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From: Chris Townley <news@cct-net.co.uk>
Newsgroups: comp.lang.ada
Subject: Re: Using "pure" (?) Ada, how to determine whether a file is a "text"
 file, not a binary?
Date: Sun, 2 Jul 2023 02:08:17 +0100
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On 01/07/2023 22:50, Kenneth Wolcott wrote:
> On Saturday, July 1, 2023 at 2:39:06 PM UTC-7, Keith Thompson wrote:
>> Kenneth Wolcott writes:
>>> On Saturday, July 1, 2023 at 1:39:30 PM UTC-7, Jeffrey R.Carter wrote:
>>>> On 2023-07-01 19:15, Kenneth Wolcott wrote:
>> [...]
>>>> For example, if a text file is one in which all the characters, except line
>>>> terminators, are graphic characters, then it should be clear how to determine
>>>> whether a file meets that definition of a text file.
>>>
>>> I think that is the definition that I'm going to pursue as the
>>> simplest and effective definition.
>> Think about how you want to handle tab characters (non-graphic but
>> common in some text) and carriage return characters (non-graphic but
>> part of a line terminator for Windows-style text files).
>>
>> Also think about the various ways of representing text: ASCII, Latin-1,
>> UTF-8, UTF-16, etc.
> 
> Thanks, Keith!
> 
> It looks like just need to more carefully examine the existing Ada I/O packages and experiment with the possibilities...
> 
> Ken

Maybe worth looking at the unix file utility, docs and source are available
-- 
Chris