nvtsrv: Fix inconsistent help

nvtsrv/nvtsrv.c

@@ -14,9 +14,15 @@
 #include "telnet.h"
 
 
-#define HELP \
-    "Usage: nvtsrv -deq\n"
-
+/**INDENT-OFF**/
+static const char help_text[] =
+    "Usage: nvtsrv OPTIONS... HOST:PORT\n"
+    "OPTIONS:\n"
+    "  -d         : Enable debug\n"
+    "  -e         : Echo received data\n"
+    "  -q         : Quiet\n"
+    ;
+/**INDENT-ON**/
 
 struct {
     unsigned char   mline;
@@ -30,10 +36,10 @@ int             nfds;
 #define fd_cli pfds[2].fd
 
 
-static void _nvtsrv_usage(void)
+static void _usage(int rc)
 {
-    printf("Usage:\n" " nvtsrv host:port\n");
-    exit(0);
+    printf(help_text);
+    exit(rc);
 }
 
 static void _tn_cli_close(void)
@@ -127,8 +133,8 @@ int main(int argc, char **argv)
         switch (opt)
         {
         default:               /* '?' */
-            fprintf(stderr, HELP);
-            exit(EXIT_FAILURE);
+            _usage(0);
+            break;
         case 'd':
             debug += 1;
             break;
@@ -144,7 +150,7 @@ int main(int argc, char **argv)
     argc -= optind;
     argv += optind;
     if (argc <= 0)
-        _nvtsrv_usage();
+        _usage(1);
 
     nvt_log_level(quiet, debug);
     nvt_log_dest(NVT_LOG_STDOUT);