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authorMichael S. Tsirkin <mst@redhat.com>2013-09-02 11:04:39 +0300
committerMichael S. Tsirkin <mst@redhat.com>2013-09-15 11:49:50 +0300
commitc5a22c4344f17169bb20e122e9d935c62aedc063 (patch)
treecb0fc7a44a7a8fabe9e18e64f5c2e29d5d3d9dfe /include
parentcfe25e2bcada943984e27ee63918fd75dc4563ac (diff)
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range: add min/max operations on ranges
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Diffstat (limited to 'include')
-rw-r--r--include/qemu/range.h18
1 files changed, 18 insertions, 0 deletions
diff --git a/include/qemu/range.h b/include/qemu/range.h
index 4a0780d..aae9720 100644
--- a/include/qemu/range.h
+++ b/include/qemu/range.h
@@ -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)