getenv in Ada

getenv in Ada

[Fernando Tricas]

Hello, 

is there a procedure or function similar to getenv in Ada95? The idea of
this function is to check (in c and in unix) the value of an environment
variable.

Thank you,

Fernando Tricas

Re: getenv in Ada

[Corey Ashford]

Tom Moran wrote:
> 
> >is there a procedure or function similar to getenv in Ada95?
> No, since many Ada targets have no such thing as an "environment".
> But any compiler targetted to Unix or DOS or Windows probably supplies
> a getenv function or its equivalent in a library.  Look in your
> compiler documentation.

In particular, if your environment supplies the POSIX 1003.5 API,
you can use Posix_Process_Environment.Environment_Value_Of
to read an environment variable.

Cheers

- Corey

Re: getenv in Ada

[Tucker Taft]

Tom Moran (tmoran@bix.com) wrote:

: >is there a procedure or function similar to getenv in Ada95?

: No, since many Ada targets have no such thing as an "environment".
: But any compiler targetted to Unix or DOS or Windows probably supplies
: a getenv function or its equivalent in a library.  Look in your
: compiler documentation.

Or if you know the name of the function in your C library,
then just define an appropriate Ada subprogram spec for it and use 
pragma Import.  At link-time, make sure the appropriate
C library gets searched.

--
-Tucker Taft   stt@inmet.com   http://www.inmet.com/~stt/
Intermetrics, Inc.  Burlington, MA  USA
An AverStar Company

Re: getenv in Ada

[Keith Thompson]

stt@houdini.camb.inmet.com (Tucker Taft) writes:
> Tom Moran (tmoran@bix.com) wrote:
> 
> : >is there a procedure or function similar to getenv in Ada95?
> 
> : No, since many Ada targets have no such thing as an "environment".
> : But any compiler targetted to Unix or DOS or Windows probably supplies
> : a getenv function or its equivalent in a library.  Look in your
> : compiler documentation.
> 
> Or if you know the name of the function in your C library,
> then just define an appropriate Ada subprogram spec for it and use 
> pragma Import.  At link-time, make sure the appropriate
> C library gets searched.

Note that the getenv function is part of standard C, so any conforming
hosted C implementation must provide it by that name, though the
semantics are implementation-defined.  (A freestanding implementation
of C may or may not provide getenv.)

-- 
Keith Thompson (The_Other_Keith) kst@cts.com <http://www.ghoti.net/~kst> <*>
Qualcomm, San Diego, California, USA  <http://www.qualcomm.com>
I must be a techno-geek.  My mouse is bigger than my phone.

Re: getenv in Ada

[Tom Moran]

>is there a procedure or function similar to getenv in Ada95?
No, since many Ada targets have no such thing as an "environment".
But any compiler targetted to Unix or DOS or Windows probably supplies
a getenv function or its equivalent in a library.  Look in your
compiler documentation.