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) 06/30/88"; 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 } 63