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range: add min/max operations on ranges

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Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Michael S. Tsirkin 2013-09-02 11:04:39 +03:00
parent cfe25e2bca
commit c5a22c4344
1 changed files with 18 additions and 0 deletions
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18
include/qemu/range.h
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@ -17,6 +17,24 @@ 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)
{
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;
}
/* Compare last byte in case region ends at ~0x0LL */
if (range->end - 1 < extend_by->end - 1) {
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)