static void free_found(struct found_uids *ff)
{
    free(ff->found);
    ff->found = NULL;
    ff->nalloc = 0;
    ff->nused = 0;
    ff->pos = 0;
}
static void free_found(struct found_uids *ff)
{
    free(ff->found);
    ff->found = NULL;
    ff->nalloc = 0;
    ff->nused = 0;
    ff->pos = 0;
}