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From: Marius Amado Alves <amado.alves@netcabo.pt>
Newsgroups: comp.lang.ada
Subject: Re: Ada bench : count words
Date: Tue, 22 Mar 2005 17:39:42 +0000
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Date: 2005-03-22T17:39:42+00:00

> Why not use GNAT.OS_Lib.

I'm trying, but the program does not work properly. It seems to 
terminate too early, and the results oscillate between 20 and 49 lines. 
I'll be damned if I understand what's happening.

-- Count words in Ada for the language shootout
-- by Marius Amado Alves

with Ada.Characters.Handling;
with Ada.Characters.Latin_1;
with Ada.Strings.Fixed;
with Ada.Text_IO;
with GNAT.OS_Lib;

procedure Count_Words_OS_Lib is

    use Ada.Characters.Handling;
    use Ada.Characters.Latin_1;
    use Ada.Text_IO;

    Buffer : String (1 .. 4096);
    EOL : String := (1 => LF);
    Lines : Natural := 0;
    Words : Natural := 0;
    Total : Natural := 0;
    In_Word : Boolean := False;
    N : Natural;

    function Is_Separator (C : Character) return Boolean is
    begin
       return Is_Control (C) or C = ' ';
    end;

    procedure Begin_Word is
    begin
       In_Word := True;
    end;

    procedure End_Word is
    begin
       if In_Word then
          Words := Words + 1;
          In_Word := False;
       end if;
    end;

    procedure End_Line is
    begin
       Lines := Lines + 1;
       Total := Total + 1;
       End_Word;
    end;

    procedure Count_Words (S : in String) is
    begin
       Total := Total + S'Length;
       Lines := Lines + Ada.Strings.Fixed.Count (S, EOL);
       for I in S'Range loop
          if Is_Separator (S (I)) then
             if In_Word then End_Word; end if;
          else
             if not In_Word then Begin_Word; end if;
          end if;
       end loop;
    end;

    pragma Inline (Begin_Word, End_Word, End_Line, Count_Words);

begin
    loop
       N := GNAT.OS_Lib.Read
         (GNAT.OS_Lib.Standin,
          Buffer'Address,
          Buffer'Length);
       Count_Words (String (Buffer (1 .. N)));
       exit when N < Buffer'Length;
    end loop;

    Ada.Text_IO.Put_Line
      (Natural'Image (Lines) &
       Natural'Image (Words) &
       Natural'Image (Total));
end;