Re: [Qemu-devel] [PATCH] ncurses: resize console if required

[Carlo Marcelo Arenas Belon <carenas@sajinet.com.pe>]

On Mon, Apr 28, 2008 at 09:58:27AM +0100, Samuel Thibault wrote:
> Hello,
> 
> Carlo Marcelo Arenas Belon, le Sun 27 Apr 2008 22:54:45 -0500, a écrit :
> > The following patch instructs qemu to print an escape command to resize the
> > curses console to 80x25 if detected to have a different geometry (xterm and
> > friends use 80x24 by default).
> 
> > +    /* check size of console and try to adjust if needed */
> > +    getmaxyx(stdscr, gheight, gwidth);
> > +    if ((gwidth != 80) || (gheight != 25)) {
> > +	printf("\033[8;25;80t");
> > +    }
> 
> You can not just spit out escape sequences like this without know the
> kind of terminal you're in, you know :)

my original patch was checking the TERM variable for xterm or rxvt but since
CSI Window manipulation comes from dtterm I would expect most terminal
emulators to support that, do you have one that does not?

in the case of xterm with allowWindowOps = false the escape string gets just
ignored with no visible output, so expected the same from a terminal that
doesn't support it, but since it seems all the terminals I have access to do,
wasn't able to test that.

> At least check the TERM environment variable for those kind you know
> support it.  Also, this should probably go inside the curses_resize()
> function, so that when the guest resizes to e.g. 80x50, the xterm window
> gets resized too.

from my tests, while booting a linux guest, curses_resize will be called with
a 66 x 3 geometry at least once, and a first attempt to make the guest use a
resized console of 80x50 didn't reflect correctly in the curses side either so
I settled for this different implementation as a starting point, and that
solves the problem with default sized xterm used as a curses console.

my intention with this patch was to propose a simple solution to this problem
and hopefully get someone else with more experience in curses and terminal
emulations intrigued enough to give it a more complete spin.

Carlo