Description

   The fwprintf function writes output to the stream pointed to by
   stream under control of the wide-character string pointed to by
   format, which specifies how to convert subsequent arguments to
   output. 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 are otherwise
   ignored. The fwprintf function returns when it encounters the end
   of the format string.

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

   o  Ordinary wide characters (not the percent sign (%))

   o  Conversion specifications