derwin.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"
/*
* Make a derived window of an existing window. The two windows
* share the same character image.
* orig: the original window
* nl, nc: numbers of lines and columns
* by, bx: coordinates for upper-left corner of the derived
* window in the coord system of the parent window.
*/
WINDOW *
derwin(WINDOW *orig, int num_lines, int nc, int by, int bx)
{
int y;
WINDOW *win = (WINDOW *) NULL, *par;
chtype **w_y, **o_y;
#ifdef _VR3_COMPAT_CODE
_ochtype **w_y16, **o_y16;
#endif /* _VR3_COMPAT_CODE */
/* make sure window fits inside the original one */
if (by < 0 || (by + num_lines) > orig->_maxy || bx < 0 ||
(bx + nc) > orig->_maxx)
goto done;
if (nc == 0)
nc = orig->_maxx - bx;
if (num_lines == 0)
num_lines = orig->_maxy - by;
/* Create the window skeleton */
if ((win = _makenew(num_lines, nc, by + orig->_begy,
bx + orig->_begx)) == NULL)
goto done;
/* inheritance */
/*LINTED*/
win->_parx = (short) bx;
/*LINTED*/
win->_pary = (short) by;
win->_bkgd = orig->_bkgd;
win->_attrs = orig->_attrs;
w_y = win->_y;
o_y = orig->_y;
#ifdef _VR3_COMPAT_CODE
if (_y16update) {
int hby = by;
w_y16 = win ->_y16;
o_y16 = orig->_y16;
for (y = 0; y < num_lines; y++, hby++)
w_y16[y] = o_y16[hby] + bx;
}
#endif /* _VR3_COMPAT_CODE */
for (y = 0; y < num_lines; y++, by++)
w_y[y] = o_y[by] + bx;
win->_yoffset = orig->_yoffset;
/* update descendant number of ancestors */
win->_parent = orig;
for (par = win->_parent; par != NULL; par = par->_parent)
par->_ndescs += 1;
done:
return (win);
}