sortix--sortix/ext/util.h

/*
 * Copyright (c) 2013, 2015 Jonas 'Sortie' Termansen.
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 *
 * util.h
 * Utility functions for the filesystem implementation.
 */

#ifndef UTIL_H
#define UTIL_H

template <class T> T divup(T a, T b)
{
	return a/b + (a % b ? 1 : 0);
}

template <class T> T roundup(T a, T b)
{
	return a % b ? a + b - a % b : a;
}

static inline bool checkbit(const uint8_t* bitmap, size_t bit)
{
	uint8_t bits = bitmap[bit / 8UL];
	return bits & (1U << (bit % 8UL));
}

static inline void setbit(uint8_t* bitmap, size_t bit)
{
	bitmap[bit / 8UL] |= 1U << (bit % 8UL);
}

static inline void clearbit(uint8_t* bitmap, size_t bit)
{
	bitmap[bit / 8UL] &= ~(1U << (bit % 8UL));
}

#endif