Re: Interface with C codes

[Anh Vo <anhvofrcaus@gmail.com>]

On Friday, October 17, 2014 4:49:04 PM UTC-7, Adam Beneschan wrote:
> On Friday, October 17, 2014 4:22:15 PM UTC-7, 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;
> 
> >       -- ...
> 
> >    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);
> 
> 
> 
> > typedef struct           /* BOOT_PARAMS */
> 
> >     {
> 
> >     char bootDev [20];  /* boot device code */
> 
> >     * ... *
> 
> >     } BOOT_PARAMS;
> 
> > 
> 
> > Note that I can not use Ada 2012 yet.
> 
> > 
> 
> > char *  bootStringToStruct (char * bootString,  BOOT_PARAMS * pBootParams);
> 
> > 
> 
> > Anh Vo
> 
> I'm confused.  You've defined an Ada record Boot_Parameter_Type that has a pointer in it, and a C struct that does not have a pointer. 
> 

The second parameter of the function prototype use pointer, BOOT_PARAMS * pBootParams.

Anh Vo