72 lines
2.6 KiB
C
72 lines
2.6 KiB
C
/*
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* Copyright (C) 2008 The Android Open Source Project
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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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* * 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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*
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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
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#pragma once
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/**
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* @file sys/param.h
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* @brief Various macros.
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*/
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#include <endian.h>
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#include <limits.h>
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#include <linux/param.h>
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#include <sys/cdefs.h>
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/** The unit of `st_blocks` in `struct stat`. */
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#define DEV_BSIZE 512
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/** A historical name for PATH_MAX. */
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#define MAXPATHLEN PATH_MAX
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#define MAXSYMLINKS 8
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#ifndef howmany
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#define howmany(x, y) (((x)+((y)-1))/(y))
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#endif
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#define roundup(x, y) ((((x)+((y)-1))/(y))*(y))
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/**
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* Returns true if the binary representation of the argument is all zeros
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* or has exactly one bit set. Contrary to the macro name, this macro
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* DOES NOT determine if the provided value is a power of 2. In particular,
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* this function falsely returns true for powerof2(0) and some negative
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* numbers.
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*/
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#define powerof2(x) \
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({ \
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__typeof__(x) _x = (x); \
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__typeof__(x) _x2; \
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__builtin_add_overflow(_x, -1, &_x2) ? 1 : ((_x2 & _x) == 0); \
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})
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/** Returns the lesser of its two arguments. */
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#define MIN(a,b) (((a)<(b))?(a):(b))
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/** Returns the greater of its two arguments. */
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#define MAX(a,b) (((a)>(b))?(a):(b))
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