Function geod_genposition 

pub fn geod_genposition(
    l: &GeodGeodesicline,
    flags: u32,
    s12_a12: f64,
    plat2: &mut f64,
    plon2: &mut f64,
    pazi2: &mut f64,
    ps12: &mut f64,
    pm12: &mut f64,
    p_m12: &mut f64,
    p_m21: &mut f64,
    p_s12: &mut f64,
) -> f64

Compute the geodesic position between two points