[fpc-pascal] Resending: Trying to convert some C code

[Ole J. Røtne]

Hello again

My 5 year old kid did send this before I got it ready,
So here goes again..  


Would any FPC guru help me converting this C code? 
(it's from bn.h/libeay32.dll)
 
 
typedef struct bignum_st BIGNUM;
 
struct bignum_st
{
  BN_ULONG *d;
  int top;
  int dmax;
  int neg;
  int flags;
};

char *BN_bn2hex(const BIGNUM *a);
 
 
I guess my problem is understanding pointers, and how they work.
Tried something like this (did cut some checks & stuff to 
make it short):

Unit bn;

{$MODE DELPHI}{$H+}

interface

uses
  DynLibs;

type
  bignum_st = record
    d:pointer;
    dmax:integer;
    neg:integer;
    flag:integer;
  end;
  BIGNUM = bignum_st;
  
  BNPtr = ^BIGNUM;

var
  BnLibHandle: TLibHandle = 0;

function InitLib: Boolean;
function BN_Bn2Hex(const a:BNPtr):PChar;

implementation

Type
  TBN_bn2hex = function(a:BNPtr):PChar;

var
  _BnBn2Hex: TBN_bn2hex = nil;

function BN_Bn2Hex(a:BNPtr):PChar;
begin
    _BnBn2Hex(a);
end;

Function InitLib:boolean;
Begin
  LibHandle := LoadLibrary('libeay32.dll');
  _BnBn2Hex := GetProcAddress( BnLibHandle, 'BN_bn2hex');
  result := true;
End;
End.


Left bits of the code out, and probably to much.
But I hope you get the idea..

(memo to self: never get coffe while kids are alone at comp)
 
Ole JR