gistfile1.c

static bool array_add(void*** array_ptr,
                      size_t* used_ptr,
                      size_t* length_ptr,
                      void* value)
{
	void** array;
	memcpy(&array, array_ptr, sizeof(array));

	if ( *used_ptr == *length_ptr )
	{
		size_t new_length = 2 * *length_ptr;
		if ( !new_length )
			new_length = 16;
		size_t new_size = new_length * sizeof(void*);
		void** new_array = (void**) realloc(array, new_size);
		if ( !new_array )
			return false;
		array = new_array;
		memcpy(array_ptr, &array, sizeof(array));
		*length_ptr = new_length;
	}

	memcpy(array + (*used_ptr)++, &value, sizeof(value));

	return true;
}