1/* Fortified version of strlcat.
2 Copyright (C) 2023 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
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 <string.h>
20
21/* Check that the user-supplied size does not exceed the
22 compiler-determined size, and then forward to strlcat. */
23size_t
24__strlcat_chk (char *__restrict s1, const char *__restrict s2,
25 size_t n, size_t s1len)
26{
27 if (__glibc_unlikely (s1len < n))
28 __chk_fail ();
29
30 return __strlcat (s1, s2, n);
31}
32