sensors-detect: Rework option handling

Rework the way command line options are handled. If we ever need more
than this, we should consider moving to some GetOpt perl module.

CHANGES

@@ -12,6 +12,7 @@ SVN HEAD
                   Add a PCI ID for new family 15h AMD processors
                   Introduce automatic mode (--auto)
                   Detect incorrect non-interactive runs
+                  Rework option handling
 
 3.3.4 (2013-05-27)
   sensors.conf.5: Mention "sensors -u" to get the raw feature names

prog/detect/sensors-detect

@@ -6824,14 +6824,22 @@ sub main
 {
 	my ($input, $superio_features);
 
-	# Handle special command line cases first
-	if (defined $ARGV[0] && $ARGV[0] eq "--stat") {
-		show_i2c_stats();
-		exit 0;
+	# Parse command line options
+	while (defined $ARGV[0]) {
+		if ($ARGV[0] eq "--stat") {
+			$opt{stat} = 1;
+		} elsif ($ARGV[0] eq "--auto") {
+			$opt{auto} = 1;
+		} else {
+			print STDERR "Error: unknown option $ARGV[0]\n";
+			exit 1;
+		}
+		shift @ARGV;
 	}
 
-	if (defined $ARGV[0] && $ARGV[0] eq "--auto") {
-		$opt{auto} = 1;
+	if ($opt{stat}) {
+		show_i2c_stats();
+		exit 0;
 	}
 
 	# We won't go very far if not root