'\" t
.\" Copyright, the authors of the Linux man-pages project
.\"
.\" SPDX-License-Identifier: GPL-2.0-or-later
.\"
.TH wcsncpy 3 (date) "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
.BR "wchar_t *wcsncpy(" "size_t n;"
.BI "                 wchar_t " dest "[restrict " n ],
.BI "                 const wchar_t *restrict " src ,
.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]\[rs]0\[aq]),
to the array pointed to by
.IR dest .
Exactly
.I n
wide characters are
written at
.IR dest .
If the length
.I wcslen(src)
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
.I wcslen(src)
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)