memory.cpp

// Type your code here, or load an example.
#include <cstddef>
#include <cstdlib>
#include <cstdio>

typedef unsigned long buf_t;

struct T {
    unsigned long size;
    T* next;
    buf_t data[0];
};


static buf_t buffer[200];
constexpr auto buffer_size = sizeof(buffer) / sizeof(buffer[0]);
static unsigned int head = 4;

int main() {
    unsigned char* data = (unsigned char*)buffer;
    for (int i = 0; i < buffer_size; i++) {
        buffer[i] = (buf_t)-1;
    }
    T* t = (T*)(data + head);

    const int length = 5;
    t->size = length;


    const int byte_size_a = (offsetof(T, next) * 2) + (t->size * sizeof(buf_t));
    //printf("%d\n", byte_size);
    

    //T* t = (T*)malloc(byte_size);

    for (unsigned int i = 0; i < t->size; i++) {
        t->data[i] = (buf_t)i + 1;
    }

    head += byte_size_a;
    T* tt = (T*)(data + head);
    t->next = (T*)0xA1A2A3A4A5A6A7A8;
    tt->next = (T*)-1;
    tt->size = length + 5;
    for (unsigned int i = 0; i < tt->size; i++) {
      tt->data[i] = (buf_t)i * 2;
    }


    for (unsigned int i = 0; i < buffer_size * 2; i++) {
        printf("[%d- %d]: \t%u\n", i, i * 4, data[i]);
    }
    //return sizeof(T);
    return offsetof(T, data[0]);
}