Finally got around to fixing up my perl module to manipulate RCS/CVS files enough that it might actually be useful for manipulation.

It is now able to read and write RCS/CVS files, to retrieve the text for any version in the file, and to add new versions on an already existing branch. It is robust enough on the read/write that I couldn't find any errors in a full pass through the FreeBSD repository (reading in every single file, writing it out, and looking through the diffs between the original and the new copy.)

Forward steps:

1. Check that adding deltas on a branch work correctly
2. Extend the Invariant check to be closer to a complete check of the invariants for the object
3. Add support for adding new branches
4. Add more useful accessor methods
5. Add documentation
6. Declare project complete, upload it to CPAN, and go for SCCSFile.pm

Preliminary code is at http://www.freebsd.org/~eivind/CVSFile-0.1.tar.gz.