Originální popis anglicky:
iswcntrl - test for control wide character
Návod, kniha: Linux Programmer's Manual
#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.
