static int change_compar(const void *a, const void *b)
{
    struct index_change *ac = (struct index_change *)a;
    struct index_change *bc = (struct index_change *)b;

    if (ac->record.recno > bc->record.recno)
        return 1;
    if (ac->record.recno < bc->record.recno)
        return -1;
    return 0;
}
static int change_compar(const void *a, const void *b)
{
    struct index_change *ac = (struct index_change *)a;
    struct index_change *bc = (struct index_change *)b;

    if (ac->record.recno > bc->record.recno)
        return 1;
    if (ac->record.recno < bc->record.recno)
        return -1;
    return 0;
}