bt-win.c

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#include <stdlib.h>
#include <errno.h>

#include <windows.h>

#include "defs.h"

#define BT "COM1"

void *bt_open(const char *device , const char* unused)
{
    (void) unused;
    HANDLE handle = CreateFileA(device ?: BT, GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, 0, NULL);
    return handle != INVALID_HANDLE_VALUE ? handle : NULL;
}

int bt_write(void* handle, const u8* buf, size_t count)
{
    DWORD dwBytesWritten;
    
    buf++;count--; // omit HID report number
    if (!WriteFile(handle, buf, count, &dwBytesWritten, NULL))
        return -1;
    
    return dwBytesWritten;
}

int bt_read(void *handle, u8* buf, size_t count, int milliseconds)
{
    (void) milliseconds; // https://msdn.microsoft.com/en-us/library/windows/desktop/aa363190%28v=vs.85%29.aspx
    DWORD dwBytesRead;
    if (!ReadFile(handle, buf, count, &dwBytesRead, NULL))
        return -1;
    return dwBytesRead;
}
void bt_close(void *handle)
{
    CloseHandle(handle);
}

const wchar_t *bt_error(void* fd_) { 
    (void)fd_;
    wchar_t **buf = NULL; 
    FormatMessageW( FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM,
    NULL, GetLastError(), 0, (wchar_t*)&buf, 0, NULL); //leaks

    return buf ? *buf : L"Error in printing error";
}