.\"	$NetBSD: iscntrl.3,v 1.10 2003/08/07 16:42:52 agc Exp $
.\"
.\" Copyright (c) 1991 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.
.\"
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.\"    may be used to endorse or promote products derived from this software
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.\"     @(#)iscntrl.3	5.2 (Berkeley) 6/29/91
.\"
.Dd June 29, 1991
.Dt ISCNTRL 3
.Os
.Sh NAME
.Nm iscntrl
.Nd control character test
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.In ctype.h
.Ft int
.Fn iscntrl "int c"
.Sh DESCRIPTION
The
.Fn iscntrl
function tests for any control character.
.Sh RETURN VALUES
The
.Fn iscntrl
macro returns zero if the character tests false and
returns non-zero if the character tests true.
.Sh SEE ALSO
.Xr isalnum 3 ,
.Xr isalpha 3 ,
.Xr isascii 3 ,
.Xr isblank 3 ,
.Xr isdigit 3 ,
.Xr isgraph 3 ,
.Xr islower 3 ,
.Xr isprint 3 ,
.Xr ispunct 3 ,
.Xr isspace 3 ,
.Xr isupper 3 ,
.Xr isxdigit 3 ,
.Xr stdio 3 ,
.Xr toascii 3 ,
.Xr tolower 3 ,
.Xr toupper 3 ,
.Xr ascii 7
.Sh STANDARDS
The
.Fn iscntrl
function conforms to
.St -ansiC .
.Sh CAVEATS
The argument to
.Fn iscntrl
must be
.Dv EOF
or representable as an
.Li unsigned char ;
otherwise, the result is undefined.