Merge pull request #1523 from bansiesta/geofence_parse_fix

Geofence parse fix

src/modules/navigator/geofence.cpp

@@ -279,8 +279,14 @@ Geofence::loadFromFile(const char *filename)
 		while((textStart < sizeof(line)/sizeof(char)) && isspace(line[textStart])) textStart++;
 
 		/* if the line starts with #, skip */
-		if (line[textStart] == commentChar)
+		if (line[textStart] == commentChar) {
 			continue;
+		}
+
+		/* if there is only a linefeed, skip it */
+		if (line[0] == '\n') {
+			continue;
+		}
 
 		if (gotVertical) {
 			/* Parse the line as a geofence point */
@@ -291,8 +297,10 @@ Geofence::loadFromFile(const char *filename)
 				/* Handle degree minute second format */
 				float lat_d, lat_m, lat_s, lon_d, lon_m, lon_s;
 
-				if (sscanf(line, "DMS %f %f %f %f %f %f", &lat_d, &lat_m, &lat_s, &lon_d, &lon_m, &lon_s) != 6)
+				if (sscanf(line, "DMS %f %f %f %f %f %f", &lat_d, &lat_m, &lat_s, &lon_d, &lon_m, &lon_s) != 6) {
+					warnx("Scanf to parse DMS geofence vertex failed.");
 					return ERROR;
+				}
 
 //				warnx("Geofence DMS: %.5f %.5f %.5f ; %.5f %.5f %.5f", (double)lat_d, (double)lat_m, (double)lat_s, (double)lon_d, (double)lon_m, (double)lon_s);
 
@@ -301,9 +309,10 @@ Geofence::loadFromFile(const char *filename)
 
 			} else {
 				/* Handle decimal degree format */
-
-				if (sscanf(line, "%f %f", &(vertex.lat), &(vertex.lon)) != 2)
+				if (sscanf(line, "%f %f", &(vertex.lat), &(vertex.lon)) != 2) {
+					warnx("Scanf to parse geofence vertex failed.");
 					return ERROR;
+				}
 			}
 
 			if (dm_write(DM_KEY_FENCE_POINTS, pointCounter, DM_PERSIST_POWER_ON_RESET, &vertex, sizeof(vertex)) != sizeof(vertex))