[fpc-pascal] How to translate this union ?

[Ludo Brands]

OK . You have avoided using macros but are loosing the access to "pseudo"
members su_len,su_family,su_port and su_scope_id. The DOCUMENTATION_ONLY
suggests that these members are documented parts of the interface. Also it
will be up to the user to figure out where to get su_len according to
SU_HAVE_SOCKADDR_SA_LEN.
 
 
 -----Message d'origine-----
De : fpc-pascal-bounces at lists.freepascal.org
[mailto:fpc-pascal-bounces at lists.freepascal.org] De la part de ik
Envoyé : jeudi 5 mai 2011 15:19
À : FPC-Pascal users discussions
Objet : Re: RE : RE : RE : [fpc-pascal] How to translate this union ?




I've done the following at the moment:

{$IFDEF SU_HAVE_SOCKADDR_SA_LEN}
// #define               su_len          su_sa.sa_len <- unsupported for now
{$ELSE}
// #define               su_len          su_array[0] <- unsupported for now
{$ENDIF}
// #define               su_family       su_sa.sa_family <- unsupported for
now
// #define               su_port         su_sin.sin_port <- unsupported for
now
// #define               su_scope_id     su_array32[6] <- unsupported for
now  

su_sockaddr_u  = record
                     case Byte of
                       0 : (su_dummy   : cshort);                  //< Dummy
member to initialize
                       1 : (su_array   : array[0..31] of char);    //
Presented as chars
                       2 : (su_array16 : array[0..15] of cuint16); //
Presented as 16-bit ints
                       3 : (su_array32 : array[0..8]  of cuint32); //
Presented as 32-bit ints
                       4 : (su_sa      : sockaddr);                //
Address in struct sockaddr format
                       5 : (su_sin     : sockaddr_in);             //
Address in IPv4 format
{$IFDEF SU_HAVE_IN6}
                       6 : (su_sin6    : sockaddr_in6);            //
Address in IPv6 format
{$ENDIF}
                   end;


As I understood by you and C developers that I talked to, the macro create a
shortcut to be used.

Thanks,

Ido


On Sat, Apr 30, 2011 at 11:53, Ludo Brands <ludo.brands at free.fr> wrote:


Using macros, the translation looks like
 
{$MACRO ON}
{$ifndef DOCUMENTATION_ONLY}
{$if SU_HAVE_SOCKADDR_SA_LEN <>0}
  {$define su_len:=su_sa.sa_len}
{$else}
  {$define su_len:=su_array[0]}
{$endif}
{$define su_family:=su_sa.sa_family}
{$define su_port:=su_sin.sin_port}
{$define su_scope_id:=su_array32[6]}
{$endif}
type
    su_sockaddr_u = record
        case longint of
          {$ifdef DOCUMENTATION_ONLY}
          0 : ( su_len : byte );
          1 : ( su_family : byte );
          2 : ( su_port : word );
          {$else}
          3 : ( su_dummy : smallint );
          {$endif}
          4 : ( su_array : array[0..31] of char );
          5 : ( su_array16 : array[0..15] of word );
          6 : ( su_array32 : array[0..7] of longword );
          7 : ( su_sa : sockaddr );
          8 : ( su_sin : sockaddr_in );
          {$if SU_HAVE_IN6 <>0}
          9 : ( su_sin6 : sockaddr_in6 );
          {$endif}
          {$ifdef DOCUMENTATION_ONLY}
          10 : ( su_scope_id : longword );
          {$endif}
        end;



-----Message d'origine-----
De : fpc-pascal-bounces at lists.freepascal.org
[mailto:fpc-pascal-bounces at lists.freepascal.org] De la part de Ludo Brands

Envoyé : samedi 30 avril 2011 10:29 

À : 'FPC-Pascal users discussions'

Objet : RE : RE : [fpc-pascal] How to translate this union ?


Forget my previous reply. I found the original header file on sourceforge. 
 
I have alse a better understanding now of what the code is supposed to do:
in case DOCUMENTATION_ONLY is not defined,  a reference to, for example,
su_sockaddr_u.su_family will be subsstituted by
su_sockaddr_u.susa.sa_family. 
You could use macros and do a {$define su_family:=susa.sa_family} with the
following limitations:
- if you have variables or other record members named su_family, not part of
the su_sockaddr_u record, they will be renamed also. 
- it works only for the units that include your .inc file.
 

-----Message d'origine-----
De : fpc-pascal-bounces at lists.freepascal.org
[mailto:fpc-pascal-bounces at lists.freepascal.org] De la part de Ludo Brands
Envoyé : samedi 30 avril 2011 09:18
À : 'FPC-Pascal users discussions'
Objet : RE : [fpc-pascal] How to translate this union ?


Can you post the original c code? You point to a file that seems to be a
reworked output from h2pas. As it is now, it indeed doesn't make any sense.
I would think the su_len,su_family,su_port should make up a record but they
aren't.
 
I suggest you move the #defines inside the union declaration to somewhere
before the union declaration. It'll double up the ifdef's but make the code
so much more readable.
 
 
-----Message d'origine-----
De : fpc-pascal-bounces at lists.freepascal.org
[mailto:fpc-pascal-bounces at lists.freepascal.org] De la part de ik
Envoyé : vendredi 29 avril 2011 22:15
À : FPC-Pascal users discussions
Objet : [fpc-pascal] How to translate this union ?



Hello list,

I'm trying to translate the following union
<https://github.com/ik5/sofia-sip/blob/master/src/lib/sui.inc#L199>  to
Pascal, but I do not understand it, and so does h2pas.
How to translate it ?

Thanks,

Ido



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