mirror of https://github.com/mkerrisk/man-pages
48 lines
1.5 KiB
Groff
48 lines
1.5 KiB
Groff
.\" Copyright (c) Bruno Haible <haible@clisp.cons.org>
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.\"
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.\" This is free documentation; you can redistribute it and/or
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.\" modify it under the terms of the GNU General Public License as
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.\" published by the Free Software Foundation; either version 2 of
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.\" the License, or (at your option) any later version.
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.\"
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.\" References consulted:
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.\" GNU glibc-2 source code and manual
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.\" Dinkumware C library reference http://www.dinkumware.com/
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.\" OpenGroup's Single Unix specification http://www.UNIX-systems.org/online.html
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.\"
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.TH WCSNLEN 3 2007-07-26 "GNU" "Linux Programmer's Manual"
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.SH NAME
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wcsnlen \- determine the length of a fixed-size wide-character string
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.SH SYNOPSIS
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.nf
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.B #define _GNU_SOURCE
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.B #include <wchar.h>
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.sp
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.BI "size_t wcsnlen(const wchar_t *" s ", size_t " maxlen );
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.fi
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.SH DESCRIPTION
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The
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.BR wcsnlen ()
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function is the wide-character equivalent
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of the
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.BR strnlen (3)
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function.
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It returns the number of wide-characters in the string pointed to by
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\fIs\fP, not including the terminating L\(aq\\0\(aq character, but at most
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\fImaxlen\fP.
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In doing this,
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.BR wcsnlen ()
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looks only at the first \fImaxlen\fP
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wide-characters at \fIs\fP and never beyond \fIs+maxlen\fP.
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.SH "RETURN VALUE"
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The
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.BR wcsnlen ()
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function returns \fIwcslen(s)\fP, if that is less than
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\fImaxlen\fP, or \fImaxlen\fP if there is no L\(aq\\0\(aq character among the
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first \fImaxlen\fP wide characters pointed to by \fIs\fP.
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.SH "CONFORMING TO"
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This function is a GNU extension.
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.SH "SEE ALSO"
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.BR strnlen (3),
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.BR wcslen (3)
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