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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 occu-
       pied by the wide-character code wc, or return -1 (if wc does not corre-
       spond 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.1-2008, <wchar.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 Electri-
       cal  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.ker-
       nel.org/doc/man-pages/reporting_bugs.html .
IEEE/The Open Group                  2013                          WCWIDTH(3P)