bt_stack 315 libdb/btree.h #define BT_POP(t) (t->bt_sp == t->bt_stack ? NULL : --t->bt_sp) bt_stack 316 libdb/btree.h #define BT_CLR(t) (t->bt_sp = t->bt_stack) bt_stack 317 libdb/btree.h EPGNO bt_stack[50]; /* stack of parent pages */