[Minios-devel] [UNIKRAFT PATCH 1/5] include/essentials: Introduce range test macros

[Simon Kuenzer <simon.kuenzer@xxxxxxxxx>]

Introduce macros to test if:
- a value is part of a number range
- two ranges are overlapping

Signed-off-by: Simon Kuenzer <simon.kuenzer@xxxxxxxxx>
---
 include/uk/essentials.h | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/include/uk/essentials.h b/include/uk/essentials.h
index d9b24fcb..f20245b4 100644
--- a/include/uk/essentials.h
+++ b/include/uk/essentials.h
@@ -195,6 +195,26 @@ extern "C" {
 #define ALIGN_DOWN(v, a) ((v) & ~((a)-1))
 #endif
 
+/**
+ * Tests if `val` is part of the range defined by `base` and `len`
+ */
+#define IN_RANGE(val, base, len)                       \
+       (((val) >= (base)) && ((val) < (base) + (len)))
+
+/**
+ * Tests if two ranges overlap
+ * This is the case when at least one of the following conditions is true:
+ *  - The start of range 1 is within range 0
+ *  - The end of range 1 is within range 0
+ *  - The start of range 1 is smaller than the start of range 0 while
+ *    the end of range 1 is bigger than the end of range 0
+ */
+#define RANGE_OVERLAP(base0, len0, base1, len1)                                
\
+       (IN_RANGE((base1), (base0), (len0))                             \
+        || IN_RANGE((base1) + (len1), (base0), (len0))                 \
+        || (((base1) <= (base0))                                       \
+            && (((base1) + (len1)) >= ((base0) + (len0)))))
+
 #ifndef ARRAY_SIZE
 #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
 #endif
-- 
2.21.0


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