security rule #1 : never assume anything...
2010/3/7 lyh1 lyh1...@hotmail.com:
But ShortStrings also store the length in string[0]. If I do a append, I
think the string will append to string[1]
So don't assume string are always initialized with null string?
Message: 5
Date: Sun, 7 Mar
But ShortStrings also store the length in string[0]. If I do a append, I
think the string will append to string[1]
So don't assume string are always initialized with null string?
Message: 5
Date: Sun, 7 Mar 2010 00:17:03 +0100
From: Mattias Gaertner nc-gaert...@netcologne.de
Subject: Re:
I have a a program that will read a string and parse the string to some
sub-strings in sub routine.
I add every character to a local string buffer in sub routine. The code
work well in delphi but suddenly fail in fpc.
When I watch the buffer, it display some garbage instead of null string when
On 06 Mar 2010, at 21:13, lyh1 wrote:
My question is we should always assign null string to variable before use or
this a bug if I get garbage in unused string?
If you want Delphi-compatible behaviour, you must add {$mode delphi} at the top
of your program. In the default mode, string is an
On 06 Mar 2010, at 22:03, Juha Manninen wrote:
If you want Delphi-compatible behaviour, you must add {$mode delphi} at the
top of your program. In the default mode, string is an alias for
shortstring instead of ansistring ({$h-} mode).
And even then you should initialize strings. They are
Hello FPC-Pascal,
Saturday, March 6, 2010, 10:03:49 PM, you wrote:
If you want Delphi-compatible behaviour, you must add {$mode delphi} at the
top of your program. In the default mode, string is an alias for
shortstring instead of ansistring ({$h-} mode).
JM And even then you should
Sorry ... What ? It must be garanteed in ansistring mode! or
everything will simple kboom! There is no way to initialize a non
initialized string.
By initializing I mean:
str:='';
or some other assignment.
I remember having garbage in strings in Delphi when I assumed they are empty.
Or was
I thought only global variables were initialized to zero and local
ones were just cereated on the stack?
Bart
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On 07 Mar 2010, at 00:13, Juha Manninen wrote:
I remember having garbage in strings in Delphi when I assumed they are empty.
Or was it only with function's string return value, I am not sure.
Anyway, after that I was careful to always assign my strings.
You're right that it can be different
On Sun, 7 Mar 2010 01:13:05 +0200
Juha Manninen juha.manni...@phnet.fi wrote:
Sorry ... What ? It must be garanteed in ansistring mode! or
everything will simple kboom! There is no way to initialize a non
initialized string.
By initializing I mean:
str:='';
or some other assignment.
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