struct MyFuncPad {
   int count;
};

/* Creates a list of ints, numbered 1 to the int located at *pad. */
void my_func(struct NestedLoopList* list_ptr, void* pad) {
   int  count = (*(MyFuncPad*)pad).count;
   int* array = (int*)calloc(count, sizeof(int));
   int i;
   for (i=0; i<count; i++) {
      array[i] = i+1;
   }
   (*list_ptr).elem_size = sizeof(int);
   (*list_ptr).length    = count;
   (*list_ptr).ptr       = array;
   (*list_ptr).free_ptr  = 1;
}