Here is the readme file that came with diff.c as posted to Usenet. I
can't remember who to give credit to, so I'll just say I'm not taking
credit for anything but compiling it.
--Steve
-	-	-	-	-	-	-	-	-	-

Here's a public domain diff with the -b and -c options.  (4.2bsd style
contex diffs.)  I wasn't aware that these wern't present in all unix
versions of diff, so I didn't think posting it was a priority.  It's
large, slow, and many of the comments are no longer true, but it does
work.  (except when it runs out of memory)  The one case I know of
where its output is incompatable with patch does seem to be pretty
rare.  No makefile is included, the 4.2bsd diff is better on the unix
system I use.  If you don't know how to compile and load a single C
program, this probably isn't the tool for you anyway.  I'd be grateful
to anyone who cleans this up and documents it properly.  It does
appear to have been separate files at some point, I'm presenting it in
a form similar to how I got it: mail headers and outdated documentation
in comments and all.  I just banged on it enough to get it doing what
I wanted.