buf_compare(const void *s1, const void *s2)
{
    buf_T *buf1 = *(buf_T **)s1;
    buf_T *buf2 = *(buf_T **)s2;

    if (buf1->b_last_used == buf2->b_last_used)
	return 0;
    return buf1->b_last_used > buf2->b_last_used ? -1 : 1;
}
buf_compare(const void *s1, const void *s2)
{
    buf_T *buf1 = *(buf_T **)s1;
    buf_T *buf2 = *(buf_T **)s2;

    if (buf1->b_last_used == buf2->b_last_used)
	return 0;
    return buf1->b_last_used > buf2->b_last_used ? -1 : 1;
}