1.\" $OpenBSD: isspace.3,v 1.13 2013/07/17 05:42:11 schwarze Exp $ 2.\" 3.\" Copyright (c) 1991 The Regents of the University of California. 4.\" All rights reserved. 5.\" 6.\" This code is derived from software contributed to Berkeley by 7.\" the American National Standards Committee X3, on Information 8.\" Processing Systems. 9.\" 10.\" Redistribution and use in source and binary forms, with or without 11.\" modification, are permitted provided that the following conditions 12.\" are met: 13.\" 1. Redistributions of source code must retain the above copyright 14.\" notice, this list of conditions and the following disclaimer. 15.\" 2. Redistributions in binary form must reproduce the above copyright 16.\" notice, this list of conditions and the following disclaimer in the 17.\" documentation and/or other materials provided with the distribution. 18.\" 3. Neither the name of the University nor the names of its contributors 19.\" may be used to endorse or promote products derived from this software 20.\" without specific prior written permission. 21.\" 22.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32.\" SUCH DAMAGE. 33.\" 34.Dd $Mdocdate: July 17 2013 $ 35.Dt ISSPACE 3 36.Os 37.Sh NAME 38.Nm isspace 39.Nd whitespace character test 40.Sh SYNOPSIS 41.In ctype.h 42.Ft int 43.Fn isspace "int c" 44.Sh DESCRIPTION 45The 46.Fn isspace 47function tests for the standard whitespace characters 48.\" or for any 49.\" of an implementation-defined set of characters 50for which 51.Xr isalnum 3 52is false. 53The standard whitespace characters are the following: 54.Pp 55.Bl -tag -width xxxxx -offset indent -compact 56.It Sq \0 57Space character. 58.It Li \ef 59Form feed. 60.It Li \en 61New-line. 62.It Li \er 63Carriage return. 64.It Li \et 65Horizontal tab. 66.It Li \ev 67And vertical tab. 68.El 69.Pp 70In the C locale, 71.Fn isspace 72returns true only for the standard whitespace characters. 73.Sh RETURN VALUES 74The 75.Fn isspace 76function returns zero if the character tests false or 77non-zero if the character tests true. 78.Sh SEE ALSO 79.Xr isalnum 3 , 80.Xr isalpha 3 , 81.Xr isascii 3 , 82.Xr isblank 3 , 83.Xr iscntrl 3 , 84.Xr isdigit 3 , 85.Xr isgraph 3 , 86.Xr islower 3 , 87.Xr isprint 3 , 88.Xr ispunct 3 , 89.Xr isupper 3 , 90.Xr isxdigit 3 , 91.Xr stdio 3 , 92.Xr toascii 3 , 93.Xr tolower 3 , 94.Xr toupper 3 , 95.Xr ascii 7 96.Sh STANDARDS 97The 98.Fn isspace 99function conforms to 100.St -ansiC . 101.Sh HISTORY 102The 103.Fn isspace 104function first appeared in 105.At v7 . 106.Sh CAVEATS 107The argument to 108.Fn isspace 109must be 110.Dv EOF 111or representable as an 112.Li unsigned char ; 113otherwise, the result is undefined. 114