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457208b1e9
This patch rewrites wcsnlen using wmemchr. The generic wmemchr already uses the strategy (loop unrolling and tail handling) and by using it it allows architectures that have optimized wmemchr (s390 and x86_64) to optimize wcsnlen as well. Checked on x86_64-linux-gnu. * wcsmbs/wcsnlen.c (__wcsnlen): Rewrite using wmemchr.
37 lines
1.2 KiB
C
37 lines
1.2 KiB
C
/* Copyright (C) 1998-2019 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@cygnus.com>, 1998.
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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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<http://www.gnu.org/licenses/>. */
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#include <wchar.h>
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#ifdef WCSNLEN
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# define __wcsnlen WCSNLEN
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#endif
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/* Return length of string S at most maxlen. */
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size_t
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__wcsnlen (const wchar_t *s, size_t maxlen)
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{
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const wchar_t *ret = __wmemchr (s, L'\0', maxlen);
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if (ret)
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maxlen = ret - s;
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return maxlen;
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}
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#ifndef WCSNLEN
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weak_alias (__wcsnlen, wcsnlen)
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#endif
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