4.3BSD-Tahoe/usr/src/usr.lib/libcurses/touchwin.c

/*
 * Copyright (c) 1981 Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted
 * provided that the above copyright notice and this paragraph are
 * duplicated in all such forms and that any documentation,
 * advertising materials, and other materials related to such
 * distribution and use acknowledge that the software was developed
 * by the University of California, Berkeley.  The name of the
 * University may not be used to endorse or promote products derived
 * from this software without specific prior written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */

#ifndef lint
static char sccsid[] = "@(#)touchwin.c	5.3 (Berkeley) 6/30/88";
#endif /* not lint */

# include	"curses.ext"

/*
 * make it look like the whole window has been changed.
 *
 */
touchwin(win)
register WINDOW	*win;
{
	register int	y, maxy;

# ifdef	DEBUG
	fprintf(outf, "TOUCHWIN(%0.2o)\n", win);
# endif
	maxy = win->_maxy;
	for (y = 0; y < maxy; y++)
		touchline(win, y, 0, win->_maxx - 1);
}

/*
 * touch a given line
 */
touchline(win, y, sx, ex)
register WINDOW	*win;
register int	y, sx, ex;
{
# ifdef DEBUG
	fprintf(outf, "TOUCHLINE(%0.2o, %d, %d, %d)\n", win, y, sx, ex);
	fprintf(outf, "TOUCHLINE:first = %d, last = %d\n", win->_firstch[y], win->_lastch[y]);
# endif
	sx += win->_ch_off;
	ex += win->_ch_off;
	if (win->_firstch[y] == _NOCHANGE) {
		win->_firstch[y] = sx;
		win->_lastch[y] = ex;
	}
	else {
		if (win->_firstch[y] > sx)
			win->_firstch[y] = sx;
		if (win->_lastch[y] < ex)
			win->_lastch[y] = ex;
	}
# ifdef	DEBUG
	fprintf(outf, "TOUCHLINE:first = %d, last = %d\n", win->_firstch[y], win->_lastch[y]);
# endif
}