1 /* $NetBSD: erase.c,v 1.33 2021/09/06 07:03:49 rin 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 1.33 2021/09/06 07:03:49 rin Exp $"); 38 #endif 39 #endif /* not lint */ 40 41 #include <stdlib.h> 42 43 #include "curses.h" 44 #include "curses_private.h" 45 46 #ifndef _CURSES_USE_MACROS 47 48 /* 49 * erase -- 50 * Erases everything on stdscr. 51 */ 52 int 53 erase(void) 54 { 55 return werase(stdscr); 56 } 57 58 #endif 59 60 /* 61 * werase -- 62 * Erases everything on the window. 63 */ 64 int 65 werase(WINDOW *win) 66 { 67 int y; 68 __LDATA *sp, *end, *start; 69 wchar_t bch; 70 attr_t battr; 71 72 __CTRACE(__CTRACE_ERASE, "werase: (%p)\n", win); 73 #ifdef HAVE_WCHAR 74 bch = (wchar_t)btowc((int)win->bch); 75 #else 76 bch = win->bch; 77 #endif 78 if (win != curscr) 79 battr = win->battr & __ATTRIBUTES; 80 else 81 battr = 0; 82 83 for (y = 0; y < win->maxy; y++) { 84 start = win->alines[y]->line; 85 end = &start[win->maxx]; 86 for (sp = start; sp < end; sp++) { 87 if (!(__NEED_ERASE(sp, bch, battr))) 88 continue; 89 90 sp->ch = bch; 91 sp->attr = battr | (sp->attr & __ALTCHARSET); 92 #ifdef HAVE_WCHAR 93 if (_cursesi_copy_nsp(win->bnsp, sp) == ERR) 94 return ERR; 95 SET_WCOL(*sp, 1); 96 #endif 97 } 98 } 99 100 /* 101 * Mark the whole window as changed in case we have overlapping 102 * windows - this will result in the (intended) clearing of the 103 * screen over the area covered by the window. */ 104 __touchwin(win); 105 wmove(win, 0, 0); 106 return OK; 107 } 108