#include <assert.h>

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

void* allocation;

int main() {

const int MB = 1024 * 1024;

const int CHUNK = 512 * MB;

long num_allocations;

for (num_allocations = 0;; num_allocations++) {

allocation = malloc(CHUNK);

if (!allocation) {

puts("failed to allocate any more");

break;

}

printf("%ld: Allocated %d MB, total so far: %ld MB\n",

num_allocations, CHUNK / MB,

(num_allocations * CHUNK) / MB);

printf(" (writing to make sure, to %p)\n", allocation);

memset(allocation, 42, CHUNK);

}

// We should have allocated at least 2GB.

assert(num_allocations >= 4);

// We should have allocated less than 4GB (we can't get to exactly 4GB

// since we started with some small amount, and then add 512MB chunks).

assert(num_allocations < 8);

puts("success");

}