69 lines
2.2 KiB
C
69 lines
2.2 KiB
C
/* Copyright 2016 IBM Corp.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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* implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef __BITMAP_H
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#define __BITMAP_H
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#include <stdint.h>
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#include <stdbool.h>
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typedef unsigned long bitmap_elem_t;
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typedef bitmap_elem_t bitmap_t[];
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#define BITMAP_ELSZ (sizeof(bitmap_elem_t) << 3)
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/* Number of elements for _n bits (rounded up) */
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#define BITMAP_ELEMS(_n) (((_n) + (BITMAP_ELSZ - 1)) / BITMAP_ELSZ)
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/* Number of bytes for _n bits (rounded up) */
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#define BITMAP_BYTES(_n) (BITMAP_ELEMS(_n) * sizeof(bitmap_elem_t))
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/* Bit number within an elemnt for bit _n */
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#define BITMAP_BIT(_n) ((_n) & (BITMAP_ELSZ - 1))
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/* Corresponding mask */
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#define BITMAP_MASK(_n) (1ul << BITMAP_BIT(_n))
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/* Element number for bit _n */
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#define BITMAP_ELEM(_n) ((_n) / BITMAP_ELSZ)
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static inline void bitmap_set_bit(bitmap_t map, unsigned int bit)
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{
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map[BITMAP_ELEM(bit)] |= BITMAP_MASK(bit);
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}
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static inline void bitmap_clr_bit(bitmap_t map, unsigned int bit)
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{
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map[BITMAP_ELEM(bit)] &= ~BITMAP_MASK(bit);
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}
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static inline bool bitmap_tst_bit(bitmap_t map, unsigned int bit)
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{
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return map[BITMAP_ELEM(bit)] & BITMAP_MASK(bit);
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}
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extern int bitmap_find_zero_bit(bitmap_t map, unsigned int start,
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unsigned int count);
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extern int bitmap_find_one_bit(bitmap_t map, unsigned int start,
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unsigned int count);
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#define bitmap_for_each_zero(map, size, bit) \
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for (bit = bitmap_find_zero_bit(map, 0, size); \
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bit >= 0; \
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bit = bitmap_find_zero_bit(map, (bit) + 1, (size) - (bit) - 1))
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#define bitmap_for_each_one(map, size, bit) \
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for (bit = bitmap_find_one_bit(map, 0, size); \
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bit >= 0; \
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bit = bitmap_find_one_bit(map, (bit) + 1, (size) - (bit) - 1))
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#endif /* __BITMAP_H */
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