[libvirt] [PATCH 1/3] virutil: Introduce a new macro named CLAMP.

[Dongsheng Yang]

This patch introduce a new macro to return a
value clamped to a given range.

Signed-off-by: Dongsheng Yang <yangds.fnst at cn.fujitsu.com>
---
 src/util/virutil.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/util/virutil.h b/src/util/virutil.h
index 2bb74e2..e8536d8 100644
--- a/src/util/virutil.h
+++ b/src/util/virutil.h
@@ -37,6 +37,12 @@
 # ifndef MAX
 #  define MAX(a, b) ((a) > (b) ? (a) : (b))
 # endif
+# ifndef CLAMP
+#  define CLAMP(v, min, max) ({         \
+        typeof(v) _v = v;               \
+        _v = _v < min ? min: _v;        \
+        _v > max ? max: _v; })
+# endif
 
 int virSetBlocking(int fd, bool blocking) ATTRIBUTE_RETURN_CHECK;
 int virSetNonBlock(int fd) ATTRIBUTE_RETURN_CHECK;
-- 
1.8.2.1