[Ecls-list] FFI type mismatch for integer

[Goffioul Michael]

I got a problem while playing with FFI and integer types (I'm actually trying
to build a FFI interface for Win32 GUI API). The problem is that conversion
between C and LISP is not invertable:

	C -> LISP : make_integer, which can produce bignums
	LISP -> C : object_to_fixnum, which can not handle bignums (the ones produced
			by make_integer)

I think there should be a "object_to_integer"  function.

Another point is that FFI doesn't seem to conserve signness of integers as "make_integer"
is used whether you defined the object type as :int or :unsigned-int.

Michael.