mirror of
git://sourceware.org/git/lvm2.git
synced 2024-12-22 17:35:59 +03:00
fcbef05aae
Hmm rpmlint suggest fsf is using a different address these days, so lets keep it up-to-date
106 lines
2.2 KiB
C
106 lines
2.2 KiB
C
/*
|
|
* Copyright (C) 2001-2004 Sistina Software, Inc. All rights reserved.
|
|
* Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
|
|
*
|
|
* This file is part of the device-mapper userspace tools.
|
|
*
|
|
* This copyrighted material is made available to anyone wishing to use,
|
|
* modify, copy, or redistribute it subject to the terms and conditions
|
|
* of the GNU Lesser General Public License v.2.1.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public License
|
|
* along with this program; if not, write to the Free Software Foundation,
|
|
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#include "dmlib.h"
|
|
|
|
/* FIXME: calculate this. */
|
|
#define INT_SHIFT 5
|
|
|
|
dm_bitset_t dm_bitset_create(struct dm_pool *mem, unsigned num_bits)
|
|
{
|
|
unsigned n = (num_bits / DM_BITS_PER_INT) + 2;
|
|
size_t size = sizeof(int) * n;
|
|
dm_bitset_t bs;
|
|
|
|
if (mem)
|
|
bs = dm_pool_zalloc(mem, size);
|
|
else
|
|
bs = dm_zalloc(size);
|
|
|
|
if (!bs)
|
|
return NULL;
|
|
|
|
*bs = num_bits;
|
|
|
|
return bs;
|
|
}
|
|
|
|
void dm_bitset_destroy(dm_bitset_t bs)
|
|
{
|
|
dm_free(bs);
|
|
}
|
|
|
|
int dm_bitset_equal(dm_bitset_t in1, dm_bitset_t in2)
|
|
{
|
|
int i;
|
|
|
|
for (i = (in1[0] / DM_BITS_PER_INT) + 1; i; i--)
|
|
if (in1[i] != in2[i])
|
|
return 0;
|
|
|
|
return 1;
|
|
}
|
|
|
|
void dm_bit_and(dm_bitset_t out, dm_bitset_t in1, dm_bitset_t in2)
|
|
{
|
|
int i;
|
|
|
|
for (i = (in1[0] / DM_BITS_PER_INT) + 1; i; i--)
|
|
out[i] = in1[i] & in2[i];
|
|
}
|
|
void dm_bit_union(dm_bitset_t out, dm_bitset_t in1, dm_bitset_t in2)
|
|
{
|
|
int i;
|
|
for (i = (in1[0] / DM_BITS_PER_INT) + 1; i; i--)
|
|
out[i] = in1[i] | in2[i];
|
|
}
|
|
|
|
static int _test_word(uint32_t test, int bit)
|
|
{
|
|
uint32_t tb = test >> bit;
|
|
|
|
return (tb ? ffs(tb) + bit - 1 : -1);
|
|
}
|
|
|
|
int dm_bit_get_next(dm_bitset_t bs, int last_bit)
|
|
{
|
|
int bit, word;
|
|
uint32_t test;
|
|
|
|
last_bit++; /* otherwise we'll return the same bit again */
|
|
|
|
/*
|
|
* bs[0] holds number of bits
|
|
*/
|
|
while (last_bit < (int) bs[0]) {
|
|
word = last_bit >> INT_SHIFT;
|
|
test = bs[word + 1];
|
|
bit = last_bit & (DM_BITS_PER_INT - 1);
|
|
|
|
if ((bit = _test_word(test, bit)) >= 0)
|
|
return (word * DM_BITS_PER_INT) + bit;
|
|
|
|
last_bit = last_bit - (last_bit & (DM_BITS_PER_INT - 1)) +
|
|
DM_BITS_PER_INT;
|
|
}
|
|
|
|
return -1;
|
|
}
|
|
|
|
int dm_bit_get_first(dm_bitset_t bs)
|
|
{
|
|
return dm_bit_get_next(bs, -1);
|
|
}
|