efficient way to determine diff between wc and a tag?

In migrating from CVS, we have some users who use a useful command to
determine what files are different from the current wc and a tag. It is
done with

alias cvsr 'cvs -n update -r \!* |& grep
"^[UAMCR]|abort|update.*nothing|pertinent|ignored"'

used as:

% cvsr TAGNAME

Now we are creating tags in /tags whereas the working copy is presumably
based on /trunk. Can anyone think of an efficient way to get the list
of files or an output suitable for a Perl script?

-- 
Chris Wein
Software Manager
Mobilygen Corp.
E-Mail : cwein@mobilygen.com
Phone  : 408-869-4035
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