WCWIDTH(3P)                                         POSIX Programmer's Manual                                        WCWIDTH(3P)



PROLOG
       This  manual  page is part of the POSIX Programmer's Manual.  The Linux implementation of this interface may differ (con-
       sult 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 posi-
       tions 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 IEEE Std 1003.1-2001, <wchar.h>

COPYRIGHT
       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003  Edition,  Standard  for
       Information  Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copy-
       right (C) 2001-2003 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.open-
       group.org/unix/online.html .



IEEE/The Open Group                                           2003                                                   WCWIDTH(3P)