/* This is used when the player is moving one of her pieces that is
* already on the board to a new space.
*
* Return true iff the current player can place the piece in board
* position (x,y).
*
* We can move the old piece here if
* 0) Target space is empty,
* AND
* 1a) Moving to an unoccupied neighboring space, OR
* 1b) Moving to an unoccupied space that is one jump over a neighbor
* AND
* 2) The move does not result in disconnected board
* AND
* 3) Target space is still adjacent to an existing piece (could be our own
* piece or an enemy piece, doesn't matter)
*
* Hint: you may want to use checkNbrs, isNeighboringSpace,
* isJumpSpace, and isConnected as subroutines here.
*/
bool canPlaceOldPiece(int x, int y){
//TODO
int target = 20*y+x;
if ((board[target]->type == 0) && (isNeighboringSpace(x,y) || isJumpSpace(x,y)))
if(stillConnected(x,y))
return true;
return false;
}
//*****************************************************************************
//
// Method: me_write
//
// Purpose:
//
// This method writes a number of bytes to the communications channel.
//
// Returns:
//
// > 0 - write succeeded
// -1 - write failed
//
// Arguments:
//
// I const char *buffer - buffer to write
// I int length - number of bytes to write
//
// History:
//
// Date Author Reason
// ==== ====== ======
//
// 27/11/97 Geoff Glasson Original version
//
//*****************************************************************************
int TcpSocket::write ( const char * pBuffer, // Buffer to write
const int pLength ) // Number of bytes to write
{
//
// Write the buffer to the socket.
//
try
{
//
// If the socket is not connected then we can't really write to
// it.
//
if( false == stillConnected() )
{
//throw exception
std::ostringstream streamErrInfo;
std::string strErrorInfo;
streamErrInfo << "Not connected";
strErrorInfo = streamErrInfo.str();
throw std::exception(strErrorInfo.c_str());
}
_LOG(SourceFLInfo, DebugDebug, "Attempting to write %d bytes to socket", pLength );
//
// Write the data to the stream. Under UNIX we will retry if there is a
// write already in progream.
//
const char * lvPacket;
const int lvMaxPacketLength = 1024;
int lvPacketLength;
int lvProgressing = 1;
int lvTransferredBytes = 0;
lvPacket = pBuffer;
int lvNumberOfBytesWritten = 0;
do
{
//
// Determine the amount of data to be transferred. The maximum packet
// size is defined by lv_max_packet_length.
//
lvPacketLength = ( pBuffer + pLength) - lvPacket;
if ( lvMaxPacketLength < lvPacketLength )
{
lvPacketLength = lvMaxPacketLength;
}
#if !defined( WIN32 )
LOG (SourceInfo, TA_Base_Core::DebugUtil::GenericLog,
TA_Base_Core::DebugUtil::DebugDebug,
"About to write %d bytes to socket", lvPacketLength );
lvNumberOfBytesWritten = ::write( socketId, lvPacket, lvPacketLength );
int lvErrno = errno;
if ( -1 == lvNumberOfBytesWritten )
{
LOG (SourceInfo, TA_Base_Core::DebugUtil::GenericLog,
TA_Base_Core::DebugUtil::DebugWarn,
"Failed to write to socket: %s", strerror( lvErrno ) );
//
// If a write is in progress, sleep for 0.1 second2.
//
struct timespec lvSleepTime = { 0,
#if defined( SOLARIS )
( unsigned long )( 0.1 * NANOSEC )
#else // !defined( SOLARIS )
( unsigned long )( 0.1 * 1000000000 )
#endif // !defined( SOLARIS );
};
nanosleep( & lvSleepTime, NULL );
}
#else // defined( WIN32 )
//lvNumberOfBytesWritten = ::send( socketId, pBuffer, pLength, 0 );
lvNumberOfBytesWritten = ::send( socketId, lvPacket, lvPacketLength, 0 );
int lvErrno = 0;
if ( SOCKET_ERROR == lvNumberOfBytesWritten )
{
lvErrno = WSAGetLastError();
if ( WSAEALREADY == lvErrno )
{
_LOG(SourceFLInfo, DebugDebug, "Write in progress => waiting 1 millisecond before trying again");
//
// If a write is in progress, sleep for one millisecond then
// try again.
