delete_stack_t
delete_stack_t *cur = dip->di_stack;
delete_stack_t *new = dip->di_free;
delete_stack_t *cur = dip->di_stack;
delete_stack_t *cur;
#define DELETE_STACK_SIZE(x) offsetof(delete_stack_t, ds_buf[(x)])
delete_stack_t *di_stack;
delete_stack_t *di_free;