ISWCNTRL
Section: POSIX Programmer's Manual (3P)
Updated: 2017
Page Index
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This manual page is part of the POSIX Programmer's Manual.
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NAME
iswcntrl,
iswcntrl_l
--- test for a control wide-character code
SYNOPSIS
#include <wctype.h>
int iswcntrl(wint_t wc);
int iswcntrl_l(wint_t wc, locale_t locale);
DESCRIPTION
For
iswcntrl():
The functionality described on this reference page is aligned with the
ISO C standard. Any conflict between the requirements described here and the
ISO C standard is unintentional. This volume of POSIX.1-2017 defers to the ISO C standard.
The
iswcntrl()
and
iswcntrl_l()
functions shall test whether
wc
is a wide-character code representing a character of class
cntrl
in the current locale,
or in the locale represented by
locale,
respectively; see the Base Definitions volume of POSIX.1-2017,
Chapter 7, Locale.
The
wc
argument is a
wint_t,
the value of which the application shall ensure is a wide-character
code corresponding to a valid character in the locale used by the
function, or equal to the value of the macro WEOF. If the argument
has any other value, the behavior is undefined.
The behavior is undefined if the
locale
argument to
iswcntrl_l()
is the special locale object LC_GLOBAL_LOCALE or is not a valid locale
object handle.
RETURN VALUE
The
iswcntrl()
and
iswcntrl_l()
functions shall return non-zero if
wc
is a control wide-character code; otherwise, they shall return 0.
ERRORS
No errors are defined.
The following sections are informative.
EXAMPLES
None.
APPLICATION USAGE
To ensure applications portability, especially across natural
languages, only these functions and the functions in the reference pages
listed in the SEE ALSO section should be used for character classification.
RATIONALE
None.
FUTURE DIRECTIONS
None.
SEE ALSO
iswalnum(),
iswalpha(),
iswctype(),
iswdigit(),
iswgraph(),
iswlower(),
iswprint(),
iswpunct(),
iswspace(),
iswupper(),
iswxdigit(),
setlocale(),
uselocale()
The Base Definitions volume of POSIX.1-2017,
Chapter 7, Locale,
<locale.h>,
<wctype.h>
COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1-2017, Standard for Information Technology
-- Portable Operating System Interface (POSIX), The Open Group Base
Specifications Issue 7, 2018 Edition,
Copyright (C) 2018 by the Institute of
Electrical and Electronics Engineers, Inc and The Open Group.
In the event of any discrepancy between this version and the original IEEE and
The Open Group Standard, the original IEEE and The Open Group Standard
is the referee document. The original Standard can be obtained online at
http://www.opengroup.org/unix/online.html .
Any typographical or formatting errors that appear
in this page are most likely
to have been introduced during the conversion of the source files to
man page format. To report such errors, see
https://www.kernel.org/doc/man-pages/reporting_bugs.html .