Path: utzoo!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!usc!ucla-cs!elroy.jpl.nasa.gov!decwrl!sgi!rpw3@rigden.wpd.sgi.com
From: rpw3@rigden.wpd.sgi.com (Rob Warnock)
Newsgroups: comp.sys.sgi
Subject: Re: IRIS Keyboard & etc.
Message-ID: <52816@sgi.sgi.com>
Date: 6 Mar 90 06:06:46 GMT
References: <2715@fs1.cam.nist.gov>
Sender: rpw3@rigden.wpd.sgi.com
Reply-To: rpw3@rigden.UUCP (Robert P. Warnock)
Organization: Silicon Graphics, Inc., Mountain View, CA
Lines: 79

In article <2715@fs1.cam.nist.gov> blue@cam.nist.gov (Jim Blue) writes:
+---------------
| I have been active at RTFM, all 31 volumes (though most of them don't apply)
| but haven't found how to get the number of lines and columns inside a wsh.
| (getsize() gives the size in pixels, but not in lines and columns.) Since vi,
| among other programs knows how to do this, it must be possible.
+---------------

Well, I don't know about "vi", but when porting a "lines&columns" app
to an Iris recently, I found the more-or-less-standard Berkeley kernel
screen size stuff [fragments attached below] to work just fine. That
is, TIOCGWINSZ to get the size, and SIGWINCH to know when it changes.
Resizing by dragging on a corner "does the right thing". So "wsh" must
be telling the kernel.

-Rob

-----
Rob Warnock, MS-9U/510		rpw3@sgi.com		rpw3@pei.com
Silicon Graphics, Inc.		(415)335-1673		Protocol Engines, Inc.
2011 N. Shoreline Blvd.
Mountain View, CA  94039-7311

============== attachment: code fragments ==================================

#ifdef TIOCGWINSZ             /* try to get window size from kernel */
struct winsize winsize;
#ifdef SIGWINCH               /* and if changing dynamically, track it
int   onwinch();
#endif
#endif

==============

	...somewhere in main()...
#ifdef SIGWINCH
	signal(SIGWINCH, onwinch());
#endif

==============

	...wherever it is (in main()?) you try to find out screen size...
#ifdef TIOCGWINSZ
	if (ioctl(0, TIOCGWINSZ, &winsize) >= 0
		&& winsize.ws_row > 0            /* avoid common stty screwup */
		&& winsize.ws_col > 0 ) {
		MaxRow = winsize.ws_row - 1;	/* make 0-based */
		MaxCol = winsize.ws_col - 1;
	} else
#endif
        {	/* just use termcap size */
                MaxRow = tgetnum ("li") - 1;
                MaxCol = tgetnum ("co") - 1;
        }
	...do whatever calculations are needed based on the screen size...

==============

#ifdef SIGWINCH
onwinch()
{
	/*
	 * screen size changed -- do the right things
	 */
        if (ioctl(0, TIOCGWINSZ, &winsize) >= 0
         && winsize.ws_row > 0          /* avoid common stty screwup */
         && winsize.ws_col > 0 ) {
                MaxRow = winsize.ws_row - 1;
                MaxCol = winsize.ws_col - 1;
        } else {
                MaxRow = tgetnum ("li") - 1;
                MaxCol = tgetnum ("co") - 1;
        }
	...do whatever calculations for values that have to change because
	   the screen size changed, then...
	redraw();			/* clear and draw from scratch */
        signal(SIGWINCH, onwinch);	/* re-enable signal */
}
#endif