On Tue, 15 Dec 2020 23:27:55 +0100, Stefan Sperling wrote:

> Sure. It seems like we'll more flexibility when building error messages
> and this is probably the easiest way to go about it.
>
> This adds an errno-specific interface, meaning it always appends the
> result of strerror(3) to the provided format string.

I wouldn't make buf static since it doesn't need to exist after
the function returns.  Otherwise OK.

 - todd