Groups > comp.sys.acorn.programmer > #6599

OS_File question

From	Bob Latham <bob@sick-of-spam.invalid>
Newsgroups	comp.sys.acorn.programmer
Subject	OS_File question
Date	2026-02-23 11:40 +0000
Organization	None
Message-ID	<5cafa1143ebob@sick-of-spam.invalid> (permalink)

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I would like to understand what this means...

It's from PRM OS_File 13.


If R0=13
 R4 = pointer to control-character terminated comma separated path
string.

What does that mean? I can find no examples anywhere.


I have no problem with OS_File 17, I've used it for years but 13 I
just can't work out what I'm doing wrong but work for me it does not.


I read this as R4 points to a path to a directory terminated by zero.
R1 points to a file name, zero terminated.
So I expect this to look for the file in that directory but it
doesn't.
And what have commas got to do with it?


Thanks for your help.

Bob.

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Thread

OS_File question Bob Latham <bob@sick-of-spam.invalid> - 2026-02-23 11:40 +0000
  Re: OS_File question Martin <News04@avisoft.f9.co.uk> - 2026-02-23 12:33 +0000
    Re: OS_File question Theo <theom+news@chiark.greenend.org.uk> - 2026-02-23 13:20 +0000
      Re: OS_File question Martin <News04@avisoft.f9.co.uk> - 2026-02-23 14:13 +0000
      Re: OS_File question Bob Latham <bob@sick-of-spam.invalid> - 2026-02-23 14:22 +0000
    Re: OS_File question Bob Latham <bob@sick-of-spam.invalid> - 2026-02-23 14:15 +0000

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