67 lines
2.4 KiB
C
67 lines
2.4 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2008, Jeffrey Roberson <jeff@freebsd.org>
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* All rights reserved.
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*
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* Copyright (c) 2008 Nokia Corporation
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice unmodified, this list of conditions, and the following
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* disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD: head/sys/sys/_bitset.h 331723 2018-03-29 02:54:50Z jeff $
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*/
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#ifndef _SYS__BITSET_H_
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#define _SYS__BITSET_H_
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/*
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* Macros addressing word and bit within it, tuned to make compiler
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* optimize cases when SETSIZE fits into single machine word.
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*/
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#define _BITSET_BITS (sizeof(long) * 8)
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#define __howmany(x, y) (((x) + ((y) - 1)) / (y))
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#define __bitset_words(_s) (__howmany(_s, _BITSET_BITS))
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#define BITSET_DEFINE(t, _s) \
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struct t { \
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long __bits[__bitset_words((_s))]; \
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}
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/*
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* Helper to declare a bitset without it's size being a constant.
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*
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* Sadly we cannot declare a bitset struct with '__bits[]', because it's
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* the only member of the struct and the compiler complains.
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*/
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#define BITSET_DEFINE_VAR(t) BITSET_DEFINE(t, 1)
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/*
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* Define a default type that can be used while manually specifying size
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* to every call.
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*/
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BITSET_DEFINE(bitset, 1);
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#endif /* !_SYS__BITSET_H_ */
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