//
Sleep( 1 );
}
}
#endif // WIN32
else
{
if ( 0 != lvNumberOfBytesWritten )
{
lvTransferredBytes += lvNumberOfBytesWritten;
}
else
{
_LOG(SourceFLInfo, DebugDebug, "Wrote %d bytes to the socket", lvNumberOfBytesWritten);
}
if ( lvPacketLength == lvNumberOfBytesWritten )
{
lvPacket += lvMaxPacketLength;
}
}
//
// Determine if the transfer is progressing.
//
lvProgressing = 1;
if ( ( EBADF == lvErrno ) ||
( ENXIO == lvErrno ) ||
( EPIPE == lvErrno ) ||
( lvPacket > & pBuffer[ pLength - 1 ] ) )
{
lvProgressing = 0;
}
#ifndef WIN32
if ( ( ECONNRESET == lvErrno ) ||
( ENOTCONN == lvErrno ) ||
( ECONNABORTED == lvErrno ) )
#else // !WIN32
if ( ( WSAECONNRESET == lvErrno ) ||
( WSAENOTCONN == lvErrno ) ||
( WSAECONNABORTED == lvErrno ) )
#endif // WIN32
{
m_isDisconnected = true;
lvProgressing = 0;
}
} while ( 0 != lvProgressing );
return lvTransferredBytes;
}
//
// Deal with MS Visual C++ exceptions.
//
catch ( const unsigned int )
{
//throw exception
std::ostringstream streamErrInfo;
std::string strErrorInfo;
streamErrInfo << "Unknown Microsoft exception caught";
strErrorInfo = streamErrInfo.str();
throw std::exception(strErrorInfo.c_str());
}
}
//*****************************************************************************
//
// Method: me_read
//
// Purpose:
//
// This method reads a number of bytes from the channel. It returns the
// number of bytes read from the channel. The method determines if the
// client is still connected, and throws an exception if it is not. The
// checking works as follows:
//
// If there is a socket ready for reading and there is no data to be read,
// then the socket may not be connected. After COMMS_CHECK_TIME seconds,
// the client is "pinged" and if there is no response, the client is
// assumed to have disconnected. In this case, an exception is thrown. If
// a response is received, the method waits for another COMMS_CHECK_TIME
// seconds before checking the connection status again.
//
// Returns:
//
// 0 - read succeeded
// non-0 - read failed
//
// Arguments:
//
// O char *buffer - buffer to read into
// O unsigned int *length - number of bytes read
// I unsigned int max_length - maximum length of the buffer
//
// History:
//
// Date Author Reason
// ==== ====== ======
//
// 19/08/98 Geoff Glasson Channel now detects when the remote connection
// is closed unexpectedly and throws an
// CHANNEL_EX_COMMS_LOST exception.
//
// 12/01/97 Geoff Glasson Added code to determine if the connection to the
// client is down. It throws an exception so that
// higher level routines can figure out what to do.
//
// 27/11/97 Geoff Glasson Original version
//
//*****************************************************************************
int TcpSocket::read ( char *pBuffer, // Buffer to read into
unsigned int *pLength, // Number of bytes read
const unsigned int pMaxLength) // Maximum length of the buffer
{
//
// Do some validation.
//
//TA_DEBUG_ASSERT( 0 != pBuffer, "NULL pointer passed for read buffer" );
//TA_DEBUG_ASSERT( 0 != pLength , "Zero length read requested" );
//TA_DEBUG_ASSERT( 0 < pMaxLength , "Buffer length is zero or less" );
try
{
//
// If the socket is not connected then we can't really read from
// it.
