1/* Copyright (C) 1996-2022 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
8
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <https://www.gnu.org/licenses/>. */
17
18#include <wchar.h>
19
20#define __need_ptrdiff_t
21#include <stddef.h>
22
23
24/* Copy SRC to DEST, returning the address of the terminating L'\0' in
25 DEST. Check for overflows. */
26wchar_t *
27__wcpcpy_chk (wchar_t *dest, const wchar_t *src, size_t destlen)
28{
29 wchar_t *wcp = (wchar_t *) dest - 1;
30 wint_t c;
31 const ptrdiff_t off = src - dest + 1;
32
33 do
34 {
35 if (__glibc_unlikely (destlen-- == 0))
36 __chk_fail ();
37 c = wcp[off];
38 *++wcp = c;
39 }
40 while (c != L'\0');
41
42 return wcp;
43}
44