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mdbx: adds mdbx_get_ex() for libfpta.

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This commit is contained in:
Leo Yuriev 2017-01-19 17:11:30 +03:00
parent 5bb931f7c4
commit 688b711e31
2 changed files with 57 additions and 1 deletions
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53
mdbx.c
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@ -514,3 +514,56 @@ bailout:
txn->mt_cursors[dbi] = mc.mc_next;
return rc;
}
int
mdbx_get_ex(MDB_txn *txn, MDB_dbi dbi,
MDB_val *key, MDB_val *data, int* values_count)
{
DKBUF;
mdb_debug("===> get db %u key [%s]", dbi, DKEY(key));
if (unlikely(!key || !data || !txn))
return EINVAL;
if (unlikely(txn->mt_signature != MDBX_MT_SIGNATURE))
return MDB_VERSION_MISMATCH;
if (unlikely(!TXN_DBI_EXIST(txn, dbi, DB_USRVALID)))
return EINVAL;
if (unlikely(txn->mt_flags & MDB_TXN_BLOCKED))
return MDB_BAD_TXN;
MDB_cursor mc;
MDB_xcursor mx;
mdb_cursor_init(&mc, txn, dbi, &mx);
int exact = 0;
int rc = mdb_cursor_set(&mc, key, data, MDB_SET, &exact);
if (unlikely(rc != MDB_SUCCESS)) {
if (rc == MDB_NOTFOUND && values_count)
*values_count = 0;
return rc;
}
if (values_count) {
if (mc.mc_xcursor == NULL)
*values_count = 1;
else {
MDB_page *mp = mc.mc_pg[mc.mc_top];
if (IS_LEAF2(mp))
*values_count = 1;
else {
MDB_node *leaf = NODEPTR(mp, mc.mc_ki[mc.mc_top]);
if (!F_ISSET(leaf->mn_flags, F_DUPDATA))
*values_count = 1;
else {
mdb_tassert(txn, mc.mc_xcursor == &mx);
mdb_tassert(txn, mx.mx_cursor.mc_flags & C_INITIALIZED);
*values_count = mx.mx_db.md_entries;
}
}
}
}
return MDB_SUCCESS;
}

5
mdbx.h
View File

@ -219,12 +219,15 @@ typedef struct mdbx_canary {
int mdbx_canary_put(MDB_txn *txn, const mdbx_canary* canary);
size_t mdbx_canary_get(MDB_txn *txn, mdbx_canary* canary);
/** Returns 1 when no more data available or cursor not positioned,
/* Returns 1 when no more data available or cursor not positioned,
* 0 otherwise or less that zero in error case. */
int mdbx_cursor_eof(MDB_cursor *mc);
int mdbx_replace(MDB_txn *txn, MDB_dbi dbi,
MDB_val *key, MDB_val *new_data, MDB_val *old_data, unsigned flags);
/* Same as mdbx_get(), but also return the count
* of multi-values/duplicates for a given key. */
int mdbx_get_ex(MDB_txn *txn, MDB_dbi dbi, MDB_val *key, MDB_val *data, int* values_count);
/** @} */