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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():

_XOPEN_SOURCE >= 600 || _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L;
or cc -std=c99

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 aq\taq.

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

Multithreading (see pthreads(7) )

The iswblank() function is thread-safe with exceptions. It can be safely used in multithreaded applications, as long as setlocale(3) is not called to change the locale during its execution.

Conforming to

POSIX.1-2001.

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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