1 /*
2 * Copyright 2001 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 /*LINTLIBRARY*/
16
17 #ifndef lint
18 static char
19 sccsid[] = "@(#)overlay.c 1.9 89/07/13 SMI"; /* from UCB 5.2 86/02/12 */
20 #endif /* not lint */
21
22 #include "curses.ext"
23 #include <ctype.h>
24
25 #define min(a, b) ((a) < (b) ? (a) : (b))
26 #define max(a, b) ((a) > (b) ? (a) : (b))
27
28 /*
29 * This routine writes win1 on win2 non-destructively.
30 */
31
32 int
overlay(WINDOW * win1,WINDOW * win2)33 overlay(WINDOW *win1, WINDOW *win2)
34 {
35 char *sp, *end;
36 int x, y, endy, endx, starty, startx;
37 int y1, y2;
38
39 #ifdef DEBUG
40 fprintf(outf, "OVERLAY(%0.2o, %0.2o);\n", win1, win2);
41 #endif
42 starty = max(win1->_begy, win2->_begy);
43 startx = max(win1->_begx, win2->_begx);
44 endy = min(win1->_maxy + win1->_begy, win2->_maxy + win2->_begy);
45 endx = min(win1->_maxx + win1->_begx, win2->_maxx + win2->_begx);
46 #ifdef DEBUG
47 fprintf(outf, "OVERLAY:from (%d,%d) to (%d,%d)\n",
48 starty, startx, endy, endx);
49 #endif
50 if (starty >= endy || startx >= endx)
51 return (OK);
52 y1 = starty - win1->_begy;
53 y2 = starty - win2->_begy;
54 for (y = starty; y < endy; y++, y1++, y2++) {
55 end = &win1->_y[y1][endx - win1->_begx];
56 x = startx - win2->_begx;
57 for (sp = &win1->_y[y1][startx - win1->_begx]; sp < end; sp++) {
58 if (!isspace(*sp))
59 (void) mvwaddch(win2, y2, x, *sp);
60 x++;
61 }
62 }
63 return (OK);
64 }
65