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authorcvs2svn <admin@example.com>2025-04-14 17:32:06 +0000
committercvs2svn <admin@example.com>2025-04-14 17:32:06 +0000
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1.\" $OpenBSD: wcslen.3,v 1.4 2024/07/14 09:51:18 jca Exp $
2.\"
3.\" Copyright (c) 1990, 1991 The Regents of the University of California.
4.\" All rights reserved.
5.\"
6.\" This code is derived from software contributed to Berkeley by
7.\" Chris Torek and the American National Standards Committee X3,
8.\" on Information Processing Systems.
9.\"
10.\" Redistribution and use in source and binary forms, with or without
11.\" modification, are permitted provided that the following conditions
12.\" are met:
13.\" 1. Redistributions of source code must retain the above copyright
14.\" notice, this list of conditions and the following disclaimer.
15.\" 2. Redistributions in binary form must reproduce the above copyright
16.\" notice, this list of conditions and the following disclaimer in the
17.\" documentation and/or other materials provided with the distribution.
18.\" 3. Neither the name of the University nor the names of its contributors
19.\" may be used to endorse or promote products derived from this software
20.\" without specific prior written permission.
21.\"
22.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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29.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32.\" SUCH DAMAGE.
33.\"
34.Dd $Mdocdate: July 14 2024 $
35.Dt WCSLEN 3
36.Os
37.Sh NAME
38.Nm wcslen ,
39.Nm wcsnlen
40.Nd find length of a wide string
41.Sh SYNOPSIS
42.In wchar.h
43.Ft size_t
44.Fn wcslen "const wchar_t *s"
45.Ft size_t
46.Fn wcsnlen "const wchar_t *s" "size_t maxlen"
47.Sh DESCRIPTION
48The
49.Fn wcslen
50function computes the length of the wide string
51.Fa s .
52The
53.Fn wcsnlen
54function computes the length of the wide string
55.Fa s ,
56up to
57.Fa maxlen
58wide characters.
59The
60.Fn wcsnlen
61function will never attempt to address more than
62.Fa maxlen
63wide characters, making it suitable for use with wide character arrays
64that are not guaranteed to be NUL-terminated.
65.Sh RETURN VALUES
66The
67.Fn wcslen
68function returns the number of wide characters that precede the terminating
69null wide character.
70.Pp
71The
72.Fn wcsnlen
73function returns the number of wide characters that precede the terminating
74null wide character
75or
76.Fa maxlen ,
77whichever is smaller.
78.Sh SEE ALSO
79.Xr strlen 3 ,
80.Xr wcswidth 3
81.Sh STANDARDS
82The
83.Fn wcslen
84function conforms to
85.St -isoC-99
86and was first introduced in
87.St -isoC-amd1 .
88The
89.Fn wcsnlen
90function conforms to
91.St -p1003.1-2008 .
92.Sh HISTORY
93The
94.Fn wcslen
95function was ported from
96.Nx
97and first appeared in
98.Ox 3.8 .
99The
100.Fn wcsnlen
101function first appeared in
102.Ox 7.6 .