/* isatty() replacement.
- Copyright (C) 2012 Free Software Foundation, Inc.
+ Copyright (C) 2012-2014 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
/* 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"
-#define IsConsoleHandle(h) (((long) (h) & 3) == 3)
+/* Optimized test whether a HANDLE refers to a console.
+ See <http://lists.gnu.org/archive/html/bug-gnulib/2009-08/msg00065.html>. */
+#define IsConsoleHandle(h) (((intptr_t) (h) & 3) == 3)
+
+#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)
{
- /* _isatty (fd) tests whether GetFileType of the handle is FILE_TYPE_CHAR. */
- if (_isatty (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))
{
- HANDLE h = (HANDLE) _get_osfhandle (fd);
- return IsConsoleHandle (h);
+ if (IsConsoleHandle (h))
+ return 1;
}
- else
- return 0;
+ errno = ENOTTY;
+ return 0;
}