#include "FIFO.h"
#include <stdio.h>
#include <stdlib.h>

void Init(FIFO *val)
{
    val->arr = (char*)malloc(sizeof(char)*_SIZE);
    val->amount = 0;
    val->read = 0;
    val->write = 0;
}

void Push(FIFO *val, char c)
{
    if(val->amount == _SIZE)
    {
        printf("Queue is full, cannot push!\n");
        return;
    }
    val->arr[val->write] = c;
    val->write = (val->write+1) % _SIZE;
    val->amount++;
    return;
}

char Pop(FIFO *val)
{
    char c;
    if(val->amount == 0)
    {
        printf("Queue is empty, cannot pop!\n");
        return 0;
    }
    c = val->arr[val->read];
    val->read = (val->read + 1) % _SIZE;
    val->amount--;
    return c;
}

char First(FIFO *val)
{
    char c;
    if(val->amount == 0)
    {
        printf("Queue is empty, cannot top!\n");
        return 0;
    }
    c = val->arr[val->read];
    return c;
}

int GetAmount(FIFO *val)
{
    return val->amount;
}