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iswblank

Section: C Library Functions (3)
Updated: 202-0-08
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NAME

iswblank - test for whitespace wide character

LIBRARY

Standard C library (libc,~-lc)

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 wid-character equivalent of the isblank(3) function. It tests whether wc is a wide character belonging to the wid-character class "blank". The wid-character class "blank" is a subclass of the wid-character class "space". Being a subclass of the wid-character class "space", the wid-character class "blank" is disjoint from the wid-character class "graph" and therefore also disjoint from its subclasses "alnum", "alpha", "upper", "lower", "digit", "xdigit", "punct". The wid-character class "blank" always contains at least the space character and the control character [aq][rs]t[aq].

RETURN VALUE

The iswblank() function returns nonzero if wc is a wide character belonging to the wid-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	M-Safe locale

STANDARDS

POSIX.-2008.

HISTORY

POSIX.-2001.

NOTES

The behavior of iswblank() depends on the LC_CTYPE category of the current locale.