------------------------------------------------------------------------------
------------------------------------------------------------------------------
-- Cheddar is a GNU GPL real-time scheduling analysis tool.
-- This program provides services to automatically check schedulability and
-- other performance criteria of real-time architecture models.
--
-- Copyright (C) 2002-2023, Frank Singhoff, Alain Plantec, Jerome Legrand,
--                          Hai Nam Tran, Stephane Rubini
--
-- The Cheddar project was started in 2002 by
-- Frank Singhoff, Lab-STICC UMR 6285, Université de Bretagne Occidentale
--
-- Cheddar has been published in the "Agence de Protection des Programmes/France" in 2008.
-- Since 2008, Ellidiss technologies also contributes to the development of
-- Cheddar and provides industrial support.
--
-- The full list of contributors and sponsors can be found in README.md
--
-- This program is free software; you can redistribute it and/or modify
-- it under the terms of the GNU General Public License as published by
-- the Free Software Foundation; either version 2 of the License, or
-- (at your option) any later version.
--
-- This program is distributed in the hope that it will be useful,
-- but WITHOUT ANY WARRANTY; without even the implied warranty of
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-- GNU General Public License for more details.
--
-- You should have received a copy of the GNU General Public License
-- along with this program; if not, write to the Free Software
-- Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
--
--
-- Contact : cheddar@listes.univ-brest.fr
--
------------------------------------------------------------------------------
-- Last update :
--    $Rev$
--    $Date$
--    $Author: singhoff $
------------------------------------------------------------------------------
------------------------------------------------------------------------------

with Text_IO;           use Text_IO;
with Ada.Sequential_IO;
with Ada.Directories;   use Ada.Directories;
with unbounded_strings; use unbounded_strings;

package body io_tools is

   -- Check is a file can be read
   -- Return True if the file can be read
   --
   function can_be_read (file_name : Unbounded_String) return Boolean is
      a_file : File_Type;
      result : Boolean := True;

   begin

      begin
         Open (a_file, In_File, To_String (file_name));
         Close (a_file);

      exception
         when others =>
            result := False;
      end;

      return result;

   end can_be_read;

   procedure reraise;
   pragma No_Return (reraise);
   pragma Import (C, reraise, "__gnat_reraise");
   --  Reraises the exception referenced by the Current_Excep field of
   --  the TSD (all fields of this exception occurrence are set). Abort
   --  is deferred before the reraise operation.

   procedure write_sequential_file
     (file_name : in Unbounded_String; data : in Unbounded_String)
   is

      package set_file is new Ada.Sequential_IO (Character);
      use set_file;
      a_file : set_file.File_Type;

   begin
      Create (a_file, Mode => Out_File, Name => To_String (file_name));

      if not Is_Open (a_file) then
         raise can_not_open_file_for_writing;
      end if;

      for i in 1 .. Length (data) loop
         Write (a_file, Element (data, i));
      end loop;

      Close (a_file);

   exception
      when others =>
         Close (a_file);
         reraise;

   end write_sequential_file;

   procedure write_sequential_file
     (file_name : in String; data : in Unbounded_String)
   is
   begin
      write_sequential_file (To_Unbounded_String (file_name), data);
   end write_sequential_file;

   function read_sequential_file (file_name : String) return Unbounded_String
   is
   begin
      return read_sequential_file (To_Unbounded_String (file_name));
   end read_sequential_file;

   function read_sequential_file
     (file_name : Unbounded_String) return Unbounded_String
   is
      desc   : Character;
      result : Unbounded_String;

      package set_file is new Ada.Sequential_IO (Character);
      use set_file;
      a_file : set_file.File_Type;

   begin
      Open (a_file, Mode => In_File, Name => To_String (file_name));

      if not Is_Open (a_file) then
         raise can_not_open_file_for_reading;
      end if;

      while not End_Of_File (a_file) loop
         Read (a_file, desc);
         result := result & desc;
      end loop;

      Close (a_file);

      return result;

   exception
      when others =>
         Close (a_file);
         reraise;

   end read_sequential_file;

   function simple_name (path : in Unbounded_String) return Unbounded_String is
   begin
      if (path = empty_string) then
         return path;
      else
         return To_Unbounded_String (Simple_Name (To_String (path)));
      end if;
   end simple_name;

end io_tools;