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+/* $OpenBSD: vis.h,v 1.15 2015/07/20 01:52:27 millert Exp $ */
+/* $NetBSD: vis.h,v 1.4 1994/10/26 00:56:41 cgd Exp $ */
+
+/*-
+ * Copyright (c) 1990 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 5.9 (Berkeley) 4/3/91
+ */
+
+#ifndef _VIS_H_
+#define _VIS_H_
+
+/*
+ * to select alternate encoding format
+ */
+#define VIS_OCTAL 0x01 /* use octal \ddd format */
+#define VIS_CSTYLE 0x02 /* use \[nrft0..] where appropriate */
+
+/*
+ * to alter set of characters encoded (default is to encode all
+ * non-graphic except space, tab, and newline).
+ */
+#define VIS_SP 0x04 /* also encode space */
+#define VIS_TAB 0x08 /* also encode tab */
+#define VIS_NL 0x10 /* also encode newline */
+#define VIS_WHITE (VIS_SP | VIS_TAB | VIS_NL)
+#define VIS_SAFE 0x20 /* only encode "unsafe" characters */
+#define VIS_DQ 0x200 /* backslash-escape double quotes */
+#define VIS_ALL 0x400 /* encode all characters */
+
+/*
+ * other
+ */
+#define VIS_NOSLASH 0x40 /* inhibit printing '\' */
+#define VIS_GLOB 0x100 /* encode glob(3) magics and '#' */
+
+/*
+ * 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 1 /* no more characters */
+
+#include <sys/cdefs.h>
+
+__BEGIN_DECLS
+char *vis(char *, int, int, int);
+int strvis(char *, const char *, int);
+int stravis(char **, const char *, int);
+int strnvis(char *, const char *, size_t, int)
+ __attribute__ ((__bounded__(__string__,1,3)));
+int strvisx(char *, const char *, size_t, int)
+ __attribute__ ((__bounded__(__string__,1,3)));
+int strunvis(char *, const char *);
+int unvis(char *, char, int *, int);
+ssize_t strnunvis(char *, const char *, size_t)
+ __attribute__ ((__bounded__(__string__,1,3)));
+
+__END_DECLS
+
+#endif /* !_VIS_H_ */