Re: compiling [old] c code

From	Ben Bacarisse <ben.usenet@bsb.me.uk>
Newsgroups	comp.lang.c
Subject	Re: compiling [old] c code
Date	2019-01-21 18:33 +0000
Organization	A noiseless patient Spider
Message-ID	<877eex273c.fsf@bsb.me.uk> (permalink)
References	<cbbefd94-59bf-489e-84c6-2633c289f119@googlegroups.com> <sb5a4ed6sbts2ua7o5bqsn4hc4juvakl3j@4ax.com> <d1e29de5-8371-44ef-965c-3762392a7822@googlegroups.com> <87d0oq19sq.fsf_-_@bsb.me.uk> <f6946512-fc7d-44d1-bcf7-68e7780b4898@googlegroups.com>

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fiziqs@gmail.com writes:

> On Monday, January 21, 2019 at 1:21:02 PM UTC+1, Ben Bacarisse wrote:
>> fiziqs@gmail.com writes:
>> 
>> > On Monday, January 21, 2019 at 1:45:03 AM UTC+1, Geoff wrote:
>> >> On Sun, 20 Jan 2019 14:51:00 -0800 (PST), fiziqs@gmail.com wrote:
>> <snip>
>> >> >I tried to compile a bit of code from the original Unix source and
>> >> >ran into the following problem:
>> <snip>
>> > Actually, it was the EFL language, just to know if it is still
>> > possible to compile this language:
>> > https://minnie.tuhs.org/cgi-bin/utree.pl?file=4.4BSD/usr/src/old/efl
>> 
>> Is there a link that allows a directory to be downloaded?  It looks much
>> more tractable than the very old C I, and others, were thinking about.
>> The sources there are from about 1982 and look like normal K&R C.
>> 
> Only as part of:
> https://www.tuhs.org/Archive/Distributions/UCB/4.4BSD-Alpha/src.tar.gz

That's not quite the same (no Makefile for example) but I assume C the
sources are similar.

Despite the date (1982) it is very old C.  I think you will struggle to
get it through a modern compiler.

Apart form the "big union" idea that's already been mentioned, you coud
try a macro:

#define PTR(p, s) ((struct s *)(p))

and re-write things like

  ttype = t->vtype;

as

  ttype = PTR(t, varblock)->vtype;

You might even be able to automate this a bit by using something like
Perl to record what structs have what members.

-- 
Ben.

Thread

compiling all c code fiziqs@gmail.com - 2019-01-20 14:51 -0800
  Re: compiling all c code Richard Damon <Richard@Damon-Family.org> - 2019-01-20 18:41 -0500
  Re: compiling all c code gazelle@shell.xmission.com (Kenny McCormack) - 2019-01-20 23:42 +0000
  Re: compiling all c code Geoff <geoff@invalid.invalid> - 2019-01-20 16:44 -0800
    Re: compiling all c code fiziqs@gmail.com - 2019-01-21 02:36 -0800
      Re: compiling [old] c code Ben Bacarisse <ben.usenet@bsb.me.uk> - 2019-01-21 12:20 +0000
        Re: compiling [old] c code fiziqs@gmail.com - 2019-01-21 04:58 -0800
          Re: compiling [old] c code Ben Bacarisse <ben.usenet@bsb.me.uk> - 2019-01-21 18:33 +0000
            Re: compiling [old] c code fir <profesor.fir@gmail.com> - 2019-01-22 04:21 -0800
              Re: compiling [old] c code Ben Bacarisse <ben.usenet@bsb.me.uk> - 2019-01-22 16:46 +0000
                Re: compiling [old] c code fir <profesor.fir@gmail.com> - 2019-01-22 10:35 -0800
                Re: compiling [old] c code Ben Bacarisse <ben.usenet@bsb.me.uk> - 2019-01-22 22:45 +0000
                Re: compiling [old] c code fir <profesor.fir@gmail.com> - 2019-01-22 14:58 -0800
                Re: compiling [old] c code Ben Bacarisse <ben.usenet@bsb.me.uk> - 2019-01-23 02:12 +0000
                Re: compiling [old] c code fir <profesor.fir@gmail.com> - 2019-01-23 00:59 -0800
        Re: compiling [old] c code fir <profesor.fir@gmail.com> - 2019-01-22 03:34 -0800
          Re: compiling [old] c code fir <profesor.fir@gmail.com> - 2019-01-22 04:08 -0800
      Re: compiling all c code Keith Thompson <kst-u@mib.org> - 2019-01-21 14:23 -0800

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