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 bytes_to_read = (n > cb->count) ? cb->count : n;

    for (int i = 0; i < bytes_to_read; i++) {
        printf("%d", cb->buffer[cb->tail]);
        cb->tail = (cb->tail + 1) % cb->capacity;  // wrap around

        if (i < bytes_to_read - 1)
            printf(" ");
    }

    
    for (int i = bytes_to_read; i < n; i++) {
        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;
}

Solving Approach