Fix the rs232 receive function

[GoogleCodeExporter]

With the current rs232 receive function, I experimented some buffer
synchronization problems during the pn532C106 support implementation
process (see: http://code.google.com/p/libnfc/issues/detail?id=15).

With my patch (Linux only), the function reads exactly the number of bytes
currently in the buffer:



bool rs232_receive(const serial_port sp, byte_t* pbtRx, uint32_t* puiRxLen)
{
  int iResult;
  int byteCount;
  fd_set rfds;

  // Reset file descriptor
  FD_ZERO(&rfds);
  FD_SET(((serial_port_unix*)sp)->fd,&rfds);
  iResult = select(((serial_port_unix*)sp)->fd+1, &rfds, NULL, NULL, &tv);

  // Read error
  if (iResult < 0) return false;

  // Number of bytes in the input buffer
  ioctl(((serial_port_unix*)sp)->fd, FIONREAD, &byteCount);

  // Read time-out or empty buffer
  if (iResult == 0 || byteCount == 0) return false;

  // There is something available, read the data
  *puiRxLen = read(((serial_port_unix*)sp)->fd,pbtRx,byteCount);

  return (*puiRxLen > 0);
}

Original issue reported on code.google.com by emanuele.bertoldi on 4 Sep 2009 at 10:25

[GoogleCodeExporter]

Thanks for report.

Original comment by romu...@libnfc.org on 4 Sep 2009 at 1:34

• Changed title: Fix the rs232 receive function
• Changed state: Started
• Added labels: OpSys-Linux

[GoogleCodeExporter]

Applied in r96. Thanks!

Original comment by romu...@libnfc.org on 4 Sep 2009 at 1:48

[GoogleCodeExporter]

Original comment by romu...@libnfc.org on 4 Sep 2009 at 1:48

• Changed state: Fixed