| xf.li | bdd93d5 | 2023-05-12 07:10:14 -0700 | [diff] [blame] | 1 | /* Copyright (C) 1996-2016 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 | |
| 25 | wchar_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 | } |
| 63 | libc_hidden_def (__wmemchr) |
| 64 | weak_alias (__wmemchr, wmemchr) |
| 65 | libc_hidden_weak (wmemchr) |