MZ_FillPSP() in dlls/winedos/module.c

Chris Morgan cmorgan at
Wed Sep 25 19:59:29 CDT 2002

On Wednesday 25 September 2002 06:13 pm, Francois Gouget wrote:
> On Wed, 25 Sep 2002, Ove Kaaven wrote:
> > On Tue, 24 Sep 2002 chrismorgan at wrote:
> [...]
> > > I have a script that passes a long argument string when calling a
> > > command handler( or other comspec replacement).
> [...]
> > > is breaking my application by truncating the 200+ character argument
> > > at 126 characters.  Do we still need to truncate at 126?
> >
> > Yes, it's an intrinsic DOS limitation from the early DOS days.
> [...]
> > This is only a guess, though, I don't know to what extent something like
> > this is supported by DOS or Windows itself, nor what protocol they really
> > use.
> Note that this limitation should only be in effect when calling Dos
> applications. Win32 console applications can receive command lines of up
> to 32KB on NT and any size on Win9x. So maybe the problem is that you
> are using as the COMSPEC. Does this happen with wcmd.exe (or
> the native cmd.exe)?

I haven't tested this with wcmd.exe.  I'm also not using as my 
comspec, I'm using 4nt, a replacement.  The real question is how 
to know if the version of dos is old enough to limit the command line to 126 
characters in this case.  I would argue that we can go to the full 256 
characters at this point.  I'm not sure how support of 32kb+ long command 
lines would be implemented or if many apps even use such long command lines.  


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