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 .