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

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

SYNOPSIS

       #include <wchar.h>

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

DESCRIPTION

       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.

RETURN VALUE

       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).

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

       wcwidth()

       The Base Definitions volume of POSIX.1‐2017, Section 3.103, Column Position, <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 .