscanf function reads input from the stream pointed to by
    stream under the control of the wide-character string pointed
    to by format. If there are insufficient arguments for the
    format, the behavior is undefined. If the format is exhausted
    while arguments remain, the excess arguments are evaluated, but
    otherwise ignored.

    The format is composed of zero or more directives that include:

    o  One or more white-space wide characters.

    o  An ordinary wide character (neither a percent (%))  nor a
       white-space wide character).

    o  Conversion specifications.

    Each conversion specification is introduced by the wide character
    %.

    If the stream pointed to by the stream argument has no
    orientation, fwscanf makes the stream wide-oriented.