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. 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.\" @(#)isspace.3 8.1 (Berkeley) 6/4/93 33.\" $FreeBSD: head/lib/libc/locale/isspace.3 238919 2012-07-30 20:56:19Z issyl0 $ 34.\" 35.Dd December 25, 2013 36.Dt ISSPACE 3 37.Os 38.Sh NAME 39.Nm isspace , 40.Nm isspace_l 41.Nd white-space character test 42.Sh LIBRARY 43.Lb libc 44.Sh SYNOPSIS 45.In ctype.h 46.Ft int 47.Fn isspace "int c" 48.Ft int 49.Fn isspace_l "int c" "locale_t locale" 50.Sh DESCRIPTION 51The 52.Fn isspace 53and 54.Fn isspace_l 55functions test for white-space characters. 56For any locale, this includes the following standard characters: 57.Bl -column \&`\et''___ \&``\et''___ \&``\et''___ \&``\et''___ \&``\et''___ \&``\et''___ 58.It "\&``\et''" Ta "``\en''" Ta "``\ev''" Ta "``\ef''" Ta "``\er''" Ta "`` ''" 59.El 60.Pp 61In the "C" locale, 62.Fn isspace 63and 64.Fn isspace_l 65return non-zero for these characters only. 66The value of the argument must be representable as an 67.Vt "unsigned char" 68or the value of 69.Dv EOF . 70.Pp 71The 72.Fn isspace_l 73function takes an explicit 74.Fa locale 75argument, whereas the 76.Fn isspace 77function uses the current global or per-thread locale. 78.Sh RETURN VALUES 79The 80.Fn isspace 81and 82.Fn isspace_l 83functions return zero if the character tests false and 84return non-zero if the character tests true. 85.Sh COMPATIBILITY 86The 87.Bx 4.4 88extension of accepting arguments outside of the range of the 89.Vt "unsigned char" 90type in locales with large character sets is considered obsolete 91and may not be supported in future releases. 92The 93.Fn iswspace 94and 95.Fn iswspace_l 96functions should be used instead. 97.Sh SEE ALSO 98.Xr ctype 3 , 99.Xr ctype_l 3 , 100.Xr iswspace 3 , 101.Xr iswspace_l 3 , 102.Xr multibyte 3 , 103.Xr xlocale 3 , 104.Xr ascii 7 105.Sh STANDARDS 106The 107.Fn isspace 108function conforms to 109.St -isoC . 110The 111.Fn isspace_l 112function conforms to 113.St -p1003.1-2008 . 114