--- src/usr.bin/nc/netcat.c.orig	2005-01-07 08:43:25 +0300
+++ src/usr.bin/nc/netcat.c	2005-01-07 08:52:05 +0300
@@ -115,4 +115,7 @@
 	endp = NULL;
 	sv = NULL;
 
+	if (argc < 1)
+		usage(1);
+
 	while ((ch = getopt(argc, argv,
@@ -794,9 +797,9 @@
 void
 usage(int ret)
 {
-	fprintf(stderr, "usage: nc [-46DdhklnrStUuvz] [-i interval] [-p source_port]\n");
-	fprintf(stderr, "\t  [-s source_ip_address] [-T ToS] [-w timeout] [-X proxy_version]\n");
-	fprintf(stderr, "\t  [-x proxy_address[:port]] [hostname] [port[s]]\n");
+	fprintf(stderr, "usage: netcat [-46DdhklnrStUuvz] [-i interval] [-p source_port]\n");
+	fprintf(stderr, "              [-s source_ip_address] [-w timeout] [-X proxy_version]\n");
+	fprintf(stderr, "              [-x proxy_address[:port]] [hostname] [port[s]]\n");
 	if (ret)
 		exit(1);
 }