with Osint;
package body Switch is
procedure Bad_Switch (Switch : Character) is
begin
Osint.Fail ("invalid switch: ", (1 => Switch));
end Bad_Switch;
procedure Bad_Switch (Switch : String) is
begin
Osint.Fail ("invalid switch: ", Switch);
end Bad_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;
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;
procedure Scan_Nat
(Switch_Chars : String;
Max : Integer;
Ptr : in out Integer;
Result : out Nat;
Switch : Character)
is
begin
Result := 0;
if Ptr > Max or else Switch_Chars (Ptr) not in '0' .. '9' then
Osint.Fail ("missing numeric value for switch: ", (1 => Switch));
else
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
Osint.Fail
("numeric value out of range for switch: ", (1 => Switch));
end if;
end loop;
end if;
end Scan_Nat;
procedure Scan_Pos
(Switch_Chars : String;
Max : Integer;
Ptr : in out Integer;
Result : out Pos;
Switch : Character)
is
Temp : Nat;
begin
Scan_Nat (Switch_Chars, Max, Ptr, Temp, Switch);
if Temp = 0 then
Osint.Fail ("numeric value out of range for switch: ", (1 => Switch));
end if;
Result := Temp;
end Scan_Pos;
end Switch;