Re: named structure members

[Matthew Harrison <matth@3d-computers.co.uk>]

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my mistake, i'm always doing that. 

lets try this one :)

On Fri, Sep 12, 2003 at 10:52:54AM -0300, Mariano Moreyra wrote:
> It seems like there is no attached version :)
> 
> 
> -----Mensaje original-----
> De: Matthew Harrison [mailto:matth@3d-computers.co.uk]
> Enviado el: Viernes, 12 de Septiembre de 2003 10:47
> Para: Mariano Moreyra
> CC: linux-c-programming@vger.kernel.org
> Asunto: Re: named structure members
> 
> 
> well it's all changed a bit now. i have been learning how to use gdb
> and as a result have managed to replace the strcpy's and other bit that
> cause segfaults. The app now runs cleanly but i am running into trouble
> with my config-file-reading function. it was not my function, i copied
> it off the web so i might just write myself a quick one.
> 
> attached is a version that should not segfault and only stops working
> because the configfile isn't read properly.
> 
> what part if the configure script did you have trouble with.
> 
> thanks
> 
> On Fri, Sep 12, 2003 at 10:22:40AM -0300, Mariano Moreyra wrote:
> > 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!
> > >       ret = do_actions((curr | FREE_SPEECH) & ~(IRAQ_WAR_2 | DRM |
> TCPA));
> >
> >
> >
> > --
> > Mat Harrison
> > Technical Developer
> > 3d Computer Systems Ltd.
> > matth@3d-computers.co.uk
> >
> > -
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> 
> -- 
> Mat Harrison
> Technical Developer
> 3d Computer Systems Ltd.
> matth@3d-computers.co.uk

-- 
Mat Harrison
Technical Developer
3d Computer Systems Ltd.
matth@3d-computers.co.uk

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