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