[fpc-devel] TStreamReader (streamex unit) issue

Michael Van Canneyt michael at freepascal.org
Fri Apr 9 09:11:28 CEST 2021


Can you please post this in the bugtracker ? 
So it will not be forgotten.


On Thu, 8 Apr 2021, Andrea Mauri via fpc-devel wrote:

> Dear all,
> TStreamReader.ReadLine seems to fail under specific circumstances.
> I created a test to easily reproduce the problem.
> The test makes use of a TStream that behaves in a weird, but formally
> correct way. I created it based on a real experience with the StdIn that I
> was able to reproduce thanks to pre-existing logging.
> I suggest you use the test on Windows otherwise I'm not sure you'll be able
> to reproduce the problem.
> I believe the bug can be fixed by updating VPByte right after FillBuffer is
> called:
>      [...]
>      FillBuffer;
>      VPByte := @FBuffer[FBufferPosition]; //bugfix
>      VPosition := FBufferPosition;
>      [...]
> Tested with Lazarus 2.0.10 FPC 3.2.0 on Win64
> Posted on lazarus forum at:
> https://forum.lazarus.freepascal.org/index.php?topic=54033.msg400820#msg400820
> Is it a bug or am I missing something?
> Kind regards,
> Andrea

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