1.\" 2.\" Copyright (c) 2004 Tim J. Robbins 3.\" All rights reserved. 4.\" 5.\" Redistribution and use in source and binary forms, with or without 6.\" modification, are permitted provided that the following conditions 7.\" are met: 8.\" 1. Redistributions of source code must retain the above copyright 9.\" notice, this list of conditions and the following disclaimer. 10.\" 2. Redistributions in binary form must reproduce the above copyright 11.\" notice, this list of conditions and the following disclaimer in the 12.\" documentation and/or other materials provided with the distribution. 13.\" 14.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24.\" SUCH DAMAGE. 25.\" 26.\" $FreeBSD$ 27.\" 28.Dd September 3, 2009 29.Dt ISSPECIAL 3 30.Os 31.Sh NAME 32.Nm isspecial 33.Nd special character test 34.Sh LIBRARY 35.Lb libc 36.Sh SYNOPSIS 37.In ctype.h 38.Ft int 39.Fn isspecial "int c" 40.Sh DESCRIPTION 41The 42.Fn isspecial 43function tests for a special character. 44.Pp 45.Em NOTE : 46if the value passed to the 47.Fn isspecial 48function is a 49.Vt signed char , 50as is usually the case, it must be cast to an 51.Vt unsigned char 52to avoid sign-extension errors. 53.Sh RETURN VALUES 54The 55.Fn isspecial 56function returns zero if the character tests false and 57returns non-zero if the character tests true. 58.Sh SEE ALSO 59.Xr ctype 3 , 60.Xr iswspecial 3 61.Sh HISTORY 62The 63.Fn isspecial 64function appeared in 65.Bx 4.4 . 66