Re: Interface with C codes

[Anh Vo <anhvofrcaus@gmail.com>]

On Friday, October 17, 2014 7:20:45 PM UTC-7, Jeffrey Carter wrote:
> On 10/17/2014 04:22 PM, Anh Vo wrote:
> 
> > What Ada spec should be for the following C prototype where BOOT_PARAMS is a struct and responding Ada type is 
> >  
> > type Boot_Parameter_Type is 
> >    record 
> >       Boot_Dev : Interfaces.C.Strings.Chars_Ptr; 
> This doesn't match the C quoted below. Use
>                    Interfaces.C.Char_Array (0 .. 19);

Thanks for that.
> 
> >       -- ...
> 
> >    end record;
> > pragma Convention (C, Boot_Parameter_Type); 
> >  
> > type Boot_Parameter_Type_Access is access Boot_Parameter_Type; 
> > pragma Convention (C, Boot_Parameter_Type_Access);
> 
> You don't need this access type.
> 
> > char *  bootStringToStruct (char * bootString,  BOOT_PARAMS * pBootParams);
> 
> I would probably use

> function To_Record 
> (Boot_String : Intefaces.C.Char_Array; Boot_Parameter : Boot_Parameter_Type) 
> return Interfaces.C.Strings.Chars_Ptr;

> and rely on the advice in B.3(69-70): both parameters will be passed by reference.

Thanks again. I have enough info to test it out. 

Anh Vo