Hello,
I noticed that declaration of variable like:
a:string[1]; is not valid any more in fpc-2.0.2, so how can I declare a variable to get few char string instead of full length
thanks
Andy
Mailing lists / fpc-pascal / 2006-02
string in fpc
11 messages · 5 people · –
- Marco van de Voort 4
- Michael Van Canneyt 3
- Jonas Maebe 2
- Andrzej Baran 1
- Felipe Monteiro de Carvalho 1
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Andrzej Baran wroteI noticed that declaration of variable like: a:string[1]; is not valid any more in fpc-2.0.2, so how can I declare a variable to get few char string instead of full length
It works here, even if ansistrings are the default ({$h+} or Delphi mode activated). The only thing that (logically) doesn't work here is "a:ansistring[1]".
Note that 2.02 has a bug whereby reading such length-limited strings can cause a buffer overflow (which has been fixed in the mean time).
Jonas
Show quoted text 10 lines
On 10 Feb 2006, at 20:31, Andrzej Baran wrote:
> I noticed that declaration of variable like:
> a:string[1]; is not valid any more in fpc-2.0.2, so how can I
> declare a
> variable to get few char string instead of full length
It works here, even if ansistrings are the default ({$h+} or Delphi
mode activated). The only thing that (logically) doesn't work here is
"a:ansistring[1]".
This also doesn't work (I don't see why not?)
{$mode delphi}
var x : shortstring[4];
begin
end.[Snail] </home/marcov/testing> fpc testshort
Free Pascal Compiler version 2.1.1 [2006/02/10] for i386 Copyright (c) 1993-2005 by Florian Klaempfl
Target OS: FreeBSD/ELF for i386
Compiling testshort.pp
testshort.pp(5,23) Error: Error in type definition testshort.pp(8,4) Fatal: There were 1 errors compiling module, stopping Fatal: Compilation aborted
Error: /home/marcov/bin/ppc386 returned an error exitcode (normal if you did not specify a source file to be compiled)
[Snail] </home/marcov/testing>
Marco van de Voort wrote 19 lines
> On 10 Feb 2006, at 20:31, Andrzej Baran wrote:
>
> > I noticed that declaration of variable like:
> > a:string[1]; is not valid any more in fpc-2.0.2, so how can I
> > declare a
> > variable to get few char string instead of full length
>
> It works here, even if ansistrings are the default ({$h+} or Delphi
> mode activated). The only thing that (logically) doesn't work here is
> "a:ansistring[1]".
This also doesn't work (I don't see why not?)
{$mode delphi}
var x : shortstring[4];
begin
end.
Because shortstring is defined as String[255]
Michael.
Show quoted text 23 lines
On Sat, 11 Feb 2006, Marco van de Voort wrote:
> > On 10 Feb 2006, at 20:31, Andrzej Baran wrote:
> >
> > > I noticed that declaration of variable like:
> > > a:string[1]; is not valid any more in fpc-2.0.2, so how can I
> > > declare a
> > > variable to get few char string instead of full length
> >
> > It works here, even if ansistrings are the default ({$h+} or Delphi
> > mode activated). The only thing that (logically) doesn't work here is
> > "a:ansistring[1]".
>
> This also doesn't work (I don't see why not?)
>
> {$mode delphi}
>
> var x : shortstring[4];
>
> begin
> end.
Because shortstring is defined as String[255]
Hmm. How do I get real shortstring behaviour in delphi mode then?
Marco van de Voort wrote> Because shortstring is defined as String[255] Hmm. How do I get real shortstring behaviour in delphi mode then?
A string[255] is identical to a "real shortstring".
Jonas
Show quoted text 7 lines
On 11 Feb 2006, at 17:40, Marco van de Voort wrote:
>> Because shortstring is defined as String[255]
>
> Hmm. How do I get real shortstring behaviour in delphi mode then?
A string[255] is identical to a "real shortstring".
I mean including the possibilties to have non-255 sizes.
Marco van de Voort wroteI mean including the possibilties to have non-255 sizes.
var x : string[4];I suppose?
Felipe Monteiro de Carvalho
Show quoted text 6 lines
On 2/11/06, Marco van de Voort wrote:
> I mean including the possibilties to have non-255 sizes.
var x : string[4];
I suppose?
Apparantly so yes. Assumed that would equal to ansistring[4], but it does to tp string[4].
I mean including the possibilties to have non-255 sizes.
Marco van de Voort wrote 9 lines
> On 11 Feb 2006, at 17:40, Marco van de Voort wrote:
>
> >> Because shortstring is defined as String[255]
> >
> > Hmm. How do I get real shortstring behaviour in delphi mode then?
>
> A string[255] is identical to a "real shortstring".
I mean including the possibilties to have non-255 sizes.
Simple:
Var
A : String[10];
{$H+} just means that for
A : String;A is an ansistring.
{$H-} means that for
A : String;A is a 255 char string, TP style, and hence is equivalent to
A : ShortString
As soon as there is a size indication, it's a TP-style string.
Michael.
Apparantly so yes. Assumed that would equal to ansistring[4], but it does to tp string[4].
Marco van de Voort wrote 9 lines
> On 2/11/06, Marco van de Voort wrote:
> > I mean including the possibilties to have non-255 sizes.
>
> var x : string[4];
>
> I suppose?
Apparantly so yes. Assumed that would equal to ansistring[4], but it does to
tp string[4].
TP is correct. Ansistring[4] is not valid, never...
Michael.