libpq and db information

hello,

is there any way to be able to peer to a database' information (tables and
their fields) similar to reflection in java using libpq?  i know one can
use the \d recursively but isn't there a way using libpq?  i need the
information to properly modify a particular part in radius.

thanks.

[---]
Neil D. Quiogue <neil@iphil.net>
IPhil Communications Network, Inc.
Other: neil@postgresql.org