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From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Subject: Re: Ada.Command_Line and wildcards
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Date: Mon, 26 Feb 2007 09:44:16 +0100
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Date: 2007-02-26T09:44:16+01:00
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On Mon, 26 Feb 2007 05:03:26 GMT, Hyman Rosen wrote:

> Dmitry A. Kazakov wrote:
>> Get_Line should propagate an exception which could be handled in a
>> reasonable way.
> 
> That's not really good enough. That is, your program is to going to
> tell you "I can't do that" when you ask "give me the next line".
> Fine, you're not crashing, but you really want that line!

There are numerous other reasons why Get_Line might fail. So you cannot
"really" want it, only conditionally.
 
> There ought to be a Get_Line which returns an Unbounded_String (did
> I get that right?), so that space for it comes from the heap instead
> of the stack.

Which can fail either.

Further, why do you presume that heap is larger than stack? AFAIK, nothing
in RM requires or implies that.

> And yes, I know it's a security issue because someone
> can feed the program unbounded input and have it chew up large chunks
> of RAM, but sometimes you really do need unbounded lengths on your
> input lines.

That depends on the underlying OS and its resources sharing schema.
Theoretically, it is not the programmer's business, but practically, yes,
it is a DoS concern.

-- 
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de