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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. | |
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 | <http://www.gnu.org/licenses/>. */ | |
18 | ||
19 | /* adapted for Quagga from glibc patch submission originally from | |
20 | * Florian Weimer <fweimer@redhat.com>, 2016-05-18 */ | |
21 | ||
22 | #include <string.h> | |
23 | ||
24 | #include "config.h" | |
25 | ||
26 | #ifndef HAVE_STRLCPY | |
27 | #undef strlcpy | |
28 | ||
29 | size_t | |
30 | strlcpy (char *__restrict dest, const char *__restrict src, size_t size); | |
31 | ||
32 | size_t | |
33 | strlcpy (char *__restrict dest, const char *__restrict src, size_t size) | |
34 | { | |
35 | size_t src_length = strlen (src); | |
36 | ||
37 | if (__builtin_expect (src_length >= size, 0)) | |
38 | { | |
39 | if (size > 0) | |
40 | { | |
41 | /* Copy the leading portion of the string. The last | |
42 | character is subsequently overwritten with the NUL | |
43 | terminator, but the destination size is usually a | |
44 | multiple of a small power of two, so writing it twice | |
45 | should be more efficient than copying an odd number of | |
46 | bytes. */ | |
47 | memcpy (dest, src, size); | |
48 | dest[size - 1] = '\0'; | |
49 | } | |
50 | } | |
51 | else | |
52 | /* Copy the string and its terminating NUL character. */ | |
53 | memcpy (dest, src, src_length + 1); | |
54 | return src_length; | |
55 | } | |
56 | #endif /* HAVE_STRLCPY */ |