[fpc-pascal] Writeln() behaves differently on Windows and Linux, why?

[Bo Berglund]

On Thu, 9 Jul 2020 16:25:50 +0000, Alexander Grotewohl
<alex at dcclost.com> wrote:

>perhaps try 'reset' or 'stty sane' in the terminal before running your program?

reset in PuTTY gives me a new resized empty screen, but works exactly
the same afterwards.

>are you using the crt or video units at all?
Yes, see below.
>
>it sounds like your terminal has gotten fudged somehow
>

I am using crt in the lpr file just for the sake of being able to shut
it down sensibly:

  try
    RemoteSrv.ClientPort := 23500; //Set port explicitly
    Logger.StdLog('Starting remote server on port: ' +
IntToStr(RemoteSrv.ClientPort));
    Writeln('Starting remote server on port: ' +
IntToStr(RemoteSrv.ClientPort));
    RemoteSrv.StartServer;
    Writeln('Server running, hit q to exit!');
    repeat
      ch := ReadKey;  <== NEEDS unit crt to read the keypress
    until ch='q'; {q}
    Writeln('Shutting down server');
    Logger.StdLog('Shutting down server');
    RemoteSrv.StopServer;
  finally
    RemoteSrv.Free;
  end;
  Writeln('Terminating program');

The messages put out from this code are all left aligned.
>From then on the messages are stacked sideways but on a new line.

So when the server (it is a TCP/IP socket server) gets a client call
this is written in the console by the writeln() executed inside the
handler as I showed in my start message.

I have tried the Linux terminal on Raspbian Buster and from Windows
PuTTY, both show the same strange behaviour.

If I run the program on Windows this does not happen (same code just
compiled on Windows or Linux).


-- 
Bo Berglund
Developer in Sweden