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git.proxmox.com Git - mirror_frr.git/blob - lib/strlcpy.c
1 /* Copy a null-terminated string to a fixed-size buffer, with length checking.
2 * Copyright (C) 2016 Free Software Foundation, Inc.
3 * This file is part of the GNU C Library.
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.
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.
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 * <http://www.gnu.org/licenses/>.
20 /* adapted for Quagga from glibc patch submission originally from
21 * Florian Weimer <fweimer@redhat.com>, 2016-05-18 */
30 size_t strlcpy(char *__restrict dest
, const char *__restrict src
, size_t size
);
32 size_t strlcpy(char *__restrict dest
, const char *__restrict src
, size_t size
)
34 size_t src_length
= strlen(src
);
36 if (__builtin_expect(src_length
>= size
, 0)) {
38 /* Copy the leading portion of the string. The last
39 character is subsequently overwritten with the NUL
40 terminator, but the destination size is usually a
41 multiple of a small power of two, so writing it twice
42 should be more efficient than copying an odd number
45 memcpy(dest
, src
, size
);
46 dest
[size
- 1] = '\0';
49 /* Copy the string and its terminating NUL character. */
50 memcpy(dest
, src
, src_length
+ 1);
53 #endif /* HAVE_STRLCPY */