Add support for VIDEOHUB_HOST and VIDEOHUB_PORT env variables.

ChangeLog

@@ -8,6 +8,7 @@ xxxx-xx-xx : Version next
    and video output routing.
  * Add --list-device, --list-vinputs and --list-voutputs parameters.
  * Display last update time in --monitor.
+ * Add support for VIDEOHUB_HOST and VIDEOHUB_PORT env variables.
 
 2014-11-27 : Version 0.2
  * Fix port routing. Previously it was reversed and incorrect.

README

@@ -102,6 +102,21 @@ Configuration:
   NOTE: For <in_X/out_X/in_Y> you may use port number or port name.
 
 
+Environment variables
+=====================
+
+The following environment variables are checked and used by the program
+if they are set:
+
+ VIDEOHUB_HOST
+    Sets the device host name. It is equivallent to using -h / --host
+    command line parameter.
+
+ VIDEOHUB_PORT
+    Sets the device port. It is equivallent to using -p / --port command
+    line parameter.
+
+
 Example usage
 =============
 

videohubctrl.c

@@ -107,8 +107,12 @@ static struct run_cmds {
 static void parse_options(struct videohub_data *data, int argc, char **argv) {
 	int j, err = 0;
 	struct vcmd_entry *c = &parsed_cmds.entry[0];
+	// Check environment
+	data->dev_host = getenv("VIDEOHUB_HOST");
+	data->dev_port = getenv("VIDEOHUB_PORT");
 	// Set defaults
-	data->dev_port = "9990";
+	if (!data->dev_port)
+		data->dev_port = "9990";
 	while ((j = getopt_long(argc, argv, short_options, long_options, NULL)) != -1) {
 		if (j == '?') // Invalid parameter
 			exit(EXIT_FAILURE);