/* $Id: nocrt-isatty.cpp 96070 2022-08-05 23:08:39Z vboxsync $ */
/** @file
 * IPRT - No-CRT - isatty().
 */

/*
 * Copyright (C) 2022 Oracle Corporation
 *
 * This file is part of VirtualBox Open Source Edition (OSE), as
 * available from http://www.virtualbox.org. This file is free software;
 * you can redistribute it and/or modify it under the terms of the GNU
 * General Public License (GPL) as published by the Free Software
 * Foundation, in version 2 as it comes in the "COPYING" file of the
 * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
 * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
 *
 * The contents of this file may alternatively be used under the terms
 * of the Common Development and Distribution License Version 1.0
 * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
 * VirtualBox OSE distribution, in which case the provisions of the
 * CDDL are applicable instead of those of the GPL.
 *
 * You may elect to license modified versions of this file under the
 * terms and conditions of either the GPL or the CDDL or both.
 */


/*********************************************************************************************************************************
*   Header Files                                                                                                                 *
*********************************************************************************************************************************/
#define IPRT_NO_CRT_FOR_3RD_PARTY
#include "internal/nocrt.h"
#include <iprt/nocrt/unistd.h>
#include <iprt/nocrt/errno.h>
#include <iprt/errcore.h>

#ifdef RT_OS_WINDOWS
# include <iprt/win/windows.h>
#endif


#undef isatty
int RT_NOCRT(isatty)(int fd) RT_NOEXCEPT
{
#ifdef RT_OS_WINDOWS
    HANDLE hNative = (HANDLE)(uintptr_t)(unsigned)fd;
    DWORD  dwType = GetFileType(hNative);
    if (dwType == FILE_TYPE_CHAR)
        return 1;

    if (dwType != FILE_TYPE_UNKNOWN)
        errno = ENOTTY;
    else
        errno = RTErrConvertToErrno(RTErrConvertFromWin32(GetLastError()));
    return 0;

#else
# error "port me"
#endif
}
RT_ALIAS_AND_EXPORT_NOCRT_SYMBOL(isatty);