Circular Buffer Read

Code

#include <stdio.h>

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

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

Solving Approach