iswcntrl - test for control wide character
int iswcntrl(wint_t wc);
The iswcntrl() function is the wide-character equivalent of the
iscntrl(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",
For an unsigned char c, iscntrl(c) implies
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
For an explanation of the terms used in this section, see attributes(7).
POSIX.1-2001, POSIX.1-2008, C99.
The behavior of iswcntrl() depends on the LC_CTYPE category of the
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