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Groups > comp.lang.c > #140344

Re: Distributing C as headers.

From Ben Bacarisse <ben.usenet@bsb.me.uk>
Newsgroups comp.lang.c
Subject Re: Distributing C as headers.
Date 2019-01-28 02:19 +0000
Organization A noiseless patient Spider
Message-ID <8736pdv80w.fsf@bsb.me.uk> (permalink)
References (14 earlier) <m2bm41ek17.fsf@despina.home> <%Hr3E.90867$nC1.33629@fx04.am4> <OTr3E.154256$592.32298@fx16.am4> <87bm41vb3k.fsf@bsb.me.uk> <10t3E.125278$9A2.93679@fx09.am4>

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Bart <bc@freeuk.com> writes:

> On 28/01/2019 01:12, Ben Bacarisse wrote:
>> Bart <bc@freeuk.com> writes:
>>
>>> On 28/01/2019 00:06, Bart wrote:
>>>> On 27/01/2019 23:51, Pascal J. Bourguignon wrote:
>>>
>>>>> In C, you need a lot more information to be able to use the header.
>>>>> In Pascal, you have all the information you need:
>>>>>
>>>>>      var
>>>>>         dst:string;
>>>>>      begin
>>>>>        string_copy(dst,'Hello World');
>>>>>      end;
>>>>>
>>>>> will work without crashing.
>>>>
>>>> What would string_copy(dst, dst) do? What is the capacity of dst?
>>>> (Last time I used Pascal, strings had to have a fixed length.)
>>>
>>> I couldn't compile your Pascal code. Do you have a real, complete
>>> example that will run? I have Free Pascal Compiler.
>>
>> This is a runable example, though I have no idea if it illustrates
>> whatever point was being made:
>>
>> program copystring (output);
>> procedure string_copy(var dst : string; src : string);
>> begin
>>     dst := src
>> end;
>> var dst : string;
>> begin
>>     string_copy(dst, 'Hello World');
>>     write(dst)
>> end.
>
> Thanks. I think the point was that you couldn't make a Pascal program crash, as the interfaces are more robust. However if I modify your example to:
>
>    program copystring (output);
>    procedure string_copy(var dst : string; src : string);
>    begin
>       string_copy(dst,src)
>    end;
>    var dst : string;
>    begin
>       string_copy(dst, 'Hello World');
>       write(dst)
>    end.
>
> then run via FPC it gives me:
>
>  Runtime error 202 at $0040142E
>   $0040142E
>   $00401441
>   $00401441
>   $00401441
>   $00401441
>   $00401441
>   $00401441
>   $00401441
>   $00401441
>   $00401441
>
> (at a wild guess, it's run out of stack). I would say that it has
> crashed.

I went and looked.  James was talking about pointers so a more direct
example might be this:

program copystring (output);
procedure string_copy(var dst : string; src : string);
begin
   dst := src
end;
var dp : ^string;
begin
   string_copy(dp^, 'Hello World');
   write(dp^)
end.

> (Although apparently Pascal meant to write Lisp not Pascal, so it
> might not count.)

And I'm not sure that what he says counts.

-- 
Ben.

