Compile CPW-Engine

[Robert Pope]

I've been trying to compile the CPW-engine in VS 2019. I've cleaned up a lot of error messages about deprecated functions and pointer types, but I have one error left that I can't figure out:

in the input() function (com.cpp), it has the following line:

if (stdin->_cnt > 0) return 1;

This gives the errors:
Severity Code Description Project File Line Suppression State
Error C2039 '_cnt': is not a member of '_iobuf' CPW C:\games\chess\engine\CPW\code\com.cpp 50
Error (active) E0135 class "_iobuf" has no member "_cnt" CPW C:\games\chess\engine\CPW\code\com.cpp 50

Any ideas?

[Joost Buijs]

Since VS2015 _cnt does not exist anymore in the _iobuf struct, Microsoft moved to what they call the Universal CRT.

https://learn.microsoft.com/en-us/cpp/p ... w=msvc-140

In my engine I use _kbhit() to check whether there is input from the console, but you first have to determine if the engine is connected via a pipe or not.

I use this:

Code: Select all

	// stdio
	HANDLE hStdin;
	HANDLE hStdout;
	bool bPipe;

	void InitIO()
	{
		hStdin = GetStdHandle(STD_INPUT_HANDLE);
		hStdout = GetStdHandle(STD_OUTPUT_HANDLE);
		bPipe = (GetFileType(hStdin) == FILE_TYPE_PIPE);
		if (bPipe)
		{
			setvbuf(stdin, NULL, _IONBF, 0);
			setvbuf(stdout, NULL, _IONBF, 0);
		}
		fflush(NULL);
	}

	bool CheckInput()
	{
		if (bPipe)
		{ // anonymous pipe
			DWORD dwAvail = 0;
			if (PeekNamedPipe(hStdin, NULL, 0, NULL, &dwAvail, NULL) && dwAvail > 0) return true;
		}

		// console
		else if (_kbhit()) return true;

		return false;
	}

[Robert Pope]

Thanks, that's very helpful.