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d4697bc9 | 1 | /* Copyright (C) 1991-2014 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 PE |
15 | License along with the GNU C Library; if not, see |
16 | <http://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 * | |
24 | __strcat_chk (dest, src, destlen) | |
25 | char *dest; | |
26 | const char *src; | |
27 | size_t destlen; | |
28 | { | |
29 | char *s1 = dest; | |
30 | const char *s2 = src; | |
50f81fd7 | 31 | char c; |
b5cc329c UD |
32 | |
33 | /* Find the end of the string. */ | |
34 | do | |
35 | { | |
36 | if (__builtin_expect (destlen-- == 0, 0)) | |
37 | __chk_fail (); | |
38 | c = *s1++; | |
39 | } | |
40 | while (c != '\0'); | |
41 | ||
42 | /* Make S1 point before the next character, so we can increment | |
43 | it while memory is read (wins on pipelined cpus). */ | |
44 | ++destlen; | |
45 | s1 -= 2; | |
46 | ||
47 | do | |
48 | { | |
49 | if (__builtin_expect (destlen-- == 0, 0)) | |
50 | __chk_fail (); | |
51 | c = *s2++; | |
52 | *++s1 = c; | |
53 | } | |
54 | while (c != '\0'); | |
55 | ||
56 | return dest; | |
57 | } |