mirror of https://github.com/mkerrisk/man-pages
99 lines
2.0 KiB
Groff
99 lines
2.0 KiB
Groff
.\" 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
|
|
.\"
|
|
.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>
|
|
.PP
|
|
.BI "size_t wcsnlen(const wchar_t *" s ", size_t " maxlen );
|
|
.fi
|
|
.PP
|
|
.in -4n
|
|
Feature Test Macro Requirements for glibc (see
|
|
.BR feature_test_macros (7)):
|
|
.in
|
|
.PP
|
|
.BR wcsnlen ():
|
|
.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 ()
|
|
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\\0\(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 .
|
|
.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 VERSIONS
|
|
The
|
|
.BR wcsnlen ()
|
|
function is provided in glibc since version 2.1.
|
|
.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)
|