[libpayload] fix curses drawing problem

[Jordan Crouse]

This fixes a curses drawing problem - characters are getting
accidently sign extended, which is badness for drawing characters
(i.e chars with values >= 128).  This works around the problem so
the right values get sent to VGA.

[Uwe Hermann]

On Thu, Mar 27, 2008 at 03:34:50PM -0600, Jordan Crouse wrote:
> [libpayload] Work around sign-extending issue
>
> somewhere characters are getting sign-extended, meaning that the
> attributes of the drawing chars ( >= 128) are wrong.  Cast the value 
> before sending it to vga.
>
> Signed-off-by: Jordan Crouse

Acked-by: Uwe Hermann

Tested in QEMU.

Uwe.

[Uwe Hermann]

On Thu, Mar 27, 2008 at 11:12:35PM +0100, Uwe Hermann wrote:
> On Thu, Mar 27, 2008 at 03:34:50PM -0600, Jordan Crouse wrote:
> > [libpayload] Work around sign-extending issue
> >
> > somewhere characters are getting sign-extended, meaning that the
> > attributes of the drawing chars ( >= 128) are wrong.  Cast the value 
> > before sending it to vga.
> >
> > Signed-off-by: Jordan Crouse
>
> Acked-by: Uwe Hermann
>
> Tested in QEMU.

Also tested on hardware now. Committed in r3195.

Uwe.