y = *p = tree->avl_alloc->libavl_malloc (tree->avl_alloc, sizeof *y); if (y == NULL) { *data = NULL; return 0; } y->avl_data = **data; *data = &y->avl_data; y->avl_link[0] = y->avl_link[1] = NULL; y->avl_balance = 0; tree->avl_count++; tree->avl_generation++; return 1;