Temporary hash tables

For a module I'm thinking of writing, I need to be able to build a hash
table in memory. I guess with hard-disk backing if it got too big.
nodeHash.c has some good code but it's not really generic and I'm wondering
if perhaps someone has already done this before?

Similarly for storing random tuples in a list, though that is not anywhere
as difficult to write.

Any ideas? Thanks in advance...
--
Martijn van Oosterhout <kleptog@svana.org>
http://svana.org/kleptog/