fix new bug in parsing amqp:// address where the default vhost was incorrectly overwritten

include/address.h

@@ -28,19 +28,19 @@ private:
      *  @var Login
      */
     Login _login;
-    
+
     /**
      *  The hostname
      *  @var std::string
      */
     std::string _hostname;
-    
+
     /**
      *  Port number
      *  @var uint16_t
      */
     uint16_t _port = 5672;
-    
+
     /**
      *  The vhost
      *  @var std::string
@@ -62,47 +62,47 @@ public:
 
         // must start with amqp://
         if (size < 7 || strncmp(data, "amqp://", 7) != 0) throw std::runtime_error("AMQP address should start with \"amqp://\"");
-        
+
         // begin of the string was parsed
         data += 7;
-        
+
         // do we have a '@' to split user-data and hostname?
         const char *at = (const char *)memchr(data, '@', last - data);
-        
+
         // do we have one?
         if (at != nullptr)
         {
             // size of the user:password
             size_t loginsize = at - data;
-            
+
             // colon could split username and password
             const char *colon = (const char *)memchr(data, ':', loginsize);
-            
+
             // assign the login
             _login = Login(
                 std::string(data, colon ? colon - data : loginsize),
                 std::string(colon ? colon + 1 : "", colon ? at - colon - 1 : 0)
             );
-            
+
             // set data to the start of the hostname
             data = at + 1;
         }
-        
+
         // find out where the vhost is set (starts with a slash)
         const char *slash = (const char *)memchr(data, '/', last - data);
-        
+
         // was a vhost set?
-        if (slash != nullptr && last - data > 1) _vhost.assign(slash + 1, last - slash - 1);
+        if (slash != nullptr && last - slash > 1) _vhost.assign(slash + 1, last - slash - 1);
-        
+
         // the hostname is everything until the slash, check is portnumber was set
         const char *colon = (const char *)memchr(data, ':', last - data);
-        
+
         // was a portnumber specified (colon must appear before the slash of the vhost)
         if (colon && (!slash || colon < slash))
         {
             // a portnumber was set to
             _hostname.assign(data, colon - data);
-            
+
             // calculate the port
             _port = atoi(std::string(colon + 1, slash ? slash - colon - 1 : last - colon - 1).data());
         }
@@ -120,7 +120,7 @@ public:
      *  @throws std::runtime_error
      */
     Address(const char *data) : Address(data, strlen(data)) {}
-    
+
     /**
      *  Constructor based on std::string
      *  @param  address
@@ -134,17 +134,17 @@ public:
      *  @param  login
      *  @param  vhost
      */
-    Address(std::string host, uint16_t port, Login login, std::string vhost) : 
+    Address(std::string host, uint16_t port, Login login, std::string vhost) :
         _login(std::move(login)),
         _hostname(std::move(host)),
-        _port(port), 
+        _port(port),
         _vhost(std::move(vhost)) {}
-    
+
     /**
      *  Destructor
      */
     virtual ~Address() = default;
-    
+
     /**
      *  Expose the login data
      *  @return Login
@@ -153,7 +153,7 @@ public:
     {
         return _login;
     }
-    
+
     /**
      *  Host name
      *  @return std::string
@@ -162,7 +162,7 @@ public:
     {
         return _hostname;
     }
-    
+
     /**
      *  Port number
      *  @return uint16_t
@@ -171,7 +171,7 @@ public:
     {
         return _port;
     }
-    
+
     /**
      *  The vhost to connect to
      *  @return std::string
@@ -180,7 +180,7 @@ public:
     {
         return _vhost;
     }
-    
+
     /**
      *  Cast to a string
      *  @return std:string
@@ -189,23 +189,23 @@ public:
     {
         // result object
         std::string str("amqp://");
-        
+
         // append login
         str.append(_login.user()).append(":").append(_login.password()).append("@").append(_hostname);
-        
+
         // do we need a special portnumber?
         if (_port != 5672) str.append(":").append(std::to_string(_port));
-        
+
         // append default vhost
         str.append("/");
-        
+
         // do we have a special vhost?
         if (_vhost != "/") str.append(_vhost);
-        
+
         // done
         return str;
     }
-    
+
     /**
      *  Comparison operator
      *  @param  that
@@ -215,17 +215,17 @@ public:
     {
         // logins must match
         if (_login != that._login) return false;
-        
+
         // hostname must match, but are nt case sensitive
         if (strcasecmp(_hostname.data(), that._hostname.data()) != 0) return false;
-        
+
         // portnumber must match
         if (_port != that._port) return false;
-        
+
         // and finally the vhosts, they must match too
         return _vhost == that._vhost;
     }
-    
+
     /**
      *  Comparison operator
      *  @param  that