Re: need help learning Ada for a modula-2 programmer

["Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>]

On Sun, 02 Feb 2014 12:48:51 -0700, Jeffrey Carter wrote:

> On 02/02/2014 08:02 AM, agent@drrob1.com wrote:
>>
>> I don't use recursion in my code.  This is probably because the first
>> language I learned was Fortran 66, and I never needed it before.
> 
> An iterative version would collect the pieces in an Unbounded_String:
> 
> function Command_Line return String is
>     Result : Ada.Strings.Unbounded.Unbounded_String;

A side note.

The exercise does not make much sense anyway because the result is not the
actual command line as it would not include the command itself (the
application path) and the arguments returned would be most likely
translated and expanded (e.g. wildcards substituted, files found, I/O
redirection removed).

If the OP wants to get the command line he should use the OS services
instead. E.g.

http://msdn.microsoft.com/en-us/library/windows/desktop/ms683156%28v=vs.85%29.aspx

(accessible through Win32Ada bindings). Or reading from

/proc/self/cmdline

under Linux, etc.

In any case the behavior is highly dependent on the OS in question.

-- 
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de