mirror of
git://sourceware.org/git/lvm2.git
synced 2024-12-22 17:35:59 +03:00
8ef2b021ed
Clear many compiler warnings (i386) & associated bugs - hopefully without introducing too many new bugs:-) (Same exercise required for other archs.) Default compilation has optimisation - or else use ./configure --enable-debug
78 lines
1.3 KiB
C
78 lines
1.3 KiB
C
/*
|
|
* Copyright (C) 2001 Sistina Software (UK) Limited.
|
|
*
|
|
* This file is released under the LGPL.
|
|
*/
|
|
|
|
#include "lib.h"
|
|
#include "bitset.h"
|
|
|
|
/* FIXME: calculate this. */
|
|
#define INT_SHIFT 5
|
|
|
|
bitset_t bitset_create(struct pool *mem, unsigned num_bits)
|
|
{
|
|
unsigned n = (num_bits / BITS_PER_INT) + 2;
|
|
size_t size = sizeof(int) * n;
|
|
unsigned *bs = pool_zalloc(mem, size);
|
|
|
|
if (!bs)
|
|
return NULL;
|
|
|
|
*bs = num_bits;
|
|
return bs;
|
|
}
|
|
|
|
void bitset_destroy(bitset_t bs)
|
|
{
|
|
dbg_free(bs);
|
|
}
|
|
|
|
void bit_union(bitset_t out, bitset_t in1, bitset_t in2)
|
|
{
|
|
int i;
|
|
for (i = (in1[0] / BITS_PER_INT) + 1; i; i--)
|
|
out[i] = in1[i] | in2[i];
|
|
}
|
|
|
|
/*
|
|
* FIXME: slow
|
|
*/
|
|
static inline int _test_word(uint32_t test, int bit)
|
|
{
|
|
while (bit < BITS_PER_INT) {
|
|
if (test & (0x1 << bit))
|
|
return bit;
|
|
bit++;
|
|
}
|
|
|
|
return -1;
|
|
}
|
|
|
|
int bit_get_next(bitset_t bs, int last_bit)
|
|
{
|
|
int bit, word;
|
|
uint32_t test;
|
|
|
|
last_bit++; /* otherwise we'll return the same bit again */
|
|
|
|
while (last_bit < bs[0]) {
|
|
word = last_bit >> INT_SHIFT;
|
|
test = bs[word + 1];
|
|
bit = last_bit & (BITS_PER_INT - 1);
|
|
|
|
if ((bit = _test_word(test, bit)) >= 0)
|
|
return (word * BITS_PER_INT) + bit;
|
|
|
|
last_bit = last_bit - (last_bit & (BITS_PER_INT - 1)) +
|
|
BITS_PER_INT;
|
|
}
|
|
|
|
return -1;
|
|
}
|
|
|
|
int bit_get_first(bitset_t bs)
|
|
{
|
|
return bit_get_next(bs, -1);
|
|
}
|