------------------------------------------------------------------------------ -- -- -- GNAT RUN-TIME COMPONENTS -- -- -- -- A D A . C O M M A N D _ L I N E -- -- -- -- B o d y -- -- -- -- Copyright (C) 1992-2009, Free Software Foundation, Inc. -- -- -- -- 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. -- -- -- -- As a special exception under Section 7 of GPL version 3, you are granted -- -- additional permissions described in the GCC Runtime Library Exception, -- -- version 3.1, as published by the Free Software Foundation. -- -- -- -- You should have received a copy of the GNU General Public License and -- -- a copy of the GCC Runtime Library Exception along with this program; -- -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see -- -- . -- -- -- -- GNAT was originally developed by the GNAT team at New York University. -- -- Extensive contributions were provided by Ada Core Technologies Inc. -- -- -- ------------------------------------------------------------------------------ pragma Compiler_Unit; with System; use System; package body Ada.Command_Line is function Arg_Count return Natural; pragma Import (C, Arg_Count, "__gnat_arg_count"); procedure Fill_Arg (A : System.Address; Arg_Num : Integer); pragma Import (C, Fill_Arg, "__gnat_fill_arg"); function Len_Arg (Arg_Num : Integer) return Integer; pragma Import (C, Len_Arg, "__gnat_len_arg"); ----------------------- -- Local Subprograms -- ----------------------- function Initialized return Boolean; -- Checks to ensure that gnat_argc and gnat_argv have been properly -- initialized. Returns false if not, or if argv / argc are -- unsupported on the target (e.g. VxWorks). -------------- -- Argument -- -------------- function Argument (Number : Positive) return String is Num : Positive; begin if Number > Argument_Count then raise Constraint_Error; end if; if Remove_Args = null then Num := Number; else Num := Remove_Args (Number); end if; declare Arg : aliased String (1 .. Len_Arg (Num)); begin Fill_Arg (Arg'Address, Num); return Arg; end; end Argument; -------------------- -- Argument_Count -- -------------------- function Argument_Count return Natural is begin if not Initialized then -- RM A.15 (11) return 0; end if; if Remove_Args = null then return Arg_Count - 1; else return Remove_Count; end if; end Argument_Count; ----------------- -- Initialized -- ----------------- function Initialized return Boolean is gnat_argv : System.Address; pragma Import (C, gnat_argv, "gnat_argv"); begin return gnat_argv /= System.Null_Address; end Initialized; ------------------ -- Command_Name -- ------------------ function Command_Name return String is begin if not Initialized then return ""; end if; declare Arg : aliased String (1 .. Len_Arg (0)); begin Fill_Arg (Arg'Address, 0); return Arg; end; end Command_Name; end Ada.Command_Line;