overlap.c revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
* 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*/
#include <sys/types.h>
#include "curses_inc.h"
/*
* This routine writes Srcwin on Dstwin.
* Only the overlapping region is copied.
*/
int
_overlap(WINDOW *Srcwin, WINDOW *Dstwin, int Overlay)
{
int sby, sbx, sey, sex, dby, dbx, dey, dex,
top, bottom, left, right;
#ifdef DEBUG
if (outf)
fprintf(outf, "OVERWRITE(0%o, 0%o);\n", Srcwin, Dstwin);
#endif /* DEBUG */
sby = Srcwin->_begy; dby = Dstwin->_begy;
sbx = Srcwin->_begx; dbx = Dstwin->_begx;
sey = sby + Srcwin->_maxy; dey = dby + Dstwin->_maxy;
sex = sbx + Srcwin->_maxx; dex = dbx + Dstwin->_maxx;
if (sey < dby || sby > dey || sex < dbx || sbx > dex)
return (ERR);
top = _MAX(sby, dby); bottom = _MIN(sey, dey);
left = _MAX(sbx, dbx); right = _MIN(sex, dex);
sby = top - sby; sbx = left - sbx;
dey = bottom - dby - 1; dex = right - dbx - 1;
dby = top - dby; dbx = left - dbx;
return (copywin(Srcwin, Dstwin, sby, sbx, dby, dbx, dey, dex, Overlay));
}