external/gpl2/lvm2/dist/libdm/datastruct/bitset.h

   1 /*      $NetBSD$        */
   2
   3 /*
   4  * Copyright (C) 2001-2004 Sistina Software, Inc. All rights reserved.
   5  * Copyright (C) 2004-2007 Red Hat, Inc. All rights reserved.
   6  *
   7  * This file is part of the device-mapper userspace tools.
   8  *
   9  * This copyrighted material is made available to anyone wishing to use,
  10  * modify, copy, or redistribute it subject to the terms and conditions
  11  * of the GNU Lesser General Public License v.2.1.
  12  *
  13  * You should have received a copy of the GNU Lesser General Public License
  14  * along with this program; if not, write to the Free Software Foundation,
  15  * Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  16  */
  17
  18 #ifndef _DM_BITSET_H
  19 #define _DM_BITSET_H
  20
  21 #include "pool.h"
  22
  23 #include <limits.h>
  24
  25 typedef uint32_t *bitset_t;
  26
  27 bitset_t bitset_create(struct pool *mem, unsigned num_bits);
  28 void bitset_destroy(bitset_t bs);
  29
  30 void bit_union(bitset_t out, bitset_t in1, bitset_t in2);
  31 int bit_get_first(bitset_t bs);
  32 int bit_get_next(bitset_t bs, int last_bit);
  33
  34 #define BITS_PER_INT (sizeof(int) * CHAR_BIT)
  35
  36 #define bit(bs, i) \
  37    (bs[(i / BITS_PER_INT) + 1] & (0x1 << (i & (BITS_PER_INT - 1))))
  38
  39 #define bit_set(bs, i) \
  40    (bs[(i / BITS_PER_INT) + 1] |= (0x1 << (i & (BITS_PER_INT - 1))))
  41
  42 #define bit_clear(bs, i) \
  43    (bs[(i / BITS_PER_INT) + 1] &= ~(0x1 << (i & (BITS_PER_INT - 1))))
  44
  45 #define bit_set_all(bs) \
  46    memset(bs + 1, -1, ((*bs / BITS_PER_INT) + 1) * sizeof(int))
  47
  48 #define bit_clear_all(bs) \
  49    memset(bs + 1, 0, ((*bs / BITS_PER_INT) + 1) * sizeof(int))
  50
  51 #define bit_copy(bs1, bs2) \
  52    memcpy(bs1 + 1, bs2 + 1, ((*bs1 / BITS_PER_INT) + 1) * sizeof(int))
  53
  54 #endif