iswcntrl

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



PROLOG
       This manual page is part of the POSIX Programmer's Manual.  The Linux
       implementation of this interface may differ (consult the corresponding
       Linux manual page for details of Linux behavior), or the interface may
       not be implemented on Linux.


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.1‐2008 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.1‐2008, 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
       current locale, 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.1‐2008, Chapter 7, Locale,
       <locale.h>, <wctype.h>

COPYRIGHT
       Portions of this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
       -- Portable Operating System Interface (POSIX), The Open Group Base
       Specifications Issue 7, Copyright (C) 2013 by the Institute of Electrical
       and Electronics Engineers, Inc and The Open Group.  (This is POSIX.1-2008
       with the 2013 Technical Corrigendum 1 applied.) 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.unix.org/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 .



IEEE/The Open Group                   2013                      ISWCNTRL(3POSIX)