ncurses-4.2-990116

1 files changed, 76 insertions, 0 deletions

diff --git a/lib/libcurses/base/lib_ungetch.c b/lib/libcurses/base/lib_ungetch.c
new file mode 100644
index 00000000000..81b315d6a42
--- /dev/null
+++ b/lib/libcurses/base/lib_ungetch.c
@@ -0,0 +1,76 @@
+/*	$OpenBSD: lib_ungetch.c,v 1.1 1999/01/18 19:10:05 millert Exp $	*/
+
+/****************************************************************************
+ * Copyright (c) 1998 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>                         *
+ ****************************************************************************/
+
+/*
+**	lib_ungetch.c
+**
+**	The routine ungetch().
+**
+*/
+
+#include <curses.priv.h>
+
+MODULE_ID("$From: lib_ungetch.c,v 1.2 1998/02/11 12:13:56 tom Exp $")
+
+#include <fifo_defs.h>
+
+#ifdef TRACE
+void _nc_fifo_dump(void)
+{
+int i;
+	T(("head = %d, tail = %d, peek = %d", head, tail, peek));
+	for (i = 0; i < 10; i++)
+		T(("char %d = %s", i, _trace_key(SP->_fifo[i])));
+}
+#endif /* TRACE */
+
+int ungetch(int ch)
+{
+	if (tail == -1)
+		return ERR;
+	if (head == -1) {
+		head = 0;
+		t_inc()
+		peek = tail; /* no raw keys */
+	} else
+		h_dec();
+
+	SP->_fifo[head] = ch;
+	T(("ungetch %#x ok", ch));
+#ifdef TRACE
+	if (_nc_tracing & TRACE_IEVENT) _nc_fifo_dump();
+#endif
+	return OK;
+}