PVS-Studio analyzer RunUO check

Introduction

Pieces of code that caught attention when examining the analyzer report

public static string Intern( string str )
{
  if ( str == null )
    return null;
  else if ( str.Length == 0 )
    return String.Empty;

  return String.Intern( str );
}

public BasePaintedMask( string staffer, int itemid )
                            : base( itemid + Utility.Random( 2 ) )
{
  m_Staffer = staffer;

  Utility.Intern( m_Staffer );
}

public static bool IsBuggable( Item item )
{
  if ( item is Fists )
    return false;

  if ( item is ICommodity || item is Multis.BaseBoat
    || item is Fish || item is BigFish
    || item is BasePotion || item is Food || item is CookableFood
    || item is SpecialFishingNet || item is BaseMagicFish
    || item is Shoes || item is Sandals
    || item is Boots || item is ThighBoots
    || item is TreasureMap || item is MessageInABottle
    || item is BaseArmor || item is BaseWeapon
    || item is BaseClothing
    || ( item is BaseJewel && Core.AOS )
    || ( item is BasePotion && Core.ML )
  {
    ....
  }
}

if (item is BasePotion || ( item is BasePotion && Core.ML ))

public virtual double GetFightModeRanking( Mobile m,
                                           FightMode acqType,
                                           bool bPlayerOnly )
{
  if ( ( bPlayerOnly && m.Player ) ||  !bPlayerOnly )
  {
    ....
  }
  ....
}

if ( m.Player || !bPlayerOnly )

public int ComputePriceFor( HouseDeed deed )
{
  int price = 0;

  if ( deed is SmallBrickHouseDeed ||    // <=
       deed is StonePlasterHouseDeed ||
       deed is FieldStoneHouseDeed ||
       deed is SmallBrickHouseDeed ||    // <=
       deed is WoodHouseDeed ||
       deed is WoodPlasterHouseDeed ||
       deed is ThatchedRoofCottageDeed )
      ....
}

private void SetLockdown( Item i, bool locked, bool checkContains )
{
  if ( m_LockDowns == null )
    return;

  #region Mondain's Legacy
  if ( i is BaseAddonContainer )
    i.Movable = false;
  else
  #endregion

  i.Movable = !locked;
  i.IsLockedDown = locked;

  ....
}

i.Movable = !locked;

public override void OnCast()
{
  if ( Core.AOS )
  {
    damage = m.Hits / 2;

    if ( !m.Player )
      damage = Math.Max( Math.Min( damage, 100 ), 15 );
      damage += Utility.RandomMinMax( 0, 15 );            // <=

  }
  else
  {
    ....
  }
}

public static void InvokeServerStarted()
{
  if ( ServerStarted != null )
    ServerStarted();
}

public static void InvokeServerStarted()
{
  ServerStarted?.Invoke();
}

private Packet m_RemovePacket;
....
private object _rpl = new object();
public Packet RemovePacket
{
  get
  {
    if (m_RemovePacket == null)
    {
      lock (_rpl)
      {
        if (m_RemovePacket == null)
        {
          m_RemovePacket = new RemoveItem(this);
          m_RemovePacket.SetStatic();
        }
      }
    }

    return m_RemovePacket;
  }
}

lock (_rpl)
{
  if (m_RemovePacket == null)
  {
    Packet instance = new RemoveItem(this);
    instance.SetStatic();
    m_RemovePacket = instance;
  }
}

private volatile Packet m_RemovePacket;
....
private object _rpl = new object();
public Packet RemovePacket
{
  get
  {
    if (m_RemovePacket == null)
    {
      lock (_rpl)
      {
        if (m_RemovePacket == null)
        {
          Packet instance = new RemoveItem(this);
          instance.SetStatic();
          m_RemovePacket = instance;
        }
      }
    }

    return m_RemovePacket;
  }
}

private Lazy<Packet> m_RemovePacket = new Lazy<Packet>(() =>
  {
    Packet instance = new RemoveItem(this);
    instance.SetStatic();
    return instance;
  }, LazyThreadSafetyMode.ExecutionAndPublication);

....
public Packet RemovePacket
{
  get
  {
    return m_RemovePacket.Value;
  }
}

protected override void OnTarget( Mobile from, object targeted )
{
  ....
  else if ( m_System is Lumberjacking &&
            targeted is IAxe && m_Tool is BaseAxe )
  {
    IAxe obj = (IAxe)targeted;
    Item item = (Item)targeted;
    ....
  }
  ....
}

public struct Serial : IComparable, IComparable<Serial>
{
  private int m_Serial;

  private static Serial m_LastMobile = Zero;                // <=
  private static Serial m_LastItem = 0x40000000;

  public static Serial LastMobile { .... }
  public static Serial LastItem { .... }

  public static readonly Serial MinusOne = new Serial( -1 );
  public static readonly Serial Zero = new Serial( 0 );     // <=
  ....
  private Serial( int serial )
  {
    m_Serial = serial;
  }
  ....
}

public bool IsItem
{
  get
  {
    return ( m_Serial >= 0x40000000 && m_Serial <= 0x7FFFFFFF );
  }
}

public override void WriteDeltaTime( DateTime value )
{
  ....
  try 
  { 
    d = new TimeSpan( ticks-now ); 
  }
  catch 
  {
    if( ticks < now ) 
      d = TimeSpan.MaxValue; 
    else 
      d = TimeSpan.MaxValue;
  }
  ....
}

public virtual void Serialize( GenericWriter writer )
{
  ....
  
