topology of planar curves



Hi

In my new package for real algebraic geometry
I have implemented an algorithm for the computation
of the topology of planar curves, which for planar
curves produces something equivalent to 
a cylindrical algebraic decomposition (c.a.d.)

I wonder whether c.a.d. has already implemented
in Maxima?
If so, is it built-in? which Maxima commands?
If it is in an external package? Where could I get it?

   Fabrizio