replace command line arguments parser with built-in getopt code

yasnd.c

@@ -3,6 +3,7 @@
 #include <fcntl.h>
 #include <errno.h>
 #include <syslog.h>
+#include <getopt.h>
 #include <confuse.h>
 
 #include "yasnd.h"
@@ -373,12 +374,21 @@ void signal_handler(int signum)
 
 void arg_parse(int argc, char *argv[])
 {
-	for (int i=0;i<argc;i++)
+	int c;
+	struct option option_string[] =
 	{
-		if (strcmp(argv[i],"--init")==0)
+		{"init", no_argument, NULL, 'i'},
+	};
+	while ((c = getopt_long(argc, argv,"i", option_string, NULL)) != 0)
 	{
+		switch(c)
+		{
+			case 'i':
 				lpt_lock();
 				exit(EXIT_SUCCESS);
+				break;
+			default:
+				break;
 		}
 	}
 }