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 .