b58a5d73ef
SPDK_COUNTOF works like sizeof, except it returns the number of elements in an array instead of the number of bytes. Change-Id: I38ff4dd3485ed9b630cc5660ff84851d0031911f Signed-off-by: Daniel Verkamp <daniel.verkamp@intel.com>
74 lines
2.2 KiB
C
74 lines
2.2 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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* General utility functions
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*/
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#ifndef SPDK_UTIL_H
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#define SPDK_UTIL_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <stddef.h>
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#include <stdint.h>
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#define spdk_min(a,b) (((a)<(b))?(a):(b))
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#define spdk_max(a,b) (((a)>(b))?(a):(b))
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#define SPDK_COUNTOF(arr) (sizeof(arr) / sizeof((arr)[0]))
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static inline uint32_t
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spdk_u32log2(uint32_t x)
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{
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if (x == 0) {
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/* log(0) is undefined */
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return 0;
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}
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return 31u - __builtin_clz(x);
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}
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static inline uint32_t
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spdk_align32pow2(uint32_t x)
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{
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return 1u << (1 + spdk_u32log2(x - 1));
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}
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#ifdef __cplusplus
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}
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#endif
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#endif
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