trusty (3) wcwidth.3posix.gz

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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 IEEE Std 1003.1-2001, <wchar.h>


       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, Copyright (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.opengroup.org/unix/online.html .