Sample code for a linked list implementation - Delphi pointer free :-)

Feel free to improve!

program linkedlist;

{$APPTYPE CONSOLE}

{$R *.res}

uses
  System.SysUtils;

var storage : Array[1 .. 20] of string;
var pointer : Array[1 .. 20] of integer;
var freelist: Array[1..20] of integer;
var liststart : integer;
var freestart : integer;

procedure additem(itemstring:string);
var lastitem : boolean;
    item : integer;
begin
  lastitem := false;
  item := liststart;
  // search through the list for the end
  while not lastitem do
  begin
     write('.');
     if pointer[item] = 0 then
     begin
       writeln;
       //writeln('found end of list at position ', item);
       lastitem := true;
     end else begin
       item := pointer[item];
     end;
  // item should now point at the end of the list
  end;
  // now put the item at freestart
  storage[freestart] := itemstring;
  // set the pointer at the old list end to the new item
  pointer[item] := freestart;
  // mark this new position as the end of the list
  pointer[freestart] := 0;
  // and update freestart to the next item on the list
  freestart := freelist[freestart];
end;
procedure displayitems;
var i : integer;
begin
  for i  := 1 to 20 do
    begin
      writeln(i,':',freelist[i],'->',storage[i],'<-',pointer[i]);
    end;
    writeln('First free item is position ',freestart);
    readln;

end;

procedure deleteitem(itemno: integer);
var foundit : boolean;
    item : integer;
begin
  foundit := false;
  item := 1;
  // search through the list for the item
  // we need to find what record comes before it
  // so that we can adjust the pointer
  while not foundit do
  begin
    if pointer[item] = itemno then
    begin
      foundit := true;
    end else begin
      item := pointer[item];
    end;
  end;
  // got it.  Now copy the pointer of the deleted item
  // to the previous item
  pointer[item] := pointer[itemno];
  // remove the item text
  storage[itemno] := '';
  // and adjust the freelist to start in the vacant slot
  // first make sure that the list item points to the old first item
  freelist[itemno] := freestart;
  // then make the start position this new 'hole'
  freestart := itemno;

end;

procedure setup;
var i : integer;
begin
  liststart := 1;
  freestart := 1;
  for i := 1 to 19 do
    begin
      pointer[i] := 0;
      freelist[i] := i+1  ;
    end;
  freelist[20] := 0;

end;
begin
 setup;
 additem('Tinker');
 additem('Tailor');
 additem('Soldier');
 additem('Spy');
 deleteitem(2);
 additem('Candlestickmaker');
 displayitems;
 readln;

end.