1/**************************************************************************** 2 * Copyright (c) 1998,2000,2001 Free Software Foundation, Inc. * 3 * * 4 * Permission is hereby granted, free of charge, to any person obtaining a * 5 * copy of this software and associated documentation files (the * 6 * "Software"), to deal in the Software without restriction, including * 7 * without limitation the rights to use, copy, modify, merge, publish, * 8 * distribute, distribute with modifications, sublicense, and/or sell * 9 * copies of the Software, and to permit persons to whom the Software is * 10 * furnished to do so, subject to the following conditions: * 11 * * 12 * The above copyright notice and this permission notice shall be included * 13 * in all copies or substantial portions of the Software. * 14 * * 15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS * 16 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * 17 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. * 18 * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, * 19 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR * 20 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR * 21 * THE USE OR OTHER DEALINGS IN THE SOFTWARE. * 22 * * 23 * Except as contained in this notice, the name(s) of the above copyright * 24 * holders shall not be used in advertising or otherwise to promote the * 25 * sale, use or other dealings in this Software without prior written * 26 * authorization. * 27 ****************************************************************************/ 28 29/**************************************************************************** 30 * Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995 * 31 * and: Eric S. Raymond <esr@snark.thyrsus.com> * 32 * and: Thomas E. Dickey 1996-on * 33 ****************************************************************************/ 34 35/* 36** lib_erase.c 37** 38** The routine werase(). 39** 40*/ 41 42#include <curses.priv.h> 43 44MODULE_ID("$Id: lib_erase.c,v 1.16 2005/10/30 00:36:36 tom Exp $") 45 46NCURSES_EXPORT(int) 47werase(WINDOW *win) 48{ 49 int code = ERR; 50 int y; 51 NCURSES_CH_T blank; 52 NCURSES_CH_T *sp, *end, *start; 53 54 T((T_CALLED("werase(%p)"), win)); 55 56 if (win) { 57 blank = win->_nc_bkgd; 58 for (y = 0; y <= win->_maxy; y++) { 59 start = win->_line[y].text; 60 end = &start[win->_maxx]; 61 62 /* 63 * If this is a derived window, we have to handle the case where 64 * a multicolumn character extends into the window that we are 65 * erasing. 66 */ 67 if_WIDEC({ 68 if (isWidecExt(start[0])) { 69 int x = (win->_parent != 0) ? (win->_begx) : 0; 70 while (x-- > 0) { 71 if (isWidecBase(start[-1])) { 72 --start; 73 break; 74 } 75 --start; 76 } 77 } 78 }); 79 80 for (sp = start; sp <= end; sp++) 81 *sp = blank; 82 83 win->_line[y].firstchar = 0; 84 win->_line[y].lastchar = win->_maxx; 85 } 86 win->_curx = win->_cury = 0; 87 win->_flags &= ~_WRAPPED; 88 _nc_synchook(win); 89 code = OK; 90 } 91 returnCode(code); 92} 93