redhat man page for iswcntrl

ISWCNTRL(3)						     Linux Programmer's Manual						       ISWCNTRL(3)

NAME
       iswcntrl - test for control wide character

SYNOPSIS
       #include <wctype.h>

       int iswcntrl(wint_t wc);

DESCRIPTION
       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.

RETURN VALUE
       The iswcntrl function returns non-zero if wc is a wide character belonging to the wide character class "cntrl". Otherwise it returns zero.

CONFORMING TO
       ISO/ANSI C, UNIX98

SEE ALSO
       iscntrl(3), iswctype(3)

NOTES
       The behaviour of iswcntrl depends on the LC_CTYPE category of the current locale.

GNU
								    1999-07-25							       ISWCNTRL(3)