iswcntrl(3) -- Linux man page
NAMEiswcntrl - test for control wide character
#include <wctype.h> int iswcntrl(wint_t wc);
DESCRIPTIONThe 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".
RETURN VALUEThe iswcntrl function returns non-zero if wc is a wide character belonging to the wide character class "cntrl". Otherwise it returns zero.
CONFORMING TOISO/ANSI C, UNIX98
SEE ALSOiscntrl(3), iswctype(3)
NOTESThe behaviour of iswcntrl depends on the LC_CTYPE category of the current locale.