add max(), min() functions

1 files changed, 4 insertions, 0 deletions

diff --git a/include/utility.h b/include/utility.h
index f51a646..2e2de7e 100644
--- a/include/utility.h
+++ b/include/utility.h
@@ -36,6 +36,8 @@
 /*     ctl_free     like free(), but will return NULL     */
 /*     ctl_die      print some message and exit()         */
 /*     ctl_swap     swap two elements with given type     */
+/*     ctl_max      return the max of the two arguments   */
+/*     ctl_min      return the min of the two arguments   */
 /*                                                        */
 /**********************************************************/
 
@@ -104,5 +106,7 @@ pvoid ctl_free   (pvoid ptr);
 void  ctl_die    (ErrorType e);
 
 #define ctl_swap(X,Y,Z) do{X zzzztmp=(Y);(Y)=(Z);(Z)=zzzztmp;}while(0)
+#define ctl_max(X,Y)    ((X) > (Y) ? (X) : (Y))
+#define ctl_min(X,Y)    ((X) < (Y) ? (X) : (Y))
 
 #endif /* __utility_h__ */