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.\" 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.\" @(#)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 July 30, 2012 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.In ctype.h 49.In xlocale.h 50.Ft int 51.Fn isspace_l "int c" "locale_t loc" 52.Sh DESCRIPTION 53The 54.Fn isspace 55function tests 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 63returns non-zero for these characters only. 64The value of the argument must be representable as an 65.Vt "unsigned char" 66or the value of 67.Dv EOF . 68.Pp 69The 70.Fn isspace_l 71function takes an explicit locale argument, whereas the 72.Fn isspace 73function uses the current global or per-thread locale. 74.Sh RETURN VALUES 75The 76.Fn isspace 77and 78.Fn isspace_l 79functions return zero if the character tests false and 80return non-zero if the character tests true. 81.Sh COMPATIBILITY 82The 83.Bx 4.4 84extension of accepting arguments outside of the range of the 85.Vt "unsigned char" 86type in locales with large character sets is considered obsolete 87and may not be supported in future releases. 88The 89.Fn iswspace 90function should be used instead. 91.Sh SEE ALSO 92.Xr ctype 3 , 93.Xr ctype_l 3 , 94.Xr iswspace 3 , 95.Xr multibyte 3 , 96.Xr xlocale 3 , 97.Xr ascii 7 98.Sh STANDARDS 99The 100.Fn isspace 101function conforms to 102.St -isoC . 103The 104.Fn isspace_l 105function conforms to 106.St -p1003.1-2008 . 107