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How do I navigate Sparta Dos subdirectories in Assembler?


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Hello all,

 

I'm sorry if this has been explaied before but I am unable to find this in the SDX manuals or in the forum.

 

I have an application where I list a directory and call files. Working fine in SpartaDos. But how can I imply moving into sparta Dos subdirectories?

 

My application was written based on Dos2.5 first. I open the directory, read in all enties and save the 8 characters of each filename into a list for later call.

Turned out it works fine with SDX as well.

 

But how do I even recognize SDX subdirectory entires? They do not show at all with my method.

 

Right now I have to go back to Dos, type CD <subdirectory> and restart my application to acces those subdirectories. I would like to imply Dir changes in my code.

 

Seems I need a method to get a list of available subdirectory names and some code to navigate between directories.

 

Can anyone help me here?

 

 

 

 

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6.3.13 Change Current Directory (CHDIR)
Purpose
Change the current working directory of a disk.
Syntax
XIO 44,#IOCB,0,0,"Dd:path"
Remarks
This will change the directory that is used when the specified drive is accessed without
reference to a specific directory. The rules regarding path and IOCB status defined in
XIO 42 apply here

XIO 44,#3,0,0,"DX:SUBDIR1"

XIO 44,#3,0,0,"DX:<SUBDIR2"

 

or something similar. check the sdx manual again and search for XIO

Edited by rdea6
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XIO is a standard CIO call e.g. XIO <cmd>,#<iocb>,<aux1>,<aux2>,<fspec>

Usually "Special" command is assumed when using this in Basic. The difference between special commands and the normal range of GET/PUT types is that the IOCB doesn't need to be already opened for the special commands to work.

 

From assembly POV:

Store byte <cmd> into ICCOM

<iocb> as usual passed in X register (multiplied by 16)

<aux1/2> auxilliary byte #1 and #2 values into ICAX1/2

<fspec> device/file specification, as per procedure if issuing an OPEN command. Filespec is only needed if the IOCB isn't already opened to the required device.

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Thanks guys for your hints so far!

 

OK, so I open a directory with command icax1=6 and icax2=0 (SDX short format) and filespec *.* and read in all the Dir entries and store them in memory.

Some of them are files, some of them are directory names.

How can I tell which are the directories so that I can mark them accordingly in my listup and to correctly apply a directory change instead of loading the file when called?

I guess there's a marker bit somewhere in the entry but I cant find it in the Sparta Dos description at first glance.. (I've got a headcold right now and can't concentrate well so I just can't be bothered.. )

 

It will take me a bit of trying and analysing to figure it out but if you guys can tell me in one brief sentence I would greatly appreciate :-)

Edited by bugbiter
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Thanks guys! My BGP Picture viewer can now recognize subdirectory names in the Directory list and marks them up with brackets.

 

No to the actual change of the working path:

 

XIO 44,#IOCB,0,0,"Dd:path" - Does that mean that I always have to keep track and spell out the whole path?

 

Or may I just put in the subdirectory name? And how can I do a 'CD ..' in assembler to get one level up?

Do I need to delete the last name in the path string and put it in the xio 44 call? Is there an easier way?

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The path is relative to the current working directory unless it begins with a ">" or "\" immediately following the device ID (i.e. after "Dn:"). So if the current working directory is "TEST", you may CWD to a directory inside of "TEST" by omitting the leading path delimiter.

 

To back up one level, "XIO 44,#IOCB,0,0,"Dn:<") will do (you may use "..\" instead if you wish).

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