| 1 | /* |
| 2 | * Copyright (c) 1981 Regents of the University of California. |
| 3 | * All rights reserved. |
| 4 | * |
| 5 | * Redistribution and use in source and binary forms are permitted |
| 6 | * provided that the above copyright notice and this paragraph are |
| 7 | * duplicated in all such forms and that any documentation, |
| 8 | * advertising materials, and other materials related to such |
| 9 | * distribution and use acknowledge that the software was developed |
| 10 | * by the University of California, Berkeley. The name of the |
| 11 | * University may not be used to endorse or promote products derived |
| 12 | * from this software without specific prior written permission. |
| 13 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR |
| 14 | * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED |
| 15 | * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. |
| 16 | */ |
| 17 | |
| 18 | #ifndef lint |
| 19 | static char sccsid[] = "@(#)overlay.c 5.5 (Berkeley) %G%"; |
| 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 | overlay(win1, win2) |
| 33 | reg WINDOW *win1, *win2; { |
| 34 | |
| 35 | reg char *sp, *end; |
| 36 | reg int x, y, endy, endx, starty, startx; |
| 37 | reg 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->_begx); |
| 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", starty, startx, endy, endx); |
| 48 | # endif |
| 49 | if (starty >= endy || startx >= endx) |
| 50 | return; |
| 51 | y1 = starty - win1->_begy; |
| 52 | y2 = starty - win2->_begy; |
| 53 | for (y = starty; y < endy; y++, y1++, y2++) { |
| 54 | end = &win1->_y[y1][endx - win1->_begx]; |
| 55 | x = startx - win2->_begx; |
| 56 | for (sp = &win1->_y[y1][startx - win1->_begx]; sp < end; sp++) { |
| 57 | if (!isspace(*sp)) |
| 58 | mvwaddch(win2, y2, x, *sp); |
| 59 | x++; |
| 60 | } |
| 61 | } |
| 62 | } |