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d614a753 | 1 | /* Copyright (C) 1995-2020 Free Software Foundation, Inc. |
8215c9ec UD |
2 | This file is part of the GNU C Library. |
3 | Contributed by Ulrich Drepper <drepper@gnu.ai.mit.edu>, 1995. | |
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 | |
59ba27a6 | 16 | License along with the GNU C Library; if not, see |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
8215c9ec UD |
18 | |
19 | #include <wchar.h> | |
20 | ||
21 | ||
22 | /* Append SRC on the end of DEST. Check for overflows. */ | |
23 | wchar_t * | |
24 | __wcscat_chk (wchar_t *dest, const wchar_t *src, size_t destlen) | |
25 | { | |
2e09a79a JM |
26 | wchar_t *s1 = dest; |
27 | const wchar_t *s2 = src; | |
8215c9ec UD |
28 | wchar_t c; |
29 | ||
30 | /* Find the end of the string. */ | |
31 | do | |
32 | { | |
a1ffb40e | 33 | if (__glibc_unlikely (destlen-- == 0)) |
8215c9ec UD |
34 | __chk_fail (); |
35 | c = *s1++; | |
36 | } | |
37 | while (c != L'\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 | s1 -= 2; | |
42 | ++destlen; | |
43 | ||
44 | do | |
45 | { | |
a1ffb40e | 46 | if (__glibc_unlikely (destlen-- == 0)) |
8215c9ec UD |
47 | __chk_fail (); |
48 | c = *s2++; | |
49 | *++s1 = c; | |
50 | } | |
51 | while (c != L'\0'); | |
52 | ||
53 | return dest; | |
54 | } |