iswcntrl - test for control wide character
int iswcntrl (wint_t wc);
The iswcntrl function is the wide-character equivalent of the iscntrl
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 non-zero if wc is a wide character
belonging to the wide character class "cntrl". Otherwise it returns
ISO/ANSI C, UNIX98
The behaviour of iswcntrl depends on the LC_CTYPE category of the current
GNU 1999-07-25 ISWCNTRL(3)
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