ll_queue.c

#include "linklist.h"

extern void *ll_delete_head (LINKLIST *list);
extern void *ll_delete_tail (LINKLIST *list);
extern void *ll_tail (LINKLIST *list);
extern void *ll_head (LINKLIST *list);

/* head of list = top of deque */
/* tail of list = bottom of deque */

void *dq_pop (DEQUE *dq)
{
    return ll_delete_head (dq);
}

void *dq_top (DEQUE *dq)
{
    return ll_head (dq);
}

void *dq_eject (DEQUE *dq)
{
    return ll_delete_tail(dq);
}

void *dq_bottom (DEQUE *dq)
{
    return ll_tail (dq);
}