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
27ENTRY (__rawmemchr)
28	cbz	w1, L(do_strlen)
29	mov	x2, -1
30	b	__memchr
31
32L(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
40END (__rawmemchr)
41weak_alias (__rawmemchr, rawmemchr)
42libc_hidden_builtin_def (__rawmemchr)
43