Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!cs.utexas.edu!uunet!recondo!sirius
From: sirius@recondo.UUCP (Michael Stilson)
Newsgroups: comp.sys.amiga.tech
Subject: Re: InfoData->id_VolumeNode->ln_Name ??
Message-ID: <0363.AA0363@recondo>
Date: 9 May 89 05:03:17 GMT
References: <0285.AA0285@recondo> <24171@agate.BERKELY.EDU>
Distribution: usa
Organization: Is the Root of All Evil.
Lines: 63

In article: <24171@agate.BERKELY.EDU> c60c-1ea@WEB.Berkely.Edu writes:
>In article <0285.AA0285@recondo> sirius@recondo.UUCP (Michael Stilson) writes:
>>Subject: Re: InfoData->id_VolumeNode->ln_Name ??
>					^
>  As far as I know, id_VolumeNode points (via BCPL conventions) to a
>DeviceNode structure, not an exec Node structure.  You're undoubtedly going
>to the wrong place with your dereferencing.  I'm suprised you never Guru'd
>with 000...003.xxx...xxx  ...  :-)

Maybe it felt sorry for me.. I had 12 Software Error-Task Held's on the screen
at once today..  Although it DID cause Gomf to yell a little bit now & again.

(I did do the proper casting, etc..  and I WILL say the results were.. 
Interesting, to say the least.. :-)

I started doing it through a DosNode, but (at the time) it seemed to me that
it could be found from the InfoData pointer, rather than having to incorporate
yet another structure.. 


Here's the section of code that gets the name of the volume.  If anyone knows
a better way, feel free to suggest it.

----
#define B_TO_C(cast,var) ((struct cast *)(BADDR((ULONG)var)))

char *GetName(Var)
struct Variables *Var;
{

	Forbid();

		Var->lock = B_TO_C(FileLock, Var->mylock);
		Var->dev = B_TO_C(DeviceList, Var->lock->fl_Volume);
		Var->temp = (char *)BADDR(Var->dev->dl_Name);
	        strncpy(Var->name, &Var->temp[1], Var->temp[0]);
		Var->name[Var->temp[0]] = NULL;

	Permit();

	return(Var->name);
}
----

That's how I tried it first, and it worked...  Then I decided to start messing
with success...

>>... or am I missing something really obvious here?
>  Yes.
Somehow, I find that very easy to believe :)


Thanks...   Mike.

--
--

              Mike 'Sirius' Stilson      -      Sirius Software
                                sirius@recondo.UUCP
                              ..!uunet!recondo!sirius
                         (412) 793-1242 or (412) 793-5765
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