Using Text_Io.Open

Using Text_Io.Open

[AA HOLMES]

Hello. I'm a student studying Ada in a Unix enviroment.
When you open files using Text_Io.Open command you can specify a path name
for the file. Unfortunatly I want to use the '~' to specify the directory
/home/(user) 
user been the users login name. So far I have to recompile the source
everytime Someone asks for a copy of my program.
So for example if someone with login name psdrayto asked for a copy, I
would have to change the file name to /home/psdrayto/config and then
recompile. Is there a way to use system Variables or shortcuts in Ada ?

Aidan.

Re: Using Text_Io.Open

[Tarjei T. Jensen]

AA HOLMES wrote:
> 
> Hello. I'm a student studying Ada in a Unix enviroment.
> When you open files using Text_Io.Open command you can specify a path name
> for the file. Unfortunatly I want to use the '~' to specify the directory
> /home/(user)
> user been the users login name. So far I have to recompile the source
> everytime Someone asks for a copy of my program.
> So for example if someone with login name psdrayto asked for a copy, I
> would have to change the file name to /home/psdrayto/config and then
> recompile. Is there a way to use system Variables or shortcuts in Ada ?
> 

I belive that with GNAT command line stuff has an extension that allows
you to have a look at environment variables. I belive that ACT has some
online documentation at http://www.gnat.com.

If I'm wrong about the documentation the compiler and some documentation
is available from ftp://cs.nyu.edu/pub/gnat.


Greetings,

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// Tarjei T. Jensen 
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Re: Using Text_Io.Open

[David Weller]

In article <Pine.GSO.3.95.971110170857.578D-100000@dcsun4.comp.brad.ac.uk>,
AA HOLMES  <aaholmes@comp.brad.ac.uk> wrote:
>Hello. I'm a student studying Ada in a Unix enviroment.
>When you open files using Text_Io.Open command you can specify a path name
>for the file. Unfortunatly I want to use the '~' to specify the directory
>/home/(user) 
>user been the users login name. So far I have to recompile the source
>everytime Someone asks for a copy of my program.

Remember that things like ~ and $HOME are unique to the shells you're
using.  These features are non-portable to OS platforms like
Microsoft.  You should look at the vendor-supplied libraries.  If
you're using GNAT, you can use the routine supplied in GNAT.IO_Aux.
Although I hasten to add that you may still have to explicitly expand
the shell symbol.

Good luck!
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