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From: "G.B." <bauhaus@futureapps.invalid>
Newsgroups: comp.lang.ada
Subject: Re: Operating System differences and Ada OS independent programming
Date: Thu, 24 Mar 2016 11:41:20 +0100
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Date: 2016-03-24T11:41:20+01:00
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On 24.03.16 09:00, Dmitry A. Kazakov wrote:
> The mapping is normally predefined. E.g. when you run MinGW, Windows
> roots are already mapped:
>
>     E:\  -> /e/

Enter a microcontroller with both a flash drive attached and
some other storage connected via network. Not much of
an operating system, yet a simple, single-threaded hierarchical
file system for the flash drive.

Then, when porting a prototype version of a program from
Windows™ to the controller, I thought that the programmer,
or "operator", should be able to instruct the run-time that

- "E:\" should be mapped to something that represents the "root"
of the filesystem on the flash drive, and

- %HOMEDRIVE% be mapped to the network attached thing,

- %HOMEPATH% to below what %HOMEDRIVE% has become.

If the program was developed without many features required
of the file system, then the source text that names files
would not need to be recompiled by any configurable implementation
of Ada.