[patch] Add Logging Support for SID Components

[Dave Brolley]

Frank Ch. Eigler wrote:

>The new version seems to have at least one actual problem though:
>the way that the buffer array is managed.  Its allocation/deallocation
>strategy should be consistent (probably "new char[]" and "delete[] char")
>regardless of the availability of the various *sprintf variants.  It should
>probably not even be in #if/#endif markers.  The new code appears to be
>able to hit free() even though malloc() was never called.
>  
>
The piece of information that you're probably missing is that vasprintf 
automatically allocates a buffer of the proper size each time it is 
called and it uses malloc. Thus free () is only called when using 
vasprintf (! HAVE_VSNPRINTF && HAVE_VASPRINTF). Otherwise 
(HAVE_VSNPRINTF || ! HAVE_VAPRINTF) a persistent buffer is used  which 
can be grown if necessary only when vsnprintf is used. I chose to use 
new/delete here since I had a choice.

I have reviewed the code again and believe that it is correct. I can get 
the call to free() out of #if/#endif if I allocate a buffer everytime 
for all alternatives using malloc, but conditional compilation would 
still be necessary for the allocations/growth.

Let me know if you feel these changes are necessary.

Thanks,
Dave