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broadblues
What is the correct tecnique to determine if two files are on the same volume under AmigaOS 4.x?
Posted on: 2014/3/2 23:47    #1
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I need to upgrade a function in a project I'm working on to AmigaOS 4.

This is the old code.

static BOOL OnSameVolume(STRPTR fname1, STRPTR fname2)
{
    struct InfoData __aligned idata;
    struct DeviceList *dlist1, *dlist2;
    BPTR lock;

    dlist1 = dlist2 = NULL;
    if (lock = Lock(fname1, ACCESS_READ)) {
        if (Info(lock, &idata))
            dlist1 = BADDR(idata.id_VolumeNode);
        UnLock(lock);
    }
    if (lock = Lock(fname2, ACCESS_READ)) {
        if (Info(lock, &idata))
            dlist2 = BADDR(idata.id_VolumeNode);
        UnLock(lock);
    }
    if (dlist1 && dlist2)
        return((BOOL)(dlist1->dl_Task == dlist2->dl_Task && dlist1->dl_Name == dlist2->dl_Name));
    else
        return(FALSE);
}


as struct DeviceList is now in dos/obsolete.h I'm wonder what the correct way to do the above is under AmigaOS 4?
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joerg
Re: What is the correct tecnique to determine if two files are on the same volume under AmigaOS 4.x?
Posted on: 2014/3/3 1:35    #2
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@broadblues

Quote:
I need to upgrade a function in a project I'm working on to AmigaOS 4.

This is the old code.
Not just old, ancient Kickstart 1.x code

Since AmigaOS 2.0 it's something like
static BOOL OnSameVolume(STRPTR fname1, STRPTR fname2) 
{ 
    BPTR lock1, lock2;
    BOOL result = FALSE;

    lock1 = IDOS->Lock(fname1, ACCESS_READ);
    lock2 = IDOS->Lock(fname2, ACCESS_READ);

    if (lock1 && lock2)
    {
       int32 same = IDOS->SameLock(lock1, lock2);
       if (LOCK_SAME == same || LOCK_SAME_VOLUME == same)
       {
          result = TRUE;
       }
    }
    
    if (lock1) IDOS->UnLock(lock1);
    if (lock2) IDOS->UnLock(lock2);

    return result;
}


Edited by joerg on 2014/3/3 1:55:31
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broadblues
Re: What is the correct tecnique to determine if two files are on the same volume under AmigaOS 4.x?
Posted on: 2014/3/3 11:05    #3
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@joerg

Quote:

Not just old, ancient Kickstart 1.x code


This thing I'm working on has ancient roots!


Thanks for the solution.

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salass00
Re: What is the correct tecnique to determine if two files are on the same volume under AmigaOS 4.x?
Posted on: 2014/3/3 11:20    #4
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@broadblues

Quote:

as struct DeviceList is now in dos/obsolete.h I'm wonder what the correct way to do the above is under AmigaOS 4?


The DeviceList struct was moved to dos/obsolete.h because it's the same as struct VolumeNode only with a less logical name.

Quoting from the dos/obsolete.h include:
Quote:

Obsolete structure definition, although called a "devicelist" it was actually used only for volume nodes, how quaint !.
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broadblues
Re: What is the correct tecnique to determine if two files are on the same volume under AmigaOS 4.x?
Posted on: 2014/3/3 11:32    #5
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@Salass00

Noted: but even if I had realised that before asking the question, the dl_Task entry referenced in the old code, doesn't exist in the 4.x includes. (presumably it was either FSPrivate or one of the reserved.

Best to update either way.
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salass00
Re: What is the correct tecnique to determine if two files are on the same volume under AmigaOS 4.x?
Posted on: 2014/3/3 11:40    #6
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@broadblues

Quote:

Noted: but even if I had realised that before asking the question, the dl_Task entry referenced in the old code, doesn't exist in the 4.x includes. (presumably it was either FSPrivate or one of the reserved.


The #?_Task fields in DosList, VolumeNode, DeviceNode, etc. structs are now called #?_Port. The old, obsolete names never made much sense since they point to the filesystem message port or FSVP in case of newer filesystems, not a Task structure.

Also, from dos/obsolete.h:
Quote:

#define dl_Task dl_Port


The equivalent in struct VolumeNode is of course "vn_Port".
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