Support gps coordinates for the location info

Sadly, no way to show them yet.  But it would be nice to let people
enter them (and it would be doubly nice to have a dive computer that
does it at the surface), and then perhaps just do the "point browser at
google maps" thing.

Saving/parsing tested by hand-feeding the location of Enenui (Molokini
Crater) from google maps by hand into my divelog.

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

1 files changed, 28 insertions, 1 deletions

diff --git a/save-xml.c b/save-xml.c
index 42bd17e9f..e64b380a4 100644
--- a/save-xml.c
+++ b/save-xml.c
@@ -147,12 +147,39 @@ static void save_temperatures(FILE *f, struct dive *dive)
 	fputs(" />\n", f);
 }
 
+static void show_location(FILE *f, struct dive *dive)
+{
+	char buffer[80];
+	const char *prefix = "  <location>";
+	double latitude = dive->latitude;
+	double longitude = dive->longitude;
+
+	/*
+	 * Ok, theoretically I guess you could dive at
+	 * exactly 0,0. But we don't support that. So
+	 * if you do, just fudge it a bit, and say that
+	 * you dove a few meters away.
+	 */
+	if (latitude || longitude) {
+		int len = snprintf(buffer, sizeof(buffer)-4,
+			"  <location gps='%f %f'>",
+			latitude, longitude);
+		if (!dive->location) {
+			memcpy(&buffer[len-1], "/>\n", 4);
+			fputs(buffer, f);
+			return;
+		}
+		prefix = buffer;
+	}
+	show_utf8(f, dive->location, prefix,"</location>\n");
+}
+
 static void save_overview(FILE *f, struct dive *dive)
 {
 	save_depths(f, dive);
 	save_temperatures(f, dive);
 	show_duration(f, dive->surfacetime, "  <surfacetime>", "</surfacetime>\n");
-	show_utf8(f, dive->location, "  <location>","</location>\n");
+	show_location(f, dive);
 	show_utf8(f, dive->divemaster, "  <divemaster>","</divemaster>\n");
 	show_utf8(f, dive->buddy, "  <buddy>","</buddy>\n");
 	show_utf8(f, dive->notes, "  <notes>","</notes>\n");