gcc/ada/a-comlin.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT RUNTIME COMPONENTS                          --
   4 --                                                                          --
   5 --                     A D A . C O M M A N D _ L I N E                      --
   6 --                                                                          --
   7 --                                 B o d y                                  --
   8 --                                                                          --
   9 --                                                                          --
  10 --          Copyright (C) 1992-2001 Free Software Foundation, Inc.          --
  11 --                                                                          --
  12 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
  13 -- terms of the  GNU General Public License as published  by the Free Soft- --
  14 -- ware  Foundation;  either version 2,  or (at your option) any later ver- --
  15 -- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
  16 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  17 -- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
  18 -- for  more details.  You should have  received  a copy of the GNU General --
  19 -- Public License  distributed with GNAT;  see file COPYING.  If not, write --
  20 -- to  the Free Software Foundation,  59 Temple Place - Suite 330,  Boston, --
  21 -- MA 02111-1307, USA.                                                      --
  22 --                                                                          --
  23 -- As a special exception,  if other files  instantiate  generics from this --
  24 -- unit, or you link  this unit with other files  to produce an executable, --
  25 -- this  unit  does not  by itself cause  the resulting  executable  to  be --
  26 -- covered  by the  GNU  General  Public  License.  This exception does not --
  27 -- however invalidate  any other reasons why  the executable file  might be --
  28 -- covered by the  GNU Public License.                                      --
  29 --                                                                          --
  30 -- GNAT was originally developed  by the GNAT team at  New York University. --
  31 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  32 --                                                                          --
  33 ------------------------------------------------------------------------------
  34
  35 with System;
  36 package body Ada.Command_Line is
  37
  38    function Arg_Count return Natural;
  39    pragma Import (C, Arg_Count, "__gnat_arg_count");
  40
  41    procedure Fill_Arg (A : System.Address; Arg_Num : Integer);
  42    pragma Import (C, Fill_Arg, "__gnat_fill_arg");
  43
  44    function Len_Arg (Arg_Num : Integer) return Integer;
  45    pragma Import (C, Len_Arg, "__gnat_len_arg");
  46
  47    --------------
  48    -- Argument --
  49    --------------
  50
  51    function Argument (Number : in Positive) return String is
  52       Num : Positive;
  53
  54    begin
  55       if Number > Argument_Count then
  56          raise Constraint_Error;
  57       end if;
  58
  59       if Remove_Args = null then
  60          Num := Number;
  61       else
  62          Num := Remove_Args (Number);
  63       end if;
  64
  65       declare
  66          Arg : aliased String (1 .. Len_Arg (Num));
  67
  68       begin
  69          Fill_Arg (Arg'Address, Num);
  70          return Arg;
  71       end;
  72    end Argument;
  73
  74    --------------------
  75    -- Argument_Count --
  76    --------------------
  77
  78    function Argument_Count return Natural is
  79    begin
  80       if Remove_Args = null then
  81          return Arg_Count - 1;
  82       else
  83          return Remove_Count;
  84       end if;
  85    end Argument_Count;
  86
  87    ------------------
  88    -- Command_Name --
  89    ------------------
  90
  91    function Command_Name return String is
  92       Arg : aliased String (1 .. Len_Arg (0));
  93
  94    begin
  95       Fill_Arg (Arg'Address, 0);
  96       return Arg;
  97    end Command_Name;
  98
  99 end Ada.Command_Line;