1/* Copyright (C) 1995-2022 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 <stddef.h>
19#include <wchar.h>
20
21
22/* Copy SRC to DEST. */
23wchar_t *
24__wcscpy_chk (wchar_t *dest, const wchar_t *src, size_t n)
25{
26 wint_t c;
27 wchar_t *wcp;
28
29 if (__alignof__ (wchar_t) >= sizeof (wchar_t))
30 {
31 const ptrdiff_t off = dest - src - 1;
32
33 wcp = (wchar_t *) src;
34
35 do
36 {
37 if (__glibc_unlikely (n-- == 0))
38 __chk_fail ();
39 c = *wcp++;
40 wcp[off] = c;
41 }
42 while (c != L'\0');
43 }
44 else
45 {
46 wcp = dest;
47
48 do
49 {
50 if (__glibc_unlikely (n-- == 0))
51 __chk_fail ();
52 c = *src++;
53 *wcp++ = c;
54 }
55 while (c != L'\0');
56 }
57
58 return dest;
59}
60

source code of glibc/debug/wcscpy_chk.c