[A89] Re: Interrupts

To: "Assembly-89 List" <assembly-89@lists.ticalc.org>
Subject: [A89] Re: Interrupts
From: "Brett Simmers" <bsimmers@attbi.com>
Date: Sun, 14 Apr 2002 22:29:14 -0400
References: <005c01c1e1b6$279b4830$6401a8c0@lukeskywalker> <5.1.0.14.0.20020412132138.035a8250@pop.home.se> <5.1.0.14.0.20020414183242.00b74908@pop.home.se>
Reply-To: assembly-89@lists.ticalc.org


Thanks, that was the problem, I just figured it out half an hour before I
got your response.  I'm still getting used to C's handling of variables, it
can be quite confusing sometimes.

Brett
----- Original Message -----
From: "Olle Hedman" <alh@home.se>
To: <assembly-89@lists.ticalc.org>
Sent: Sunday, April 14, 2002 12:35 PM
Subject: [A89] Re: Interrupts


>
> At 20:10 2002-04-13, you wrote:
>
> >Thanks for the help, I got what I wanted working with the interrupts.  I
> >have a different problem now.  My game would keep generating an illegal
> >instruction after pressing enter to start the game.  I fiddled around
with
> >the code a lot, trying to locate the problem, and it seems to be sprintf
and
> >GrayOn clashing.  I use sprintf to prepare a string for DrawStr, then a
> >couple lines later, I turn on grayscale.  If I comment out the sprintf
line,
> >it will run fine.  I couldn't find anything in the TIGCC help or the list
> >archives, any ideas?
>
> It is most probable that, that the buffer you give to sprintf is too small
> for the generated result.
> Which results in sprintf writing outside the buffer, trashing some code,
> or, if the buffer is on stack, trashes the return adress.
> This will result in the execution of illegal code (either by jumping
> somewhere random in the memory, or plainly executing it).
>
>
>
> ///Olle
>
>

References:

[A89] Interrupts

From: "Brett Simmers" <bsimmers@attbi.com>

[A89] Re: Interrupts

From: Olle Hedman <alh@home.se>

[A89] Re: Interrupts

From: Olle Hedman <alh@home.se>