--- 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);

 }