Ctcompare 3.1 - Code Token Comparator

The purpose of this set of programs is to allow you to compare several sets of C, Java or Python code trees on a token basis, rather than on a line by line basis. The programs help to identify similarities between snippets of code in both trees, even if the actual lines are dissimilar.

Downloads & Documentation

Here is:

The source to ctcompare 3.1, and the README which tells you how to use it.
Here is a set of slides and an audio recording describing ctcompare version 3.1 and the token approach.
To verify that ctcompare is working, here are the results of running

$ ctcompare 32Vkernel.ctf Net2kernel.ctf

Sample CTF Files

Here are some sample CTF files of various operating system releases.

Source	Year	CTF File	Source Code
Unix Nsys kernel	1973	nsys.ctf	Available here
AUSAM kernel	1979	Ausam.ctf	Available here
Unix Version 7	1979	V7.ctf	Available here
System V R1 (vax)	1983	vaxSysVR1.ctf.gz	Not available
System V R2 (vax)	1984	vaxSysVR2.ctf.gz	Not available
Minix 1.2	1988	minix1.2.ctf	Available here
BSD Net/2 release	1991	net2.ctf.gz	Available here
4.4BSD-Alpha	1992	4.4BSD-Alpha.ctf.gz	Available here
Linux 0.96c	1992	linux-0.96c.ctf	Available here

Previous Versions

You can find the old 2.x versions of ctcompare here, and the old 1.x versions here.
Here is a paper describing ctcompare version 2.5.
Here is a paper and some seminar slides describing ctcompare version 1.3.

Warren Toomey wkt@tuhs.org, December 2009.