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94 lines
2.5 KiB
C
94 lines
2.5 KiB
C
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/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or http://www.opensolaris.org/os/licensing.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright 2006 Sun Microsystems, Inc. All rights reserved.
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* Use is subject to license terms.
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*/
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/* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
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/* All Rights Reserved */
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#ifndef _SYS_BITMAP_H
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#define _SYS_BITMAP_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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/*
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* Operations on bitmaps of arbitrary size
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* A bitmap is a vector of 1 or more ulong_t's.
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* The user of the package is responsible for range checks and keeping
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* track of sizes.
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*/
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#ifdef _LP64
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#define BT_ULSHIFT 6 /* log base 2 of BT_NBIPUL, to extract word index */
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#define BT_ULSHIFT32 5 /* log base 2 of BT_NBIPUL, to extract word index */
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#else
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#define BT_ULSHIFT 5 /* log base 2 of BT_NBIPUL, to extract word index */
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#endif
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#define BT_NBIPUL (1 << BT_ULSHIFT) /* n bits per ulong_t */
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#define BT_ULMASK (BT_NBIPUL - 1) /* to extract bit index */
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/*
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* bitmap is a ulong_t *, bitindex an index_t
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*
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* The macros BT_WIM and BT_BIW internal; there is no need
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* for users of this package to use them.
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*/
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/*
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* word in map
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*/
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#define BT_WIM(bitmap, bitindex) \
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((bitmap)[(bitindex) >> BT_ULSHIFT])
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/*
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* bit in word
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*/
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#define BT_BIW(bitindex) \
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(1UL << ((bitindex) & BT_ULMASK))
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/*
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* These are public macros
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*
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* BT_BITOUL == n bits to n ulong_t's
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*/
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#define BT_BITOUL(nbits) \
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(((nbits) + BT_NBIPUL - 1l) / BT_NBIPUL)
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#define BT_SIZEOFMAP(nbits) \
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(BT_BITOUL(nbits) * sizeof (ulong_t))
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#define BT_TEST(bitmap, bitindex) \
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((BT_WIM((bitmap), (bitindex)) & BT_BIW(bitindex)) ? 1 : 0)
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#define BT_SET(bitmap, bitindex) \
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{ BT_WIM((bitmap), (bitindex)) |= BT_BIW(bitindex); }
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#define BT_CLEAR(bitmap, bitindex) \
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{ BT_WIM((bitmap), (bitindex)) &= ~BT_BIW(bitindex); }
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#ifdef __cplusplus
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}
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#endif
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#endif /* _SYS_BITMAP_H */
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