Re: [ros-dev] [ros-diffs] [hbelusca] 64747: [NTVDM]: Zero-fill memory with RtlZeroMemory (that exists also in NT mode), and use sizeof(object) instead of sizeof(type_of_object).

[Alex Ionescu]

Some people use &array[0] to clarify.

Best regards,
Alex Ionescu

On Thu, Oct 16, 2014 at 3:34 AM, Hermès BÉLUSCA - MAÏTO <
hermes.belusca(a)sfr.fr&gt; wrote:

>   As someone always says: "Read the source,
> Luke" :)
>
>  Those things are arrays!!!!!!!!!!!!!!!!!
>
>  (dos.c)
>  static CHAR CurrentDirectories[NUM_DRIVES][DOS_DIR_LENGTH];
>  ...
>  RtlZeroMemory(CurrentDirectories, sizeof(CurrentDirectories));
>
>  (vga.c)
>  static BYTE VgaMemory[VGA_NUM_BANKS * VGA_BANK_SIZE];
>  ...
>  RtlZeroMemory(VgaMemory, sizeof(VgaMemory));
>
>  For me it seems valid C that zeroes out the full array. Otherwise you could
>  say that those:
>
>  http://git.reactos.org/?p=reactos.git;a=blob;f=reactos/boot/freeldr/freeldr/
>  arch/i386/custom.c;hb=0d14bbad2f3554f40979f97fd4d3efc46c20f03c#l87
>  (and more generally, grep for "ZeroMemory")
>  are bugs, too? :PPP
>
>  H.
>
>  -----Message d'origine-----
>  De : Ros-dev [mailto:[e-mail]] De la part de Jérôme
>  Gardou
>  Envoyé : jeudi 16 octobre 2014 12:19
>  À : ReactOS Development List
>  Objet : Re: [ros-dev] [ros-diffs] [hbelusca] 64747: [NTVDM]: Zero-fill
>  memory with RtlZeroMemory (that exists also in NT mode), and use
>  sizeof(object) instead of sizeof(type_of_object).
>
>  RtlZeroMemory(ptr, sizeof(ptr)) is almost always a bug ;-)
>
>  Le 16/10/2014 12:19, Hermès BÉLUSCA - MAÏTO a écrit :
> >   De : Ros-dev [mailto:[e-mail]]
> > De la part de Timo
> >  Kreuzer Envoyé : mercredi 15 octobre 2014 21:11 À :
> >  ros-dev(a)reactos.org Objet : Re: [ros-dev] [ros-diffs] [hbelusca]
> >  64747: [NTVDM]: Zero-fill memory with RtlZeroMemory (that exists also
> >  in NT mode), and use
> >  sizeof(object) instead of sizeof(type_of_object).
> >
> >
> > >   Looks like bugs 
> >  Can you develop your
> > point?
> >
> >
> >
> >
> >
> >  Am 15.10.2014 00:46, schrieb hbelusca(a)svn.reactos.org:
> > >   Author: hbelusca
> > >  Date: Tue Oct 14 22:46:40 2014
> > >  New Revision: 64747
> > >
> > >  URL: http://svn.reactos.org/svn/reactos?rev=64747&view=rev
> > >  Log:
> > >  [NTVDM]: Zero-fill memory with RtlZeroMemory (that exists also in NT 
> >  mode), and
> > use sizeof(object) instead of sizeof(type_of_object).
> >
> > >          /* Clear the current directory buffer */
> > >  -    ZeroMemory(CurrentDirectories, sizeof(CurrentDirectories));
> > >  +    RtlZeroMemory(CurrentDirectories, sizeof(CurrentDirectories));
> > >  @@ -2901,7 +2901,7 @@
> > >         WCHAR Buffer[256];
> > >
> > >         /* Clear the current directory buffer */
> > >  -    ZeroMemory(CurrentDirectories, sizeof(CurrentDirectories));
> > >  +    RtlZeroMemory(CurrentDirectories, sizeof(CurrentDirectories));
> > >  @@ -1901,7 +1901,7 @@
> > >
> > >     VOID VgaClearMemory(VOID)
> > >     {
> > >  -    ZeroMemory(VgaMemory, sizeof(VgaMemory));
> > >  +    RtlZeroMemory(VgaMemory, sizeof(VgaMemory));
> > >     }
> > >
> > >  
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