diff --git a/usr.man/man3/unvis.3 b/usr.man/man3/unvis.3
new file mode 100644
index 0000000..bdde430
--- /dev/null
+++ b/usr.man/man3/unvis.3
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+.\" Copyright (c) 1989, 1991, 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.
+.\"
+.\"     @(#)unvis.3	8.2 (Berkeley) 12/11/93
+.\"
+.TH UNVIS 3 "3 January 1999" GNO "Library Routines"
+.SH NAME
+.BR unvis ,
+.BR strunvis
+\- decode a visual representation of characters
+.SH SYNOPSIS
+.BR "#include <vis.h>"
+.sp 1
+int 
+.BR unvis
+.RI "(char *" cp ,
+.RI "int " c , 
+.RI "int *" astate ,
+.RI "int " flag )
+.br
+int 
+.BR strunvis
+.RI "(char *" dst ,
+.RI "const char *" src )
+.SH DESCRIPTION
+The
+.BR unvis
+and
+.BR strunvis
+functions
+are used to decode a visual representation of characters, as produced
+by the
+.BR vis (3)
+function, back into
+the original form.  Unvis is called with successive characters in
+.IR c 
+until a valid
+sequence is recognized, at which time the decoded character is
+available at the character pointed to by
+.IR cp .
+Strunvis decodes the
+characters pointed to by
+.IR src
+into the buffer pointed to by
+.IR dst .
+.PP
+The
+.BR strunvis
+function
+simply copies
+.IR src
+to
+.IR dst ,
+decoding any escape sequences along the way,
+and returns the number of characters placed into
+.IR dst ,
+or \-1 if an
+invalid escape sequence was detected.  The size of
+.IR dst
+should be
+equal to the size of
+.IR src
+(that is, no expansion takes place during
+decoding).
+.PP
+The
+.BR unvis
+function
+implements a state machine that can be used to decode an arbitrary
+stream of bytes.  All state associated with the bytes being decoded
+is stored outside the
+.BR unvis
+function (that is, a pointer to the state is passed in), so
+calls decoding different streams can be freely intermixed.  To
+start decoding a stream of bytes, first initialize an integer
+to zero.  Call
+.BR unvis
+with each successive byte, along with a pointer
+to this integer, and a pointer to a destination character.
+The
+.BR unvis
+function
+has several return codes that must be handled properly.  They are:
+.IP "0 (zero)"
+Another character is necessary; nothing has been recognized yet.
+.IP UNVIS_VALID	
+A valid character has been recognized and is available at the location
+pointed to by cp.
+.IP UNVIS_VALIDPUSH
+A valid character has been recognized and is available at the location
+pointed to by cp; however, the character currently passed in should
+be passed in again.
+.IP UNVIS_NOCHAR
+A valid sequence was detected, but no character was produced.  This
+return code is necessary to indicate a logical break between characters.
+.IP UNVIS_SYNBAD
+An invalid escape sequence was detected, or the decoder is in an
+unknown state.  The decoder is placed into the starting state.
+.PP
+When all bytes in the stream have been processed, call
+.BR unvis
+one more time with flag set to
+.IR UNVIS_END
+to extract any remaining character (the character passed in is ignored).
+.PP
+The following code fragment illustrates a proper use of
+.BR unvis .
+.nf
+
+int state = 0;
+char out;
+
+while ((ch = getchar()) != EOF) {
+again:
+	switch(unvis(&out, ch, &state, 0)) {
+	case 0:
+	case UNVIS_NOCHAR:
+		break;
+	case UNVIS_VALID:
+		(void) putchar(out);
+		break;
+	case UNVIS_VALIDPUSH:
+		(void) putchar(out);
+		goto again;
+	case UNVIS_SYNBAD:
+		(void)fprintf(stderr, "bad sequence!\n");
+	exit(1);
+	}
+}
+if (unvis(&out, (char)0, &state, UNVIS_END) == UNVIS_VALID)
+	(void) putchar(out);
+.fi
+.SH SEE ALSO
+.BR vis (1)
+.SH HISTORY
+The
+.BR unvis
+function
+first appeared in 4.4BSD.
diff --git a/usr.man/man3/vis.3 b/usr.man/man3/vis.3
new file mode 100644
index 0000000..eb505e6
--- /dev/null
+++ b/usr.man/man3/vis.3
@@ -0,0 +1,257 @@
+.\" Copyright (c) 1989, 1991, 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: @(#)vis.3	8.1 (Berkeley) 6/9/93
+.\"	$Id: vis.3,v 1.1 1999/01/07 05:17:24 gdr-ftp Exp $
+.\"
+.TH VIS 3 "3 January 1999" GNO "Library Routines"
+.SH NAME
+.BR vis
+\- visually encode characters
+.SH SYNOPSIS
+.BR "#include <vis.h>"
+.sp 1
+char *\fBvis\fR
+.RI "(char *" dst ,
+.RI "int " c ,
+.RI "int " flag ,
+.RI "int " nextc );
+.br
+int 
+.BR strvis
+.RI "(char *" dst ,
+.RI "const char *" src ,
+.RI "int " flag );
+.br
+int 
+.BR strvisx
+.RI "(char *" dst ,
+.RI "const char *" src ,
+.RI "size_t " len ,
+.RI "int " flag );
+.SH DESCRIPTION
+The
+.BR vis
+function copies into
+.IR dst
+a string which represents the character
+.IR c .
