66 lines
1.7 KiB
C
66 lines
1.7 KiB
C
/*
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* Copyright(c) 2006 to 2021 ZettaScale Technology and others
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*
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* This program and the accompanying materials are made available under the
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* terms of the Eclipse Public License v. 2.0 which is available at
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* http://www.eclipse.org/legal/epl-2.0, or the Eclipse Distribution License
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* v. 1.0 which is available at
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* http://www.eclipse.org/org/documents/edl-v10.php.
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*
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* SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause
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*/
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#ifndef NN_BITSET_H
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#define NN_BITSET_H
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#include <assert.h>
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#include <stdint.h>
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#include <string.h>
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#include "dds/export.h"
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#include "dds/ddsi/q_unused.h"
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#if defined (__cplusplus)
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extern "C" {
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#endif
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DDS_INLINE_EXPORT inline int nn_bitset_isset (uint32_t numbits, const uint32_t *bits, uint32_t idx)
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{
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return idx < numbits && (bits[idx/32] & (UINT32_C(1) << (31 - (idx%32))));
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}
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DDS_INLINE_EXPORT inline void nn_bitset_set (UNUSED_ARG_NDEBUG (uint32_t numbits), uint32_t *bits, uint32_t idx)
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{
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assert (idx < numbits);
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bits[idx/32] |= UINT32_C(1) << (31 - (idx%32));
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}
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DDS_INLINE_EXPORT inline void nn_bitset_clear (UNUSED_ARG_NDEBUG (uint32_t numbits), uint32_t *bits, uint32_t idx)
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{
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assert (idx < numbits);
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bits[idx/32] &= ~(UINT32_C(1) << (31 - (idx%32)));
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}
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DDS_INLINE_EXPORT inline void nn_bitset_zero (uint32_t numbits, uint32_t *bits)
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{
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memset (bits, 0, 4 * ((numbits + 31) / 32));
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}
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DDS_INLINE_EXPORT inline void nn_bitset_one (uint32_t numbits, uint32_t *bits)
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{
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memset (bits, 0xff, 4 * ((numbits + 31) / 32));
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/* clear bits "accidentally" set */
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if ((numbits % 32) != 0)
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{
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const uint32_t k = numbits / 32;
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const uint32_t n = numbits % 32;
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bits[k] &= ~(~UINT32_C(0) >> n);
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}
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}
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#if defined (__cplusplus)
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}
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#endif
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#endif /* NN_BITSET_H */
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