ISWBLANK

Section: Linux Programmer's Manual (3)
Updated: 2007-07-26
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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; 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 non-zero if wc is a wide character belonging to the wide-character class "blank". Otherwise it returns zero.

CONFORMING TO

POSIX.1-2001.

NOTES

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

COLOPHON

This page is part of release 3.22 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.