WCSWIDTH(3P) POSIX Programmer's Manual WCSWIDTH(3P)
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.
wcswidth -- number of column positions of a wide-character string
int wcswidth(const wchar_t *pwcs, size_t n);
The wcswidth() function shall determine the number of column positions required for n wide-character codes (or fewer than n wide-character
codes if a null wide-character code is encountered before n wide-character codes are exhausted) in the string pointed to by pwcs.
The wcswidth() function either shall return 0 (if pwcs points to a null wide-character code), or return the number of column positions to
be occupied by the wide-character string pointed to by pwcs, or return -1 (if any of the first n wide-character codes in the wide-character
string pointed to by pwcs is not 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
The Base Definitions volume of POSIX.1-2008, Section 3.103, Column Position, <wchar.h>
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 .
/The Open Group 2013 WCSWIDTH(3P)