iswblank - test for whitespace wide character
SYNOPSIS
#include <wctype.h>
int iswblank (wint_t wc);
DESCRIPTION
The iswblank function is the wide-character equivalent of
the isblank function. It tests whether wc is a wide char
acter 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
This function is a GNU extension.
SEE ALSO
isblank(3), iswctype(3)
NOTES
The behaviour of iswblank depends on the LC_CTYPE category
of the current locale.
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