Path: utzoo!utgpu!attcan!uunet!mcvax!hp4nl!philmds!leo
From: leo@philmds.UUCP (Leo de Wit)
Newsgroups: comp.sys.atari.st
Subject: Re: Fsfirst/Fsnext question
Message-ID: <623@philmds.UUCP>
Date: 26 Aug 88 05:17:41 GMT
References: <566@laura.UUCP>
Reply-To: leo@philmds.UUCP (Leo de Wit)
Organization: Philips I&E DTS Eindhoven
Lines: 28

In article <566@laura.UUCP> klute@trillian.UUCP (Rainer Klute) writes:
|Hello ST-hackers,
| 
|does anyone know about a 'legal' way to do something like this:
| 
| 
|Routine_A:                    Routine_B:
|==========                    ==========
|Fsfirst (...);                 .
|Fsnext ();                     .
| .                            Fsfirst (...);
| .                            Fsnext ();
|Call_Routine_B ();             .
| .                             .
| .                            return;
|Fsnext ();

Use Fsetdta(dtabuf); just before each invocation of either Fsfirst() or
Fsnext(); GEMDOS uses the first 21 bytes of the DTA-buffer to keep
track.  There is little overhead in the use of this GEMDOS call, since
it merely sets a pointer to 'dtabuf' in the basepage (you could even do
it yourself 8-).  Of course Routine_A and Routine_B should each use
their own 'dtabuf'.  Note that this 44-byte buffer must be
word-aligned.
I thought that the default DTA-buffer (i.e. if your program does not
set it) is at basepage + 0x80 (yes, writing over your argument string 8-).

                         Leo.