1.\" Copyright (c) 1991, 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" This code is derived from software contributed to Berkeley by 5.\" the American National Standards Committee X3, on Information 6.\" Processing Systems. 7.\" 8.\" Redistribution and use in source and binary forms, with or without 9.\" modification, are permitted provided that the following conditions 10.\" are met: 11.\" 1. Redistributions of source code must retain the above copyright 12.\" notice, this list of conditions and the following disclaimer. 13.\" 2. Redistributions in binary form must reproduce the above copyright 14.\" notice, this list of conditions and the following disclaimer in the 15.\" documentation and/or other materials provided with the distribution. 16.\" 3. All advertising materials mentioning features or use of this software 17.\" must display the following acknowledgement: 18.\" This product includes software developed by the University of 19.\" California, Berkeley and its contributors. 20.\" 4. Neither the name of the University nor the names of its contributors 21.\" may be used to endorse or promote products derived from this software 22.\" without specific prior written permission. 23.\" 24.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34.\" SUCH DAMAGE. 35.\" 36.\" @(#)isspace.3 8.1 (Berkeley) 6/4/93 37.\" $FreeBSD$ 38.\" 39.Dd October 6, 2002 40.Dt ISSPACE 3 41.Os 42.Sh NAME 43.Nm isspace 44.Nd white-space character test 45.Sh LIBRARY 46.Lb libc 47.Sh SYNOPSIS 48.In ctype.h 49.Ft int 50.Fn isspace "int c" 51.Sh DESCRIPTION 52The 53.Fn isspace 54function tests for the white-space characters. 55For any locale, this includes the following standard characters: 56.Pp 57.Bl -column \&`\et''___ \&``\et''___ \&``\et''___ \&``\et''___ \&``\et''___ \&``\et''___ 58.It "\&``\et''\t``\en''\t``\ev''\t``\ef''\t``\er''\t`` ''" 59.El 60.Pp 61In the "C" locale 62.Fn isspace 63successful test is limited to this characters only. 64For single C 65.Va char Ns s 66locales (see 67.Xr multibyte 3 ) 68the value of the argument is 69representable as an 70.Li unsigned char 71or the value of 72.Dv EOF . 73.Sh RETURN VALUES 74The 75.Fn isspace 76function returns zero if the character tests false and 77returns non-zero if the character tests true. 78.Sh COMPATIBILITY 79Although 80.Fn isspace 81accepts arguments outside of the range of the 82.Vt "unsigned char" 83type in locales with large character sets, 84this is a 85.Bx 4.4 86extension and the 87.Fn iswspace 88function should be used instead for maximum portability. 89.Sh SEE ALSO 90.Xr ctype 3 , 91.Xr iswspace 3 , 92.Xr multibyte 3 , 93.Xr ascii 7 94.Sh STANDARDS 95The 96.Fn isspace 97function conforms to 98.St -isoC . 99