--- /dev/null
+++ Libc/Libc-1506.40.4/include/vis.h
@@ -0,0 +1,138 @@
+/*
+ * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
+ *
+ * @APPLE_LICENSE_HEADER_START@
+ * 
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this
+ * file.
+ * 
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
+ * 
+ * @APPLE_LICENSE_HEADER_END@
+ */
+/*	$NetBSD: vis.h,v 1.21 2013/02/20 17:01:15 christos Exp $	*/
+/*	$FreeBSD$	*/
+
+/*-
+ * Copyright (c) 1990, 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. 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.
+ *
+ *	@(#)vis.h	8.1 (Berkeley) 6/2/93
+ */
+
+#ifndef _VIS_H_
+#define	_VIS_H_
+
+#include <_types.h>
+#include <sys/_types/_size_t.h>
+
+/*
+ * to select alternate encoding format
+ */
+#define	VIS_OCTAL	0x0001	/* use octal \ddd format */
+#define	VIS_CSTYLE	0x0002	/* use \[nrft0..] where appropiate */
+
+/*
+ * to alter set of characters encoded (default is to encode all
+ * non-graphic except space, tab, and newline).
+ */
+#define	VIS_SP		0x0004	/* also encode space */
+#define	VIS_TAB		0x0008	/* also encode tab */
+#define	VIS_NL		0x0010	/* also encode newline */
+#define	VIS_WHITE	(VIS_SP | VIS_TAB | VIS_NL)
+#define	VIS_SAFE	0x0020	/* only encode "unsafe" characters */
+
+/*
+ * other
+ */
+#define	VIS_NOSLASH	0x0040	/* inhibit printing '\' */
+#define	VIS_HTTP1808	0x0080	/* http-style escape % hex hex */
+#define	VIS_HTTPSTYLE	0x0080	/* http-style escape % hex hex */
+#define	VIS_GLOB	0x0100	/* encode glob(3) magic characters */
+#define	VIS_MIMESTYLE	0x0200	/* mime-style escape = HEX HEX */
+#define	VIS_HTTP1866	0x0400	/* http-style &#num; or &string; */
+#define	VIS_NOESCAPE	0x0800	/* don't decode `\' */
+#define	_VIS_END	0x1000	/* for unvis */
+
+/*
+ * unvis return codes
+ */
+#define	UNVIS_VALID	 1	/* character valid */
+#define	UNVIS_VALIDPUSH	 2	/* character valid, push back passed char */
+#define	UNVIS_NOCHAR	 3	/* valid sequence, no character produced */
+#define	UNVIS_SYNBAD	-1	/* unrecognized escape sequence */
+#define	UNVIS_ERROR	-2	/* decoder in unknown state (unrecoverable) */
+
+/*
+ * unvis flags
+ */
+#define	UNVIS_END	_VIS_END	/* no more characters */
+
+#include <sys/cdefs.h>
+
+__BEGIN_DECLS
+char	*vis(char *, int, int, int);
+char	*nvis(char *, size_t, int, int, int);
+
+char	*svis(char *, int, int, int, const char *);
+char	*snvis(char *, size_t, int, int, int, const char *);
+
+int	strvis(char *, const char *, int);
+int	strnvis(char *, size_t, const char *, int);
+
+int	strsvis(char *, const char *, int, const char *);
+int	strsnvis(char *, size_t, const char *, int, const char *);
+
+int	strvisx(char *, const char *, size_t, int);
+int	strnvisx(char *, size_t, const char *, size_t, int);
+int 	strenvisx(char *, size_t, const char *, size_t, int, int *);
+
+int	strsvisx(char *, const char *, size_t, int, const char *);
+int	strsnvisx(char *, size_t, const char *, size_t, int, const char *);
+int	strsenvisx(char *, size_t, const char *, size_t , int, const char *,
+    int *);
+
+int	strunvis(char *, const char *);
+int	strnunvis(char *, size_t, const char *);
+
+int	strunvisx(char *, const char *, int);
+int	strnunvisx(char *, size_t, const char *, int);
+
+int	unvis(char *, int, int *, int);
+__END_DECLS
+
+#endif /* !_VIS_H_ */