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------------------------------------------------------------------------------
-- --
-- GNAT COMPILER COMPONENTS --
-- --
-- S W I T C H --
-- --
-- B o d y --
-- --
-- --
-- Copyright (C) 1992-2001, 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 2, 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 COPYING. If not, write --
-- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
-- MA 02111-1307, USA. --
-- --
-- GNAT was originally developed by the GNAT team at New York University. --
-- Extensive contributions were provided by Ada Core Technologies Inc. --
-- --
------------------------------------------------------------------------------
package body Switch is
-------------------------
-- Is_Front_End_Switch --
-------------------------
function Is_Front_End_Switch (Switch_Chars : String) return Boolean is
Ptr : constant Positive := Switch_Chars'First;
begin
return Is_Switch (Switch_Chars)
and then
(Switch_Chars (Ptr + 1) = 'I'
or else (Switch_Chars'Length >= 5
and then Switch_Chars (Ptr + 1 .. Ptr + 4) = "gnat")
or else (Switch_Chars'Length >= 5
and then Switch_Chars (Ptr + 1 .. Ptr + 4) = "fRTS"));
end Is_Front_End_Switch;
---------------
-- Is_Switch --
---------------
function Is_Switch (Switch_Chars : String) return Boolean is
begin
return Switch_Chars'Length > 1
and then Switch_Chars (Switch_Chars'First) = '-';
end Is_Switch;
------------------------
--------------
-- Scan_Nat --
--------------
procedure Scan_Nat
(Switch_Chars : String;
Max : Integer;
Ptr : in out Integer;
Result : out Nat)
is
begin
Result := 0;
if Ptr > Max or else Switch_Chars (Ptr) not in '0' .. '9' then
raise Missing_Switch_Value;
end if;
while Ptr <= Max and then Switch_Chars (Ptr) in '0' .. '9' loop
Result := Result * 10 +
Character'Pos (Switch_Chars (Ptr)) - Character'Pos ('0');
Ptr := Ptr + 1;
if Result > Switch_Max_Value then
raise Bad_Switch_Value;
end if;
end loop;
end Scan_Nat;
--------------
-- Scan_Pos --
--------------
procedure Scan_Pos
(Switch_Chars : String;
Max : Integer;
Ptr : in out Integer;
Result : out Pos) is
begin
Scan_Nat (Switch_Chars, Max, Ptr, Result);
if Result = 0 then
raise Bad_Switch_Value;
end if;
end Scan_Pos;
end Switch;
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