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.  */
26 wchar_t *
__wcpcpy_chk(wchar_t * dest,const wchar_t * src,size_t destlen)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