  if( ticks < now ) 
    d = TimeSpan.MaxValue; 
  else 
    d = TimeSpan.MaxValue;
  
  ....
}

public override void WriteDeltaTime( DateTime value )
{
  ....
  
  if( ticks < now ) 
    d = TimeSpan.MaxValue; 
  else 
    d = TimeSpan.MaxValue;
  
  ....
}

public Item Talisman
{
  get
  {
    return FindItemOnLayer( Layer.Talisman ) as Item;
  }
}
public Item FindItemOnLayer( Layer layer )
{
  ....
}

public static string ConstructFromString( .... )
{
  object toSet;
  bool isSerial = IsSerial( type );

  if ( isSerial ) // mutate into int32
    type = m_NumericTypes[4];

  ....
  else if ( value == null )
  {
    toSet = null;
  }
  ....

  if ( isSerial ) // mutate back
    toSet = (Serial)((Int32)toSet);

  constructed = toSet;
  return null;
}

toSet = (Serial)((Int32)(toSet ?? 0));

public override void OnResponse(Server.Network.NetState sender, RelayInfo info)
{
  ....
  if ( (pack == null) ||
       ((pack != null) &&
        (!pack.CheckHold(
                m_From,
                item,
                true,
                true,
                0,
                item.PileWeight + item.TotalWeight)) ) )
  {
    pv.SayTo(m_From, 503204);
    m_From.SendGump(new BOBGump(m_From, m_Book, m_Page, null));
  }
  ....
}

if ((pack == null) || ((pack != null) && (!pack.CheckHold(....))))

if (pack == null || !pack.CheckHold(....))

private void Finish_Callback()
{
  ....
  CTFTeamInfo winner = ( teams.Count > 0 ? teams[0] : null );

  .... 

  m_Context.Finish( m_Context.Participants[winner.TeamID] as Participant );
}

public static void Gain( Mobile from, Skill skill ) 
{
  ....
  if ( from.Player && 
     ( skills.Total / skills.Cap ) >= Utility.RandomDouble())
  ....
}

private static Type typeofObject = typeof( object );
....
private class GroupComparer : IComparer
{
  ....
  private static Type typeofObject = typeof( Object );
  ....
}

private bool m_IsRewardItem;

[CommandProperty( AccessLevel.GameMaster )]
public bool IsRewardItem
{
  get{ return m_IsRewardItem; }
  set{ m_IsRewardItem = value; InvalidateProperties(); }
}

private bool m_East;

[CommandProperty( AccessLevel.GameMaster )]
public bool East
{
  get{ return m_East; }
  set{ m_IsRewardItem = value; InvalidateProperties(); }
}

private void SetChestAppearance()
{
  bool UseFirstItemId = Utility.RandomBool();

  switch( Utility.RandomList( 0, 1, 2, 3, 4, 5, 6, 7 ) )
  {
    ....
    case 6:// Keg
      this.ItemID = ( UseFirstItemId ? 0xe7f : 0xe7f );
      this.GumpID = 0x3e;
      break;

    case 7:// Barrel
      this.ItemID = ( UseFirstItemId ? 0xe77 : 0xe77 );
      this.GumpID = 0x3e;
      break;
  }
}

public virtual int AbsorbDamageAOS( Mobile attacker,
                                    Mobile defender,
                                    int damage )
{
  ....
  if ( weapon != null )
  {
    defender.FixedParticles(0x3779,
                            1,
                            15,
                            0x158B,
                            0x0,
                            0x3,
                            EffectLayer.Waist);
    weapon.OnSwing( defender, attacker );
  }
  ....
}

public virtual TimeSpan OnSwing( Mobile attacker, Mobile defender )
{
  return OnSwing( attacker, defender, 1.0 );
}

public static bool IsFixture( int itemID )
{
  ....
  else if( itemID >= 0x319C && itemID < 0x31B0 ) 
    return true;
  // ML doors
  else if( itemID == 0x2D46 ||
           itemID == 0x2D48 ||
           itemID == 0x2FE2 ||
           itemID == 0x2FE4 )
    return true;
  else if( itemID >= 0x2D63 && itemID < 0x2D70 )
    return true;
  else if( itemID >= 0x319C && itemID < 0x31AF ) 
    return true;
  ....
}

Conclusion