Where can I get the source code for the Bourne Shell?

From: Tim Cambrant (tim_at_cambrant.com.net)
Date: 09/29/03 

Date: Mon, 29 Sep 2003 11:21:58 +0200

Hi, I'm looking for the complete source code for the Bourne Shell. Note that
I do not want the sources of BASH or any other shell. /bin/sh only. However,
I don't know about Bourne Shell's license. Is it even open source? If not,
what other shells that resemble sh in lack of features etc. is there?

The reason I'm asking this is because I'm looking for a spare time
programming project, and shell programming (not scripting) sounds
interesting. However, I don't want to dive into huge packs of source like
that of BASH etc. Since sh is pretty minimal, I figured it would make a good
base for building on. (Adding aliases etc.)

I would be very grateful for any help I could get. I spent the entire
morning searching the web and old usenet-posts, but I still couldn't find a
place to download the sources.

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