Improve value checking on native code

Author: danielga

source/main.hpp

@@ -6,6 +6,7 @@
 #include <string>
 #include <GarrysMod/FactoryLoader.hpp>
 #include <Platform.hpp>
+#include <limits>
 
 class IVEngineServer;
 class IVEngineClient;
@@ -42,4 +43,26 @@ namespace global
 	LUA_FUNCTION_DECLARE( GetTable );
 
 	void CheckType( GarrysMod::Lua::ILuaBase *LUA, int32_t index, int32_t type, const char *nametype );
+
+	template<typename NumericType>
+	inline NumericType GetNumber( GarrysMod::Lua::ILuaBase *LUA, int32_t idx,
+		NumericType min = std::numeric_limits<NumericType>::min( ),
+		NumericType max = std::numeric_limits<NumericType>::max( ) )
+	{
+		double number = LUA->CheckNumber( idx );
+		if( number < static_cast<double>( min ) )
+		{
+			auto extra = LUA->PushFormattedString( "number %f is less than minimum limit of %f",
+				number, static_cast<double>( min ) );
+			LUA->ArgError( idx, extra );
+		}
+		else if( number > static_cast<double>( max ) )
+		{
+			auto extra = LUA->PushFormattedString( "number %f is greater than maximum limit of %f",
+				number, static_cast<double>( min ) );
+			LUA->ArgError( idx, extra );
+		}
+
+		return static_cast<NumericType>( number );
+	}
 }

source/netmessage.cpp

@@ -481,7 +481,12 @@ namespace NetMessage
 	{
 		GarrysMod::Lua::ILuaBase *LUA = L->luabase;
 		LUA->SetState( L );
-		Push( LUA, new( std::nothrow ) NetMessage );
+		CNetChan *netchan = NetChannel::Get( LUA, 1 );
+		NetMessage *msg = new( std::nothrow ) NetMessage;
+		if( msg != nullptr )
+			msg->SetNetChannel( netchan );
+
+		Push( LUA, new( std::nothrow ) NetMessage, netchan );
 		return 1;
 	}