On Wednesday 31 March 2004 08:46 pm, David Laight wrote:
> I also suspect than 'nvi' (as on linux) contains some of the AT&T vi
> source!  It is far too 'bug compatible' to be a clean room copy.

nvi does not contain any original vi code.  The reason it's so bug-compatible 
is simply that Keith is (was?) insane.  And several people (including myself) 
complained about lots of obscure things it didn't do "right" in the early 
days.