\"      $NetBSD: isspace.3,v 1.15 2012/10/03 19:28:44 wiz Exp $
\"
\" Copyright (c) 1991 The Regents of the University of California.
\" All rights reserved.
\"
\" This code is derived from software contributed to Berkeley by
\" the American National Standards Committee X3, on Information
\" Processing Systems.
\"
\" Redistribution and use in source and binary forms, with or without
\" modification, are permitted provided that the following conditions
\" are met:
\" 1. Redistributions of source code must retain the above copyright
\"    notice, this list of conditions and the following disclaimer.
\" 2. Redistributions in binary form must reproduce the above copyright
\"    notice, this list of conditions and the following disclaimer in the
\"    documentation and/or other materials provided with the distribution.
\" 3. Neither the name of the University nor the names of its contributors
\"    may be used to endorse or promote products derived from this software
\"    without specific prior written permission.
\"
\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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\"
\"     @(#)isspace.3    5.3 (Berkeley) 7/31/91
\"
Dd April 17, 2008
Dt ISSPACE 3
Os
Sh NAME
Nm isspace
Nd white-space character test
Sh LIBRARY
Lb libc
Sh SYNOPSIS
In ctype.h
Ft int
Fn isspace "int c"
Sh DESCRIPTION
The
Fn isspace
function tests for the standard white-space characters
\" or for any
\" of an implementation-defined set of characters
for which
Xr isalnum 3
is false.
The standard white-space characters are the following:
Pp
Bl -tag -width xxxxx -offset indent -compact
It Sq \0
Space character.
It Li \ef
Form feed.
It Li \en
New-line.
It Li \er
Carriage return.
It Li \et
Horizontal tab.
It Li \ev
Vertical tab.
El
Pp
In the
Em ``C''
locale,
Fn isspace
returns true only for the standard white-space characters.
Sh RETURN VALUES
The
Fn isspace
function returns zero if the character tests false and
returns non-zero if the character tests true.
Sh SEE ALSO
Xr ctype 3 ,
Xr isalnum 3 ,
Xr isalpha 3 ,
Xr isascii 3 ,
Xr isblank 3 ,
Xr iscntrl 3 ,
Xr isdigit 3 ,
Xr isgraph 3 ,
Xr islower 3 ,
Xr isprint 3 ,
Xr ispunct 3 ,
Xr isupper 3 ,
Xr isxdigit 3 ,
Xr stdio 3 ,
Xr toascii 3 ,
Xr tolower 3 ,
Xr toupper 3 ,
Xr ascii 7
Sh STANDARDS
The
Fn isspace
function conforms to
St -ansiC .
Sh CAVEATS
The argument to
Fn isspace
must be
Dv EOF
or representable as an
Vt unsigned char ;
otherwise, the behavior is undefined.
See the
Sx CAVEATS
section of
Xr ctype 3
for more details.

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