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/*
* Add hard-coded names to a queue a print them to stdout.
* This is free and unencumbered software released into the public domain.
*/
#include <stdio.h>
#include <stdlib.h>
#include "construct.h"
typedef struct {
construct *front;
construct *rear;
} queue;
queue *mkq()
{
queue *q = malloc(sizeof(queue));
q->front = q->rear = NULL;
}
int qempty(queue *q)
{
return q->front == NULL;
}
void qpush(queue *q, void *item)
{
if (qempty(q))
q->front = q->rear = cons(item, NULL);
else
q->rear = q->rear->cdr = cons(item, NULL);
}
void *qpop(queue *q)
{
if (qempty(q))
return NULL;
void *first = car(q->front);
construct *rest = cdr(q->front);
free(q->front);
q->front = rest;
return first;
}
int main()
{
queue *q = mkq();
qpush(q, "Mahathir Mohamad");
qpush(q, "Elizabeth II");
qpush(q, "Sheikh Sabah Al-Ahmad Al-Jaber Al-Sabah");
qpush(q, "Paul Biya");
qpush(q, "Michel Aoun");
qpush(q, "Mahmoud Abbas");
qpush(q, "Francis");
while (!qempty(q))
puts(qpop(q));
return 0;
}
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