From 801830df57ac866a69c0393dc58ae418788a2df9 Mon Sep 17 00:00:00 2001
From: Miroslav Lichvar <mlichvar@redhat.com>
Date: Fri, 27 Nov 2015 11:03:16 +0100
Subject: [PATCH] util: add macros for maximum, minimum and clamp

If MAX/MIN are defined in system headers, undefine them first.
---
 ntp_core.c |  3 +--
 util.h     | 13 +++++++++++++
 2 files changed, 14 insertions(+), 2 deletions(-)

diff --git a/ntp_core.c b/ntp_core.c
index 8987468..26ca39b 100644
--- a/ntp_core.c
+++ b/ntp_core.c
@@ -1404,8 +1404,7 @@ receive_packet(NTP_Packet *message, struct timeval *now, double now_err, NCR_Ins
                            &sample_time,
                            offset, delay, dispersion,
                            root_delay, root_dispersion,
-                           message->stratum > inst->min_stratum ?
-                             message->stratum : inst->min_stratum,
+                           MAX(message->stratum, inst->min_stratum),
                            (NTP_Leap) pkt_leap);
 
       SRC_SelectSource(inst->source);
diff --git a/util.h b/util.h
index 78b7d71..ebd0d20 100644
--- a/util.h
+++ b/util.h
@@ -148,4 +148,17 @@ extern int UTI_CheckDirPermissions(const char *path, mode_t perm, uid_t uid, gid
 /* Fill buffer with random bytes */
 extern void UTI_GetRandomBytes(void *buf, unsigned int len);
 
+/* Macros to get maximum and minimum of two values */
+#ifdef MAX
+#undef MAX
+#endif
+#define MAX(x, y) ((x) > (y) ? (x) : (y))
+#ifdef MIN
+#undef MIN
+#endif
+#define MIN(x, y) ((x) < (y) ? (x) : (y))
+
+/* Macro to clamp a value between two values */
+#define CLAMP(min, x, max) (MAX((min), MIN((x), (max))))
+
 #endif /* GOT_UTIL_H */