1/*
2 * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
3 * Use is subject to license terms.
4 */
5
6/*	Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T	*/
7/*	  All Rights Reserved  	*/
8
9/*
10 * Copyright (c) 1980 Regents of the University of California.
11 * All rights reserved.  The Berkeley software License Agreement
12 * specifies the terms and conditions for redistribution.
13 */
14
15#pragma ident	"%Z%%M%	%I%	%E% SMI"
16
17/*LINTLIBRARY*/
18
19#ifndef lint
20static char
21sccsid[] = "@(#)overwrite.c 1.7 88/02/08 SMI"; /* from UCB 5.1 85/06/07 */
22#endif	/* not lint */
23
24#include	"curses.ext"
25#include	<ctype.h>
26#include	<string.h>
27
28#define	min(a, b)	((a) < (b) ? (a) : (b))
29#define	max(a, b)	((a) > (b) ? (a) : (b))
30
31/*
32 *	This routine writes win1 on win2 destructively.
33 */
34
35int
36overwrite(WINDOW *win1, WINDOW *win2)
37{
38	int	x, y, endy, endx, starty, startx;
39
40#ifdef DEBUG
41	fprintf(outf, "OVERWRITE(%0.2o, %0.2o);\n", win1, win2);
42#endif
43	starty = max(win1->_begy, win2->_begy);
44	startx = max(win1->_begx, win2->_begx);
45	endy = min(win1->_maxy + win1->_begy, win2->_maxy + win2->_begy);
46	endx = min(win1->_maxx + win1->_begx, win2->_maxx + win2->_begx);
47	if (starty >= endy || startx >= endx)
48		return (OK);
49#ifdef DEBUG
50	fprintf(outf, "OVERWRITE:from (%d,%d) to (%d,%d)\n",
51	    starty, startx, endy, endx);
52#endif
53	x = endx - startx;
54	for (y = starty; y < endy; y++) {
55		(void) memmove(&win2->_y[y - win2->_begy][startx - win2->_begx],
56		    &win1->_y[y - win1->_begy][startx - win1->_begx], x);
57		(void) touchline(win2, y, startx - win2->_begx,
58		    endx - win2->_begx);
59	}
60	return (OK);
61}
62