This manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface

       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.

       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                                      WCSWIDTH(3POSIX)

       The  wcswidth()  function  shall  determine  the number of column positions required for n wide-character
       codes (or fewer than n wide-character codes if a null wide-character code is encountered before  n  wide-
       character codes are exhausted) in the string pointed to by pwcs.

       No errors are defined.

       Thefollowingsectionsareinformative.

       None.

       None.

       wcswidth — number of column positions of a wide-character string

       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.

       None.

       The  wcswidth()  function either shall return 0 (if pwcs points to a null wide-character code), or return
       the number of column positions to be occupied by the wide-character string pointed to by pwcs, or  return
       -1  (if  any of the first n wide-character codes in the wide-character string pointed to by pwcs is not a
       printable wide-character code).

wcwidth()

       The Base Definitions volume of POSIX.1‐2017, Section3.103, ColumnPosition, <wchar.h>

       #include <wchar.h>

       int wcswidth(const wchar_t *pwcs, size_t n);