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581c785b | 1 | /* Copyright (C) 1991-2022 Free Software Foundation, Inc. |
b5cc329c UD |
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 | |
59ba27a6 | 15 | License along with the GNU C Library; if not, see |
5a82c748 | 16 | <https://www.gnu.org/licenses/>. */ |
b5cc329c UD |
17 | |
18 | #include <string.h> | |
19 | #include <memcopy.h> | |
20 | ||
21 | ||
22 | /* Append SRC on the end of DEST. */ | |
23 | char * | |
9d46370c | 24 | __strcat_chk (char *dest, const char *src, size_t destlen) |
b5cc329c UD |
25 | { |
26 | char *s1 = dest; | |
27 | const char *s2 = src; | |
50f81fd7 | 28 | char c; |
b5cc329c UD |
29 | |
30 | /* Find the end of the string. */ | |
31 | do | |
32 | { | |
a1ffb40e | 33 | if (__glibc_unlikely (destlen-- == 0)) |
b5cc329c UD |
34 | __chk_fail (); |
35 | c = *s1++; | |
36 | } | |
37 | while (c != '\0'); | |
38 | ||
39 | /* Make S1 point before the next character, so we can increment | |
40 | it while memory is read (wins on pipelined cpus). */ | |
41 | ++destlen; | |
42 | s1 -= 2; | |
43 | ||
44 | do | |
45 | { | |
a1ffb40e | 46 | if (__glibc_unlikely (destlen-- == 0)) |
b5cc329c UD |
47 | __chk_fail (); |
48 | c = *s2++; | |
49 | *++s1 = c; | |
50 | } | |
51 | while (c != '\0'); | |
52 | ||
53 | return dest; | |
54 | } |