WCSLEN
Section: POSIX Programmer's Manual (3P)
Updated: 2017
Page Index
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.
NAME
wcslen, wcsnlen
--- get length of a fixed-sized wide-character string
SYNOPSIS
#include <wchar.h>
size_t wcslen(const wchar_t *ws);
size_t wcsnlen(const wchar_t *ws, size_t maxlen);
DESCRIPTION
For
wcslen():
The functionality described on this reference page is aligned with the
ISO C standard. Any conflict between the requirements described here and the
ISO C standard is unintentional. This volume of POSIX.1-2017 defers to the ISO C standard.
The
wcslen()
function shall compute the number of wide-character codes in the
wide-character string to which
ws
points, not including the terminating null wide-character code.
The
wcsnlen()
function shall compute the smaller of the number of wide characters in
the array to which
ws
points, not including any terminating null wide-character code, and the
value of
maxlen.
The
wcsnlen()
function shall never examine more than the first
maxlen
characters of the wide-character array pointed to by
ws.
RETURN VALUE
The
wcslen()
function shall return the length of
ws.
The
wcsnlen()
function shall return the number of wide characters preceding the
first null wide-character code in the array to which
ws
points, if
ws
contains a null wide-character code within the first
maxlen
wide characters; otherwise, it shall return
maxlen.
No return values are reserved to indicate an error.
ERRORS
No errors are defined.
The following sections are informative.
EXAMPLES
None.
APPLICATION USAGE
None.
RATIONALE
None.
FUTURE DIRECTIONS
None.
SEE ALSO
strlen()
The Base Definitions volume of POSIX.1-2017,
<wchar.h>
COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1-2017, Standard for Information Technology
-- Portable Operating System Interface (POSIX), The Open Group Base
Specifications Issue 7, 2018 Edition,
Copyright (C) 2018 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 .
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 .