Re: [Qemu-devel] [PATCH RFC 1/4] log: Clean up misuse of Range for -dfilter

[Eric Blake <eblake@redhat.com>]

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On 06/15/2016 02:41 PM, Markus Armbruster wrote:
> Range encodes an integer interval [a,b] as { begin = a, end = b + 1 },
> where a \in [0,2^64-1] and b \in [1,2^64].  Thus, zero end is to be
> interpreted as 2^64.
> 
> The implementation of -dfilter (commit 3514552) uses Range
> differently: it encodes [a,b] as { begin = a, end = b }.  The code
> works, but it contradicts the specification of Range in range.h.
> 
> Switch to the specified representation.  Since it can't represent
> [0,UINT64_MAX], we have to reject that now.  Add a test for it.
> 
> While we're rejecting anyway: observe that we reject -dfilter LOB..UPB
> where LOB > UPB when UPB is zero, but happily create an empty Range
> when it isn't.  Reject it then, too, and add a test for it.
> 
> While there, add a positive test for the problematic upper bound
> UINT64_MAX.
> 
> Signed-off-by: Markus Armbruster <armbru@redhat.com>
> ---
>  tests/test-logging.c | 10 ++++++++++
>  util/log.c           | 28 +++++++++++++++-------------
>  2 files changed, 25 insertions(+), 13 deletions(-)
> 

Reviewed-by: Eric Blake <eblake@redhat.com>

-- 
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org


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