Section: POSIX Programmer's Manual (3P)
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.
--- number of column positions of a wide-character code
int wcwidth(wchar_t wc);
function shall determine the number of column positions required for
the wide character
The application shall ensure that the value of
is a character representable as a
and is a wide-character code corresponding to a valid character in
the current locale.
function shall either return 0 (if
is a null wide-character code), or return the number of column
positions to be occupied by the wide-character code
or return -1 (if
does not correspond to a printable wide-character code).
No errors are defined.
The following sections are informative.
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.
The Base Definitions volume of POSIX.1-2008,
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
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