86. Circular Buffer Read

#include <stdio.h>

typedef struct {
    int buffer[10];
    int head;
    int tail;
    int count;
    int capacity;
} CircularBuffer;

void read_bytes(CircularBuffer *cb, int n) {
    while(cb->count && n)
    {
        printf("%d",cb->buffer[cb->tail]);
        cb->tail = (cb->tail+1)%cb->capacity;
        cb->count--;
        n--;
        if(cb->count != 0 && n!=0) printf(" ");
    }
    while(n--)
    {
        printf(" NULL");
    }
    printf("\nTail: %d\n",cb->tail);
}

int main() {
    CircularBuffer cb = {
        .buffer = {10, 20, 30, 40, 50, 60, 70, 80, 90, 100},
        .head = 3,
        .tail = 7,
        .count = 6,
        .capacity = 10
    };

    int n;
    scanf("%d", &n);
    read_bytes(&cb, n);

    return 0;
}