Added get_heap_size function.

main.c

@@ -153,6 +153,13 @@ void free(void* ptr)
 		brk(b);
 }
 
+/// Retrieves the total heap usage in bytes.
+/// @returns Usage in bytes.
+size_t get_heap_size()
+{
+	return ((char*)last + last->size) - (char*)first;
+}
+
 int main()
 {
 	int* a = (int*)malloc(sizeof(int));
@@ -163,6 +170,7 @@ int main()
 
 	printf("Test 1: %i\n", *a);
 	printf("Test 2: %i\n", *b);
+	printf("Heap Size: %zu Bytes\n", get_heap_size());
 
 	free(a);
 	free(b);