This program runs a normal diff as input to a pipe, and transforms that into
a 4.3bsd-style context diff.

To compile, just type "cc -o cdiff cdiff.c".  You might want to throw in
a -Dvoid=int if your C compiler doesn't grok the void type.

To run, just say "cdiff file1 file2".  Cdiff will run a "diff file1 file2"
for you, and modify that output to make the context diff.  If you don't have
a normal diff program, there is a PD version available from Erik Baalbergen
at erikb@cs.vu.nl.
