int iswcntrl(wint_t wc);
The iswcntrl() function is the wide-character equivalent of the iscn-
trl(3) function. It tests whether wc is a wide character belonging to
the wide-character class "cntrl".
The wide-character class "cntrl" is disjoint from the wide-character
class "print" and therefore also disjoint from its subclasses "graph",
"alpha", "upper", "lower", "digit", "xdigit", "punct".
For an unsigned char c, iscntrl(c) implies iswcntrl(btowc(c)), but not
The iswcntrl() function returns nonzero if wc is a wide character
belonging to the wide-character class "cntrl". Otherwise it returns
The behavior of iswcntrl() depends on the LC_CTYPE category of the cur-
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