Add 'location_t' data structure

Instead of having people treat latitude and longitude as separate
things, just add a 'location_t' data structure that contains both.

Almost all cases want to always act on them together.

This is really just prep-work for adding a few more locations that we
track: I want to add a entry/exit location to each dive (independent of
the dive site) because of how the Garmin Descent gives us the
information (and hopefully, some day, other dive computers too).

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 23 insertions, 0 deletions

diff --git a/core/units.h b/core/units.h
index 6e9fe50d9..0e2c2b2e3 100644
--- a/core/units.h
+++ b/core/units.h
@@ -134,6 +134,29 @@ typedef struct
 	int udeg;
 } degrees_t;
 
+typedef struct pos {
+	degrees_t lat, lon;
+} location_t;
+
+static inline bool has_location(const location_t *loc)
+{
+	return loc->lat.udeg || loc->lon.udeg;
+}
+
+static inline bool same_location(const location_t *a, const location_t *b)
+{
+	return (a->lat.udeg == b->lat.udeg) && (a->lon.udeg == b->lon.udeg);
+}
+
+static inline location_t create_location(double lat, double lon)
+{
+	location_t location = {
+		{ (int) lrint(lat * 1000000) },
+		{ (int) lrint(lon * 1000000) }
+	};
+	return location;
+}
+
 static inline double udeg_to_radians(int udeg)
 {
 	return (udeg * M_PI) / (1000000.0 * 180.0);