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-- --
-- --
-- A D A . C O M M A N D _ L I N E --
-- --
-- S p e c --
-- --
-- Copyright (C) 1992-2021, Free Software Foundation, Inc. --
-- --
-- This specification is derived from the Ada Reference Manual for use with --
-- GNAT. The copyright notice above, and the license provisions that follow --
-- apply solely to the contents of the part following the private keyword. --
-- --
-- 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 --
-- --
-- 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. --
-- --
package Ada.Command_Line is
pragma Preelaborate;
function Argument_Count return Natural;
-- If the external execution environment supports passing arguments to a
-- program, then Argument_Count returns the number of arguments passed to
-- the program invoking the function. Otherwise it return 0.
-- In GNAT: Corresponds to (argc - 1) in C.
pragma Assertion_Policy (Pre => Ignore);
-- We need to ignore the precondition of Argument, below, so that we don't
-- raise Assertion_Error. The body raises Constraint_Error. It would be
-- cleaner to add "or else raise Constraint_Error" to the precondition, but
-- SPARK does not yet support raise expressions.
function Argument (Number : Positive) return String with
Pre => Number <= Argument_Count;
-- If the external execution environment supports passing arguments to
-- a program, then Argument returns an implementation-defined value
-- corresponding to the argument at relative position Number. If Number
-- is outside the range 1 .. Argument_Count, then Constraint_Error is
-- propagated.
-- in GNAT: Corresponds to argv [n] (for n > 0) in C.
function Command_Name return String;
-- If the external execution environment supports passing arguments to
-- a program, then Command_Name returns an implementation-defined value
-- corresponding to the name of the command invoking the program.
-- Otherwise Command_Name returns the null string.
-- in GNAT: Corresponds to argv [0] in C.
type Exit_Status is new Integer;
Success : constant Exit_Status;
Failure : constant Exit_Status;
procedure Set_Exit_Status (Code : Exit_Status);
-- Note on Interface Requirements --
-- Services in this package are not supported during the elaboration of an
-- auto-initialized Stand-Alone Library.
-- If the main program is in Ada, this package works as specified without
-- any other work than the normal steps of WITH'ing the package and then
-- calling the desired routines.
-- If the main program is not in Ada, then the information must be made
-- available for this package to work correctly. In particular, it is
-- required that the global variable "gnat_argc" contain the number of
-- arguments, and that the global variable "gnat_argv" points to an
-- array of null-terminated strings, the first entry being the command
-- name, and the remaining entries being the command arguments.
-- These correspond to the normal argc/argv variables passed to a C
-- main program, and the following is an example of a complete C main
-- program that stores the required information:
-- main(int argc, char **argv, char **envp)
-- {
-- extern int gnat_argc;
-- extern char **gnat_argv;
-- extern char **gnat_envp;
-- gnat_argc = argc;
-- gnat_argv = argv;
-- gnat_envp = envp;
-- adainit();
-- adamain();
-- adafinal();
-- }
-- The assignment statements ensure that the necessary information is
-- available for finding the command name and command line arguments.
Success : constant Exit_Status := 0;
Failure : constant Exit_Status := 1;
-- The following locations support the operation of the package
-- Ada.Command_Line.Remove, which provides facilities for logically
-- removing arguments from the command line. If one of the remove
-- procedures is called in this unit, then Remove_Args/Remove_Count
-- are set to indicate which arguments are removed. If no such calls
-- have been made, then Remove_Args is null.
Remove_Count : Natural;
-- Number of arguments reflecting removals. Not defined unless
-- Remove_Args is non-null.
type Arg_Nums is array (Positive range <>) of Positive;
type Arg_Nums_Ptr is access Arg_Nums;
-- An array that maps logical argument numbers (reflecting removal)
-- to physical argument numbers (e.g. if the first argument has been
-- removed, but not the second, then Arg_Nums (1) will be set to 2.
Remove_Args : Arg_Nums_Ptr := null;
-- Left set to null if no remove calls have been made, otherwise set
-- to point to an appropriate mapping array. Only the first Remove_Count
-- elements are relevant.
pragma Import (C, Set_Exit_Status, "__gnat_set_exit_status");
end Ada.Command_Line;