lvm2/unit-tests/datastruct/bitset_t.c

#include "libdevmapper.h"

#include <assert.h>

enum {
        NR_BITS = 137
};

static void test_get_next(struct dm_pool *mem)
{
        int i, j, last, first;
        dm_bitset_t bs = dm_bitset_create(mem, NR_BITS);

        for (i = 0; i < NR_BITS; i++)
                assert(!dm_bit(bs, i));

        for (i = 0, j = 1; i < NR_BITS; i += j, j++)
                dm_bit_set(bs, i);

        first = 1;
        for (i = 0, j = 1; i < NR_BITS; i += j, j++) {
                if (first) {
                        last = dm_bit_get_first(bs);
                        first = 0;
                } else
                        last = dm_bit_get_next(bs, last);

                assert(last == i);
        }

        assert(dm_bit_get_next(bs, last) == -1);
}

static void bit_flip(dm_bitset_t bs, int bit)
{
        int old = dm_bit(bs, bit);
        if (old)
                dm_bit_clear(bs, bit);
        else
                dm_bit_set(bs, bit);
}

static void test_equal(struct dm_pool *mem)
{
        dm_bitset_t bs1 = dm_bitset_create(mem, NR_BITS);
        dm_bitset_t bs2 = dm_bitset_create(mem, NR_BITS);

        int i, j;
        for (i = 0, j = 1; i < NR_BITS; i += j, j++) {
                dm_bit_set(bs1, i);
                dm_bit_set(bs2, i);
        }

        assert(dm_bitset_equal(bs1, bs2));
        assert(dm_bitset_equal(bs2, bs1));

        for (i = 0; i < NR_BITS; i++) {
                bit_flip(bs1, i);
                assert(!dm_bitset_equal(bs1, bs2));
                assert(!dm_bitset_equal(bs2, bs1));

                assert(dm_bitset_equal(bs1, bs1)); /* comparing with self */
                bit_flip(bs1, i);
        }
}

static void test_and(struct dm_pool *mem)
{
        dm_bitset_t bs1 = dm_bitset_create(mem, NR_BITS);
        dm_bitset_t bs2 = dm_bitset_create(mem, NR_BITS);
        dm_bitset_t bs3 = dm_bitset_create(mem, NR_BITS);

        int i, j;
        for (i = 0, j = 1; i < NR_BITS; i += j, j++) {
                dm_bit_set(bs1, i);
                dm_bit_set(bs2, i);
        }

        dm_bit_and(bs3, bs1, bs2);

        assert(dm_bitset_equal(bs1, bs2));
        assert(dm_bitset_equal(bs1, bs3));
        assert(dm_bitset_equal(bs2, bs3));

        dm_bit_clear_all(bs1);
        dm_bit_clear_all(bs2);

        for (i = 0; i < NR_BITS; i++) {
                if (i % 2)
                        dm_bit_set(bs1, i);
                else
                        dm_bit_set(bs2, i);
        }

        dm_bit_and(bs3, bs1, bs2);
        for (i = 0; i < NR_BITS; i++)
                assert(!dm_bit(bs3, i));
}

int main(int argc, char **argv)
{
        typedef void (*test_fn)(struct dm_pool *);
        static test_fn tests[] = {
                test_get_next,
                test_equal,
                test_and
        };

        int i;
        for (i = 0; i < sizeof(tests) / sizeof(*tests); i++) {
                struct dm_pool *mem = dm_pool_create("bitset test", 1024);
                assert(mem);
                tests[i](mem);
                dm_pool_destroy(mem);
        }

        return 0;
}