1 /**************************************************************************** 2 * Copyright 2020 Thomas E. Dickey * 3 * Copyright 1998-2009,2016 Free Software Foundation, Inc. * 4 * * 5 * Permission is hereby granted, free of charge, to any person obtaining a * 6 * copy of this software and associated documentation files (the * 7 * "Software"), to deal in the Software without restriction, including * 8 * without limitation the rights to use, copy, modify, merge, publish, * 9 * distribute, distribute with modifications, sublicense, and/or sell * 10 * copies of the Software, and to permit persons to whom the Software is * 11 * furnished to do so, subject to the following conditions: * 12 * * 13 * The above copyright notice and this permission notice shall be included * 14 * in all copies or substantial portions of the Software. * 15 * * 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS * 17 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * 18 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. * 19 * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, * 20 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR * 21 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR * 22 * THE USE OR OTHER DEALINGS IN THE SOFTWARE. * 23 * * 24 * Except as contained in this notice, the name(s) of the above copyright * 25 * holders shall not be used in advertising or otherwise to promote the * 26 * sale, use or other dealings in this Software without prior written * 27 * authorization. * 28 ****************************************************************************/ 29 30 /**************************************************************************** 31 * Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995 * 32 * and: Eric S. Raymond <esr@snark.thyrsus.com> * 33 * and: Thomas E. Dickey 1996-on * 34 ****************************************************************************/ 35 36 /* 37 ** lib_erase.c 38 ** 39 ** The routine werase(). 40 ** 41 */ 42 43 #include <curses.priv.h> 44 45 MODULE_ID("$Id: lib_erase.c,v 1.19 2020/02/02 23:34:34 tom Exp $") 46 47 NCURSES_EXPORT(int) 48 werase(WINDOW *win) 49 { 50 int code = ERR; 51 NCURSES_CH_T blank; 52 NCURSES_CH_T *start; 53 54 T((T_CALLED("werase(%p)"), (void *) win)); 55 56 if (win) { 57 NCURSES_CH_T *sp; 58 int y; 59 60 blank = win->_nc_bkgd; 61 for (y = 0; y <= win->_maxy; y++) { 62 NCURSES_CH_T *end; 63 64 start = win->_line[y].text; 65 end = &start[win->_maxx]; 66 67 /* 68 * If this is a derived window, we have to handle the case where 69 * a multicolumn character extends into the window that we are 70 * erasing. 71 */ 72 if_WIDEC({ 73 if (isWidecExt(start[0])) { 74 int x = (win->_parent != 0) ? (win->_begx) : 0; 75 while (x-- > 0) { 76 if (isWidecBase(start[-1])) { 77 --start; 78 break; 79 } 80 --start; 81 } 82 } 83 }); 84 85 for (sp = start; sp <= end; sp++) 86 *sp = blank; 87 88 win->_line[y].firstchar = 0; 89 win->_line[y].lastchar = win->_maxx; 90 } 91 win->_curx = win->_cury = 0; 92 win->_flags &= ~_WRAPPED; 93 _nc_synchook(win); 94 code = OK; 95 } 96 returnCode(code); 97 } 98