1 /* $OpenBSD: lib_erase.c,v 1.4 2023/10/17 09:52:08 nicm Exp $ */ 2 3 /**************************************************************************** 4 * Copyright 2020,2022 Thomas E. Dickey * 5 * Copyright 1998-2009,2016 Free Software Foundation, Inc. * 6 * * 7 * Permission is hereby granted, free of charge, to any person obtaining a * 8 * copy of this software and associated documentation files (the * 9 * "Software"), to deal in the Software without restriction, including * 10 * without limitation the rights to use, copy, modify, merge, publish, * 11 * distribute, distribute with modifications, sublicense, and/or sell * 12 * copies of the Software, and to permit persons to whom the Software is * 13 * furnished to do so, subject to the following conditions: * 14 * * 15 * The above copyright notice and this permission notice shall be included * 16 * in all copies or substantial portions of the Software. * 17 * * 18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS * 19 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * 20 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. * 21 * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, * 22 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR * 23 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR * 24 * THE USE OR OTHER DEALINGS IN THE SOFTWARE. * 25 * * 26 * Except as contained in this notice, the name(s) of the above copyright * 27 * holders shall not be used in advertising or otherwise to promote the * 28 * sale, use or other dealings in this Software without prior written * 29 * authorization. * 30 ****************************************************************************/ 31 32 /**************************************************************************** 33 * Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995 * 34 * and: Eric S. Raymond <esr@snark.thyrsus.com> * 35 * and: Thomas E. Dickey 1996-on * 36 ****************************************************************************/ 37 38 /* 39 ** lib_erase.c 40 ** 41 ** The routine werase(). 42 ** 43 */ 44 45 #include <curses.priv.h> 46 47 MODULE_ID("$Id: lib_erase.c,v 1.4 2023/10/17 09:52:08 nicm Exp $") 48 49 NCURSES_EXPORT(int) 50 werase(WINDOW *win) 51 { 52 int code = ERR; 53 NCURSES_CH_T *start; 54 55 T((T_CALLED("werase(%p)"), (void *) win)); 56 57 if (win) { 58 NCURSES_CH_T blank; 59 NCURSES_CH_T *sp; 60 int y; 61 62 blank = win->_nc_bkgd; 63 for (y = 0; y <= win->_maxy; y++) { 64 NCURSES_CH_T *end; 65 66 start = win->_line[y].text; 67 end = &start[win->_maxx]; 68 69 /* 70 * If this is a derived window, we have to handle the case where 71 * a multicolumn character extends into the window that we are 72 * erasing. 73 */ 74 if_WIDEC({ 75 if (isWidecExt(start[0])) { 76 int x = (win->_parent != 0) ? (win->_begx) : 0; 77 while (x-- > 0) { 78 if (isWidecBase(start[-1])) { 79 --start; 80 break; 81 } 82 --start; 83 } 84 } 85 }); 86 87 for (sp = start; sp <= end; sp++) 88 *sp = blank; 89 90 win->_line[y].firstchar = 0; 91 win->_line[y].lastchar = win->_maxx; 92 } 93 win->_curx = win->_cury = 0; 94 win->_flags &= ~_WRAPPED; 95 _nc_synchook(win); 96 code = OK; 97 } 98 returnCode(code); 99 } 100