strmake_buf(X,Y) helper, equivalent to strmake(X,Y,sizeof(X)-1)

with a bit of lame protection against abuse.

sql/handler.cc

@@ -2097,7 +2097,7 @@ handle_condition(THD *,
 {
   *cond_hdl= NULL;
   /* Grab the error message */
-  strmake(buff, msg, sizeof(buff)-1);
+  strmake_buf(buff, msg);
   return TRUE;
 }