1.\" Copyright (c) 1991, 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 3. All advertising materials mentioning features or use of this software 13.\" must display the following acknowledgement: 14.\" This product includes software developed by the University of 15.\" California, Berkeley and its contributors. 16.\" 4. Neither the name of the University nor the names of its contributors 17.\" may be used to endorse or promote products derived from this software 18.\" without specific prior written permission. 19.\" 20.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30.\" SUCH DAMAGE. 31.\" 32.\" @(#)isblank.3 8.1 (Berkeley) 6/4/93 33.\" $FreeBSD: src/lib/libc/locale/isblank.3,v 1.4.2.3 2001/12/14 18:33:54 ru Exp $ 34.\" $DragonFly: src/lib/libc/locale/Attic/isblank.3,v 1.2 2003/06/17 04:26:44 dillon Exp $ 35.\" 36.Dd June 4, 1993 37.Dt ISBLANK 3 38.Os 39.Sh NAME 40.Nm isblank 41.Nd space or tab character test 42.Sh LIBRARY 43.Lb libc 44.Sh SYNOPSIS 45.In ctype.h 46.Ft int 47.Fn isblank "int c" 48.Sh DESCRIPTION 49The 50.Fn isblank 51function tests for a space or tab character. 52For single C 53.Va char Ns s 54locales (see 55.Xr multibyte 3 ) 56the value of the argument is 57representable as an 58.Li unsigned char 59or the value of 60.Dv EOF . 61.Sh RETURN VALUES 62The 63.Fn isblank 64function returns zero if the character tests false and 65returns non-zero if the character tests true. 66.Sh SEE ALSO 67.Xr ctype 3 , 68.Xr multibyte 3 , 69.Xr ascii 7 70