argc and argv may be zero (which means to ignore them)

libvncclient/vncviewer.c

@@ -188,6 +188,11 @@ static rfbBool rfbInitConnection(rfbClient* client)
 rfbBool rfbInitClient(rfbClient* client,int* argc,char** argv) {
   int i,j;
 
+  if(argv==0 || argc==0 || *argc==0) {
+    client->programName="";
+    client->serverHost="";
+    client->serverPort=5900;
+  } else {
     if(client->programName==0)
       client->programName=argv[0];
 
@@ -222,6 +227,7 @@ rfbBool rfbInitClient(rfbClient* client,int* argc,char** argv) {
 	i--;
       }
     }
+  }
 
   if(!rfbInitConnection(client)) {
     rfbClientCleanup(client);