iswblank - test for whitespace wide character
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'.
The iswblank() function returns nonzero if
wc is a wide character belonging to the wide-character class "blank". Otherwise, it returns zero.
The behavior of iswblank() depends on the LC_CTYPE category of the current locale.
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