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+'\" t
+.\" Copyright (c) Bruno Haible <haible@clisp.cons.org>
+.\"
+.\" SPDX-License-Identifier: GPL-2.0-or-later
+.\"
+.\" References consulted:
+.\"   GNU glibc-2 source code and manual
+.\"   Dinkumware C library reference http://www.dinkumware.com/
+.\"   OpenGroup's Single UNIX specification http://www.UNIX-systems.org/online.html
+.\"
+.TH wcsnlen 3 2024-05-02 "Linux man-pages (unreleased)"
+.SH NAME
+wcsnlen \- determine the length of a fixed-size wide-character string
+.SH LIBRARY
+Standard C library
+.RI ( libc ", " \-lc )
+.SH SYNOPSIS
+.nf
+.B #include <wchar.h>
+.P
+.BI "size_t wcsnlen(const wchar_t " s [. maxlen "], size_t " maxlen );
+.fi
+.P
+.RS -4
+Feature Test Macro Requirements for glibc (see
+.BR feature_test_macros (7)):
+.RE
+.P
+.BR wcsnlen ():
+.nf
+    Since glibc 2.10:
+        _POSIX_C_SOURCE >= 200809L
+    Before glibc 2.10:
+        _GNU_SOURCE
+.fi
+.SH DESCRIPTION
+The
+.BR wcsnlen ()
+function is the wide-character equivalent
+of the
+.BR strnlen (3)
+function.
+It returns the number of wide-characters in the string pointed to by
+.IR s ,
+not including the terminating null wide character (L\[aq]\e0\[aq]),
+but at most
+.I maxlen
+wide characters (note: this parameter is not a byte count).
+In doing this,
+.BR wcsnlen ()
+looks at only the first
+.I maxlen
+wide characters at
+.I s
+and never beyond
+.IR s[maxlen\-1] .
+.SH RETURN VALUE
+The
+.BR wcsnlen ()
+function returns
+.IR wcslen(s) ,
+if that is less than
+.IR maxlen ,
+or
+.I maxlen
+if there is no null wide character among the
+first
+.I maxlen
+wide characters pointed to by
+.IR s .
+.SH ATTRIBUTES
+For an explanation of the terms used in this section, see
+.BR attributes (7).
+.TS
+allbox;
+lbx lb lb
+l l l.
+Interface	Attribute	Value
+T{
+.na
+.nh
+.BR wcsnlen ()
+T}	Thread safety	MT-Safe
+.TE
+.SH STANDARDS
+POSIX.1-2008.
+.SH HISTORY
+glibc 2.1.
+.SH SEE ALSO
+.BR strnlen (3),
+.BR wcslen (3)