RE: [Opengc-devel] Debug-mode failure when built with VC7

[Tim C. <tim...@ge...>]

Steve:

    The source I am building is straight from CVS.

Tim

-----Original Message-----
From: ope...@li...
[mailto:ope...@li...]On Behalf Of Doyle,
Steven
Sent: Tuesday, April 27, 2004 12:02 AM
To: 'ope...@li...'
Subject: RE: [Opengc-devel] Debug-mode failure when built with VC7


Hi,

Yes I can also confirm this, I don't use the speed tape so it doesn't affect
me. I should of mentioned it before . Are what version of OGC are you using
?

Cheers

Steve

-----Original Message-----
From: Tim Crews [mailto:tim...@ge...] 
Sent: 26 April 2004 18:30
To: ope...@li...
Subject: [Opengc-devel] Debug-mode failure when built with VC7


Hello:

I have been building the OpenGC code under Microsoft Visual Studio .NET
(Version 7).  I am building the Debug target.  When I run it
under the debugger, I get frequent run-time error checks saying that the
stack frame is corrupted around the variable "buffer".

An example of this can be found in ogcBoeing777SpeedTape.cpp,
ogcBoeing777SpeedTape::Render, which declares

	char buffer[1];

and has many lines that look like this:

	sprintf( buffer, "%i", charSpd/100);

Even when the result of (charSpd/100) is one digit, sprintf is
null-terminating the string that it is writing to.  This is resulting
in a desired write to &(Buffer[0]), but also an undesired write to
&(Buffer[0])+1. I believe this is what the MSVC debugger is
complaining about, since it puts guard data around each variable on the
stack, and detects corruption of that guard data.

To confirm this, and modified the declaration of Buffer to look like this:

	char buffer[2];

and modified the sprintf code to look like this:

        buffer[1] = 255;
	sprintf( buffer, "%i", charSpd/100);

After stepping over the sprintf, sure enough buffer[1] is zero.

Tim Crews
GECO, Inc
Mesa, Arizona, USA



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