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
20 static char
21 sccsid[] = "@(#)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 
35 int
36 overwrite(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