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------------------------------------------------------------------------------
-- --
-- GNAT COMPILER COMPONENTS --
-- --
-- S W I T C H --
-- --
-- S p e c --
-- --
-- Copyright (C) 1992-2018, 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. See the GNU General Public License --
-- for more details. You should have received a copy of the GNU General --
-- Public License distributed with GNAT; see file COPYING3. If not, go to --
-- http://www.gnu.org/licenses for a complete copy of the license. --
-- --
-- GNAT was originally developed by the GNAT team at New York University. --
-- Extensive contributions were provided by Ada Core Technologies Inc. --
-- --
------------------------------------------------------------------------------
-- This package together with a child package appropriate to the client tool
-- scans switches. Note that the body of the appropriate Usage package must be
-- coordinated with the switches that are recognized by this package. These
-- Usage packages also act as the official documentation for the switches
-- that are recognized. In addition, package Debug documents the otherwise
-- undocumented debug switches that are also recognized.
with Gnatvsn;
with Types; use Types;
------------
-- Switch --
------------
package Switch is
-- Common switches for GNU tools
Version_Switch : constant String := "--version";
Help_Switch : constant String := "--help";
-----------------
-- Subprograms --
-----------------
generic
with procedure Usage;
-- Print tool-specific part of --help message
procedure Check_Version_And_Help_G
(Tool_Name : String;
Initial_Year : String;
Version_String : String := Gnatvsn.Gnat_Version_String);
-- Check if switches --version or --help is used. If one of this switch is
-- used, issue the proper messages and end the process.
procedure Display_Version
(Tool_Name : String;
Initial_Year : String;
Version_String : String := Gnatvsn.Gnat_Version_String);
-- Display version of a tool when switch --version is used
procedure Display_Usage_Version_And_Help;
-- Output the two lines of usage for switches --version and --help
function Is_Switch (Switch_Chars : String) return Boolean;
-- Returns True iff Switch_Chars is at least two characters long, and the
-- first character is an hyphen ('-').
function Is_Front_End_Switch (Switch_Chars : String) return Boolean;
-- Returns True iff Switch_Chars represents a front-end switch, i.e. it
-- starts with -I, -gnat or -?RTS.
function Is_Internal_GCC_Switch (Switch_Chars : String) return Boolean;
-- Returns True iff Switch_Chars represents an internal GCC switch to be
-- followed by a single argument, such as -dumpbase, --param or -auxbase.
-- Even though passed by the "gcc" driver, these need not be stored in ALI
-- files and may safely be ignored by non GCC back-ends.
function Switch_Last (Switch_Chars : String) return Natural;
-- Index in Switch_Chars of the last relevant character for later string
-- comparison purposes. This is typically 'Last, minus one if there is a
-- terminating ASCII.NUL.
private
-- This section contains some common routines used by the tool dependent
-- child packages (there is one such child package for each tool that uses
-- Switches to scan switches - Compiler/gnatbind/gnatmake/.
Switch_Max_Value : constant := 999_999;
-- Maximum value permitted in switches that take a value
function Nat_Present
(Switch_Chars : String;
Max : Integer;
Ptr : Integer) return Boolean;
-- Returns True if an integer is at the current scan location or an equal
-- sign. This is used as a guard for calling Scan_Nat. Switch_Chars is the
-- string containing the switch, and Ptr points just past the switch
-- character. Max is the maximum allowed value of Ptr.
procedure Scan_Nat
(Switch_Chars : String;
Max : Integer;
Ptr : in out Integer;
Result : out Nat;
Switch : Character);
-- Scan natural integer parameter for switch. On entry, Ptr points just
-- past the switch character, on exit it points past the last digit of the
-- integer value. Max is the maximum allowed value of Ptr, so the scan is
-- restricted to Switch_Chars (Ptr .. Max). It is possible for Ptr to be
-- one greater than Max on return if the entire string is digits. Scan_Nat
-- will skip an optional equal sign if it is present. Nat_Present must be
-- True, or an error will be signalled.
procedure Scan_Pos
(Switch_Chars : String;
Max : Integer;
Ptr : in out Integer;
Result : out Pos;
Switch : Character);
-- Scan positive integer parameter for switch. Identical to Scan_Nat with
-- same parameters except that zero is considered out of range.
procedure Bad_Switch (Switch : Character);
procedure Bad_Switch (Switch : String);
pragma No_Return (Bad_Switch);
-- Fail with an appropriate message when a switch is not recognized
end Switch;
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