[Devel] Feature request: error/debug message extension.

[Stefano D'Angelo]

2012/1/15 Gabriel M. Beddingfield <gabrbedd at gmail.com>:
> From the very start, I've been fine with something like this:
>
>    format_string(s, BUFSIZE, "number = ?", (double)3);
>
> ...and if you want more control over the formatting then you need to bring
> your own.  This sort of thing is very easy to implement RT-safe.
>
> I'm *not* fine with requiring hosts to support something like this:
>
>    snprintf(s, BUFSIZE, "number = \\%-08.3g%%", (double)3);
>
> ...UNLESS there is an RT-safe implementation of snprintf() available
> somewhere.  (I'm even OK if the implementation actually ignores everything
> except the type that's given.)

If you want you can have fun with this
http://hg.atheme.org/naspro/file/463fdac9e424/naspro-core/src/string.c#l329

It's an (v)asprintf() implementation that only uses standard C stuff
and only performs the one necessary allocation (the output buffer, and
the size is exactly the needed size unlike glibc's asprintf()) - i.e.,
this can be easily turned into an RT-safe snprintf().

However I don't think producing log/debug messages from RT threads is
such a great idea in any case.

Stefano