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 '\t'.

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.

SEE ALSO¶

isblank(3), iswctype(3)

COLOPHON¶

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