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Fix search_node, add cintcmp

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This commit is contained in:
Howard Chu 2011-09-06 15:22:53 -07:00
parent 5e6a864513
commit f9c8796d0b
1 changed files with 28 additions and 11 deletions
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39
libraries/libmdb/mdb.c
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@ -539,7 +539,7 @@ static size_t mdb_branch_size(MDB_env *env, MDB_val *key);
static void mdb_default_cmp(MDB_txn *txn, MDB_dbi dbi);
static MDB_cmp_func memncmp, memnrcmp, intcmp;
static MDB_cmp_func memncmp, memnrcmp, intcmp, cintcmp;
#ifdef _WIN32
static SECURITY_DESCRIPTOR mdb_null_sd;
@ -1937,6 +1937,7 @@ mdb_env_close(MDB_env *env)
free(env);
}
/* only for aligned ints */
static int
intcmp(const MDB_val *a, const MDB_val *b)
{
@ -1954,6 +1955,26 @@ intcmp(const MDB_val *a, const MDB_val *b)
}
}
/* ints must always be the same size */
static int
cintcmp(const MDB_val *a, const MDB_val *b)
{
#if __BYTE_ORDER == __LITTLE_ENDIAN
unsigned char *u, *c;
int x;
u = a->mv_data + a->mv_size;
c = b->mv_data + a->mv_size;
while(u > (unsigned char *)a->mv_data) {
x = *--u - *--c;
if (x) break;
}
return x;
#else
return memcmp(a->mv_data, b->mv_data, a->mv_size);
#endif
}
static int
memncmp(const MDB_val *a, const MDB_val *b)
{
@ -2065,6 +2086,8 @@ mdb_search_node(MDB_txn *txn, MDB_dbi dbi, MDB_page *mp, MDB_val *key,
if (rc > 0) { /* Found entry is less than the key. */
i++; /* Skip to get the smallest entry larger than key. */
if (!IS_LEAF2(mp))
node = NODEPTR(mp, i);
}
if (exactp)
*exactp = (rc == 0);
@ -4337,12 +4360,10 @@ mdb_env_stat(MDB_env *env, MDB_stat *arg)
static void
mdb_default_cmp(MDB_txn *txn, MDB_dbi dbi)
{
if (txn->mt_dbs[dbi].md_flags & (MDB_REVERSEKEY
#if __BYTE_ORDER == __LITTLE_ENDIAN
|MDB_INTEGERKEY
#endif
))
if (txn->mt_dbs[dbi].md_flags & MDB_REVERSEKEY)
txn->mt_dbxs[dbi].md_cmp = memnrcmp;
else if (txn->mt_dbs[dbi].md_flags & MDB_INTEGERKEY)
txn->mt_dbxs[dbi].md_cmp = cintcmp;
else
txn->mt_dbxs[dbi].md_cmp = memncmp;
@ -4351,11 +4372,7 @@ mdb_default_cmp(MDB_txn *txn, MDB_dbi dbi)
if (txn->mt_dbs[dbi].md_flags & MDB_DUPFIXED)
txn->mt_dbxs[dbi].md_dcmp = intcmp;
else
#if __BYTE_ORDER == __LITTLE_ENDIAN
txn->mt_dbxs[dbi].md_dcmp = memnrcmp;
#else
txn->mt_dbxs[dbi].md_dcmp = memncmp;
#endif
txn->mt_dbxs[dbi].md_dcmp = cintcmp;
} else if (txn->mt_dbs[dbi].md_flags & MDB_REVERSEDUP) {
txn->mt_dbxs[dbi].md_dcmp = memnrcmp;
} else {