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) {
    // Your logic here
    int null_s = 0;
    for (size_t i=0; i<n; i++){
        int pos = ((*cb).tail + i) % (*cb).capacity;
        char val[32];
        if ((*cb).count > 0) {
            sprintf(val, "%d", (*cb).buffer[pos]);
        } else {
            sprintf(val, "NULL");
            null_s++;
        }

        if (i+1 == n){
            printf("%s", val);
        } else {
            printf("%s ", val);
        }
        (*cb).count--;
    }
    (*cb).tail = ((*cb).tail + (n - null_s)) % (*cb).capacity;
    printf("\nTail: %d", (*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;
}