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------------------------------------------------------------------------------

--                                                                          --

--                         GNAT COMPILER COMPONENTS                         --

--                                                                          --

--                                 M L I B                                  --

--                                                                          --

--                                 B o d y                                  --

--                                                                          --

--                     Copyright (C) 1999-2009, AdaCore                     --

--                                                                          --

-- GNAT is free software;  you can  redistribute it  and/or modify it under --

-- terms of the  GNU General Public License as published  by the Free Soft- --

-- ware  Foundation;  either version 3,  or (at your option) any later ver- --

-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --

-- OUT 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  distributed with GNAT; see file COPYING3.  If not, go to --

-- http://www.gnu.org/licenses for a complete copy of the license.          --

--                                                                          --

-- GNAT was originally developed  by the GNAT team at  New York University. --

-- Extensive contributions were provided by Ada Core Technologies Inc.      --

--                                                                          --

------------------------------------------------------------------------------

with Ada.Characters.Handling; use Ada.Characters.Handling;

with Interfaces.C.Strings;

with System;

with Hostparm;

with Opt;

with Output; use Output;

with MLib.Utl; use MLib.Utl;

with Prj.Com;

with GNAT.Directory_Operations; use GNAT.Directory_Operations;

package body MLib is

   -------------------

   -- Build_Library --

   -------------------

   procedure Build_Library

     (Ofiles      : Argument_List;

      Output_File : String;

      Output_Dir  : String)

   is

   begin

      if Opt.Verbose_Mode and not Opt.Quiet_Output then

         Write_Line ("building a library...");

         Write_Str  ("   make ");

         Write_Line (Output_File);

      end if;

      Ar (Output_Dir &

          "lib" & Output_File & ".a", Objects => Ofiles);

   end Build_Library;

   ------------------------

   -- Check_Library_Name --

   ------------------------

   procedure Check_Library_Name (Name : String) is

   begin

      if Name'Length = 0 then

         Prj.Com.Fail ("library name cannot be empty");

      end if;

      if Name'Length > Max_Characters_In_Library_Name then

         Prj.Com.Fail ("illegal library name """

                       & Name

                       & """: too long");

      end if;

      if not Is_Letter (Name (Name'First)) then

         Prj.Com.Fail ("illegal library name """

                       & Name

                       & """: should start with a letter");

      end if;

      for Index in Name'Range loop

         if not Is_Alphanumeric (Name (Index)) then

            Prj.Com.Fail ("illegal library name """

                          & Name

                          & """: should include only letters and digits");

         end if;

      end loop;

   end Check_Library_Name;

   --------------------

   -- Copy_ALI_Files --

   --------------------

   procedure Copy_ALI_Files

     (Files      : Argument_List;

      To         : Path_Name_Type;

      Interfaces : String_List)

   is

      Success      : Boolean := False;

      To_Dir       : constant String := Get_Name_String (To);

      Is_Interface : Boolean := False;

      procedure Verbose_Copy (Index : Positive);

      --  In verbose mode, output a message that the indexed file is copied

      --  to the destination directory.

      ------------------

      -- Verbose_Copy --

      ------------------

      procedure Verbose_Copy (Index : Positive) is

      begin

         if Opt.Verbose_Mode then

            Write_Str ("Copying """);

            Write_Str (Files (Index).all);

            Write_Str (""" to """);

            Write_Str (To_Dir);

            Write_Line ("""");

         end if;

      end Verbose_Copy;

   --  Start of processing for Copy_ALI_Files

   begin

      if Interfaces'Length = 0 then

         --  If there are no Interfaces, copy all the ALI files as is

         for Index in Files'Range loop

            Verbose_Copy (Index);

            Set_Writable

              (To_Dir &

               Directory_Separator &

               Base_Name (Files (Index).all));

            Copy_File

              (Files (Index).all,

               To_Dir,

               Success,

               Mode => Overwrite,

               Preserve => Preserve);

            exit when not Success;

         end loop;

      else

         --  Copy only the interface ALI file, and put the special indicator

         --  "SL" on the P line.

         for Index in Files'Range loop

            declare

               File_Name : String := Base_Name (Files (Index).all);

            begin

               Canonical_Case_File_Name (File_Name);

               --  Check if this is one of the interface ALIs

               Is_Interface := False;

               for Index in Interfaces'Range loop

                  if File_Name = Interfaces (Index).all then

                     Is_Interface := True;

                     exit;

                  end if;

               end loop;

               --  If it is an interface ALI, copy line by line. Insert

               --  the interface indication at the end of the P line.

