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Tweak cursor_next C_EOF check

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Allow C_EOF flag to be stale
This commit is contained in:
Howard Chu 2017-01-11 10:33:28 +00:00
parent c97f4ed1ae
commit ab18b27d7b
1 changed files with 27 additions and 7 deletions
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34
libraries/liblmdb/mdb.c
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@ -5821,15 +5821,20 @@ mdb_cursor_next(MDB_cursor *mc, MDB_val *key, MDB_val *data, MDB_cursor_op op)
MDB_node *leaf;
int rc;
if ((mc->mc_flags & C_EOF) ||
((mc->mc_flags & C_DEL) && op == MDB_NEXT_DUP)) {
if ((mc->mc_flags & C_DEL && op == MDB_NEXT_DUP))
return MDB_NOTFOUND;
}
if (!(mc->mc_flags & C_INITIALIZED))
return mdb_cursor_first(mc, key, data);
mp = mc->mc_pg[mc->mc_top];
if (mc->mc_flags & C_EOF) {
if (mc->mc_ki[mc->mc_top] >= NUMKEYS(mp)-1)
return MDB_NOTFOUND;
mc->mc_flags ^= C_EOF;
}
if (mc->mc_db->md_flags & MDB_DUPSORT) {
leaf = NODEPTR(mp, mc->mc_ki[mc->mc_top]);
if (F_ISSET(leaf->mn_flags, F_DUPDATA)) {
@ -6340,10 +6345,19 @@ mdb_cursor_get(MDB_cursor *mc, MDB_val *key, MDB_val *data,
rc = MDB_INCOMPATIBLE;
break;
}
rc = MDB_SUCCESS;
if (!(mc->mc_xcursor->mx_cursor.mc_flags & C_INITIALIZED) ||
(mc->mc_xcursor->mx_cursor.mc_flags & C_EOF))
if (!(mc->mc_xcursor->mx_cursor.mc_flags & C_INITIALIZED)) {
rc = EINVAL;
break;
}
if (mc->mc_xcursor->mx_cursor.mc_flags & C_EOF) {
MDB_cursor *mx = &mc->mc_xcursor->mx_cursor;
if (mx->mc_ki[mx->mc_top] >= NUMKEYS(mx->mc_pg[mx->mc_top])-1) {
rc = MDB_NOTFOUND;
break;
}
mx->mc_flags ^= C_EOF;
}
rc = MDB_SUCCESS;
goto fetchm;
case MDB_NEXT_MULTIPLE:
if (data == NULL) {
@ -7651,9 +7665,15 @@ mdb_cursor_count(MDB_cursor *mc, size_t *countp)
if (!(mc->mc_flags & C_INITIALIZED))
return EINVAL;
if (!mc->mc_snum || (mc->mc_flags & C_EOF))
if (!mc->mc_snum)
return MDB_NOTFOUND;
if (mc->mc_flags & C_EOF) {
if (mc->mc_ki[mc->mc_top] >= NUMKEYS(mc->mc_pg[mc->mc_top]))
return MDB_NOTFOUND;
mc->mc_flags ^= C_EOF;
}
leaf = NODEPTR(mc->mc_pg[mc->mc_top], mc->mc_ki[mc->mc_top]);
if (!F_ISSET(leaf->mn_flags, F_DUPDATA)) {
*countp = 1;