126 lines
4.4 KiB
Ada
126 lines
4.4 KiB
Ada
------------------------------------------------------------------------------
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-- --
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-- GNAT COMPILER COMPONENTS --
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-- --
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-- S W I T C H --
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-- --
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-- B o d y --
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-- --
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-- Copyright (C) 1992-2005, 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 2, 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. See the GNU General Public License --
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-- for more details. You should have received a copy of the GNU General --
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-- Public License distributed with GNAT; see file COPYING. If not, write --
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-- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, --
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-- Boston, MA 02110-1301, USA. --
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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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with Osint;
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package body Switch is
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----------------
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-- Bad_Switch --
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----------------
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procedure Bad_Switch (Switch : Character) is
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begin
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Osint.Fail ("invalid switch: ", (1 => Switch));
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end Bad_Switch;
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procedure Bad_Switch (Switch : String) is
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begin
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Osint.Fail ("invalid switch: ", Switch);
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end Bad_Switch;
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-------------------------
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-- Is_Front_End_Switch --
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-------------------------
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function Is_Front_End_Switch (Switch_Chars : String) return Boolean is
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Ptr : constant Positive := Switch_Chars'First;
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begin
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return Is_Switch (Switch_Chars)
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and then
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(Switch_Chars (Ptr + 1) = 'I'
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or else (Switch_Chars'Length >= 5
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and then Switch_Chars (Ptr + 1 .. Ptr + 4) = "gnat")
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or else (Switch_Chars'Length >= 5
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and then Switch_Chars (Ptr + 2 .. Ptr + 4) = "RTS"));
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end Is_Front_End_Switch;
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---------------
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-- Is_Switch --
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---------------
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function Is_Switch (Switch_Chars : String) return Boolean is
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begin
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return Switch_Chars'Length > 1
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and then Switch_Chars (Switch_Chars'First) = '-';
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end Is_Switch;
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--------------
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-- Scan_Nat --
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--------------
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procedure Scan_Nat
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(Switch_Chars : String;
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Max : Integer;
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Ptr : in out Integer;
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Result : out Nat;
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Switch : Character)
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is
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begin
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Result := 0;
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if Ptr > Max or else Switch_Chars (Ptr) not in '0' .. '9' then
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Osint.Fail ("missing numeric value for switch: ", (1 => Switch));
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else
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while Ptr <= Max and then Switch_Chars (Ptr) in '0' .. '9' loop
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Result := Result * 10 +
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Character'Pos (Switch_Chars (Ptr)) - Character'Pos ('0');
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Ptr := Ptr + 1;
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if Result > Switch_Max_Value then
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Osint.Fail
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("numeric value out of range for switch: ", (1 => Switch));
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end if;
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end loop;
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end if;
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end Scan_Nat;
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--------------
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-- Scan_Pos --
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--------------
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procedure Scan_Pos
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(Switch_Chars : String;
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Max : Integer;
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Ptr : in out Integer;
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Result : out Pos;
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Switch : Character)
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is
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Temp : Nat;
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begin
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Scan_Nat (Switch_Chars, Max, Ptr, Temp, Switch);
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if Temp = 0 then
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Osint.Fail ("numeric value out of range for switch: ", (1 => Switch));
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end if;
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Result := Temp;
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end Scan_Pos;
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end Switch;
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