static SntpStatus_t receiveSntpResponse()

in source/core_sntp_client.c [560:608]
40 lines of code
4 McCabe index (conditional complexity)

static SntpStatus_t receiveSntpResponse( const UdpTransportInterface_t * pTransportIntf,
                                         uint32_t timeServer,
                                         uint16_t serverPort,
                                         uint8_t * pBuffer,
                                         uint16_t responseSize )
{
    SntpStatus_t status = SntpNoResponseReceived;
    int32_t bytesRead = 0;

    assert( pTransportIntf != NULL );
    assert( pTransportIntf->recvFrom != NULL );
    assert( pBuffer != NULL );
    assert( responseSize >= SNTP_PACKET_BASE_SIZE );

    bytesRead = pTransportIntf->recvFrom( pTransportIntf->pUserContext,
                                          timeServer,
                                          serverPort,
                                          pBuffer,
                                          responseSize );

    /* Negative return code indicates error. */
    if( bytesRead < 0 )
    {
        status = SntpErrorNetworkFailure;
        LogError( ( "Unable to receive server response: Transport receive failed: Code=%ld",
                    ( long int ) bytesRead ) );
    }
    /* If the packet was not available on the network, check whether we can retry. */
    else if( bytesRead == 0 )
    {
        status = SntpNoResponseReceived;
    }

    /* Partial reads are not supported by UDP, which only supports receiving the entire datagram as a whole.
     * Thus, if the transport receive function returns reception of partial data, it will be treated as failure. */
    else if( bytesRead != ( int32_t ) responseSize )
    {
        LogError( ( "Failed to receive server response: Transport recv returned less than expected bytes."
                    "ExpectedBytes=%u, ReadBytes=%ld", responseSize, ( long int ) bytesRead ) );
        status = SntpErrorNetworkFailure;
    }
    else
    {
        LogDebug( ( "Received server response: PacketSize=%ld", ( long int ) bytesRead ) );
        status = SntpSuccess;
    }

    return status;
}