Description

   The vfscanf function is the same as the fscanf function except
   that instead of being called with a variable number of arguments,
   it is called with an argument list that has been initialized by
   va_start (and possibly subsequent va_arg calls).

   If no conversion specifications are given, you can omit the input
   pointers. Otherwise, the function calls must have exactly as
   many input pointers as there are conversion specifications, and
   the conversion specifications must match the types of the input
   pointers.

   Conversion specifications are matched to input sources in left-
   to-right order. Excess input pointers, if any, are ignored.

   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.

   This function returns the number of successfully matched and
   assigned input items.

   See also vscanf and vsscanf.