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ISWCNTRL(3) Linux Programmer's Manual ISWCNTRL(3)
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",
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
The behaviour of iswcntrl depends on the LC_CTYPE category of the current locale.
GNU 1999-07-25 ISWCNTRL(3)
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