Re: Ada.Command_Line.Argument_Count question

[Robert A Duff <bobduff@shell01.TheWorld.com>]

John McCabe <john@nospam.assen.demon.co.uk> writes:

> On Thu, 17 Sep 2009 22:12:17 -0700 (PDT), sjw <simon.j.wright@mac.com>
> wrote:
>
>>On Sep 17, 2:50�pm, John McCabe <j...@nospam.assen.demon.co.uk> wrote:
>>
>>> For example if, on the command line, I type:
>>>
>>> prog1.exe a b c
>>>
>>> Does Argument_Count() return 3 or 4? I haven't looked at this
>>> paragraph in detail, or what surrounds it, but "the number of
>>> arguments passed to the program invoking the function" sounds a bit
>>> vague. Is the "program invoking the function" the shell, or the
>>> program you're running?
>>
>>3.
>
>>The program you're running.
>
> For all implementations?

For all reasonable implementations.  It is possible to create a
conforming Ada implementation that does something weird, because
the RM leaves all this implementation-defined.  It has to, because
we can't know about all operating systems.  But for any operating
system that supports command-line arguments, you can count on the
Ada implementation NOT including the command name itself as one
of the arguments.

> I see that Ada.Command_Line.Command_Name returns the name of the
> program that's been run. On Gnat at least it all makes sense. Compared
> to C++ (MSVC) on Win32 for:
>
> printargs.exe 1 2 3
>
> I get..
>                Ada            C++
> Argument Count 3              4
> command name   printargs.exe  equiv. to argv[0]
> argument 1     1              1
> argument 2     2              2
> argument 3     3              3
>
> I guess, from the Annotated ARM, section A.15(22) & A.15(22a).

Right.

- Bob