65 lines
1.5 KiB
C
65 lines
1.5 KiB
C
/* Copyright (C) 1996-2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <wchar.h>
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#ifdef WMEMCHR
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# define __wmemchr WMEMCHR
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#endif
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wchar_t *
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__wmemchr (const wchar_t *s, wchar_t c, size_t n)
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{
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/* For performance reasons unfold the loop four times. */
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while (n >= 4)
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{
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if (s[0] == c)
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return (wchar_t *) s;
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if (s[1] == c)
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return (wchar_t *) &s[1];
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if (s[2] == c)
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return (wchar_t *) &s[2];
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if (s[3] == c)
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return (wchar_t *) &s[3];
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s += 4;
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n -= 4;
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}
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if (n > 0)
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{
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if (*s == c)
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return (wchar_t *) s;
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++s;
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--n;
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}
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if (n > 0)
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{
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if (*s == c)
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return (wchar_t *) s;
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++s;
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--n;
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}
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if (n > 0)
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if (*s == c)
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return (wchar_t *) s;
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return NULL;
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}
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libc_hidden_def (__wmemchr)
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weak_alias (__wmemchr, wmemchr)
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libc_hidden_weak (wmemchr)
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