63 lines
1.6 KiB
C
63 lines
1.6 KiB
C
/* Copyright (C) 1996, 1997 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@gnu.ai.mit.edu>, 1996.
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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 Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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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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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <wchar.h>
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wchar_t *
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wmemchr (s, c, n)
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register const wchar_t *s;
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register wchar_t c;
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register 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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