Might be a good idea, might not. Not yet tested

nmalloc.c

bool nmalloc(size_t n, void ***elts, ...)
{
	va_list ap;
	*elts = malloc(n * sizeof **elts);
	if (!*elts)
		return false;

	va_start(ap, elts);
	for (size_t i = 0; i < n; i++)
	{
		(*elts)[i] = malloc(va_arg(ap, size_t));
		if (!(*elts)[i])
		{
			for (size_t j = 0; j < i; j++)
				free((*elts)[j]);
			free(*elts);
			return false;
		}
	}
	va_end(ap);
	return true;
}