Syslinux - Jun 2009 - menu system behaviour with empty config file

The behaviour of the menu system is odd when an empty / not existing config file
is specified:
the screen is cleared but not even the menu frame is displayed.

It seems to be a problem with run_menu() from menumain.c:

        if (top != prev_top) {
            draw_menu(entry, top, 1);
            display_help(me->helptext);
        } else if (entry != prev_entry) {
            draw_row(prev_entry - top + 4 + VSHIFT, entry, top, 0, 0);
            draw_row(entry - top + 4 + VSHIFT, entry, top, 0, 0);
            display_help(me->helptext);
        }

And we have entry = prev_entry = top = prev_top = -1.

- Sebastian

Sebastian Herbszt wrote:
> The behaviour of the menu system is odd when an empty / not existing
> config file is specified:
> the screen is cleared but not even the menu frame is displayed.
> 
> It seems to be a problem with run_menu() from menumain.c:
> 
>        if (top != prev_top) {
>            draw_menu(entry, top, 1);
>            display_help(me->helptext);
>        } else if (entry != prev_entry) {
>            draw_row(prev_entry - top + 4 + VSHIFT, entry, top, 0, 0);
>            draw_row(entry - top + 4 + VSHIFT, entry, top, 0, 0);
>            display_help(me->helptext);
>        }
> 
> And we have entry = prev_entry = top = prev_top = -1.
> 
Yes, it's an error condition and probably should just cause the menu to
exit (unless someone has a better idea.)

	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.