1 /* $NetBSD: erase.c,v 1.17 2003/08/07 16:44:21 agc 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. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 #ifndef lint 34 #if 0 35 static char sccsid[] = "@(#)erase.c 8.2 (Berkeley) 5/4/94"; 36 #else 37 __RCSID("$NetBSD: erase.c,v 1.17 2003/08/07 16:44:21 agc Exp $"); 38 #endif 39 #endif /* not lint */ 40 41 #include "curses.h" 42 #include "curses_private.h" 43 44 #ifndef _CURSES_USE_MACROS 45 46 /* 47 * erase -- 48 * Erases everything on stdscr. 49 */ 50 int 51 erase(void) 52 { 53 return werase(stdscr); 54 } 55 56 #endif 57 58 /* 59 * werase -- 60 * Erases everything on the window. 61 */ 62 int 63 werase(WINDOW *win) 64 { 65 66 int minx, y; 67 __LDATA *sp, *end, *start, *maxx; 68 69 #ifdef DEBUG 70 __CTRACE("werase: (%p)\n", win); 71 #endif 72 #ifdef __GNUC__ 73 maxx = NULL; /* XXX gcc -Wuninitialized */ 74 #endif 75 for (y = 0; y < win->maxy; y++) { 76 minx = -1; 77 start = win->lines[y]->line; 78 end = &start[win->maxx]; 79 for (sp = start; sp < end; sp++) 80 if (sp->ch != ' ' || sp->attr != 0 || 81 sp->bch != win->bch || sp->battr != win->battr) { 82 maxx = sp; 83 if (minx == -1) 84 minx = sp - start; 85 sp->ch = ' '; 86 sp->bch = win->bch; 87 sp->attr = 0; 88 sp->battr = win->battr; 89 } 90 if (minx != -1) 91 __touchline(win, y, minx, maxx - win->lines[y]->line); 92 } 93 wmove(win, 0, 0); 94 return (OK); 95 } 96