iswcntrl man page

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(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", "punct".

For an unsigned char c, iscntrl(c) implies iswcntrl(btowc(c)), but not vice versa.

Return Value

The iswcntrl() function returns nonzero if wc is a wide character belonging to the wide-character class "cntrl". Otherwise, it returns zero.


For an explanation of the terms used in this section, see attributes(7).

Interface Attribute Value
iswcntrl() Thread safety MT-Safe locale

Conforming to

POSIX.1-2001, POSIX.1-2008, C99.


The behavior of iswcntrl() depends on the LC_CTYPE category of the current locale.

See Also

iscntrl(3), iswctype(3)


This page is part of release 4.09 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at

Referenced By

isalpha(3), iswctype(3).

2015-08-08 GNU Linux Programmer's Manual