1.\" Copyright (c) 1991 The Regents of the University of California. 2.\" 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.\" from: @(#)isspace.3 5.3 (Berkeley) 7/31/91 37.\" $Id: isspace.3,v 1.2 1993/07/30 08:37:34 mycroft Exp $ 38.\" 39.Dd July 31, 1991 40.Dt ISSPACE 3 41.Os 42.Sh NAME 43.Nm isspace 44.Nd white-space character test 45.Sh SYNOPSIS 46.Fd #include <ctype.h> 47.Ft int 48.Fn isspace "int c" 49.Sh DESCRIPTION 50The 51.Fn isspace 52function tests for the standard white-space characters 53.\" or for any 54.\" of an implementation-defined set of characters 55for which 56.Xr isalnum 3 57is false. 58The standard white-space characters are the following: 59.Pp 60.Bl -tag -width xxxxx -offset indent -compact 61.It Sq \0 62Space character. 63.It Li \ef 64Form feed. 65.It Li \en 66New-line. 67.It Li \er 68Carriage return. 69.It Li \et 70Horizontal tab. 71.It Li \ev 72And vertical tab. 73.El 74.Pp 75In the 76.Em ``C'' 77locale, 78.Fn isspace 79returns true only for the standard white-space characters. 80.Sh RETURN VALUES 81The 82.Fn isspace 83macro returns zero if the character tests false and 84returns non-zero if the character tests true. 85.Sh SEE ALSO 86.Xr isascii 3 , 87.Xr isalnum 3 , 88.Xr isalpha 3 , 89.Xr iscntrl 3 , 90.Xr isdigit 3 , 91.Xr isgraph 3 , 92.Xr islower 3 , 93.Xr isprint 3 , 94.Xr ispunct 3 , 95.Xr isupper 3 , 96.Xr isxdigit 3 , 97.Xr toascii 3 , 98.Xr tolower 3 , 99.Xr toupper 3 , 100.Xr stdio 3 101.Xr ascii 7 102.Sh STANDARDS 103The 104.Fn isspace 105function conforms to 106.St -ansiC . 107