ellipsoid_in()

Datum ellipsoid_in

(

PG_FUNCTION_ARGS

)

Definition at line 81 of file lwgeom_spheroid.c.

{
        char *str = PG_GETARG_CSTRING(0);
        SPHEROID *sphere = (SPHEROID *) palloc(sizeof(SPHEROID));
        int nitems;
        double rf;
 
        memset(sphere,0, sizeof(SPHEROID));
 
        if (strstr(str,"SPHEROID") !=  str )
        {
                elog(ERROR,"SPHEROID parser - doesn't start with SPHEROID");
                pfree(sphere);
                PG_RETURN_NULL();
        }
 
        nitems = sscanf(str,"SPHEROID[\"%19[^\"]\",%lf,%lf]",
                        sphere->name, &sphere->a, &rf);
 
        if ( nitems==0)
                nitems = sscanf(str,"SPHEROID(\"%19[^\"]\",%lf,%lf)",
                                sphere->name, &sphere->a, &rf);
 
        if (nitems != 3)
        {
                elog(ERROR,"SPHEROID parser - couldnt parse the spheroid");
                pfree(sphere);
                PG_RETURN_NULL();
        }
 
        sphere->f = 1.0/rf;
        sphere->b = sphere->a - (1.0/rf)*sphere->a;
        sphere->e_sq = ((sphere->a*sphere->a) - (sphere->b*sphere->b)) /
                       (sphere->a*sphere->a);
        sphere->e = sqrt(sphere->e_sq);
 
        PG_RETURN_POINTER(sphere);
 
}

References SPHEROID::a, SPHEROID::b, SPHEROID::e, SPHEROID::e_sq, SPHEROID::f, and SPHEROID::name.