.\" Copyright (c) Bruno Haible <haible@clisp.cons.org>
.\"
+.\" %%%LICENSE_START(GPLv2+_DOC_ONEPARA)
.\" This is free documentation; you can redistribute it and/or
.\" modify it under the terms of the GNU General Public License as
.\" published by the Free Software Foundation; either version 2 of
.\" the License, or (at your option) any later version.
+.\" %%%LICENSE_END
.\"
.\" 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
+.\" OpenGroup's Single UNIX specification http://www.UNIX-systems.org/online.html
.\"
-.TH WCSNLEN 3 2010-09-15 "GNU" "Linux Programmer's Manual"
+.TH WCSNLEN 3 2016-03-15 "GNU" "Linux Programmer's Manual"
.SH NAME
wcsnlen \- determine the length of a fixed-size wide-character string
.SH SYNOPSIS
.nf
.B #include <wchar.h>
-.sp
+.PP
.BI "size_t wcsnlen(const wchar_t *" s ", size_t " maxlen );
.fi
-.sp
+.PP
.in -4n
Feature Test Macro Requirements for glibc (see
.BR feature_test_macros (7)):
.in
-.sp
+.PP
.BR wcsnlen ():
-.br
-Since glibc 2.10: _POSIX_C_SOURCE\ >=\ 200809L || _XOPEN_SOURCE\ >=\ 700
-.br
+.PD 0
+.ad l
+.RS 4
+.TP 4
+Since glibc 2.10:
+_POSIX_C_SOURCE\ >=\ 200809L
+.TP
Before glibc 2.10:
_GNU_SOURCE
+.RE
+.ad
+.PD
.SH DESCRIPTION
The
.BR wcsnlen ()
.BR strnlen (3)
function.
It returns the number of wide-characters in the string pointed to by
-\fIs\fP, not including the terminating L\(aq\\0\(aq character, but at most
-\fImaxlen\fP.
+.IR s ,
+not including the terminating null wide character (L\(aq\\0\(aq),
+but at most
+.I maxlen
+wide characters (note: this parameter is not a byte count).
In doing this,
.BR wcsnlen ()
-looks only at the first \fImaxlen\fP
-wide-characters at \fIs\fP and never beyond \fIs+maxlen\fP.
-.SH "RETURN VALUE"
+looks at only the first
+.I maxlen
+wide characters at
+.I s
+and never beyond
+.IR s+maxlen .
+.SH RETURN VALUE
The
.BR wcsnlen ()
-function returns \fIwcslen(s)\fP, if that is less than
-\fImaxlen\fP, or \fImaxlen\fP if there is no L\(aq\\0\(aq character among the
-first \fImaxlen\fP wide characters pointed to by \fIs\fP.
+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 VERSIONS
The
.BR wcsnlen ()
function is provided in glibc since version 2.1.
-.SH "CONFORMING TO"
-This function is a GNU extension.
-.SH "SEE ALSO"
+.SH ATTRIBUTES
+For an explanation of the terms used in this section, see
+.BR attributes (7).
+.TS
+allbox;
+lb lb lb
+l l l.
+Interface Attribute Value
+T{
+.BR wcsnlen ()
+T} Thread safety MT-Safe
+.TE
+.SH CONFORMING TO
+POSIX.1-2008.
+.SH SEE ALSO
.BR strnlen (3),
.BR wcslen (3)