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dff8da6b | 1 | /* Copyright (C) 1995-2024 Free Software Foundation, Inc. |
8215c9ec | 2 | This file is part of the GNU C Library. |
8215c9ec UD |
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/>. */ |
8215c9ec UD |
17 | |
18 | #include <wchar.h> | |
19 | ||
20 | ||
21 | /* Append SRC on the end of DEST. Check for overflows. */ | |
22 | wchar_t * | |
23 | __wcscat_chk (wchar_t *dest, const wchar_t *src, size_t destlen) | |
24 | { | |
2e09a79a JM |
25 | wchar_t *s1 = dest; |
26 | const wchar_t *s2 = src; | |
8215c9ec UD |
27 | wchar_t c; |
28 | ||
29 | /* Find the end of the string. */ | |
30 | do | |
31 | { | |
a1ffb40e | 32 | if (__glibc_unlikely (destlen-- == 0)) |
8215c9ec UD |
33 | __chk_fail (); |
34 | c = *s1++; | |
35 | } | |
36 | while (c != L'\0'); | |
37 | ||
38 | /* Make S1 point before the next character, so we can increment | |
39 | it while memory is read (wins on pipelined cpus). */ | |
40 | s1 -= 2; | |
41 | ++destlen; | |
42 | ||
43 | do | |
44 | { | |
a1ffb40e | 45 | if (__glibc_unlikely (destlen-- == 0)) |
8215c9ec UD |
46 | __chk_fail (); |
47 | c = *s2++; | |
48 | *++s1 = c; | |
49 | } | |
50 | while (c != L'\0'); | |
51 | ||
52 | return dest; | |
53 | } |