//
if( false == stillConnected() )
{
pBuffer[ 0 ] = '\0';
*pLength = 0;
std::ostringstream streamErrInfo;
std::string strErrorInfo;
streamErrInfo << "Not connected";
strErrorInfo = streamErrInfo.str();
throw std::exception(strErrorInfo.c_str());
}
//
// Read max_length bytes from the socket.
//
*pLength = 0;
fd_set lvIdset;
FD_ZERO( & lvIdset);
FD_SET( socketId, & lvIdset );
#if !defined( WIN32 )
const int lvNumReady = select( FD_SETSIZE, & lvIdset, ( fd_set * )0,
( fd_set * )0, & m_readingTimeout );
#else
//xinsong ++
//it seems that the timeout does not work properly when running in win32
const int lvNumReady = select( FD_SETSIZE, & lvIdset, ( fd_set * )0,
( fd_set * )0, NULL );
#endif
_LOG(SourceFLInfo, DebugInfo, "Number of ready sockets: %d", lvNumReady );
// For Blocking sockets, select is in error if <=0
// For NonBlocking sockets, select is in error if <0
if ( (isBlocking && lvNumReady <= 0) ||
(!isBlocking && lvNumReady < 0) )
{
#if !defined( WIN32 )
const int lvErrno = errno;
#else // defined( WIN32 )
const int lvErrno = WSAGetLastError();
#endif // defined( WIN32 )
if ( EINTR == lvErrno )
{
_LOG(SourceFLInfo, DebugInfo, "Interrupted system call" );
return 0;
}
std::string lvMessage = "Unable to read from socket - ";
#if !defined( WIN32 )
lvMessage.append( strerror( errno ) );
#else // defined( WIN32 )
LPVOID lpMsgBuf;
FormatMessage( FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM |
FORMAT_MESSAGE_IGNORE_INSERTS, NULL, WSAGetLastError(),
MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), // Default language
(LPTSTR) &lpMsgBuf,
0,
NULL );
lvMessage.append( ( char * )lpMsgBuf );
LocalFree( lpMsgBuf );
#endif // defined( WIN32 )
m_isDisconnected = true;
//throw exception
std::ostringstream streamErrInfo;
std::string strErrorInfo;
streamErrInfo << lvMessage;
strErrorInfo = streamErrInfo.str();
throw std::exception(strErrorInfo.c_str());
}
if ( lvNumReady != 0 )
{
if ( false == FD_ISSET( socketId, & lvIdset ) )
{
#if !defined( WIN32 )
if ( ECONNRESET == errno ||
ENOTCONN == errno )
#else // defined( WIN32 )
if ( WSAECONNRESET == WSAGetLastError() ||
WSAENOTCONN == WSAGetLastError() )
#endif // defined( WIN32 )
{
m_isDisconnected = true;
//throw exception
std::ostringstream streamErrInfo;
std::string strErrorInfo;
streamErrInfo << "Connection closed unexpectedly";
strErrorInfo = streamErrInfo.str();
throw std::exception(strErrorInfo.c_str());
}
else
{
#if !defined( WIN32 )
return errno;
#else // defined( WIN32 )
return WSAGetLastError();
#endif // defined( WIN32 )
}
}
#if !defined( WIN32 )
const int lvStatus = ::read( socketId, ( void * )pBuffer, pMaxLength );
#else // defined( WIN32 )
const int lvStatus = recv( socketId, pBuffer, pMaxLength, 0 );
#endif // defined( WIN32 )
if( 0 <= lvStatus )
{
* pLength = lvStatus;
pBuffer[ * pLength ] = '\0';
_LOG(SourceFLInfo, DebugDebug, "Read %d bytes from socket", lvStatus );
}
else
{
_LOG(SourceFLInfo, DebugDebug, "No data returned from socket" );
}
}
}
//
// Handle Windows exceptions.
//
catch ( const unsigned int )
{
//throw exception
std::ostringstream streamErrInfo;
std::string strErrorInfo;
streamErrInfo << "Unexpected Microsoft exception caught";
strErrorInfo = streamErrInfo.str();
throw std::exception(strErrorInfo.c_str());
}
//
// Done.
//
return (0);
}
