lib: utils_def: add CLAMP macro
Add the standard CLAMP macro. It ensures that
x is between the limits set by low and high.
If low is greater than high the result is undefined.
Signed-off-by: Lionel Debieve <lionel.debieve@st.com>
Change-Id: Ia173bb9ca51bc8d9a8ec573bbc15636a94f881f4
diff --git a/include/lib/utils_def.h b/include/lib/utils_def.h
index 35ae33a..23f59bd 100644
--- a/include/lib/utils_def.h
+++ b/include/lib/utils_def.h
@@ -77,6 +77,15 @@
_x > _y ? _x : _y; \
})
+#define CLAMP(x, min, max) __extension__ ({ \
+ __typeof__(x) _x = (x); \
+ __typeof__(min) _min = (min); \
+ __typeof__(max) _max = (max); \
+ (void)(&_x == &_min); \
+ (void)(&_x == &_max); \
+ (_x > _max ? _max : (_x < _min ? _min : _x)); \
+})
+
/*
* The round_up() macro rounds up a value to the given boundary in a
* type-agnostic yet type-safe manner. The boundary must be a power of two.