+If
+.IR c
+needs no encoding, it is copied in unaltered.  The string is
+null terminated, and a pointer to the end of the string is
+returned.  The maximum length of any encoding is four
+characters (not including the trailing
+NULL); 
+thus, when
+encoding a set of characters into a buffer, the size of the buffer should
+be four times the number of characters encoded, plus one for the trailing
+NULL.
+The flag parameter is used for altering the default range of
+characters considered for encoding and for altering the visual
+representation.
+The additional character,
+.IR nextc ,
+is only used when selecting the
+.IR VIS_CSTYLE
+encoding format (explained below).
+.PP
+The
+.BR strvis
+and
+.BR strvisx
+functions copy into
+.IR dst
+a visual representation of
+the string
+.IR src .
+The
+.BR strvis
+function encodes characters from
+.IR src
+up to the
+first
+NULL.
+The
+.BR strvisx
+function encodes exactly
+.IR len
+characters from
+.IR src
+(this
+is useful for encoding a block of data that may contain
+NULL's).
+Both forms
+NULL
+terminate
+.IR dst .
+The size of
+.IR dst
+must be four times the number
+of characters encoded from
+.IR src
+(plus one for the
+NULL). 
+Both
+forms return the number of characters in dst (not including
+the trailing
+NULL). 
+.PP
+The encoding is a unique, invertible representation comprised entirely of
+graphic characters; it can be decoded back into the original form using 
+the
+.BR unvis (3)
+or
+.BR strunvis (3)
+functions.
+.PP
+There are two parameters that can be controlled: the range of
+characters that are encoded, and the type
+of representation used.  
+By default, all non-graphic characters.
+except space, tab, and newline are encoded.
+(See
+.BR isgraph (3).)
+The following flags
+alter this:
+.IP VIS_SP
+Also encode space.
+.IP VIS_TAB		
+Also encode tab.
+.IP VIS_NL
+Also encode newline.
+.IP VIS_WHITE	
+Synonym for
+VIS_SP
+\&|
+VIS_TAB
+\&|
+VIS_NL .
+.IP VIS_SAFE	
+Only encode "unsafe" characters.  Unsafe means control
+characters which may cause common terminals to perform
+unexpected functions.  Currently this form allows space,
+tab, newline, backspace, bell, and return - in addition
+to all graphic characters - unencoded. 
+.PP
+There are three forms of encoding.
+All forms use the backslash character '\e' to introduce a special
+sequence; two backslashes are used to represent a real backslash.
+These are the visual formats:
+.de zb
+.br
+.in +0.8i
+..
+.de ze
+.sp 1
+.in -0.8i
+..
+.IP (default)
+Use an 'M'
+to represent meta characters (characters with the 8th
+bit set), and use carat
+.BR ^
+to represent control characters see
+.BR iscntrl (3).
+The following formats are used:
+.sp 1
+\e^C
+.zb
+Represents the control character
+.BR C .
+Spans characters '\e000' through '\e037',
+and '\e177' (as '\e^?').
+.ze
+\eM-C
+.zb
+Represents character
+.RB ' C '
+with the 8th bit set.
+Spans characters '\e241'
+through '\e376'.
+.ze
+\eM^C
+.zb
+Represents control character
+.BR C
+with the 8th bit set.
+Spans characters '\e200' through '\e237', and '\e377' (as '\eM^?').
+.ze
+\e040
+.zb
+Represents ASCII space.
+.ze
+\e240
+.zb
+Represents Meta-space.
+.ze
+.IP VIS_CSTYLE
+Use C-style backslash sequences to represent standard non-printable
+characters.
+The following sequences are used to represent the indicated characters:
+.nf
+
+     \\a - BEL (007)
+     \\b - BS (010)
+     \\f - NP (014)
+     \\n - NL (012)
+     \\r - CR (015)
+     \\t - HT (011)
+     \\v - VT (013)
+     \\0 - NULL (000)
+
+.fi
+.sp 1
+When using this format, the nextc parameter is looked at to determine
+if a NULL character can be encoded as '\\0' instead of '\\000'.  If
+.IR nextc
+is an octal digit, the latter representation is used to
+avoid ambiguity.
+.IP VIS_OCTAL
+Use a three digit octal sequence.  The form is '\\ddd' where
+.IR d
+represents an octal digit.
+.PP
+There is one additional flag,
+.IR VIS_NOSLASH ,
+which inhibits the
+doubling of backslashes and the backslash before the default
+format (that is, control characters are represented by '^C'
+and meta characters as 'M-C').
+With this flag set, the encoding is
+ambiguous and non-invertible.
+.SH SEE ALSO
+.BR unvis (1),
+.BR strunvis (3),
+.BR unvis (3)
+.SH HISTORY
+These functions first appeared in 4.4BSD.
+