Description

   The vfwscanf function is equivalent to the fwscanf function,
   except that instead of being called with a variable number of
   arguments, it is called with an argument list (ap) that has been
   initialized by va_start (and possibly with subsequent va_arg
   calls).

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

   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.