make sure the buffer holding the command line is always NUL terminated

netcat.c

@@ -1408,7 +1408,8 @@ main (argc, argv)
     argv[1] = cp;			/* head of new arg block */
     fprintf (stderr, "Cmd line: ");
     fflush (stderr);		/* I dont care if it's unbuffered or not! */
-    insaved = read (0, cp, BIGSIZ);	/* we're gonna fake fgets() here */
+    insaved = read (0, cp, BIGSIZ-1);	/* we're gonna fake fgets() here */
+    cp[BIGSIZ-1] = '\0';
     if (insaved <= 0)
       bail ("wrong");
     x = findline (cp, insaved);