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 (consult the correspond-
       ing 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 cur-
       rent 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>

COPYRIGHT

       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2013 Edition, Standard for Information Technol-
       ogy  --	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 Stan-
       dard 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 .

IEEE
/The Open Group						       2013							       WCWIDTH(3P)