WCWIDTH(3P)                POSIX Programmer's Manual               WCWIDTH(3P)

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
       wcwidth -- number of column positions of a wide-character code

SYNOPSIS
       #include <wchar.h>

       int wcwidth(wchar_t wc);

DESCRIPTION
       The wcwidth() function shall determine the number of column positions
       required for the wide character wc.  The application shall ensure that
       the value of wc is a character representable as a wchar_t, and is a
       wide-character code corresponding to a valid character in the current
       locale.

RETURN VALUE
       The wcwidth() function shall either return 0 (if wc is a null wide-
       character code), or return the number of column positions to be
       occupied by the wide-character code wc, or return -1 (if wc does not
       correspond to a printable wide-character code).

ERRORS
       No errors are defined.

       The following sections are informative.

EXAMPLES
       None.

APPLICATION USAGE
       This function was removed from the final ISO/IEC 9899:1990/Amendment
       1:1995 (E), and the return value for a non-printable wide character is
       not specified.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       wcswidth()

       The Base Definitions volume of POSIX.1-2017, <wchar.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 .

IEEE/The Open Group                  2017                          WCWIDTH(3P)