GNAT and Command Line Arguments

GNAT and Command Line Arguments

[Jim Rogers]

Hi all.

I am using GNAT to learn more about the features of Ada9X (and Ada in general).
I am working up a proposal to have our division's R&D lab move from C based
languages (C & C++) to Ada.

My current question:

How do I write an Ada program so that I can pass file names in from the
UNIX command line?  I am running GNAT under HPUX.

--
------------------------------------------------------------------------------
| Jim Rogers                    | Dead Reckoning:                            |
| Hewlett-Packard Company       | Traditional form of rough-estimate         |
| Colorado Springs Division     | navigation used for hundreds of years by   |
|                               | sailors, almost all of whom are dead.      |
| jimr@col.hp.com               |                                            |
------------------------------------------------------------------------------

Re: GNAT and Command Line Arguments

[Magnus Kempe]

jimr@col.hp.com (Jim Rogers) writes:
: 
: How do I write an Ada program so that I can pass file names in from the
: UNIX command line?  I am running GNAT under HPUX.

It's part of the predefined language environment in Ada 9X:
  A.15 "The Package Command_Line".

Just verified; it is implemented in GNAT.
-- 
Magnus Kempe		"I know not what course others may take, but as for me,
Magnus.Kempe@di.epfl.ch  Give me Liberty... or give me Death!" -- Patrick Henry

Re: GNAT and Command Line Arguments

[Bob Duff]

In article <383amh$95h@hp-col.col.hp.com>, Jim Rogers <jimr@col.hp.com> wrote:
>How do I write an Ada program so that I can pass file names in from the
>UNIX command line?  I am running GNAT under HPUX.

Check out the package Command_Line, in RM9X-A.15;5.0.  I don't know if
GNAT currently supports it, yet.  The semantics of Command_Line are
somewhat implemenation defined, of course, since different operating
systems have different notions of command lines.

- Bob
-- 
Bob Duff                                bobduff@inmet.com
Oak Tree Software, Inc.
Ada 9X Mapping/Revision Team (Intermetrics, Inc.)

Re: GNAT and Command Line Arguments

[paus]

In article <383amh$95h@hp-col.col.hp.com> jimr@col.hp.com (Jim Rogers) writes:
> 
> My current question:
> 
> How do I write an Ada program so that I can pass file names in from the
> UNIX command line?  I am running GNAT under HPUX.
> 

Just use the RTL package Ada.Command_Line. It's built into GNAT and it is
standard now in Ada9X.

--
|----------------------------------------------------------------------|
|Dipl.-Ing. Michael Paus   (Member: Team Ada)                          |
|University of Stuttgart, Inst. of Flight Mechanics and Flight Control |
|Forststrasse 86, 70176 Stuttgart, Germany                             |
|Phone: (+49) 711-121-1434  FAX: (+49) 711-634856                      |
|Email: Michael.Paus@ifr.luftfahrt.uni-stuttgart.de (NeXT-Mail welcome)|

Re: GNAT and Command Line Arguments

[paus]

In article <383amh$95h@hp-col.col.hp.com> jimr@col.hp.com (Jim Rogers) writes:
> 
> How do I write an Ada program so that I can pass file names in from the
> UNIX command line?  I am running GNAT under HPUX.
> 

Just use the RTL package Ada.Command_Line. It's built into GNAT and it is
standard now in Ada9X.


|----------------------------------------------------------------------|
|Dipl.-Ing. Michael Paus   (Member: Team Ada)                          |
|University of Stuttgart, Inst. of Flight Mechanics and Flight Control |
|Forststrasse 86, 70176 Stuttgart, Germany                             |
|Phone: (+49) 711-121-1434  FAX: (+49) 711-634856                      |
|Email: Michael.Paus@ifr.luftfahrt.uni-stuttgart.de (NeXT-Mail welcome)|

Re: GNAT and Command Line Arguments

[paus]

In article <383amh$95h@hp-col.col.hp.com> jimr@col.hp.com (Jim Rogers) writes:

> How do I write an Ada program so that I can pass file names in from the
> UNIX command line?  I am running GNAT under HPUX.



Just use the RTL package Ada.Command_Line. It's built into GNAT and it is
standard now in Ada9X.



|----------------------------------------------------------------------|
|Dipl.-Ing. Michael Paus   (Member: Team Ada)                          |
|University of Stuttgart, Inst. of Flight Mechanics and Flight Control |
|Forststrasse 86, 70176 Stuttgart, Germany                             |
|Phone: (+49) 711-121-1434  FAX: (+49) 711-634856                      |
|Email: Michael.Paus@ifr.luftfahrt.uni-stuttgart.de (NeXT-Mail welcome)|

Re: GNAT and Command Line Arguments

[paus]

In article <383amh$95h@hp-col.col.hp.com> jimr@col.hp.com (Jim Rogers) writes:
> How do I write an Ada program so that I can pass file names in from the
> UNIX command line?  I am running GNAT under HPUX.

Just use the RTL package Ada.Comnand_Line. It's built into GNAT and it
is standard now in Ada9X.

--
|----------------------------------------------------------------------|
|Dipl.-Ing. Michael Paus   (Member: Team Ada)                          |
|University of Stuttgart, Inst. of Flight Mechanics and Flight Control |
|Forststrasse 86, 70176 Stuttgart, Germany                             |
|Phone: (+49) 711-121-1434  FAX: (+49) 711-634856                      |
|Email: Michael.Paus@ifr.luftfahrt.uni-stuttgart.de (NeXT-Mail welcome)|

Re: GNAT and Command Line Arguments

[Robert Dewar]

first, the usual reminder, if you want to ask questions about gnat, be sure
to at least copy them to gnat-report, where the gnat team stands ready to
help, but can only help if it sees the questions!

as to the particular question, there is a defined command line package in
Ada 9X. THe easiest way for you to get the spec is to look at file
a-comlin.ads in your GNAT library which has a copy of the spec which is 
quite well commented, and should be adeqaute for your purposes.

Re: GNAT and Command Line Arguments

[Robb Nebbe]

In article <383amh$95h@hp-col.col.hp.com>, jimr@col.hp.com (Jim Rogers) writes:

|> 
|> My current question:
|> 
|> How do I write an Ada program so that I can pass file names in from the
|> UNIX command line?  I am running GNAT under HPUX.
|> 

The relevant functions from Ada.Command_Line are the following:

  function Argument_Count return Natural;

  function Argument( Number : in Positive ) return String;

  function Command_Name return String;

A loop printing out all the command line arguments would be:

  for Index in 1 .. Argument_Count loop
    Text_IO.Put_Line( Argument( Index ));
  end loop;

The interface is a little cleaner than what you get in C since
the command name, which a system may or may not provide, is not
considered as one of the arguments.

- Robb Nebbe