[TUHS] v7 source code for sh

Steve Nickolas usotsuki at buric.co
Sun Feb 20 02:03:05 AEST 2022

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:


> 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.


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