ISWBLANK
Section: Linux Programmer's Manual (3)
Updated: 2019-03-06
Page Index
NAME
iswblank - test for whitespace wide character
SYNOPSIS
#include <wctype.h>
int iswblank(wint_t wc);
Feature Test Macro Requirements for glibc (see
feature_test_macros(7)):
iswblank():
-
_ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
DESCRIPTION
The
iswblank()
function is the wide-character equivalent of the
isblank(3)
function.
It tests whether
wc is a wide character
belonging to the wide-character class "blank".
The wide-character class "blank" is a subclass of the wide-character class
"space".
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".
The wide-character class "blank" always contains
at least the space character
and the control character '\t'.
RETURN VALUE
The
iswblank()
function returns nonzero
if
wc is a wide character
belonging to the wide-character class "blank".
Otherwise, it returns zero.
ATTRIBUTES
For an explanation of the terms used in this section, see
attributes(7).
| Interface | Attribute | Value
|
|
iswblank()
| Thread safety | MT-Safe locale
|
CONFORMING TO
POSIX.1-2001, POSIX.1-2008.
NOTES
The behavior of
iswblank()
depends on the
LC_CTYPE
category of the
current locale.
SEE ALSO
isblank(3),
iswctype(3)
COLOPHON
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man-pages
project.
A description of the project,
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and the latest version of this page,
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https://www.kernel.org/doc/man-pages/.