[PATCH 1/2] telemetry: use malloc instead of variable length array

[Stephen Hemminger]

On Wed, 5 Apr 2023 18:30:51 +0300
Dmitry Kozlyuk <dmitry.kozliuk at gmail.com> wrote:

> 2023-04-05 08:25 (UTC-0700), Tyler Retzlaff:
> > On Wed, Apr 05, 2023 at 09:54:46AM +0100, Bruce Richardson wrote:  
> > > On Tue, Apr 04, 2023 at 06:04:32PM -0700, Stephen Hemminger wrote:    
> > > > On Tue, 4 Apr 2023 09:47:21 +0100
> > > > Bruce Richardson <bruce.richardson at intel.com> wrote:
> > > >     
> > > > > My suggestion is to use a combination of these methods. In json_snprintf
> > > > > check if the input buffer is empty or has only one character in it, and use
> > > > > method #2 if so. If that's not the case, then fallback to method #1 and do
> > > > > a double snprintf.
> > > > > 
> > > > > Make sense? Any other suggestions?    
> > > > 
> > > > Glibc has asprintf which allocates the buffer for you.    
> > > 
> > > Good point, I'll use that in any new implementation. Thanks.    
> > 
> > i imagine there is an equivalent to asprintf for windows but keep in
> > mind it is not standard C so you'll have to do something conditional.  
> 
> There's eal_asprintf() shim in EAL,
> we could make it internal to reuse in telemetry.

Windows has tools necessary to build asprint equivalent.

See: https://github.com/eiszapfen2000/asprintf