On Wed, 4 Sep 2013 13:48:35 +0300
"Michael S. Tsirkin" <m...@redhat.com> wrote:
> Signed-off-by: Michael S. Tsirkin <m...@redhat.com>
> ---
> include/qemu/range.h | 17 +++++++++++++++++
> 1 file changed, 17 insertions(+)
>
> diff --git a/include/qemu/range.h b/include/qemu/range.h
> index 4a0780d..1c688ca 100644
> --- a/include/qemu/range.h
> +++ b/include/qemu/range.h
> @@ -17,6 +17,23 @@ struct Range {
> uint64_t end; /* 1 + the last byte. 0 if range empty or ends at
> ~0x0LL. */
> };
>
> +static inline void range_extend(Range *range, Range *extend_by)
doc comment what it does pls.
> +{
> + if (!extend_by->begin && !extend_by->end) {
> + return;
> + }
> + if (!range->begin && !range->end) {
> + *range = *extend_by;
> + return;
> + }
> + if (range->begin > extend_by->begin) {
> + range->begin = extend_by->begin;
> + }
> + if (range->end - 1 < extend_by->end - 1) {
(foo)->end could be 0 at this point leading to overflow when subtracted,
is it intended to be so?
> + range->end = extend_by->end;
> + }
> +}
> +
> /* Get last byte of a range from offset + length.
> * Undefined for ranges that wrap around 0. */
> static inline uint64_t range_get_last(uint64_t offset, uint64_t len)