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Thread

Distributing C as headers. Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2019-01-25 07:23 -0800
  Re: Distributing C as headers. Thiago Adams <thiago.adams@gmail.com> - 2019-01-25 07:31 -0800
    Re: Distributing C as headers. Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2019-01-25 07:33 -0800
      Re: Distributing C as headers. Mateusz Viste <mateusz@wont.tell> - 2019-01-25 15:42 +0000
      Re: Distributing C as headers. gazelle@shell.xmission.com (Kenny McCormack) - 2019-01-25 17:40 +0000
        Re: Distributing C as headers. Thiago Adams <thiago.adams@gmail.com> - 2019-01-25 09:59 -0800
          Re: Distributing C as headers. Thiago Adams <thiago.adams@gmail.com> - 2019-01-25 10:01 -0800
          Re: Distributing C as headers. David Brown <david.brown@hesbynett.no> - 2019-01-25 22:17 +0100
            Re: Distributing C as headers. Bart <bc@freeuk.com> - 2019-01-25 21:33 +0000
        Re: Distributing C as headers. Mateusz Viste <mateusz@wont.tell> - 2019-01-25 18:07 +0000
          Re: Distributing C as headers. gazelle@shell.xmission.com (Kenny McCormack) - 2019-01-25 18:46 +0000
            Re: Distributing C as headers. Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2019-01-25 19:43 -0700
              Re: Distributing C as headers. Mateusz Viste <mateusz@wont.tell> - 2019-01-26 08:13 +0000
                Re: Distributing C as headers. Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2019-01-26 13:39 -0700
                Re: Distributing C as headers. Mateusz Viste <mateusz@wont.tell> - 2019-01-26 21:00 +0000
                Re: Distributing C as headers. "Pascal J. Bourguignon" <pjb@informatimago.com> - 2019-01-26 22:29 +0100
                Re: Distributing C as headers. nobody@example.org (Scott) - 2019-01-27 04:56 +0000
                Re: Distributing C as headers. Dan Purgert <dan@djph.net> - 2019-01-27 11:36 +0000
                Re: Distributing C as headers. Tim Rentsch <tr.17687@z991.linuxsc.com> - 2019-02-25 12:26 -0800
                Re: Distributing C as headers. "Jason C. McDonald" <indeliblebluepen@gmail.com> - 2019-02-28 19:52 +0000
                Re: Distributing C as headers. Lew Pitcher <lew.pitcher@digitalfreehold.ca> - 2019-02-28 15:04 -0500
                Re: Distributing C as headers. "Pascal J. Bourguignon" <pjb@informatimago.com> - 2019-02-28 21:40 +0100
                Re: Distributing C as headers. James Kuyper <jameskuyper@alumni.caltech.edu> - 2019-02-28 13:57 -0800
                Re: Distributing C as headers. Jorgen Grahn <grahn+nntp@snipabacken.se> - 2019-01-27 13:33 +0000
                Re: Distributing C as headers. David Brown <david.brown@hesbynett.no> - 2019-01-27 15:06 +0100
                Re: Distributing C as headers. luser droog <luser.droog@gmail.com> - 2019-01-26 13:01 -0800
                Re: Distributing C as headers. "Pascal J. Bourguignon" <pjb@informatimago.com> - 2019-01-26 22:30 +0100
                Re: Distributing C as headers. Jorgen Grahn <grahn+nntp@snipabacken.se> - 2019-02-02 09:27 +0000
                Re: Distributing C as headers. "Pascal J. Bourguignon" <pjb@informatimago.com> - 2019-01-26 22:23 +0100
                Re: Distributing C as headers. Keith Thompson <kst-u@mib.org> - 2019-01-26 13:39 -0800
                Re: Distributing C as headers. "Pascal J. Bourguignon" <pjb@informatimago.com> - 2019-01-26 22:47 +0100
                Re: Distributing C as headers. Keith Thompson <kst-u@mib.org> - 2019-01-26 14:33 -0800
                Re: Distributing C as headers. "Pascal J. Bourguignon" <pjb@informatimago.com> - 2019-01-26 23:37 +0100
                Re: Distributing C as headers. Keith Thompson <kst-u@mib.org> - 2019-01-26 15:09 -0800
                Re: Distributing C as headers. David Brown <david.brown@hesbynett.no> - 2019-01-27 15:11 +0100
