Base version of ncurses-5.7 library
diff --git a/ncurses/base/keyok.c b/ncurses/base/keyok.c
new file mode 100644
index 0000000..ad8988c
--- /dev/null
+++ b/ncurses/base/keyok.c
@@ -0,0 +1,78 @@
+/****************************************************************************
+ * Copyright (c) 1998-2000,2006 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: Thomas E. Dickey 1997-on *
+ ****************************************************************************/
+
+#include <curses.priv.h>
+
+MODULE_ID("$Id: keyok.c,v 1.7 2006/12/30 16:22:33 tom Exp $")
+
+/*
+ * Enable (or disable) ncurses' interpretation of a keycode by adding (or
+ * removing) the corresponding 'tries' entry.
+ *
+ * Do this by storing a second tree of tries, which records the disabled keys.
+ * The simplest way to copy is to make a function that returns the string (with
+ * nulls set to 0200), then use that to reinsert the string into the
+ * corresponding tree.
+ */
+
+NCURSES_EXPORT(int)
+keyok(int c, bool flag)
+{
+ int code = ERR;
+ int count = 0;
+ char *s;
+
+ T((T_CALLED("keyok(%d,%d)"), c, flag));
+ if (c >= 0) {
+ unsigned ch = (unsigned) c;
+ if (flag) {
+ while ((s = _nc_expand_try(SP->_key_ok, ch, &count, 0)) != 0
+ && _nc_remove_key(&(SP->_key_ok), ch)) {
+ code = _nc_add_to_try(&(SP->_keytry), s, ch);
+ free(s);
+ count = 0;
+ if (code != OK)
+ break;
+ }
+ } else {
+ while ((s = _nc_expand_try(SP->_keytry, ch, &count, 0)) != 0
+ && _nc_remove_key(&(SP->_keytry), ch)) {
+ code = _nc_add_to_try(&(SP->_key_ok), s, ch);
+ free(s);
+ count = 0;
+ if (code != OK)
+ break;
+ }
+ }
+ }
+ returnCode(code);
+}