Am 29.02.2012 13:54, schrieb ik:
On Wed, Feb 29, 2012 at 14:44, LacaK<la...@zoznam.sk> wrote:
Hi *,
I found small incompatibility between Delphi and FPC.
This code:
var a,b: array of byte;
begin
适适 setlength(a,2);
适适 b:=copy(a,2,1); //<--HERE "Range check error" in FPC, Delphi returns
empty array
end;
Delphi documentation says:
"If Index is larger than the length of S, Copy returns an empty string or
array."
http://docwiki.embarcadero.com/VCL/en/System.Copy
Can it be fixed also in FPC?
I think it's a Delphi bug to act like that. You must provide a length
that is not bigger in size. It's up to you the developer.
Otherwise you might have more then one type of buffer overflows in your code !
The way Delphi solved it, is by taking the responsibility from the
developer, and made the code a bit slower.
And as I said, I don't think it's a good idea
It's not a bug in Delphi if they write it in the documentation. Whether
we should copy this behavior is the question (maybe only in Delphi mode).
Regards,
Sven
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