Re: [PATCH ps/stash-in-c] strbuf_vinsertf: provide the correct buffer size to vsnprintf

[Johannes Sixt <j6t@kdbg.org>]

Am 04.02.19 um 11:38 schrieb Johannes Schindelin:
> On Mon, 4 Feb 2019, Johannes Sixt wrote:
> 
>> Am 03.02.19 um 17:51 schrieb Johannes Sixt:
>>> strbuf_vinsertf inserts a formatted string in the middle of an existing
>>> strbuf value.
>>
>> Quite frankly, this is a really unusual operation, and I'd prefer to get
>> rid of it. There is only one call, and it looks like it only wants to be
>> lazy and save one strbuf variable.
> 
> The only reason why there are not more callers is that I did not convert
> any of the appropriate places. We have quite a few places where we
> allocate a new strbuf for the sole purpose of formatting something that is
> then inserted into an already existing strbuf (possibly extending the
> buffer, which might require a move of the buffer just because that
> temporary strbuf is in the way).
> 
> It does not sound like good practice to me to allocate things left and
> right, only to reallocate something that was just allocated anyway and to
> copy things into that and then release things left and right.

I prefer separation of concerns at the expense of a bit of resource
consumption that is not measurable. But that is the only argument that I
have.

-- Hannes