1/* Multiple versions of strlen. AARCH64 version.
2 Copyright (C) 2018-2022 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
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
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
18
19/* Define multiple versions only for the definition in libc. */
20
21#if IS_IN (libc)
22/* Redefine strlen so that the compiler won't complain about the type
23 mismatch with the IFUNC selector in strong_alias, below. */
24# undef strlen
25# define strlen __redirect_strlen
26# include <string.h>
27# include <init-arch.h>
28
29extern __typeof (__redirect_strlen) __strlen;
30
31extern __typeof (__redirect_strlen) __strlen_mte attribute_hidden;
32extern __typeof (__redirect_strlen) __strlen_asimd attribute_hidden;
33
34libc_ifunc (__strlen, (mte ? __strlen_mte : __strlen_asimd));
35
36# undef strlen
37strong_alias (__strlen, strlen);
38#endif
39

source code of glibc/sysdeps/aarch64/multiarch/strlen.c