s

    A pointer to a multibyte character sequence.

 n

    The maximum number of bytes that comprise the multibyte
    character.

 format

    A pointer to a wide-character string containing the format
    specifications. For more information about format and conversion
    specifications and their corresponding arguments, see the
    "Understanding Input and Output" chapter of the VSI C RTL
    Reference Manual.

 ap

    A variable list of the items needed for output.