[libvirt] [RFC PATCH 1/6] util: Add API for converting virBitmap into printable string
Jiri Denemark
jdenemar at redhat.com
Thu Feb 10 10:08:50 UTC 2011
> > + for ( ; sz > 0; sz--)
> > + virBufferVSprintf(&buf, "%08x", bitmap->map[sz - 1]);
>
> I probably would have written:
>
> while (sz--)
> virBufferVSprintf(&buf, "%08x", bitmap->map[sz]);
Yeah, it looks nicer; I'll use that since I'll send a new version anyway.
> since sz is guaranteed to be non-zero to start with. But your way
> works, and the compiler (hopefully) generates the same code (when
> optimizing).
Not that this is in a performance critical path requiring any optimizations
:-)
> Problem - "%08x" is not portable. bitmap->map[x] is a uint32_t, which
> means we need to use "%08"PRIx32 (since some platforms declare uint32_t
> as long rather than int) to avoid a gcc warning.
Ah, thanks for spotting that. I always forget about this dark side of C.
> For that matter, why did we make the bitset use uint32_t as the
> underlying type, instead of just using long?
Right, I'll fix that first followed by a v2 of this patch.
Jirka
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