fill_curve_param
fill_curve_param(p, curve->p, cur_sz, curve->g.ndigits);
fill_curve_param(a, curve->a, cur_sz, curve->g.ndigits);
fill_curve_param(b, curve->b, cur_sz, curve->g.ndigits);
fill_curve_param(x, curve->g.x, cur_sz, curve->g.ndigits);
fill_curve_param(y, curve->g.y, cur_sz, curve->g.ndigits);
fill_curve_param(n, curve->n, cur_sz, curve->g.ndigits);