RE: named structure members

["Mariano Moreyra" <moremari@aca.org.ar>]

Hi Matthew,
First of all, I couldn't install the Inventory. I don't know why the
configure script throws me an error.
But looking at the sources:
 - Like I said yesterday, if you define db_host as a "char *db_host "
instead of
   "char db_host[NN]" you have to alloc some memory to that string before
the strcpy

But you told me that you had it defined like "char db_host[NN]" and already
had that segfault...am I right??

-----Mensaje original-----
De: linux-c-programming-owner@vger.kernel.org
[mailto:linux-c-programming-owner@vger.kernel.org]En nombre de Matthew
Harrison
Enviado el: Jueves, 11 de Septiembre de 2003 14:13
Para: linux-c-programming@vger.kernel.org
Asunto: Re: named structure members


i am going thru all these suggestions at a slow rate, but it's time
to finish work now so I won't be able to reply from home.

please don't think i'm ignoring you, i am very grateful.

On Thu, Sep 11, 2003 at 06:52:13PM +0200, Jan-Benedict Glaw wrote:
> On Thu, 2003-09-11 16:50:05 +0100, Glynn Clements
<glynn.clements@virgin.net>
> wrote in message <16224.39341.204427.234601@cerise.nosuchdomain.co.uk>:
> > Matthew Harrison wrote:
> > > here is the struct that i want my config to go into:
> > There are a number of ways which you could improve upon this, but
> > there isn't anything along the lines of:
> >
> > 	config.<something involving "keyword"> = value;
> >
> > Structure fields have to be specified explicitly; you can't "index" a
> > structure in the manner of an associative array.
> >
> > One possible solution is:
> >
> > enum cfg_option {
> > 	cfg_db_host,
> > 	cfg_db_name,
> > 	cfg_db_pass,
> > 	cfg_db_user,
> > 	CFG_COUNT
> > };
> [...]
> Another approach is to use a union (containing any possible things, in
> your case only char pointers) inside a struct (which also contains a
> char name[] and an int type). Build up an array with these structs, one
> for each config option.
>
> Then have a function which gets on option name as well as an option
> value which searches throuch all ->name's of your array and assigns the
> (properly converted) value to the proper union type.
>
> To access these options, use multiple access functions (ie.
>
> int get_int(char *option)
>
> ) which also searches through the array and returns the int part of the
> union.
>
> MfG, JBG
>
> --
>    Jan-Benedict Glaw       jbglaw@lug-owl.de    . +49-172-7608481
>    "Eine Freie Meinung in  einem Freien Kopf    | Gegen Zensur | Gegen
Krieg
>     fuer einen Freien Staat voll Freier Bürger" | im Internet! |   im
Irak!
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--
Mat Harrison
Technical Developer
3d Computer Systems Ltd.
matth@3d-computers.co.uk

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