overlay.c revision 1.11
1/* $NetBSD: overlay.c,v 1.11 2000/04/11 13:57:10 blymn 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 39static char sccsid[] = "@(#)overlay.c 8.2 (Berkeley) 5/4/94"; 40#else 41__RCSID("$NetBSD: overlay.c,v 1.11 2000/04/11 13:57:10 blymn Exp $"); 42#endif 43#endif /* not lint */ 44 45#include <ctype.h> 46 47#include "curses.h" 48#include "curses_private.h" 49 50/* 51 * overlay -- 52 * Writes win1 on win2 non-destructively. 53 */ 54int 55overlay(win1, win2) 56 const WINDOW *win1; 57 WINDOW *win2; 58{ 59 60 int x, y, y1, y2, endy, endx, starty, startx; 61 __LDATA *sp, *end; 62 63#ifdef DEBUG 64 __CTRACE("overlay: (%0.2o, %0.2o);\n", win1, win2); 65#endif 66 starty = max(win1->begy, win2->begy); 67 startx = max(win1->begx, win2->begx); 68 endy = min(win1->maxy + win1->begy, win2->maxy + win2->begx); 69 endx = min(win1->maxx + win1->begx, win2->maxx + win2->begx); 70#ifdef DEBUG 71 __CTRACE("overlay: from (%d,%d) to (%d,%d)\n", 72 starty, startx, endy, endx); 73#endif 74 if (starty >= endy || startx >= endx) 75 return (OK); 76 y1 = starty - win1->begy; 77 y2 = starty - win2->begy; 78 for (y = starty; y < endy; y++, y1++, y2++) { 79 end = &win1->lines[y1]->line[endx - win1->begx]; 80 x = startx - win2->begx; 81 for (sp = &win1->lines[y1]->line[startx - win1->begx]; 82 sp < end; sp++) { 83 if (!isspace(sp->ch)) { 84 wmove(win2, y2, x); 85 __waddch(win2, sp); 86 } 87 x++; 88 } 89 } 90 return (OK); 91} 92