Function openSerial() changes the portname parameter

[johnvermaas]

The function openSerial() changes the portname parameter at the end were fd is established:

if (com.hComm == INVALID_HANDLE_VALUE) return -1;
strncpy(portname, portname + 3, 1);
com.fd = atoi(portname); //COMx
SerialParams.DCBlength = sizeof(SerialParams);
return com.fd;

This can easily be fixed as follows:

if (com.hComm == INVALID_HANDLE_VALUE) return -1;
com.fd = atoi(portname + 3);							// COMx and COMxx
SerialParams.DCBlength = sizeof(SerialParams);
return com.fd;

There is a type at the beginning as well:

//COMx
else {
	com.port = calloc(1, sizeof(char) * 5));
}

There is one bracket to many on right side. It should be:

//COMx
else {
	com.port = calloc(1, sizeof(char) * 5);

Sending appears to be working correctly, but I have trouble receiving data.
Is there something where i can define a receive buffer size?