Add proper command line parsing

DCDBCSVImport/dcdbcsvimport.cpp

@@ -32,15 +32,46 @@ typedef struct {
 	std::string publicName;
 } sensor_t;
 
+void usage(int argc, char* argv[])
+{
+  std::cout << "Usage: " << argv[0] << " [-h <host>] <CSV File> <SensorPrefix>" << std::endl << std::endl;
+  std::cout << "    -h <host>      - Database hostname" << std::endl;
+  std::cout << "    CSV File       - CSV file with sensor readings. First row has to contain sensor names" << std::endl;
+  std::cout << "    SensorPrefix   - Prefix to use for sensor names" << std::endl;
+}
+
 int main(int argc, char** argv)
 {
+  /* Check command line parameters */
+  if (argc < 3) {
+      usage(argc, argv);
+      exit(EXIT_FAILURE);
+  }
+
+  int ret;
+  const char *host = getenv("DCDB_HOSTNAME");
+  if (!host) {
+      host = "localhost";
+  }
+
+  while ((ret=getopt(argc, argv, "+h:"))!=-1) {
+      switch(ret) {
+          case 'h':
+              host = optarg;
+              break;
+          default:
+              usage(argc, argv);
+              exit(EXIT_FAILURE);
+      }
+  }
+
   /* Connect to the data store */
   std::cout << std::endl;
   std::cout << "Connecting to the data store..." << std::endl;
 
   DCDB::Connection* connection;
   connection = new DCDB::Connection();
-  connection->setHostname("127.0.0.1");
+  connection->setHostname(host);
   if (!connection->connect()) {
       std::cout << "Cannot connect to database." << std::endl;
       return 1;