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Date: Mon, 2 Nov 2015 16:47:44 -0800 (PST)
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Subject: Re: Help with constructing an Ada Shell
From: Nick Gordon <annihilan@gmail.com>
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Xref: news.eternal-september.org comp.lang.ada:28184
Date: 2015-11-02T16:47:44-08:00
List-Id: <comp.lang.ada>

On Friday, October 30, 2015 at 3:37:46 AM UTC-5, Jacob Sparre Andersen wrot=
e:
> annihilan@gmail.com writes:
>=20
> >    Input : aliased String :=3D (1 .. 255 =3D> ' ');
>=20
> > 	 IO.Get_Line(Input, Last);
>=20
> >       Spawn (Program_Name =3D> Input, -- truncate strings or Input(Inpu=
t'First..Last)??
>=20
> > No matter what command is passed at the prompt, a return value of 1 is
> > given.=20
>=20
> Have you tried passing a command whose name is exactly 255 characters
> long?
>=20
> > I would massively appreciate any help that could be given to me. I
> > don't really have any clue at all what's going on.
>=20
> "Global" variables, which aren't really about maintaining state, are
> generally a bad idea.
>=20
> Why don't you give Execute_System the profile:
>=20
>    function Execute_System (Program : in String) return Integer;
>=20
> If GNAT.OS_Lib.Spawn wants access types as parameters, you can always
> allocate a copy on the heap inside Execute_System and pass the access to
> the copy to GNAT.OS_Lib.Spawn.
>=20
> Greetings,
>=20
> Jacob
> --=20
>                       CAUTION
>                BLADE EXTREMELY SHARP
>                 KEEP OUT OF CHILDREN

The idea of copying the string to the heap and using the copy is sort of wh=
at I was going for. I haven't had the time to figure out how exactly to all=
ocate a copy to the function's heap, but I'm currently working that out. I'=
ll report back after I figure this out. Thanks to you and the others for th=
e help.