program chastelib;

const
 string0='Official test suite for the Pascal version of chastelib.'#10;

var //this is the global variable section
 a:integer;
 b:integer;
 
 radix:integer;       //current radix being used
 int_width:integer=1; //global integer width
 strint_errors:integer=0; //error result for strint function

(*
A function to print a string using Pascal's write function.
*)
procedure putstr(s:string);
begin
 write(s);
end;

(*
 a function to return a string form of an integer
 using the global radix variable
*)
function intstr(i:integer):string;
var
 s:string=''; //string that will be built and returned from this function
 width:integer=0; //the current width
 c:integer;
 ch:char;
begin
 while (i>0) or (width<int_width) do
 begin

  c:=i mod radix; //get integer division modulus or remainder
  i:=i div radix; //get integer division quotient

  (*turn remainder c into character ch for digit in this radix*)
  if c<10 then
  begin
   ch:=chr(c+48);
  end
  else
  begin
   ch:=chr(c+55);
  end;

   s:=ch+s; //prefix the string with this character
   width+=1;

 end;

 intstr:=s; //return this string from the function

end;

(*use both putstr and intstr to print an integer*)
procedure putint(i:integer);
begin
 putstr(intstr(i));
end;

(*
Because characters and integers are separate types in Pascal,
it is required to get the ASCII value of characters in the string
for the strint function so I can do the math the same way
as I did in the C version of the function.
*)

function strint(s:string):integer;
var
 i:integer=0; //integer that will be built and returned from this function
 x:integer=1; //index used to scan forward through the string
 c:integer=0;
begin
 strint_errors := 0; (*set zero errors before we parse the string*)
 if (radix<2) or (radix>36 ) then
 begin
  strint_errors+=1;
  writeln('Error: radix ',radix,' is out of range!');
 end;
 while(x<=length(s)) do
 begin
  c:=ord(s[x]);
  if (c>=ord('0')) and (c<=ord('9')) then 
  begin
   c-=ord('0')
  end
  else if (c>=ord('A')) and (c<=ord('Z')) then
  begin
   c-=ord('A');
   c+=10;
  end
  else if (c>=ord('a')) and (c<=ord('z')) then
  begin
   c-=ord('a');
   c+=10;
  end
  
  else if (c < $21 ) then
  begin
   break; (*end loop because we have found whitespace*)
  end
  
  else
  begin
   strint_errors+=1;
   writeln('Error: ',s[x],' is not an alphanumeric character!');break;
  end;
  
  if(c>=radix) then
  begin
   strint_errors+=1;
   writeln('Error: ',s[x],' is not a valid character for radix ',radix);
   break;
  end;
  
  i*=radix; //multiply by the radix
  i+=c;     //add the digit from the character processed

  x:=x+1;
 end;
 strint:=i;
end;




begin
 radix:=16; //set the radix used by both intstr and strint functions

 a:=0;
 b:=strint('100');

 putstr(string0);

 while a<b do
 begin
  radix:=2;
  int_width:=8;
  putint(a);
  putstr(' ');
  radix:=16;
  int_width:=2;
  putint(a);
  putstr(' ');
  radix:=10;
  int_width:=3;
  putint(a);

  if (a>=$20) and (a<=$7E) then
  begin
   putstr(' ');
   putstr(chr(a));
  end;

  putstr(#10);
  a+=1;
 end;
 
 putstr(string0);

end.

(*
 fpc main.pas && ./main
*)