Re: [PATCH v2 1/1] vreportf(): avoid relying on stdio buffering

From: Alexandr Miloslavskiy <alexandr.miloslavskiy@syntevo.com>
Date: Oct 29, 2019, 20:11 UTC
Message-ID: <97291857-42a2-4865-b265-d55fcf131ba5@syntevo.com>
In-Reply-To: <nycvar.QRO.7.76.6.1910292049530.46@tvgsbejvaqbjf.bet>

On 29.10.2019 20:57, Johannes Schindelin wrote:

Show 5 quoted lines

> It is not entirely obvious to me what exactly you mean by "this",
> assuming that you refer to comparing two pointers via `<`, I agree that
> this is not the best idea, I changed it to `off < pend - msg`. If my
> assumption is correct, however, we are still talking about C, so I
> wonder how this C++ document you linked could bear any relevance:

The linked portion of text speaks about adding to pointer. The paragraph is a bit long and my quote was indeed hard to grasp. And yes, sorry, C++ habits. However, the same thing applies to C, let's have this link instead:

https://web.archive.org/web/20181230041359if_/http://www.open-std.org/jtc1/sc22/wg14/www/abq/c17_updated_proposed_fdis.pdf

Hopefully a better quote this time (c/c++ standard are hard to read for mortals like me):

When an expression that has integer type is added to or subtracted from a pointer <...> If both the pointer operand and the result point to elements of the same array object, or one past the last element of the array object, <...> otherwise, the behavior is undefined.

> Quite honestly, I purposefully refrained from copying that information.

That's a pity, I've put quite an effort into researching all that.