utilities.cpp

#include <iostream>
#include <cstring>
#include "globals.h"
using namespace std;


///////////////////////////////////////////////////////////////////////////
//  Auxiliary function implementations
///////////////////////////////////////////////////////////////////////////

int decodeDirection(char dir)
{
    switch (dir)
    {
      case 'u':  return UP;
      case 'd':  return DOWN;
      case 'l':  return LEFT;
      case 'r':  return RIGHT;
    }
    return -1;  // bad argument passed in!
}

///////////////////////////////////////////////////////////////////////////
//  clearScreen implementations
///////////////////////////////////////////////////////////////////////////

// DO NOT MODIFY OR REMOVE ANY CODE BETWEEN HERE AND THE END OF THE FILE!!!
// THE CODE IS SUITABLE FOR VISUAL C++, XCODE, AND g++ UNDER LINUX.

// Note to Xcode users:  clearScreen() will just write a newline instead
// of clearing the window if you launch your program from within Xcode.
// That's acceptable.

#ifdef _MSC_VER  //  Microsoft Visual C++

#include <windows.h>

void clearScreen()
{
    HANDLE hConsole = GetStdHandle(STD_OUTPUT_HANDLE);
    CONSOLE_SCREEN_BUFFER_INFO csbi;
    GetConsoleScreenBufferInfo(hConsole, &csbi);
    DWORD dwConSize = csbi.dwSize.X * csbi.dwSize.Y;
    COORD upperLeft = { 0, 0 };
    DWORD dwCharsWritten;
    FillConsoleOutputCharacter(hConsole, TCHAR(' '), dwConSize, upperLeft,
                                                        &dwCharsWritten);
    SetConsoleCursorPosition(hConsole, upperLeft);
}

#else  // not Microsoft Visual C++, so assume UNIX interface

#include <cstring>
#include <iostream>

void clearScreen()  // will just write a newline in an Xcode output window
{
    static const char* term = getenv("TERM");
    if (term == nullptr  ||  strcmp(term, "dumb") == 0)
        std::cout << std::endl;
    else
    {
        static const char* ESC_SEQ = "\x1B[";  // ANSI Terminal esc seq:  ESC [
        std::cout << ESC_SEQ << "2J" << ESC_SEQ << "H" << std::flush;
    }
}

#endif