1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2008, Jeffrey Roberson <jeff@freebsd.org> 5 * All rights reserved. 6 * 7 * Copyright (c) 2008 Nokia Corporation 8 * All rights reserved. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice unmodified, this list of conditions, and the following 15 * disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 21 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 22 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 23 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 24 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 25 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 29 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 30 * 31 * $FreeBSD$ 32 */ 33 34 #ifndef _SYS__BITSET_H_ 35 #define _SYS__BITSET_H_ 36 37 /* 38 * Macros addressing word and bit within it, tuned to make compiler 39 * optimize cases when SETSIZE fits into single machine word. 40 */ 41 #define _BITSET_BITS (sizeof(long) * 8) 42 43 #define __howmany(x, y) (((x) + ((y) - 1)) / (y)) 44 45 #define __bitset_words(_s) (__howmany(_s, _BITSET_BITS)) 46 47 #define BITSET_DEFINE(t, _s) \ 48 struct t { \ 49 long __bits[__bitset_words((_s))]; \ 50 } 51 52 /* 53 * Helper to declare a bitset without it's size being a constant. 54 * 55 * Sadly we cannot declare a bitset struct with '__bits[]', because it's 56 * the only member of the struct and the compiler complains. 57 */ 58 #define BITSET_DEFINE_VAR(t) BITSET_DEFINE(t, 1) 59 60 /* 61 * Define a default type that can be used while manually specifying size 62 * to every call. 63 */ 64 BITSET_DEFINE(bitset, 1); 65 66 #endif /* !_SYS__BITSET_H_ */ 67