.\" Copyright (c) Bruno Haible <haible@clisp.cons.org>
.\"
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.\" This is free documentation; you can redistribute it and/or
.\" modify it under the terms of the GNU General Public License as
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.\"
.\" References consulted:
.\"   GNU glibc-2 source code and manual
.\"   Dinkumware C library reference http://www.dinkumware.com/
.\"   OpenGroup's Single UNIX specification http://www.UNIX-systems.org/online.html
.\"   ISO/IEC 9899:1999
.\"
.TH ISWBLANK 3  2019-03-06 "GNU" "Linux Programmer's Manual"
.SH NAME
iswblank \- test for whitespace wide character
.SH SYNOPSIS
.nf
.B #include <wctype.h>
.PP
.BI "int iswblank(wint_t " wc );
.fi
.PP
.in -4n
Feature Test Macro Requirements for glibc (see
.BR feature_test_macros (7)):
.in
.PP
.ad l
.BR iswblank ():
.RS
_ISOC99_SOURCE || _POSIX_C_SOURCE\ >=\ 200112L
.RE
.ad
.SH DESCRIPTION
The
.BR iswblank ()
function is the wide-character equivalent of the
.BR isblank (3)
function.
It tests whether \fIwc\fP is a wide character
belonging to the wide-character class "blank".
.PP
The wide-character class "blank" is a subclass of the wide-character class
"space".
.PP
Being a subclass of the wide-character class "space",
the wide-character class "blank" is disjoint from the
wide-character class "graph" and therefore also disjoint
from its subclasses "alnum", "alpha", "upper", "lower", "digit",
"xdigit", "punct".
.PP
The wide-character class "blank" always contains
at least the space character
and the control character \(aq\et\(aq.
.SH RETURN VALUE
The
.BR iswblank ()
function returns nonzero
if \fIwc\fP is a wide character
belonging to the wide-character class "blank".
Otherwise, it returns zero.
.SH ATTRIBUTES
For an explanation of the terms used in this section, see
.BR attributes (7).
.TS
allbox;
lb lb lb
l l l.
Interface	Attribute	Value
T{
.BR iswblank ()
T}	Thread safety	MT-Safe locale
.TE
.SH CONFORMING TO
POSIX.1-2001, POSIX.1-2008.
.SH NOTES
The behavior of
.BR iswblank ()
depends on the
.B LC_CTYPE
category of the
current locale.
.SH SEE ALSO
.BR isblank (3),
.BR iswctype (3)
.SH COLOPHON
This page is part of release 5.04 of the Linux
.I man-pages
project.
A description of the project,
information about reporting bugs,
and the latest version of this page,
can be found at
\%https://www.kernel.org/doc/man\-pages/.