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 corresponding
Linux manual page for details of Linux behavior), or the interface may
not be implemented on Linux.
NAMEwcwidth - 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 occu‐
pied by the wide-character code wc, or return -1 (if wc does not corre‐
spond 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 ALSOwcswidth(), 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, 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 .
IEEE/The Open Group 2003 WCWIDTH(3P)
