/****************************************************************************
- * Copyright (c) 1998 Free Software Foundation, Inc. *
+ * Copyright (c) 1998-2005,2009 Free Software Foundation, Inc. *
* *
* Permission is hereby granted, free of charge, to any person obtaining a *
* copy of this software and associated documentation files (the *
/****************************************************************************
* Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995 *
* and: Eric S. Raymond <esr@snark.thyrsus.com> *
+ * and: Thomas E. Dickey 1996-on *
****************************************************************************/
-
/*
** lib_erase.c
**
#include <curses.priv.h>
-MODULE_ID("$Id: lib_erase.c,v 1.11 1998/02/11 12:13:54 tom Exp $")
+MODULE_ID("$Id: lib_erase.c,v 1.17 2009/10/24 22:32:29 tom Exp $")
-int werase(WINDOW *win)
+NCURSES_EXPORT(int)
+werase(WINDOW *win)
{
-int code = ERR;
-int y;
-chtype blank;
-chtype *sp, *end, *start;
+ int code = ERR;
+ int y;
+ NCURSES_CH_T blank;
+ NCURSES_CH_T *sp, *end, *start;
- T((T_CALLED("werase(%p)"), win));
+ T((T_CALLED("werase(%p)"), (void *) win));
- if (win) {
- blank = _nc_background(win);
- for (y = 0; y <= win->_maxy; y++) {
+ if (win) {
+ blank = win->_nc_bkgd;
+ for (y = 0; y <= win->_maxy; y++) {
start = win->_line[y].text;
end = &start[win->_maxx];
-
+
+ /*
+ * If this is a derived window, we have to handle the case where
+ * a multicolumn character extends into the window that we are
+ * erasing.
+ */
+ if_WIDEC({
+ if (isWidecExt(start[0])) {
+ int x = (win->_parent != 0) ? (win->_begx) : 0;
+ while (x-- > 0) {
+ if (isWidecBase(start[-1])) {
+ --start;
+ break;
+ }
+ --start;
+ }
+ }
+ });
+
for (sp = start; sp <= end; sp++)
- *sp = blank;
-
+ *sp = blank;
+
win->_line[y].firstchar = 0;
win->_line[y].lastchar = win->_maxx;
- }
- win->_curx = win->_cury = 0;
- win->_flags &= ~_WRAPPED;
- _nc_synchook(win);
- code = OK;
}
- returnCode(code);
+ win->_curx = win->_cury = 0;
+ win->_flags &= ~_WRAPPED;
+ _nc_synchook(win);
+ code = OK;
+ }
+ returnCode(code);
}