util.h: Provide MIN and MAX macros

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>

diff --git a/util.h b/util.h
index 816c05621571262924460c46ed3358819ecd051e..1f43c5ea5caf34dbcf9a7da2e11cab8d5464b8f6 100644 (file)
--- a/util.h
+++ b/util.h
@@ -51,4 +51,12 @@ extern void send_nak(const struct comm_addr *dest, uint32_t our_index,
 
 extern int consttime_memeq(const void *s1, const void *s2, size_t n);
 
 
 extern int consttime_memeq(const void *s1, const void *s2, size_t n);
 

+#define MINMAX(ae,be,op) ({                    \
+       typeof((ae)) a=(ae);                    \
+       typeof((be)) b=(be);                    \
+       a op b ? a : b;                         \
+    })
+#define MAX(a,b) MINMAX((a),(b),>)
+#define MIN(a,b) MINMAX((a),(b),<)
+

 #endif /* util_h */
 #endif /* util_h */