1 /*
2 * Copyright (c) 1981, 1993, 1994
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30 #ifndef lint
31 static char sccsid[] = "@(#)overlay.c 8.2 (Berkeley) 5/4/94";
32 #endif /* not lint */
33
34 #include <ctype.h>
35
36 #include "curses.h"
37
38 /*
39 * overlay --
40 * Writes win1 on win2 non-destructively.
41 */
42 int
overlay(win1,win2)43 overlay(win1, win2)
44 register WINDOW *win1, *win2;
45 {
46
47 register int x, y, y1, y2, endy, endx, starty, startx;
48 register __LDATA *sp, *end;
49
50 #ifdef DEBUG
51 __CTRACE("overlay: (%0.2o, %0.2o);\n", win1, win2);
52 #endif
53 starty = max(win1->begy, win2->begy);
54 startx = max(win1->begx, win2->begx);
55 endy = min(win1->maxy + win1->begy, win2->maxy + win2->begx);
56 endx = min(win1->maxx + win1->begx, win2->maxx + win2->begx);
57 #ifdef DEBUG
58 __CTRACE("overlay: from (%d,%d) to (%d,%d)\n",
59 starty, startx, endy, endx);
60 #endif
61 if (starty >= endy || startx >= endx)
62 return (OK);
63 y1 = starty - win1->begy;
64 y2 = starty - win2->begy;
65 for (y = starty; y < endy; y++, y1++, y2++) {
66 end = &win1->lines[y1]->line[endx - win1->begx];
67 x = startx - win2->begx;
68 for (sp = &win1->lines[y1]->line[startx - win1->begx];
69 sp < end; sp++) {
70 if (!isspace(sp->ch)) {
71 wmove(win2, y2, x);
72 __waddch(win2, sp);
73 }
74 x++;
75 }
76 }
77 return (OK);
78 }
79