/* Returns 0 on success, and -ve on error.
*/
static int valid_gps(struct gps_location *loc)
{
/* TODO: Important.
* Can't do direct floating comparison as that causes a compiler error.
* From Piazza, it was mentioned that we should return an error
* only if the GPS coordinates are all zeros, so we just check for
* that
* https://piazza.com/class#fall2012/comsw4118/1065
*/
const double zero_d = 0;
const float zero_f = 0;
unsigned long long int err_lat = double_to_long(zero_d);
unsigned long long int err_lng = double_to_long(zero_d);
unsigned int err_acc = float_to_int(zero_f);
unsigned long long int loc_lat;
unsigned long long int loc_lng;
unsigned int loc_acc;
if (loc == NULL)
return -EINVAL;
loc_lat = double_to_long(loc->latitude);
loc_lng = double_to_long(loc->longitude);
loc_acc = float_to_int(loc->accuracy);
if (loc_lat == err_lat && loc_lng == err_lng && loc_acc == err_acc)
return -EINVAL;
else
return 0;
}
long __fixdfdi(double a)
{
double_t da;
da.val = a;
return double_to_long(da.data);
}