               --  Do not copy ALI files that are not Interfaces.

               if Is_Interface then

                  Success := False;

                  Verbose_Copy (Index);

                  Set_Writable

                    (To_Dir &

                     Directory_Separator &

                     Base_Name (Files (Index).all));

                  declare

                     FD           : File_Descriptor;

                     Len          : Integer;

                     Actual_Len   : Integer;

                     S            : String_Access;

                     Curr         : Natural;

                     P_Line_Found : Boolean;

                     Status       : Boolean;

                  begin

                     --  Open the file

                     Name_Len := Files (Index)'Length;

                     Name_Buffer (1 .. Name_Len) := Files (Index).all;

                     Name_Len := Name_Len + 1;

                     Name_Buffer (Name_Len) := ASCII.NUL;

                     FD := Open_Read (Name_Buffer'Address, Binary);

                     if FD /= Invalid_FD then

                        Len := Integer (File_Length (FD));

                        --  ??? Why "+3" here

                        S := new String (1 .. Len + 3);

                        --  Read the file. Note that the loop is not necessary

                        --  since the whole file is read at once except on VMS.

                        Curr := S'First;

                        while Curr <= Len loop

                           Actual_Len := Read (FD, S (Curr)'Address, Len);

                           --  Exit if we could not read for some reason

                           exit when Actual_Len = 0;

                           Curr := Curr + Actual_Len;

                        end loop;

                        --  We are done with the input file, so we close it

                        --  ignoring any bad status.

                        Close (FD, Status);

                        P_Line_Found := False;

                        --  Look for the P line. When found, add marker SL

                        --  at the beginning of the P line.

                        for Index in 1 .. Len - 3 loop

                           if (S (Index) = ASCII.LF

                                 or else

                               S (Index) = ASCII.CR)

                             and then S (Index + 1) = 'P'

                           then

                              S (Index + 5 .. Len + 3) := S (Index + 2 .. Len);

                              S (Index + 2 .. Index + 4) := " SL";

                              P_Line_Found := True;

                              exit;

                           end if;

                        end loop;

                        if P_Line_Found then

                           --  Create new modified ALI file

                           Name_Len := To_Dir'Length;

                           Name_Buffer (1 .. Name_Len) := To_Dir;

                           Name_Len := Name_Len + 1;

                           Name_Buffer (Name_Len) := Directory_Separator;

                           Name_Buffer

                             (Name_Len + 1 .. Name_Len + File_Name'Length) :=

                                File_Name;

                           Name_Len := Name_Len + File_Name'Length + 1;

                           Name_Buffer (Name_Len) := ASCII.NUL;

                           FD := Create_File (Name_Buffer'Address, Binary);

                           --  Write the modified text and close the newly

                           --  created file.

                           if FD /= Invalid_FD then

                              Actual_Len := Write (FD, S (1)'Address, Len + 3);

                              Close (FD, Status);

                              --  Set Success to True only if the newly

                              --  created file has been correctly written.

                              Success := Status and then Actual_Len = Len + 3;

                              if Success then

                                 --  Set_Read_Only is used here, rather than

                                 --  Set_Non_Writable, so that gprbuild can

                                 --  he compiled with older compilers.

                                 Set_Read_Only

                                   (Name_Buffer (1 .. Name_Len - 1));

                              end if;

                           end if;

                        end if;

                     end if;

                  end;

               --  This is not an interface ALI

               else

                  Success := True;

               end if;

            end;

            if not Success then

               Prj.Com.Fail ("could not copy ALI files to library dir");

            end if;

         end loop;

      end if;

   end Copy_ALI_Files;

   ----------------------

   -- Create_Sym_Links --

   ----------------------

   procedure Create_Sym_Links

     (Lib_Path    : String;

      Lib_Version : String;

      Lib_Dir     : String;

      Maj_Version : String)

   is

      function Symlink

        (Oldpath : System.Address;

         Newpath : System.Address) return Integer;

      pragma Import (C, Symlink, "__gnat_symlink");

      Version_Path : String_Access;

      Success : Boolean;

      Result  : Integer;

      pragma Unreferenced (Success, Result);

   begin

      Version_Path := new String (1 .. Lib_Version'Length + 1);

