From: David Herrmann <dh.herrmann@gmail.com>
Date: Mon, 30 Jun 2014 13:43:40 +0000 (+0200)
Subject: shared: add MIN3 macro
X-Git-Tag: v216~654
X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=commitdiff_plain;h=7df23077e45e55a6fc15eb99fe2ae439678e37e0;p=elogind.git

shared: add MIN3 macro

This is like MIN but evaluates 3 arguments. We already have MAX3, so add
the equivalent for MIN.
---

diff --git a/src/shared/macro.h b/src/shared/macro.h
index 32cf71485..70c5fb50a 100644
--- a/src/shared/macro.h
+++ b/src/shared/macro.h
@@ -154,6 +154,12 @@ static inline unsigned long ALIGN_POWER2(unsigned long u) {
                         _a < _b ? _a : _b;      \
                 })
 
+#define MIN3(x,y,z)                              \
+        __extension__ ({                         \
+                        typeof(x) _c = MIN(x,y); \
+                        MIN(_c, z);              \
+                })
+
 #define LESS_BY(A,B)                            \
         __extension__ ({                        \
                         typeof(A) _A = (A);     \