| /* Copyright (C) 1996-2018 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| Contributed by Ulrich Drepper <drepper@gnu.org>, 1996. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C Library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library; if not, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #include <wchar.h> |
| |
| #ifdef WMEMCHR |
| # define __wmemchr WMEMCHR |
| #endif |
| |
| wchar_t * |
| __wmemchr (const wchar_t *s, wchar_t c, size_t n) |
| { |
| /* For performance reasons unfold the loop four times. */ |
| while (n >= 4) |
| { |
| if (s[0] == c) |
| return (wchar_t *) s; |
| if (s[1] == c) |
| return (wchar_t *) &s[1]; |
| if (s[2] == c) |
| return (wchar_t *) &s[2]; |
| if (s[3] == c) |
| return (wchar_t *) &s[3]; |
| s += 4; |
| n -= 4; |
| } |
| |
| if (n > 0) |
| { |
| if (*s == c) |
| return (wchar_t *) s; |
| ++s; |
| --n; |
| } |
| if (n > 0) |
| { |
| if (*s == c) |
| return (wchar_t *) s; |
| ++s; |
| --n; |
| } |
| if (n > 0) |
| if (*s == c) |
| return (wchar_t *) s; |
| |
| return NULL; |
| } |
| libc_hidden_def (__wmemchr) |
| weak_alias (__wmemchr, wmemchr) |
| libc_hidden_weak (wmemchr) |
