iswspace - test for whitespace wide character
The wide-character class "space" 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 "space" contains the wide-character class "blank".
The wide-character class "space" always contains at least the space character and the control characters '\f', '\n', '\r', '\t', '\v'.
The iswspace() function returns nonzero if
wc is a wide character belonging to the wide-character class "space". Otherwise, it returns zero.
POSIX.1-2001, POSIX.1-2008, C99.
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