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b168057a | 1 | /* Copyright (C) 1996-2015 Free Software Foundation, Inc. |
33a934a3 | 2 | This file is part of the GNU C Library. |
9b0b40d3 | 3 | Contributed by Ulrich Drepper <drepper@gnu.org>, 1996. |
30de3b18 | 4 | |
33a934a3 | 5 | The GNU C Library is free software; you can redistribute it and/or |
41bdb6e2 AJ |
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. | |
30de3b18 | 9 | |
33a934a3 UD |
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 | |
41bdb6e2 | 13 | Lesser General Public License for more details. |
30de3b18 | 14 | |
41bdb6e2 | 15 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 PE |
16 | License along with the GNU C Library; if not, see |
17 | <http://www.gnu.org/licenses/>. */ | |
30de3b18 RM |
18 | |
19 | #include <wchar.h> | |
20 | ||
21 | wchar_t * | |
22 | wmemchr (s, c, n) | |
2e09a79a JM |
23 | const wchar_t *s; |
24 | wchar_t c; | |
25 | size_t n; | |
30de3b18 RM |
26 | { |
27 | /* For performance reasons unfold the loop four times. */ | |
28 | while (n >= 4) | |
29 | { | |
30 | if (s[0] == c) | |
31 | return (wchar_t *) s; | |
32 | if (s[1] == c) | |
33 | return (wchar_t *) &s[1]; | |
34 | if (s[2] == c) | |
35 | return (wchar_t *) &s[2]; | |
36 | if (s[3] == c) | |
37 | return (wchar_t *) &s[3]; | |
38 | s += 4; | |
39 | n -= 4; | |
40 | } | |
41 | ||
42 | if (n > 0) | |
43 | { | |
44 | if (*s == c) | |
45 | return (wchar_t *) s; | |
46 | ++s; | |
47 | --n; | |
48 | } | |
49 | if (n > 0) | |
50 | { | |
51 | if (*s == c) | |
52 | return (wchar_t *) s; | |
53 | ++s; | |
54 | --n; | |
55 | } | |
56 | if (n > 0) | |
57 | if (*s == c) | |
58 | return (wchar_t *) s; | |
59 | ||
60 | return NULL; | |
61 | } | |
9b0b40d3 | 62 | libc_hidden_def (wmemchr) |