general • Re: How to change directory - in a program

My searching has failed me so-far, but what I'm after is the magic runes to change a directory from inside a program and by this I really mean some sort of OSxxxx call rather than an OSCLI *DIR ... type of thing.

I'd like some sort of system call as I really want to capture any errors that might happen (e.g. not found) rather than having a message printed. OSCLI doesn't appear to return any code, error or otherwise.

There isn't a subcall. To change directory you do OSCLI "DIR "+dirname$.

To capture errors you use ON ERROR or the machine code equivalent. A message will only be printed if your error handler prints a message.

And yet:

https://beebwiki.mdfs.net/OSCLI

says:

On exit: undefined

So what gives? How can/does it return any form of error code? (Other than landing on a BRK on the 6502 side)

Or, maybe I just don't know how to trap an error on the Native ARM (yet). I can trap BRK on the 6502 side, but what about on e.g. an application running under e.g. Panos on the 32016? (The closest analogy to what I ultimately want to do)

I feel I'm right in the middle of the situation where I don't know what I don't know and I can't find the documentation.

-Gordon

Statistics: Posted by gordonDrogon — Tue May 07, 2024 10:30 pm

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