Read a Raw Byte with C++ on Linux from Library Port

Projects Programming
1

I'm porting a C++ program from Visual Studio 2010 on Windows to Ubuntu 12.04. It uses this SerialClass.cpp and .h library to connect to the Arduino on Windows:

http://playground.arduino.cc/Interfacing/CPPWindows

I've removed all dependencies on this library except this call to ReadData:

  // read a raw byte
			if (SP->ReadData(incomingData + readResult,1) == 1)
				readResult++;
			else
				continue;

I'm looking for a function, library, or a way to rewrite ReadData to do the same thing in Linux. Any advice? Thanks!

Here's ReadData from Serial.cpp:

    int Serial::ReadData(char *buffer, unsigned int nbChar)
    {
    //Number of bytes we'll have read
    DWORD bytesRead;
    //Number of bytes we'll really ask to read
    unsigned int toRead;

    //Use the ClearCommError function to get status info on the Serial port
    ClearCommError(this->hSerial, &this->errors, &this->status);

    //Check if there is something to read
    if(this->status.cbInQue>0)
    {
        //If there is we check if there is enough data to read the required number
        //of characters, if not we'll read only the available characters to prevent
        //locking of the application.
        if(this->status.cbInQue>nbChar)
        {
            toRead = nbChar;
        }
        else
        {
            toRead = this->status.cbInQue;
        }

        //Try to read the require number of chars, and return the number of read bytes on success
        if(ReadFile(this->hSerial, buffer, toRead, &bytesRead, NULL) && bytesRead != 0)
        {
            return bytesRead;
        }

    }

    //If nothing has been read, or that an error was detected return -1
    return -1;

}
2

Here is the original function in full (Windows):

And here's the one that I've been trying to rewrite for Linux: