diff --git a/ncurses/base/key_defined.c b/ncurses/base/key_defined.c
new file mode 100644
index 0000000..759ad82
--- /dev/null
+++ b/ncurses/base/key_defined.c
@@ -0,0 +1,78 @@
+/****************************************************************************
+ * Copyright (c) 2003,2006 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, 2003                                          *
+ ****************************************************************************/
+
+#include <curses.priv.h>
+
+MODULE_ID("$Id: key_defined.c,v 1.6 2006/12/30 23:22:55 tom Exp $")
+
+static int
+find_definition(TRIES * tree, const char *str)
+{
+    TRIES *ptr;
+    int result = OK;
+
+    if (str != 0 && *str != '\0') {
+	for (ptr = tree; ptr != 0; ptr = ptr->sibling) {
+	    if (UChar(*str) == UChar(ptr->ch)) {
+		if (str[1] == '\0' && ptr->child != 0) {
+		    result = ERR;
+		} else if ((result = find_definition(ptr->child, str + 1))
+			   == OK) {
+		    result = ptr->value;
+		} else if (str[1] == '\0') {
+		    result = ERR;
+		}
+	    }
+	    if (result != OK)
+		break;
+	}
+    }
+    return (result);
+}
+
+/*
+ * Returns the keycode associated with the given string.  If none is found,
+ * return OK.  If the string is only a prefix to other strings, return ERR.
+ * Otherwise, return the keycode's value (neither OK/ERR).
+ */
+NCURSES_EXPORT(int)
+key_defined(const char *str)
+{
+    int code = ERR;
+
+    T((T_CALLED("key_defined(%s)"), _nc_visbuf(str)));
+    if (SP != 0 && str != 0) {
+	code = find_definition(SP->_keytry, str);
+    }
+
+    returnCode(code);
+}