Fix lossage due to pathname truncation in calls to MODULE_LoadLibraryExA

Michael Beach michaelb at
Thu Sep 12 11:32:08 CDT 2002

On Friday 13 September 2002 02:29, David Laight wrote:
> > > Argl, why does this code use the buffer size contants instead of
> > > sizeof(variable) !?
> > > I suggest we always specify buffer length constants only *once*,
> > > namely at creation of the buffer.
> > > Not doing so can be potentially very harmful if we decide to change
> > > the buffer length and then manage to forget one or more length
> > > constants...
> >
> > However I don't think saying something like sizeof(bufferW) is a clear
> > winner here, as we're not interested in the size in terms of the number
> > of bytes (or number of items of data of type char to be pedantic) of
> > bufferW, but rather the number of elements in bufferW. To get the number
> > of elements in bufferW we'd have to use sizeof(bufferW) / sizeof(WCHAR),
> > which is a bit long winded, but I suppose could be wrapped by a macro.
> The 'usual' definition is sizeof bufferW / sizeof *bufferW
> sometimes encapsulated in a NELEM (or nelem) macro:
> #define nelem(x) (sizeof (x) / sizeof *(x))

Thanks, I'd totally forgotten about the dereferencing trick to get the size 
of an element!

> Then the constant only appears once.
> Indeed you have to ask whether MAX_PATH is an enforced system restraint
> or just wishful thinking.
> Certainly the NetBSD kernel doesn't enforce it (although some shells
> enforce it (or other arbitrary limits) on the length of $PWD.

I was under the impression that MAX_PATH is a Windows limitation rather than 
one of the UNIX that WINE is running on. Since Windows doesn't promise to 
permit any more than MAX_PATH, we gain nothing by allowing for more in WINE, 
hence the use of MAX_PATH to size the buffers.

But I wonder about the wacky //?/ pathnames that Windows supports, and if 
WINE can cope with them...

> 	David


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