132 lines
4.5 KiB
Ada
132 lines
4.5 KiB
Ada
------------------------------------------------------------------------------
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-- --
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-- GNAT RUN-TIME COMPONENTS --
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-- --
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-- A D A . C O M M A N D _ L I N E --
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-- --
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-- B o d y --
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-- --
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-- Copyright (C) 1992-2013, Free Software Foundation, Inc. --
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-- --
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-- GNAT is free software; you can redistribute it and/or modify it under --
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-- terms of the GNU General Public License as published by the Free Soft- --
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-- ware Foundation; either version 3, or (at your option) any later ver- --
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-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE. --
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-- --
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-- As a special exception under Section 7 of GPL version 3, you are granted --
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-- additional permissions described in the GCC Runtime Library Exception, --
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-- version 3.1, as published by the Free Software Foundation. --
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-- --
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-- You should have received a copy of the GNU General Public License and --
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-- a copy of the GCC Runtime Library Exception along with this program; --
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-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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-- <http://www.gnu.org/licenses/>. --
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-- --
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-- GNAT was originally developed by the GNAT team at New York University. --
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-- Extensive contributions were provided by Ada Core Technologies Inc. --
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-- --
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------------------------------------------------------------------------------
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pragma Compiler_Unit_Warning;
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with System; use System;
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package body Ada.Command_Line is
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function Arg_Count return Natural;
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pragma Import (C, Arg_Count, "__gnat_arg_count");
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procedure Fill_Arg (A : System.Address; Arg_Num : Integer);
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pragma Import (C, Fill_Arg, "__gnat_fill_arg");
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function Len_Arg (Arg_Num : Integer) return Integer;
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pragma Import (C, Len_Arg, "__gnat_len_arg");
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-----------------------
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-- Local Subprograms --
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-----------------------
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function Initialized return Boolean;
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-- Checks to ensure that gnat_argc and gnat_argv have been properly
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-- initialized. Returns false if not, or if argv / argc are
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-- unsupported on the target (e.g. VxWorks).
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--------------
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-- Argument --
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--------------
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function Argument (Number : Positive) return String is
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Num : Positive;
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begin
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if Number > Argument_Count then
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raise Constraint_Error;
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end if;
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if Remove_Args = null then
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Num := Number;
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else
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Num := Remove_Args (Number);
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end if;
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declare
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Arg : aliased String (1 .. Len_Arg (Num));
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begin
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Fill_Arg (Arg'Address, Num);
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return Arg;
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end;
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end Argument;
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--------------------
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-- Argument_Count --
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--------------------
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function Argument_Count return Natural is
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begin
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if not Initialized then
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-- RM A.15 (11)
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return 0;
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end if;
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if Remove_Args = null then
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return Arg_Count - 1;
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else
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return Remove_Count;
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end if;
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end Argument_Count;
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-----------------
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-- Initialized --
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-----------------
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function Initialized return Boolean is
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gnat_argv : System.Address;
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pragma Import (C, gnat_argv, "gnat_argv");
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begin
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return gnat_argv /= System.Null_Address;
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end Initialized;
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------------------
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-- Command_Name --
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------------------
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function Command_Name return String is
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begin
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if not Initialized then
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return "";
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end if;
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declare
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Arg : aliased String (1 .. Len_Arg (0));
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begin
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Fill_Arg (Arg'Address, 0);
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return Arg;
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end;
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end Command_Name;
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end Ada.Command_Line;
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