      Version_Path (1 .. Lib_Version'Length) := Lib_Version;

      Version_Path (Version_Path'Last)       := ASCII.NUL;

      if Maj_Version'Length = 0 then

         declare

            Newpath : String (1 .. Lib_Path'Length + 1);

         begin

            Newpath (1 .. Lib_Path'Length) := Lib_Path;

            Newpath (Newpath'Last)         := ASCII.NUL;

            Delete_File (Lib_Path, Success);

            Result := Symlink (Version_Path (1)'Address, Newpath'Address);

         end;

      else

         declare

            Newpath1 : String (1 .. Lib_Path'Length + 1);

            Maj_Path : constant String :=

                         Lib_Dir & Directory_Separator & Maj_Version;

            Newpath2 : String (1 .. Maj_Path'Length + 1);

            Maj_Ver  : String (1 .. Maj_Version'Length + 1);

         begin

            Newpath1 (1 .. Lib_Path'Length) := Lib_Path;

            Newpath1 (Newpath1'Last)        := ASCII.NUL;

            Newpath2 (1 .. Maj_Path'Length) := Maj_Path;

            Newpath2 (Newpath2'Last)        := ASCII.NUL;

            Maj_Ver (1 .. Maj_Version'Length) := Maj_Version;

            Maj_Ver (Maj_Ver'Last)            := ASCII.NUL;

            Delete_File (Maj_Path, Success);

            Result := Symlink (Version_Path (1)'Address, Newpath2'Address);

            Delete_File (Lib_Path, Success);

            Result := Symlink (Maj_Ver'Address, Newpath1'Address);

         end;

      end if;

   end Create_Sym_Links;

   --------------------------------

   -- Linker_Library_Path_Option --

   --------------------------------

   function Linker_Library_Path_Option return String_Access is

      Run_Path_Option_Ptr : Interfaces.C.Strings.chars_ptr;

      pragma Import (C, Run_Path_Option_Ptr, "__gnat_run_path_option");

      --  Pointer to string representing the native linker option which

      --  specifies the path where the dynamic loader should find shared

      --  libraries. Equal to null string if this system doesn't support it.

      S : constant String := Interfaces.C.Strings.Value (Run_Path_Option_Ptr);

   begin

      if S'Length = 0 then

         return null;

      else

         return new String'(S);

      end if;

   end Linker_Library_Path_Option;

   -------------------

   -- Major_Id_Name --

   -------------------

   function Major_Id_Name

     (Lib_Filename : String;

      Lib_Version  : String)

      return String

   is

      Maj_Version : constant String := Lib_Version;

      Last_Maj    : Positive;

      Last        : Positive;

      Ok_Maj      : Boolean := False;

   begin

      Last_Maj := Maj_Version'Last;

      while Last_Maj > Maj_Version'First loop

         if Maj_Version (Last_Maj) in '0' .. '9' then

            Last_Maj := Last_Maj - 1;

         else

            Ok_Maj := Last_Maj /= Maj_Version'Last and then

            Maj_Version (Last_Maj) = '.';

            if Ok_Maj then

               Last_Maj := Last_Maj - 1;

            end if;

            exit;

         end if;

      end loop;

      if Ok_Maj then

         Last := Last_Maj;

         while Last > Maj_Version'First loop

            if Maj_Version (Last) in '0' .. '9' then

               Last := Last - 1;

            else

               Ok_Maj := Last /= Last_Maj and then

               Maj_Version (Last) = '.';

               if Ok_Maj then

                  Last := Last - 1;

                  Ok_Maj :=

                    Maj_Version (Maj_Version'First .. Last) = Lib_Filename;

               end if;

               exit;

            end if;

         end loop;

      end if;

      if Ok_Maj then

         return Maj_Version (Maj_Version'First .. Last_Maj);

      else

         return "";

      end if;

   end Major_Id_Name;

   -------------------------------

   -- Separate_Run_Path_Options --

   -------------------------------

   function Separate_Run_Path_Options return Boolean is

      Separate_Paths : Boolean;

      for Separate_Paths'Size use Character'Size;

      pragma Import (C, Separate_Paths, "__gnat_separate_run_path_options");

   begin

      return Separate_Paths;

   end Separate_Run_Path_Options;

--  Package elaboration

begin

   --  Copy_Attributes always fails on VMS

   if Hostparm.OpenVMS then

      Preserve := None;

   end if;

end MLib;