Subject: Re: Apple ][ Programming Question....
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From: Wulf Hofbauer <wh@echo.chem.tu-berlin.de>
Newsgroups: comp.sys.apple2.programmer
Date: Mon, 26 Jul 1999 23:27:27 -0400
Organization: Technical University Berlin, Germany
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phoenyx wrote:
> In Aztec the path variable is found with the getenv call. How is this
> done in HyperC. I know about the calls which read the command
> line and getting the path from the command line but I've not seen
> anything similiar to the getenv function.
> I know these things could be coded for the system but you would
> need a common place to store them in memory. It's just nicer
> if the system supports them already. Don't get me wrong, I like
> HyperC, even the version with it's own OS. I would like to get the
> details for how that OS stores directories and does disk reads.

I don't remember the exact memory locations off my head - take a look at
the library (headers & symbol definitions in sysvars.o or something like
that). Most system variables are stored on page 3; there are also
several string buffers in the $2xx-$3xx range for the shell path,
command search path, etc. Yep, there's no getenv() & friends.

The C library maps I/O stuff to standard ProDOS calls (for files on
block devices), but implements its own routines for character devices
like the console (as ProDOS doesn't have a notion of these). The file
descriptors for character devices take different values than those for
ProDOS files, and the filenames are also disjunct, so it's easy to keep
them apart - in fact, you can print a file by just copying it to the
printer file (usually /1).

- Wulf