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ITS#7793 mdb_cursor_put(): Fix MDB_CURRENT.

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Ignore key, broken by 5bda3565a9
and some older code.  Document and clarify MDB_CURRENT usage.

Also affects non-MDB_CURRENT put() with empty data and a key
which matches by the mdb_set_compare function but not by memcmp.
This commit is contained in:
Hallvard Furuseth 2014-01-28 14:27:27 +01:00
parent aa3463ec7c
commit 4e954f8ae8
2 changed files with 15 additions and 6 deletions
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2
libraries/liblmdb/lmdb.h
View File

@ -1333,7 +1333,7 @@ int mdb_cursor_get(MDB_cursor *cursor, MDB_val *key, MDB_val *data,
* <ul>
* <li>#MDB_CURRENT - overwrite the data of the key/data pair to which
* the cursor refers with the specified data item. The \b key
* parameter is ignored.
* parameter is ignored. The \b data size must match the original.
* <li>#MDB_NODUPDATA - enter the new key/data pair only if it does not
* already appear in the database. This flag may only be specified
* if the database was opened with #MDB_DUPSORT. The function will

19
libraries/liblmdb/mdb.c
View File

@ -2728,10 +2728,11 @@ mdb_freelist_save(MDB_txn *txn)
MDB_ID save;
mdb_tassert(txn, len >= 0 && id <= env->me_pglast);
key.mv_data = &id;
if (len > mop_len) {
len = mop_len;
data.mv_size = (len + 1) * sizeof(MDB_ID);
/* Drop MDB_CURRENT when changing the data size */
key.mv_data = &id;
flags = 0;
}
data.mv_data = mop -= len;
@ -5761,7 +5762,7 @@ mdb_cursor_put(MDB_cursor *mc, MDB_val *key, MDB_val *data,
unsigned int nflags;
DKBUF;
if (mc == NULL || key == NULL)
if (mc == NULL)
return EINVAL;
env = mc->mc_txn->mt_env;
@ -5782,8 +5783,16 @@ mdb_cursor_put(MDB_cursor *mc, MDB_val *key, MDB_val *data,
if (mc->mc_txn->mt_flags & (MDB_TXN_RDONLY|MDB_TXN_ERROR))
return (mc->mc_txn->mt_flags & MDB_TXN_RDONLY) ? EACCES : MDB_BAD_TXN;
if (flags != MDB_CURRENT && key->mv_size-1 >= ENV_MAXKEY(env))
return MDB_BAD_VALSIZE;
if (flags != MDB_CURRENT) {
if (key == NULL)
return EINVAL;
if (key->mv_size-1 >= ENV_MAXKEY(env))
return MDB_BAD_VALSIZE;
} else {
/* Ignore key except in sub-cursor, where key holds the data */
if (!(mc->mc_flags & C_SUB))
key = NULL;
}
#if SIZE_MAX > MAXDATASIZE
if (data->mv_size > ((mc->mc_db->md_flags & MDB_DUPSORT) ? ENV_MAXKEY(env) : MAXDATASIZE))
@ -6107,7 +6116,7 @@ current:
*/
if (F_ISSET(flags, MDB_RESERVE))
data->mv_data = olddata.mv_data;
else if (data->mv_size)
else if (!(mc->mc_flags & C_SUB))
memcpy(olddata.mv_data, data->mv_data, data->mv_size);
else
memcpy(NODEKEY(leaf), key->mv_data, key->mv_size);