serialport.h

#ifndef VN_SERIALPORT_H
#define VN_SERIALPORT_H

#include "vn/int.h"
#include "vn/error.h"
#include "vn/bool.h"
#include "vn/xplat/thread.h"
#include "vn/xplat/criticalsection.h"

#if defined(_WIN32)

    /* Disable some warnings for Visual Studio with -Wall. */
    #if defined(_MSC_VER)
        #pragma warning(push)
        #pragma warning(disable:4668)
        #pragma warning(disable:4820)
        #pragma warning(disable:4255)
    #endif

    #include <Windows.h>

    #if defined(_MSC_VER)
        #pragma warning(pop)
    #endif
#endif

#ifdef __linux__
    #include <linux/serial.h>
#elif defined __APPLE__
    #include <dirent.h>
#endif

#ifdef __cplusplus
extern "C" {
#endif

typedef void (*VnSerialPort_DataReceivedHandler)(void *userData);

#ifdef _WIN32
#pragma warning(push)
#pragma warning(disable : 4820)
#endif

typedef struct
{
    #ifdef _WIN32
    HANDLE handle;
    /* Windows appears to need single-thread access to read/write API functions. */
    VnCriticalSection readWriteCS;
    #elif (defined __linux__ || defined __APPLE__ || defined __CYGWIN__ || defined __QNXNTO__)
    int handle;
    #else
    #error "Unknown System"
    #endif

    bool purgeFirstDataBytesWhenSerialPortIsFirstOpened;

    VnSerialPort_DataReceivedHandler dataReceivedHandler;

    void *dataReceivedHandlerUserData;

    VnThread serialPortNotificationsThread;

    bool continueHandlingSerialPortEvents;

    size_t numberOfReceiveDataDroppedSections;

    VnCriticalSection dataReceivedHandlerCriticalSection;

    char portName[50];

} VnSerialPort;

#ifdef _WIN32
#pragma warning(pop)
#endif

VnError VnSerialPort_initialize(VnSerialPort *serialport);

VnError VnSerialPort_open(VnSerialPort *serialport, char const *portName, uint32_t baudrate);

VnError VnSerialPort_close(VnSerialPort *serialport);

bool VnSerialPort_isOpen(VnSerialPort *serialport);

VnError VnSerialPort_read(VnSerialPort *serialport, char *buffer, size_t numOfBytesToRead, size_t *numOfBytesActuallyRead);

VnError VnSerialPort_write(VnSerialPort *serialport, char const *data, size_t numOfBytesToWrite);

VnError VnSerialPort_changeBaudrate(VnSerialPort *serialport, uint32_t baudrate);

VnError VnSerialPort_registerDataReceivedHandler(VnSerialPort *serialPort, VnSerialPort_DataReceivedHandler handler, void *userData);

VnError VnSerialPort_unregisterDataReceivedHandler(VnSerialPort *serialPort);

#ifdef __cplusplus
}
#endif

#endif