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+.\" Copyright (c) 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" This code is derived from software contributed to Berkeley by
+.\" the American National Standards Committee X3, on Information
+.\" Processing Systems.
+.\"
+.\" 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.
+.\"
+.\"     @(#)iscntrl.3	8.1 (Berkeley) 6/4/93
+.\"
+.Dd June 4, 1993
+.Dt ISCNTRL 3
+.Os
+.Sh NAME
+.Nm iscntrl
+.Nd control character test
+.Sh SYNOPSIS
+.Fd #include <ctype.h>
+.Ft int
+.Fn iscntrl "int c";
+.Sh DESCRIPTION
+The
+.Fn iscntrl
+function tests for any control character.
+In the ASCII character set, this includes the following characters:
+.sp
+.Bl -column \&000_``0''__ \&000_``0''__ \&000_``0''__ \&000_``0''__ \&000_``0''__
+.It \&000\ nul \t001\ soh \t002\ stx \t003\ etx \t004\ eot
+.It \&005\ enq \t006\ ack \t007\ bel \t010\ bs \t011\ ht
+.It \&012\ nl \t013\ vt \t014\ np \t015\ cr \t016\ so
+.It \&017\ si \t020\ dle \t021\ dc1 \t022\ dc2 \t023\ dc3
+.It \&024\ dc4 \t025\ nak \t026\ syn \t027\ etb \t030\ can
+.It \&031\ em \t032\ sub \t033\ esc \t034\ fs \t035\ gs
+.It \&036\ rs \t037\ us \t177\ del
+.El
+.Sh RETURN VALUES
+The
+.Fn iscntrl
+function returns zero if the character tests false and
+returns non-zero if the character tests true.
+.Sh SEE ALSO
+.Xr ctype 3 ,
+.Xr ascii 7
+.Sh STANDARDS
+The
+.Fn iscntrl
+function conforms to
+.St -ansiC .