45cab335bc
This is the first step toward isolating standard C and POSIX headers into a single replaceable header file. Change-Id: I527297f5e7260b01103018ad3429922962ee9add Signed-off-by: Daniel Verkamp <daniel.verkamp@intel.com>
135 lines
4.5 KiB
C
135 lines
4.5 KiB
C
/*-
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* BSD LICENSE
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*
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* Copyright (c) Intel Corporation.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Intel Corporation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/** \file
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* Bit array data structure
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*/
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#ifndef SPDK_BIT_ARRAY_H
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#define SPDK_BIT_ARRAY_H
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#include "spdk/stdinc.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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* Variable-length bit array.
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*/
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struct spdk_bit_array;
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/**
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* Return the number of bits a bit array is currently sized to hold.
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*/
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uint32_t spdk_bit_array_capacity(const struct spdk_bit_array *ba);
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/**
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* Create a bit array.
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*/
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struct spdk_bit_array *spdk_bit_array_create(uint32_t num_bits);
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/**
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* Free a bit array and set the pointer to NULL.
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*/
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void spdk_bit_array_free(struct spdk_bit_array **bap);
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/**
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* Create or resize a bit array.
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*
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* To create a new bit array, pass a pointer to a spdk_bit_array pointer that is NULL for bap.
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*
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* The bit array will be sized to hold at least num_bits.
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*
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* If num_bits is smaller than the previous size of the bit array,
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* any data beyond the new num_bits size will be cleared.
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*
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* If num_bits is larger than the previous size of the bit array,
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* any data beyond the old num_bits size will be cleared.
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*/
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int spdk_bit_array_resize(struct spdk_bit_array **bap, uint32_t num_bits);
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/**
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* Get the value of a bit from the bit array.
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*
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* If bit_index is beyond the end of the current size of the bit array,
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* this function will return false (i.e. bits beyond the end of the array are implicitly 0).
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*/
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bool spdk_bit_array_get(const struct spdk_bit_array *ba, uint32_t bit_index);
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/**
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* Set (to 1) a bit in the bit array.
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*
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* If bit_index is beyond the end of the bit array, this function will return -EINVAL.
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* On success, returns 0.
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*/
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int spdk_bit_array_set(struct spdk_bit_array *ba, uint32_t bit_index);
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/**
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* Clear (to 0) a bit in the bit array.
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*
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* If bit_index is beyond the end of the bit array, no action is taken. Bits beyond the end of the
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* bit array are implicitly 0.
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*/
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void spdk_bit_array_clear(struct spdk_bit_array *ba, uint32_t bit_index);
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/**
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* Find the index of the first set bit in the array.
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*
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* \param ba The bit array to search.
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* \param start_bit_index The bit index from which to start searching (0 to start from the beginning
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* of the array).
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*
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* \return The index of the first set bit. If no bits are set, returns UINT32_MAX.
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*/
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uint32_t spdk_bit_array_find_first_set(const struct spdk_bit_array *ba, uint32_t start_bit_index);
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/**
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* Find the index of the first cleared bit in the array.
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*
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* \param ba The bit array to search.
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* \param start_bit_index The bit index from which to start searching (0 to start from the beginning
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* of the array)..
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*
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* \return The index of the first cleared bit. Bits beyond the current size of the array are
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* implicitly cleared, so if all bits within the current size are set, this function will return
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* the current number of bits + 1.
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*/
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uint32_t spdk_bit_array_find_first_clear(const struct spdk_bit_array *ba, uint32_t start_bit_index);
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#ifdef __cplusplus
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}
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#endif
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#endif
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