p->pos, p->cat, p->pos/CAT_MAX);
memcpy (p->buf, &b->file[p->cat].head.free_list, sizeof(zint));
b->file[p->cat].head.free_list = p->pos;
p->pos, p->cat, p->pos/CAT_MAX);
memcpy (p->buf, &b->file[p->cat].head.free_list, sizeof(zint));
b->file[p->cat].head.free_list = p->pos;