iswcntrl - test for control wide character
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
iswcntrl(btowc(c)), but not vice versa.
The iswcntrl() function returns nonzero if
wc is a wide character belonging to the wide-character class "cntrl". Otherwise, it returns zero.
POSIX.1-2001, POSIX.1-2008, C99.
The behavior of iswcntrl() depends on the LC_CTYPE category of the current locale.
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