OpenSolaris_b135/lib/libcurses/screen/ripoffline.c

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 1997 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*	Copyright (c) 1988 AT&T	*/
/*	  All Rights Reserved	*/

/*
 * University Copyright- Copyright (c) 1982, 1986, 1988
 * The Regents of the University of California
 * All Rights Reserved
 *
 * University Acknowledgment- Portions of this document are derived from
 * software developed by the University of California, Berkeley, and its
 * contributors.
 */

#pragma ident	"%Z%%M%	%I%	%E% SMI"

/*LINTLIBRARY*/

/*
 * This routine is used by initialization routines. It sets it up
 * such that a line is removed from the user's screen by initscr. This
 * function must be called BEFORE initscr. It works by leaving a cookie
 * which tells initscr to reduce the size of stdscr by one for each line
 * ripped off. This routine has been generalized so that other applications
 * can make use of it in a straightforward manner.
 */

#include <sys/types.h>
#include "curses_inc.h"

static	struct _ripdef
{
	int line;
	int (*initfunction)(WINDOW *, int);
} _ripstruct[5];

static char _ripcounter;

static	void
_init_rip_func(void)
{
	int	i, flag;

	for (i = 0; i < _ripcounter; i++) {
		LINES = --SP->lsize;
/*
 * We don't need to check for newwin returning NULL because even if
 * we did and broke from the for loop, the application's initfunction
 * would not be called and they would have a NULL window pointer.  Their
 * code would then blow up if they don't check it anyway.  Therefore,
 * we can send in the newwin and their code has to check for NULL in either
 * case.
 *
 * NOTE:  The application has the responsibilty to do a delwin !!!
 */
		(*_ripstruct[i].initfunction) (newwin(1, COLS,
		    ((flag = _ripstruct[i].line) > 0) ? 0 : LINES, 0), COLS);
		if (flag > 0)
		    SP->Yabove++;
	}
	_ripcounter = 0;
}

int
ripoffline(int line, int (*initfunction)(WINDOW *, int))
{
	if (_ripcounter < 5) {
		_ripstruct[_ripcounter].line = line;
		_ripstruct[_ripcounter++].initfunction = initfunction;
	}
	_rip_init = _init_rip_func;
	return (OK);
}