dupnode
struct dupnode *next;
dupcheck(struct man_node *mnp, struct dupnode **dnp)
struct dupnode *curdnp;
if ((curdnp = calloc(1, sizeof (struct dupnode))) == NULL)
free_dupnode(struct dupnode *dnp)
struct dupnode *dnp2;
static int dupcheck(struct man_node *, struct dupnode **);
static void free_dupnode(struct dupnode *);
struct dupnode *didup = NULL;