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
This commit is contained in:
Lionel Debieve 2020-01-02 11:14:16 +01:00
parent 162fc183cf
commit e76d9fc422
1 changed files with 9 additions and 0 deletions

View File

@ -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.