| ------------------------------------------------------------------------------ |
| -- -- |
| -- GNAT COMPILER COMPONENTS -- |
| -- -- |
| -- S W I T C H -- |
| -- -- |
| -- B o d y -- |
| -- -- |
| -- Copyright (C) 1992-2004, 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 + 2 .. Ptr + 4) = "RTS")); |
| 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 |
| Temp : Nat; |
| |
| begin |
| Scan_Nat (Switch_Chars, Max, Ptr, Temp); |
| |
| if Temp = 0 then |
| raise Bad_Switch_Value; |
| end if; |
| |
| Result := Temp; |
| end Scan_Pos; |
| |
| end Switch; |
