Also, I've seen cases where a single line lookahead will not do the job. 
Some people paste multiple full revision logs (including the 'revision'
line) as "documentation" for their commit (like a merge of multiple changes
from a different cvs branch).  It happens unfortunately.  Without using cvs
or rcs to grab the log entry for a revision, it's hard in some cases in the
real world to tell where a cvs log entry ends.