| 1 | /*- |
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| 2 | * Copyright (c) 2008, Jeffrey Roberson <jeff@freebsd.org> |
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| 3 | * All rights reserved. |
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| 4 | * |
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| 5 | * Copyright (c) 2008 Nokia Corporation |
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| 6 | * All rights reserved. |
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| 7 | * |
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| 8 | * Redistribution and use in source and binary forms, with or without |
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| 9 | * modification, are permitted provided that the following conditions |
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| 10 | * are met: |
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| 11 | * 1. Redistributions of source code must retain the above copyright |
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| 12 | * notice unmodified, this list of conditions, and the following |
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| 13 | * disclaimer. |
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| 14 | * 2. Redistributions in binary form must reproduce the above copyright |
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| 15 | * notice, this list of conditions and the following disclaimer in the |
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| 16 | * documentation and/or other materials provided with the distribution. |
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| 17 | * |
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| 18 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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| 19 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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| 20 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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| 21 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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| 22 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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| 23 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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| 24 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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| 25 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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| 26 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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| 27 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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| 28 | * |
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| 29 | * $FreeBSD: head/sys/sys/_bitset.h 299184 2016-05-06 16:41:23Z royger $ |
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| 30 | */ |
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| 31 | |
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| 32 | #ifndef _SYS__BITSET_H_ |
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| 33 | #define _SYS__BITSET_H_ |
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| 34 | |
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| 35 | /* |
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| 36 | * Macros addressing word and bit within it, tuned to make compiler |
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| 37 | * optimize cases when SETSIZE fits into single machine word. |
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| 38 | */ |
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| 39 | #define _BITSET_BITS (sizeof(long) * 8) |
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| 40 | |
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| 41 | #define __howmany(x, y) (((x) + ((y) - 1)) / (y)) |
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| 42 | |
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| 43 | #define __bitset_words(_s) (__howmany(_s, _BITSET_BITS)) |
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| 44 | |
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| 45 | #define BITSET_DEFINE(t, _s) \ |
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| 46 | struct t { \ |
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| 47 | long __bits[__bitset_words((_s))]; \ |
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| 48 | } |
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| 49 | |
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| 50 | /* |
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| 51 | * Helper to declare a bitset without it's size being a constant. |
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| 52 | * |
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| 53 | * Sadly we cannot declare a bitset struct with '__bits[]', because it's |
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| 54 | * the only member of the struct and the compiler complains. |
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| 55 | */ |
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| 56 | #define BITSET_DEFINE_VAR(t) BITSET_DEFINE(t, 1) |
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| 57 | |
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| 58 | #endif /* !_SYS__BITSET_H_ */ |
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