Re: [PATCH 3/4] Make io_stream::exists() directory aware

[Corinna Vinschen <corinna-cygwin at cygwin dot com>]

On Dec 16 22:49, Peter Rosin wrote:
> Den 2010-12-16 20:38 skrev Jon TURNEY:
> > On 29/11/2010 11:28, Corinna Vinschen wrote:
> >> I would prefer if you would use GetFileAttributesA here, just like the
> >> io_stream_file::exists method.  This also unifies testing the
> >> attributes.
> > 
> > Oh, I used _stat() in the !IsWindowsNT() case as MSDN tells me that
> > GetFileAttributes() isn't available prior to Win2K.  I guess I've been misled :-)

Very much.  GetFileAttributes is a function which already existed in
Windows 95.

> That's just MS trying to rewrite history now that Win2k is is the oldest
> supported OS.  According to MSDN, no API predates Win2k.  Stupid if you
> ask me...

Right.  That's very annoying and it's not easy now to find out which API
existed prior to W2K using the MSDN docs.  However, there is one way:

  http://msdn.microsoft.com/en-us/library/aa383687%28v=VS.85%29.aspx

This points to a list of Windows functions as they have been introduced
on a pre-release base.  If you have a function which is documented to
exist since Windows 2000, but which is not in the list of functions
introduced with Windows 2000

  http://msdn.microsoft.com/en-us/library/aa383748%28v=VS.85%29.aspx

then the function already existed since at least Windows NT4 SP4.

Even easier is this:  If it's in the w32api headers and if it's not
bracketed with something like

  #if (_WIN32_WINNT >= 0x0500)

then it's an old function which already existed in 95/98/Me/NT4.


Corinna

-- 
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Project Co-Leader          cygwin AT cygwin DOT com
Red Hat