1 /* $NetBSD: overlay.c,v 1.8 1997/07/22 07:36:54 mikel Exp $ */ 2 3 /* 4 * Copyright (c) 1981, 1993, 1994 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <sys/cdefs.h> 37 #ifndef lint 38 #if 0 39 static char sccsid[] = "@(#)overlay.c 8.2 (Berkeley) 5/4/94"; 40 #else 41 __RCSID("$NetBSD: overlay.c,v 1.8 1997/07/22 07:36:54 mikel Exp $"); 42 #endif 43 #endif /* not lint */ 44 45 #include <ctype.h> 46 47 #include "curses.h" 48 49 /* 50 * overlay -- 51 * Writes win1 on win2 non-destructively. 52 */ 53 int 54 overlay(win1, win2) 55 register WINDOW *win1, *win2; 56 { 57 58 register int x, y, y1, y2, endy, endx, starty, startx; 59 register __LDATA *sp, *end; 60 61 #ifdef DEBUG 62 __CTRACE("overlay: (%0.2o, %0.2o);\n", win1, win2); 63 #endif 64 starty = max(win1->begy, win2->begy); 65 startx = max(win1->begx, win2->begx); 66 endy = min(win1->maxy + win1->begy, win2->maxy + win2->begx); 67 endx = min(win1->maxx + win1->begx, win2->maxx + win2->begx); 68 #ifdef DEBUG 69 __CTRACE("overlay: from (%d,%d) to (%d,%d)\n", 70 starty, startx, endy, endx); 71 #endif 72 if (starty >= endy || startx >= endx) 73 return (OK); 74 y1 = starty - win1->begy; 75 y2 = starty - win2->begy; 76 for (y = starty; y < endy; y++, y1++, y2++) { 77 end = &win1->lines[y1]->line[endx - win1->begx]; 78 x = startx - win2->begx; 79 for (sp = &win1->lines[y1]->line[startx - win1->begx]; 80 sp < end; sp++) { 81 if (!isspace(sp->ch)) { 82 wmove(win2, y2, x); 83 __waddch(win2, sp); 84 } 85 x++; 86 } 87 } 88 return (OK); 89 } 90