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diff --git a/ncurses/base/lib_ungetch.c b/ncurses/base/lib_ungetch.c
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+/****************************************************************************
+ * Copyright (c) 1998-2007,2008 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_ungetch.c
+**
+** The routine ungetch().
+**
+*/
+
+#include <curses.priv.h>
+
+MODULE_ID("$Id: lib_ungetch.c,v 1.10 2008/05/03 20:20:58 tom Exp $")
+
+#include <fifo_defs.h>
+
+#ifdef TRACE
+NCURSES_EXPORT(void)
+_nc_fifo_dump(SCREEN *sp)
+{
+ int i;
+ T(("head = %d, tail = %d, peek = %d", head, tail, peek));
+ for (i = 0; i < 10; i++)
+ T(("char %d = %s", i, _tracechar(sp->_fifo[i])));
+}
+#endif /* TRACE */
+
+NCURSES_EXPORT(int)
+_nc_ungetch(SCREEN *sp, int ch)
+{
+ int rc = ERR;
+
+ if (tail != -1) {
+ if (head == -1) {
+ head = 0;
+ t_inc();
+ peek = tail; /* no raw keys */
+ } else
+ h_dec();
+
+ sp->_fifo[head] = ch;
+ T(("ungetch %s ok", _tracechar(ch)));
+#ifdef TRACE
+ if (USE_TRACEF(TRACE_IEVENT)) {
+ _nc_fifo_dump(sp);
+ _nc_unlock_global(tracef);
+ }
+#endif
+ rc = OK;
+ }
+ return rc;
+}
+
+NCURSES_EXPORT(int)
+ungetch(int ch)
+{
+ T((T_CALLED("ungetch(%s)"), _tracechar(ch)));
+ returnCode(_nc_ungetch(SP, ch));
+}