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diff --git a/usr.bin/telnet/ring.h b/usr.bin/telnet/ring.h
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+/*
+ * Copyright (c) 1988, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ *	from: @(#)ring.h	8.1 (Berkeley) 6/6/93
+ *	$Id: ring.h,v 1.1 1995/10/18 08:46:14 deraadt Exp $
+ */
+
+#if defined(P)
+# undef P
+#endif
+
+#if defined(__STDC__) || defined(LINT_ARGS)
+# define	P(x)	x
+#else
+# define	P(x)	()
+#endif
+
+/*
+ * This defines a structure for a ring buffer.
+ *
+ * The circular buffer has two parts:
+ *(((
+ *	full:	[consume, supply)
+ *	empty:	[supply, consume)
+ *]]]
+ *
+ */
+typedef struct {
+    unsigned char	*consume,	/* where data comes out of */
+			*supply,	/* where data comes in to */
+			*bottom,	/* lowest address in buffer */
+			*top,		/* highest address+1 in buffer */
+			*mark;		/* marker (user defined) */
+    int		size;		/* size in bytes of buffer */
+    u_long	consumetime,	/* help us keep straight full, empty, etc. */
+		supplytime;
+} Ring;
+
+/* Here are some functions and macros to deal with the ring buffer */
+
+/* Initialization routine */
+extern int
+	ring_init P((Ring *ring, unsigned char *buffer, int count));
+
+/* Data movement routines */
+extern void
+	ring_supply_data P((Ring *ring, unsigned char *buffer, int count));
+#ifdef notdef
+extern void
+	ring_consume_data P((Ring *ring, unsigned char *buffer, int count));
+#endif
+
+/* Buffer state transition routines */
+extern void
+	ring_supplied P((Ring *ring, int count)),
+	ring_consumed P((Ring *ring, int count));
+
+/* Buffer state query routines */
+extern int
+	ring_empty_count P((Ring *ring)),
+	ring_empty_consecutive P((Ring *ring)),
+	ring_full_count P((Ring *ring)),
+	ring_full_consecutive P((Ring *ring));
+
+
+extern void
+    ring_clear_mark(),
+    ring_mark();