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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
.\" ISO/IEC 9899:1999
.\"
.TH wcsncpy 3 2024-05-02 "Linux man-pages (unreleased)"
.SH NAME
wcsncpy \- copy a fixed-size string of wide characters
.SH LIBRARY
Standard C library
.RI ( libc ", " \-lc )
.SH SYNOPSIS
.nf
.B #include <wchar.h>
.P
.BI "wchar_t *wcsncpy(wchar_t " dest "[restrict ." n ],
.BI " const wchar_t " src "[restrict ." n ],
.BI " size_t " n );
.fi
.SH DESCRIPTION
The
.BR wcsncpy ()
function is the wide-character equivalent of the
.BR strncpy (3)
function.
It copies at most
.I n
wide characters from the wide-character
string pointed to by
.IR src ,
including the terminating null wide character (L\[aq]\e0\[aq]),
to the array pointed to by
.IR dest .
Exactly
.I n
wide characters are
written at
.IR dest .
If the length \fIwcslen(src)\fP is smaller than
.IR n ,
the remaining wide characters in the array
pointed to by
.I dest
are filled
with null wide characters.
If the length \fIwcslen(src)\fP is greater than or equal
to
.IR n ,
the string pointed to by
.I dest
will not be terminated by a null wide character.
.P
The strings may not overlap.
.P
The programmer must ensure that there is room for at least
.I n
wide
characters at
.IR dest .
.SH RETURN VALUE
.BR wcsncpy ()
returns
.IR dest .
.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 wcsncpy ()
T} Thread safety MT-Safe
.TE
.SH STANDARDS
C11, POSIX.1-2008.
.SH HISTORY
POSIX.1-2001, C99.
.SH SEE ALSO
.BR strncpy (3)
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