Re: [ros-dev] [ros-diffs] [jgardou] 52339: [NTOSKRNL] - don't rely on a boolean being 1 or 0, it's a bad idea (tm)

[Jérôme Gardou]

I'm not confonding anything, I just consider that calling a function 
which returns a BOOLEAN expecting it will return 0 or 1 is a bad idea, 
because someone might have written the exact same function I've shown 
you as an example.
As a general rule, consider something true when it's not false :-).

Le 19/06/2011 15:29, Alex Ionescu a écrit :
>   This is a completely different issue. You're
> confusing bitmask math
>  with BOOLEAN.
>
>  Best regards,
>  Alex Ionescu
>
>
>
>  2011/6/19 Jérôme Gardou<jerome.gardou(a)laposte.net>et>:
> >   Well, just try this snippet of code in VS 2010,
> > and tell me what you see as
> >  result :-)
> >  BOOLEAN is what it is : a typedef to BYTE.
> >  PS : no fancy optimization option or whatever
> >
> >  // test_boolean.cpp : définit le point d'entrée pour l'application console.
> >  //
> >
> >  #include<iostream>
> >  #include<Windows.h>
> >  #include<tchar.h>
> >
> >  using namespace std;
> >
> >  BOOLEAN test0x10(int i)
> >  {
> >      return i&  0x10;
> >  }
> >
> >
> >  int _tmain(int argc, _TCHAR* argv[])
> >  {
> >      if(test0x10(0x10) == 1)
> >          cout<<  "Alex Ionescu is right"<<  endl;
> >      else if(test0x10(0x10))
> >          cout<<  "Sometimes Alex Ionescu is wrong"<<  endl;
> >      else
> >          cout<<  "Unexpected behaviour!!!"<<  endl;
> >
> >      return 0;
> >  }
> >
> >
> >  Le 18/06/2011 17:22, Alex Ionescu a écrit :
> > >   Or rather
> > >
> > >  1 ? 1 : 0
> > >
> > >  (just as retarded).
> > >
> > >  Of course a BOOLEAN is 0 or 1!!!
> > >
> > >  Best regards,
> > >  Alex Ionescu
> > >
> > >
> > >
> > >  On Sat, Jun 18, 2011 at 4:22 PM, Alex Ionescu&lt;ionucu(a)videotron.ca&gt;    wrote:
> > > >   ???
> > > >
> > > >  This is retarded.
> > > >
> > > >  You're doing
> > > >
> > > >  0 ? 0 : 1
> > > >
> > > >  Best regards,
> > > >  Alex Ionescu
> > > >
> > > >
> > > >
> > > >  On Sat, Jun 18, 2011 at 3:45 PM,&lt;jgardou(a)svn.reactos.org&gt;    wrote:
> > > > > Author: jgardou
> > > > > Date: Sat Jun 18 14:45:08 2011
> > > > > New Revision: 52339
> > > > >
> > > > > URL: http://svn.reactos.org/svn/reactos?rev=52339&view=rev
> > > > > Log:
> > > > > [NTOSKRNL]
> > > > >   - don't rely on a boolean being 1 or 0, it's a bad idea (tm)
> > > > >
> > > > > Modified:
> > > > >     trunk/reactos/ntoskrnl/ke/i386/traphdlr.c
> > > > >
> > > > > Modified: trunk/reactos/ntoskrnl/ke/i386/traphdlr.c
> > > > > URL:
> > > > >
> > > > http://svn.reactos.org/svn/reactos/trunk/reactos/ntoskrnl/ke/i386/traphdlr.…
> > > > >
> > > > > ==============================================================================
> > > > > --- trunk/reactos/ntoskrnl/ke/i386/traphdlr.c [iso-8859-1] (original)
> > > > > +++ trunk/reactos/ntoskrnl/ke/i386/traphdlr.c [iso-8859-1] Sat Jun 18
> > > > > 14:45:08 2011
> > > > > @@ -1510,7 +1510,7 @@
> > > > >
> > > > >      /* Set thread fields */
> > > > >      Thread->TrapFrame = TrapFrame;
> > > > > -    Thread->PreviousMode = KiUserTrap(TrapFrame);
> > > > > +    Thread->PreviousMode = KiUserTrap(TrapFrame) ? UserMode :
> > > > > KernelMode;
> > > > >
> > > > >      /* Enable interrupts */
> > > > >      _enable();
> > > > >
> > > > >
> > > > > 
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