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iswcntrl - test for control wide character
#include <wctype.h>
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 vice versa.
The iswcntrl function returns non-zero if
wc is a wide character belonging to the wide character class "cntrl". Otherwise
it returns zero.
ISO/ANSI C, UNIX98
iscntrl(3)
, iswctype(3)
The behaviour of iswcntrl depends on the LC_CTYPE category of the
current locale.
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