1 | /* rawmemchr - find a character in a memory zone |
2 | |
3 | Copyright (C) 2015-2022 Free Software Foundation, Inc. |
4 | |
5 | This file is part of the GNU C Library. |
6 | |
7 | The GNU C Library is free software; you can redistribute it and/or |
8 | modify it under the terms of the GNU Lesser General Public |
9 | License as published by the Free Software Foundation; either |
10 | version 2.1 of the License, or (at your option) any later version. |
11 | |
12 | The GNU C Library is distributed in the hope that it will be useful, |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
15 | Lesser General Public License for more details. |
16 | |
17 | You should have received a copy of the GNU Lesser General Public |
18 | License along with the GNU C Library. If not, see |
19 | <https://www.gnu.org/licenses/>. */ |
20 | |
21 | #include <sysdep.h> |
22 | |
23 | /* Special case rawmemchr (s, 0) as strlen, otherwise tailcall memchr. |
24 | Call strlen without setting up a full frame - it preserves x14/x15. |
25 | */ |
26 | |
27 | ENTRY (__rawmemchr) |
28 | cbz w1, L(do_strlen) |
29 | mov x2, -1 |
30 | b __memchr |
31 | |
32 | L(do_strlen): |
33 | mov x15, x30 |
34 | cfi_return_column (x15) |
35 | mov x14, x0 |
36 | bl __strlen |
37 | add x0, x14, x0 |
38 | ret x15 |
39 | |
40 | END (__rawmemchr) |
41 | weak_alias (__rawmemchr, rawmemchr) |
42 | libc_hidden_builtin_def (__rawmemchr) |
43 | |