From ccc0c4a65f712218c7b7160a5170ce1011c34234 Mon Sep 17 00:00:00 2001
From: Lucas Betschart <lucasbetschart@gmail.com>
Date: Thu, 28 Dec 2017 23:22:04 +0100
Subject: [PATCH] Fix --help and -? options Stop on invalid options Fixes 52
 and 53

---
 main.cpp | 15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)

diff --git a/main.cpp b/main.cpp
index 9ef50628..346e18ab 100644
--- a/main.cpp
+++ b/main.cpp
@@ -74,28 +74,28 @@ class CDnsSeedOpts {
         {"testnet", no_argument, &fUseTestNet, 1},
         {"wipeban", no_argument, &fWipeBan, 1},
         {"wipeignore", no_argument, &fWipeBan, 1},
-        {"help", no_argument, 0, 'h'},
+        {"help", no_argument, 0, '?'},
         {0, 0, 0, 0}
       };
       int option_index = 0;
-      int c = getopt_long(argc, argv, "h:n:m:t:a:p:d:o:i:k:w:", long_options, &option_index);
+      int c = getopt_long(argc, argv, "h:n:m:t:a:p:d:o:i:k:w:?", long_options, &option_index);
       if (c == -1) break;
       switch (c) {
         case 'h': {
           host = optarg;
           break;
         }
-        
+
         case 'm': {
           mbox = optarg;
           break;
         }
-        
+
         case 'n': {
           ns = optarg;
           break;
         }
-        
+
         case 't': {
           int n = strtol(optarg, NULL, 10);
           if (n > 0 && n < 1000) nThreads = n;
@@ -174,7 +174,10 @@ class CDnsSeedOpts {
         filter_whitelist.insert(NODE_NETWORK_LIMITED | NODE_WITNESS | NODE_BLOOM); // x40c
     }
     if (host != NULL && ns == NULL) showHelp = true;
-    if (showHelp) fprintf(stderr, help, argv[0]);
+    if (showHelp) {
+      fprintf(stderr, help, argv[0]);
+      exit(0);
+    }
   }
 };