s

    A pointer to the resultant string.

 maxsize

    The maximum number of bytes to be stored in the resultant string.

 format

    A pointer to a string that controls the format of the output
    string.

  . . .

    The monetary values of type double that are to be formatted for
    the output string. There should be as many values as there are
    conversion specifications in the format string pointed to by
    format. The function fails if there are insufficient values.
    Excess arguments are ignored.