iswblank man page

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).

InterfaceAttributeValue
iswblank()Thread safetyMT-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

This page is part of release 4.08 of the Linux 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/.

Referenced By

isalpha(3), iswctype(3).

2016-03-15 GNU Linux Programmer's Manual