1 /* $OpenBSD: lib_erase.c,v 1.3 2010/01/12 23:22:05 nicm Exp $ */ 2 3 /**************************************************************************** 4 * Copyright (c) 1998,2000,2001 Free Software Foundation, Inc. * 5 * * 6 * Permission is hereby granted, free of charge, to any person obtaining a * 7 * copy of this software and associated documentation files (the * 8 * "Software"), to deal in the Software without restriction, including * 9 * without limitation the rights to use, copy, modify, merge, publish, * 10 * distribute, distribute with modifications, sublicense, and/or sell * 11 * copies of the Software, and to permit persons to whom the Software is * 12 * furnished to do so, subject to the following conditions: * 13 * * 14 * The above copyright notice and this permission notice shall be included * 15 * in all copies or substantial portions of the Software. * 16 * * 17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS * 18 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * 19 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. * 20 * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, * 21 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR * 22 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR * 23 * THE USE OR OTHER DEALINGS IN THE SOFTWARE. * 24 * * 25 * Except as contained in this notice, the name(s) of the above copyright * 26 * holders shall not be used in advertising or otherwise to promote the * 27 * sale, use or other dealings in this Software without prior written * 28 * authorization. * 29 ****************************************************************************/ 30 31 /**************************************************************************** 32 * Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995 * 33 * and: Eric S. Raymond <esr@snark.thyrsus.com> * 34 * and: Thomas E. Dickey 1996-on * 35 ****************************************************************************/ 36 37 /* 38 ** lib_erase.c 39 ** 40 ** The routine werase(). 41 ** 42 */ 43 44 #include <curses.priv.h> 45 46 MODULE_ID("$Id: lib_erase.c,v 1.3 2010/01/12 23:22:05 nicm Exp $") 47 48 NCURSES_EXPORT(int) 49 werase(WINDOW *win) 50 { 51 int code = ERR; 52 int y; 53 NCURSES_CH_T blank; 54 NCURSES_CH_T *sp, *end, *start; 55 56 T((T_CALLED("werase(%p)"), win)); 57 58 if (win) { 59 blank = win->_nc_bkgd; 60 for (y = 0; y <= win->_maxy; y++) { 61 start = win->_line[y].text; 62 end = &start[win->_maxx]; 63 64 /* 65 * If this is a derived window, we have to handle the case where 66 * a multicolumn character extends into the window that we are 67 * erasing. 68 */ 69 if_WIDEC({ 70 if (isWidecExt(start[0])) { 71 int x = (win->_parent != 0) ? (win->_begx) : 0; 72 while (x-- > 0) { 73 if (isWidecBase(start[-1])) { 74 --start; 75 break; 76 } 77 --start; 78 } 79 } 80 }); 81 82 for (sp = start; sp <= end; sp++) 83 *sp = blank; 84 85 win->_line[y].firstchar = 0; 86 win->_line[y].lastchar = win->_maxx; 87 } 88 win->_curx = win->_cury = 0; 89 win->_flags &= ~_WRAPPED; 90 _nc_synchook(win); 91 code = OK; 92 } 93 returnCode(code); 94 } 95