Re: Ada.Command_Line.Argument_Count question

[Gautier write-only <gautier_niouzes@hotmail.com>]

On 15 sep, 22:58, Thomas Løcke wrote:
> The RM has this to say about Argument_Count:
>
> "If the external execution environment supports passing arguments to a
> program, then Argument_Count returns the number of arguments passed to
> the program invoking the function. Otherwise it returns 0. The meaning
> of “number of arguments” is implementation defined."
>
> I'm wondering what that last sentence mean? Is the RM trying to tell me
> that Argument_Count cannot be trusted to yield the same result on
> different systems (Unix, BSD, Windows, Linux and so on)?

Perhaps... And it the behaviour is compiler-dependent too!
Some systems will give 2 for ["a b" c]; others, 3 (maybe only DOS on
that!).
Some compilers will always return [*.adb] as is, others (GNAT) will
return one argument for each file corresponding to that pattern, or
still "*.adb" if there is no such file!
Always interesting to test a bit with that:

-- Displays the arguments given

with Ada.Command_Line;                  use Ada.Command_Line;
with Ada.Text_IO;                       use Ada.Text_IO;

procedure Args is
begin
  for I in 1..Argument_Count loop
    Put_Line(Integer'Image(I) & " [" & Argument(I) & ']');
  end loop;
  Put("Press Enter"); Skip_Line;
end;

Cheers
_________________________________________________________
Gautier's Ada programming -- http://sf.net/users/gdemont/
NB: For a direct answer, e-mail address on the Web site!