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/*
* Copyright (C) 2010-2011, Parallels, Inc. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef _BITMAP_H_
#define _BITMAP_H_
#include <stdlib.h>
#include <string.h>
#ifndef DIV_ROUND_UP
#define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d))
#endif
#ifndef MIN
#define MIN(a, b) ((a) < (b) ? (a) : (b))
#endif
#ifndef MAX
#define MAX(a, b) ((a) > (b) ? (a) : (b))
#endif
#define BITS_PER_BYTE 8
#define BITS_PER_LONG (BITS_PER_BYTE * sizeof(long))
#define BITS_TO_LONGS(nr) DIV_ROUND_UP(nr, BITS_PER_LONG)
#define BIT_MASK(nr) (1UL << ((nr) % BITS_PER_LONG))
#define BIT_WORD(nr) ((nr) / BITS_PER_LONG)
static inline unsigned long *alloc_bitmap(int nmaskbits)
{
return malloc(BITS_TO_LONGS(nmaskbits) * sizeof(long));
}
static inline void bitmap_zero(unsigned long *maskp, int nmaskbits)
{
memset(maskp, 0, BITS_TO_LONGS(nmaskbits) * sizeof(long));
}
static inline void bitmap_set_all(unsigned long *maskp, int nmaskbits)
{
memset(maskp, -1, BITS_TO_LONGS(nmaskbits) * sizeof(long));
}
static inline int bitmap_test_bit(int nr, const unsigned long *maskp)
{
return (maskp[BIT_WORD(nr)] & BIT_MASK(nr)) != 0;
}
static inline void bitmap_set_bit(int nr, unsigned long *maskp)
{
maskp[BIT_WORD(nr)] |= BIT_MASK(nr);
}
static inline void bitmap_clear_bit(int nr, unsigned long *maskp)
{
maskp[BIT_WORD(nr)] &= ~BIT_MASK(nr);
}
int bitmap_find_first_zero_bit(const unsigned long *maskp, int nmaskbits);
int bitmap_parse(const char *str, unsigned long *maskp, int nmaskbits);
int bitmap_snprintf(char *buf, unsigned int buflen,
const unsigned long *maskp, int nmaskbits);
#endif /* _BITMAP_H_ */
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