1/* Copyright (C) 1996-2020 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Ulrich Drepper <drepper@gnu.ai.mit.edu>, 1996.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
18
19#include <wchar.h>
20
21#define __need_ptrdiff_t
22#include <stddef.h>
23
24
25/* Copy SRC to DEST, returning the address of the terminating L'\0' in
26 DEST. Check for overflows. */
27wchar_t *
28__wcpcpy_chk (wchar_t *dest, const wchar_t *src, size_t destlen)
29{
30 wchar_t *wcp = (wchar_t *) dest - 1;
31 wint_t c;
32 const ptrdiff_t off = src - dest + 1;
33
34 do
35 {
36 if (__glibc_unlikely (destlen-- == 0))
37 __chk_fail ();
38 c = wcp[off];
39 *++wcp = c;
40 }
41 while (c != L'\0');
42
43 return wcp;
44}
45