1/* Copyright (C) 1996-2017 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Ulrich Drepper <drepper@gnu.org>, 1996.
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 <http://www.gnu.org/licenses/>. */
18
19#include <wchar.h>
20
21#ifdef WMEMCHR
22# define __wmemchr WMEMCHR
23#endif
24
25wchar_t *
26__wmemchr (const wchar_t *s, wchar_t c, size_t n)
27{
28 /* For performance reasons unfold the loop four times. */
29 while (n >= 4)
30 {
31 if (s[0] == c)
32 return (wchar_t *) s;
33 if (s[1] == c)
34 return (wchar_t *) &s[1];
35 if (s[2] == c)
36 return (wchar_t *) &s[2];
37 if (s[3] == c)
38 return (wchar_t *) &s[3];
39 s += 4;
40 n -= 4;
41 }
42
43 if (n > 0)
44 {
45 if (*s == c)
46 return (wchar_t *) s;
47 ++s;
48 --n;
49 }
50 if (n > 0)
51 {
52 if (*s == c)
53 return (wchar_t *) s;
54 ++s;
55 --n;
56 }
57 if (n > 0)
58 if (*s == c)
59 return (wchar_t *) s;
60
61 return NULL;
62}
63libc_hidden_def (__wmemchr)
64weak_alias (__wmemchr, wmemchr)
65libc_hidden_weak (wmemchr)
66