Linux manual pages Section 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(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.

ATTRIBUTES

Multithreading (see pthreads(7))

The iswcntrl() function is thread-safe with exceptions. It can be safely used in multithreaded applications, as long as setlocale(3) is not called to change the locale during its execution.

CONFORMING TO

C99.

NOTES

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

SEE ALSO

iscntrl(3), iswctype(3)

COLOPHON

This page is part of release 3.72 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 http://www.kernel.org/doc/man−pages/.


  Copyright (c) Bruno Haible <haibleclisp.cons.org>

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References consulted:
  GNU glibc-2 source code and manual
  Dinkumware C library reference http://www.dinkumware.com/
  OpenGroup's Single UNIX specification http://www.UNIX-systems.org/online.html
  ISO/IEC 9899:1999