radix_mask_head
struct radix_mask_head *rmh;
R_Zalloc(rmh, struct radix_mask_head *, sizeof (*rmh));
rn_addmask(const void *n_arg, struct radix_mask_head *maskhead, int search, int skip)
static struct radix_node *rn_addmask(const void *, struct radix_mask_head *, int,int);
struct radix_mask_head;
struct radix_mask_head *rnh_masks; /* Storage for our masks */
struct radix_mask_head rmhead; /* masks radix head */