focal (3) wcwidth.3posix.gz

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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.1‐2008, <wchar.h>


       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 Electrical 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.kernel.org/doc/man-pages/reporting_bugs.html .