sdp3x: add argc check and use px4_getopt

src/drivers/differential_pressure/sdp3x/SDP3X_main.cpp

@@ -32,6 +32,7 @@
  ****************************************************************************/
 
 #include "SDP3X.hpp"
+#include <px4_getopt.h>
 
 // Driver 'main' command.
 extern "C" __EXPORT int sdp3x_airspeed_main(int argc, char *argv[]);
@@ -164,36 +165,49 @@ sdp3x_airspeed_main(int argc, char *argv[])
 {
 	uint8_t i2c_bus = PX4_I2C_BUS_DEFAULT;
 
-	for (int i = 1; i < argc; i++) {
-		if (strcmp(argv[i], "-b") == 0 || strcmp(argv[i], "--bus") == 0) {
-			if (argc > i + 1) {
-				i2c_bus = atoi(argv[i + 1]);
+	int myoptind = 1;
+	int ch;
+	const char *myoptarg = nullptr;
+
+	while ((ch = px4_getopt(argc, argv, "b:", &myoptind, &myoptarg)) != EOF) {
+		switch (ch) {
+		case 'b':
+			i2c_bus = atoi(myoptarg);
+			break;
+
+		default:
+			sdp3x_airspeed_usage();
+			return 0;
 		}
 	}
+
+	if (myoptind >= argc) {
+		sdp3x_airspeed_usage();
+		return -1;
 	}
 
+
 	/*
 	 * Start/load the driver.
 	 */
-	if (!strcmp(argv[1], "start")) {
+	if (!strcmp(argv[myoptind], "start")) {
 		return sdp3x_airspeed::start(i2c_bus);
 	}
 
 	/*
 	 * Stop the driver
 	 */
-	if (!strcmp(argv[1], "stop")) {
+	if (!strcmp(argv[myoptind], "stop")) {
 		return sdp3x_airspeed::stop();
 	}
 
 	/*
 	 * Reset the driver.
 	 */
-	if (!strcmp(argv[1], "reset")) {
+	if (!strcmp(argv[myoptind], "reset")) {
 		return sdp3x_airspeed::reset();
 	}
 
 	sdp3x_airspeed_usage();
-
-	return PX4_OK;
+	return 0;
 }