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From: "Jeffrey R. Carter" <spam.jrcarter.not@spam.not.acm.org>
Newsgroups: comp.lang.ada
Subject: Re: Get_Immediate Hangs
Date: Wed, 30 Sep 2015 14:49:22 -0700
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Date: 2015-09-30T14:49:22-07:00
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On 09/30/2015 02:13 PM, Charles H. Sampson wrote:
> I'm getting a behavior from Get_Immediate that is not what I expect from
> the manual. I'm using the form
> 
>      Get_Immediate (Item : out Character; Available: out Boolean);
> 
> It does not return immediately (with Available = False) if no character
> is available. It does not return immediately (with Available = True) if
> a character is typed. It only returns (with Available = True) if one or
> more characters are typed followed by carriage return. In this case all
> of the typed characters are returned, one after the other, including the
> carriage return.
> 
> I'm using an ancient version of Gnat on an ancient Mac's Unix (Darwin).

Clearly your implementation ignores the implementation advice in ARM A.10.7(23)
and reads from a buffer, which is apparently only filled when the user presses
Enter. Not much you can do about that except use a different implementation.

-- 
Jeff Carter
"Don't knock masturbation. It's sex with someone I love."
Annie Hall
45