Base version of ncurses-5.7 library
diff --git a/ncurses/base/lib_erase.c b/ncurses/base/lib_erase.c
new file mode 100644
index 0000000..2566e8b
--- /dev/null
+++ b/ncurses/base/lib_erase.c
@@ -0,0 +1,92 @@
+/****************************************************************************
+ * Copyright (c) 1998,2000,2001 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 *
+ * "Software"), to deal in the Software without restriction, including *
+ * without limitation the rights to use, copy, modify, merge, publish, *
+ * distribute, distribute with modifications, sublicense, and/or sell *
+ * copies of the Software, and to permit persons to whom the Software is *
+ * furnished to do so, subject to the following conditions: *
+ * *
+ * The above copyright notice and this permission notice shall be included *
+ * in all copies or substantial portions of the Software. *
+ * *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS *
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF *
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. *
+ * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, *
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR *
+ * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR *
+ * THE USE OR OTHER DEALINGS IN THE SOFTWARE. *
+ * *
+ * Except as contained in this notice, the name(s) of the above copyright *
+ * holders shall not be used in advertising or otherwise to promote the *
+ * sale, use or other dealings in this Software without prior written *
+ * authorization. *
+ ****************************************************************************/
+
+/****************************************************************************
+ * 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
+**
+** The routine werase().
+**
+*/
+
+#include <curses.priv.h>
+
+MODULE_ID("$Id: lib_erase.c,v 1.16 2005/10/30 00:36:36 tom Exp $")
+
+NCURSES_EXPORT(int)
+werase(WINDOW *win)
+{
+ int code = ERR;
+ int y;
+ NCURSES_CH_T blank;
+ NCURSES_CH_T *sp, *end, *start;
+
+ T((T_CALLED("werase(%p)"), win));
+
+ 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;
+
+ 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);
+}