/**
* Compare two abstract data objects.
* @arg a Abstract data object.
* @arg b Another abstract data object.
* @return An integer less than, equal to, or greater than zero if
* a is found, respectively, to be less than, to match, or
* be greater than b.
*/
int nl_data_cmp(struct nl_data *a, struct nl_data *b)
{
void *a_ = nl_data_get(a);
void *b_ = nl_data_get(b);
if (a_ && b_)
return memcmp(a_, b_, nl_data_get_size(a));
else
return -1;
}
void *rtnl_cls_data(struct rtnl_cls *cls)
{
if (!cls->c_subdata) {
struct rtnl_cls_ops *ops = cls->c_ops;
if (!ops) {
if (!cls->c_kind[0])
BUG();
ops = __rtnl_cls_lookup_ops(cls->c_kind);
if (ops == NULL)
return NULL;
cls->c_ops = ops;
}
if (!ops->co_size)
BUG();
if (!(cls->c_subdata = nl_data_alloc(NULL, ops->co_size)))
return NULL;
}
return nl_data_get(cls->c_subdata);
}