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Date: Sat, 19 Feb 2022 11:03:05 -0500 (EST)
From: Steve Nickolas <usotsuki@buric.co>
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Subject: Re: [TUHS] v7 source code for sh
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On Sat, 19 Feb 2022, Will Senn wrote:

> I have been poring through the v7 source code lately, and came across an 
> oddity I would like to know more about. Specifically, in sh. The code for sh 
> is c, but it makes *extensive* use of of macros, for example:

<snip>

> I can read the resultant code through the lens of my experience coding c, but 
> I'm curious why the macros and how this came about? In v6, the sh source is 
> straight up c. Is there a story behind it worth knowing?

Apparently Bourne was heavily into ALGOL, and used those macros to make C 
into something more familiar.

At least, that's what I concluded by reading her Wikipedia page as well as 
the code.

-uso.