From: ian <ian>
Date: Sat, 26 Jul 2008 16:35:58 +0000 (+0000)
Subject: new macros MIN MAX ENSURE
X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ijackson/git?a=commitdiff_plain;h=7135b6d6dda5c658e5b68ba8c18df776045fa2f5;p=trains.git

new macros MIN MAX ENSURE
---

diff --git a/hostside/common.h b/hostside/common.h
index d0c0a8b..0c9bb41 100644
--- a/hostside/common.h
+++ b/hostside/common.h
@@ -167,6 +167,13 @@ void nmra_encodeforpic(const Nmra *packet, PicInsn *pi_out);
 #define CTYPE(isfoobar,ch) (isfoobar((unsigned char)(ch)))
 #define COMMA ,
 
+#define MAX(a_,b_) ({ typeof(a_) a=(a_); typeof(b_) b=(b_); a >= b ? a : b; })
+#define MIN(a_,b_) ({ typeof(a_) a=(a_); typeof(b_) b=(b_); a <= b ? a : b; })
+#define ENSURE(var,rel,value_) do{		\
+    typeof(value_) value= (value_);		\
+    if ((var) rel value) ; else (var)= value;	\
+  }while(0)
+
 #define STR2(x) #x
 #define STR(x) STR2(x)