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c5d9d3bb | 1 | /* Copy a null-terminated string to a fixed-size buffer, with length checking. |
896014f4 DL |
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 | |
d62a17ae | 17 | * <http://www.gnu.org/licenses/>. |
896014f4 | 18 | */ |
c5d9d3bb DL |
19 | |
20 | /* adapted for Quagga from glibc patch submission originally from | |
21 | * Florian Weimer <fweimer@redhat.com>, 2016-05-18 */ | |
22 | ||
b45ac5f5 | 23 | #ifdef HAVE_CONFIG_H |
c5d9d3bb | 24 | #include "config.h" |
b45ac5f5 DL |
25 | #endif |
26 | ||
27 | #include <string.h> | |
c5d9d3bb DL |
28 | |
29 | #ifndef HAVE_STRLCPY | |
30 | #undef strlcpy | |
31 | ||
c9a164df DS |
32 | size_t strlcpy(char *__restrict dest, |
33 | const char *__restrict src, size_t destsize); | |
c5d9d3bb | 34 | |
c9a164df DS |
35 | size_t strlcpy(char *__restrict dest, |
36 | const char *__restrict src, size_t destsize) | |
c5d9d3bb | 37 | { |
d62a17ae | 38 | size_t src_length = strlen(src); |
c5d9d3bb | 39 | |
c9a164df DS |
40 | if (__builtin_expect(src_length >= destsize, 0)) { |
41 | if (destsize > 0) { | |
42 | /* | |
43 | * Copy the leading portion of the string. The last | |
44 | * character is subsequently overwritten with the NUL | |
45 | * terminator, but the destination destsize is usually | |
46 | * a multiple of a small power of two, so writing it | |
47 | * twice should be more efficient than copying an odd | |
48 | * number of bytes. | |
49 | */ | |
50 | memcpy(dest, src, destsize); | |
51 | dest[destsize - 1] = '\0'; | |
d62a17ae | 52 | } |
53 | } else | |
54 | /* Copy the string and its terminating NUL character. */ | |
55 | memcpy(dest, src, src_length + 1); | |
56 | return src_length; | |
c5d9d3bb DL |
57 | } |
58 | #endif /* HAVE_STRLCPY */ |