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[Qemu-devel] [PULL 03/14] range: add min/max operations on ranges


From: Michael S. Tsirkin
Subject: [Qemu-devel] [PULL 03/14] range: add min/max operations on ranges
Date: Sun, 29 Sep 2013 09:59:58 +0300

Signed-off-by: Michael S. Tsirkin <address@hidden>
---
 include/qemu/range.h | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

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)
-- 
MST




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