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/* isatty() replacement.
Copyright (C) 2012-2016 Free Software Foundation, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include <config.h>
/* Specification. */
#include <unistd.h>
/* This replacement is enabled on native Windows. */
#include <errno.h>
/* Get declarations of the Win32 API functions. */
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include "msvc-inval.h"
/* Get _get_osfhandle(). */
#include "msvc-nothrow.h"
static BOOL IsConsoleHandle (HANDLE h)
{
DWORD mode;
return GetConsoleMode (h, &mode) != 0;
}
#if HAVE_MSVC_INVALID_PARAMETER_HANDLER
static int
_isatty_nothrow (int fd)
{
int result;
TRY_MSVC_INVAL
{
result = _isatty (fd);
}
CATCH_MSVC_INVAL
{
result = 0;
}
DONE_MSVC_INVAL;
return result;
}
#else
# define _isatty_nothrow _isatty
#endif
/* Determine whether FD refers to a console device. Return 1 if yes.
Return 0 and set errno if no. (ptsname_r relies on the errno value.) */
int
isatty (int fd)
{
HANDLE h = (HANDLE) _get_osfhandle (fd);
if (h == INVALID_HANDLE_VALUE)
{
errno = EBADF;
return 0;
}
/* _isatty (fd) tests whether GetFileType of the handle is FILE_TYPE_CHAR.
But it does not set errno when it returns 0. */
if (_isatty_nothrow (fd))
{
if (IsConsoleHandle (h))
return 1;
}
errno = ENOTTY;
return 0;
}
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