                Re: Distributing C as headers. James Kuyper <jameskuyper@alumni.caltech.edu> - 2019-01-27 16:12 -0500
                Re: Distributing C as headers. "Pascal J. Bourguignon" <pjb@informatimago.com> - 2019-01-28 00:51 +0100
                Re: Distributing C as headers. Bart <bc@freeuk.com> - 2019-01-28 00:06 +0000
                Re: Distributing C as headers. Bart <bc@freeuk.com> - 2019-01-28 00:18 +0000
                Re: Distributing C as headers. Ben Bacarisse <ben.usenet@bsb.me.uk> - 2019-01-28 01:12 +0000
                Re: Distributing C as headers. Bart <bc@freeuk.com> - 2019-01-28 01:35 +0000
                Re: Distributing C as headers. Ben Bacarisse <ben.usenet@bsb.me.uk> - 2019-01-28 02:19 +0000
                Re: Distributing C as headers. Bart <bc@freeuk.com> - 2019-01-28 10:40 +0000
                Re: Distributing C as headers. "Pascal J. Bourguignon" <pjb@informatimago.com> - 2019-01-28 12:22 +0100
                Re: Distributing C as headers. "Pascal J. Bourguignon" <pjb@informatimago.com> - 2019-01-28 12:21 +0100
                Re: Distributing C as headers. Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2019-01-28 04:03 -0800
                Re: Distributing C as headers. David Brown <david.brown@hesbynett.no> - 2019-01-28 13:23 +0100
                Re: Distributing C as headers. Keith Thompson <kst-u@mib.org> - 2019-01-28 11:16 -0800
                Re: Distributing C as headers. David Brown <david.brown@hesbynett.no> - 2019-01-28 21:08 +0100
                Re: Distributing C as headers. "Pascal J. Bourguignon" <pjb@informatimago.com> - 2019-01-28 01:19 +0100
                Re: Distributing C as headers. Keith Thompson <kst-u@mib.org> - 2019-01-27 16:59 -0800
                Re: Distributing C as headers. Keith Thompson <kst-u@mib.org> - 2019-01-27 16:33 -0800
                Re: Distributing C as headers. "Pascal J. Bourguignon" <pjb@informatimago.com> - 2019-01-28 01:35 +0100
                Re: Distributing C as headers. Keith Thompson <kst-u@mib.org> - 2019-01-27 17:20 -0800
                Re: Distributing C as headers. James Kuyper <jameskuyper@alumni.caltech.edu> - 2019-01-27 22:50 -0500
                Re: Distributing C as headers. David Brown <david.brown@hesbynett.no> - 2019-01-28 06:52 +0100
                Re: Distributing C as headers. Bart <bc@freeuk.com> - 2019-01-28 10:55 +0000
                Re: Distributing C as headers. "Pascal J. Bourguignon" <pjb@informatimago.com> - 2019-01-28 12:26 +0100
                Re: Distributing C as headers. David Brown <david.brown@hesbynett.no> - 2019-01-28 13:27 +0100
                Re: Distributing C as headers. David Brown <david.brown@hesbynett.no> - 2019-01-28 13:26 +0100
                Re: Distributing C as headers. "Pascal J. Bourguignon" <pjb@informatimago.com> - 2019-01-28 14:03 +0100
                Re: Distributing C as headers. Keith Thompson <kst-u@mib.org> - 2019-01-28 11:12 -0800
                Re: Distributing C as headers. "Pascal J. Bourguignon" <pjb@informatimago.com> - 2019-01-28 12:25 +0100
                Re: Distributing C as headers. David Brown <david.brown@hesbynett.no> - 2019-01-28 13:33 +0100
                Re: Distributing C as headers. Keith Thompson <kst-u@mib.org> - 2019-01-28 11:20 -0800
                Re: Distributing C as headers. David Brown <david.brown@hesbynett.no> - 2019-01-28 21:11 +0100
                Re: Distributing C as headers. scott@slp53.sl.home (Scott Lurndal) - 2019-01-28 21:12 +0000
                Re: Distributing C as headers. David Brown <david.brown@hesbynett.no> - 2019-01-28 23:06 +0100
                Re: Distributing C as headers. David Brown <david.brown@hesbynett.no> - 2019-01-27 15:02 +0100
    Re: Distributing C as headers. "Pascal J. Bourguignon" <pjb@informatimago.com> - 2019-01-25 17:51 +0100
    Re: Distributing C as headers. fir <profesor.fir@gmail.com> - 2019-01-25 14:28 -0800

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