From 57a0fda5da8295b88d94d74f94ff6f80f268e00a Mon Sep 17 00:00:00 2001
From: Kamil Sroka <kamilsroka92@gmail.com>
Date: Wed, 16 Jan 2019 09:17:32 +0100
Subject: [PATCH] [sntp] fix Keil build with SNTP_CLIENT=1 (#3460)

---
 include/openthread/platform/toolchain.h | 11 +++++++++++
 src/core/net/sntp_client.cpp            |  4 ++--
 src/core/net/sntp_client.hpp            |  1 -
 3 files changed, 13 insertions(+), 3 deletions(-)

diff --git a/include/openthread/platform/toolchain.h b/include/openthread/platform/toolchain.h
index c892b9e74..474221349 100644
--- a/include/openthread/platform/toolchain.h
+++ b/include/openthread/platform/toolchain.h
@@ -300,6 +300,17 @@ extern "C" {
 
 #endif
 
+/*
+ * Keil and IAR compiler doesn't provide type limits for C++.
+ */
+#if defined(__CC_ARM) || defined(__ICCARM__)
+
+#ifndef UINT32_MAX
+#define UINT32_MAX 0xffffffff
+#endif
+
+#endif
+
 /**
  * @}
  *
diff --git a/src/core/net/sntp_client.cpp b/src/core/net/sntp_client.cpp
index 575472179..efd3d5785 100644
--- a/src/core/net/sntp_client.cpp
+++ b/src/core/net/sntp_client.cpp
@@ -365,7 +365,7 @@ void Client::HandleUdpReceive(Message &aMessage, const Ip6::MessageInfo &aMessag
     // Due to NTP protocol limitation, this module stops working correctly after around year 2106, if
     // unix era is not updated. This seems to be a reasonable limitation for now. Era number cannot be
     // obtained using NTP protocol, and client of this module is responsible to set it properly.
-    unixTime = GetUnixEra() * (UINT32_MAX + 1);
+    unixTime = GetUnixEra() * (UINT32_MAX + 1ULL);
 
     if (responseHeader.GetTransmitTimestampSeconds() > kTimeAt1970)
     {
@@ -374,7 +374,7 @@ void Client::HandleUdpReceive(Message &aMessage, const Ip6::MessageInfo &aMessag
     else
     {
         unixTime +=
-            static_cast<uint64_t>(responseHeader.GetTransmitTimestampSeconds()) + (UINT32_MAX + 1) - kTimeAt1970;
+            static_cast<uint64_t>(responseHeader.GetTransmitTimestampSeconds()) + (UINT32_MAX + 1ULL) - kTimeAt1970;
     }
 
     // Return the time since 1970.
diff --git a/src/core/net/sntp_client.hpp b/src/core/net/sntp_client.hpp
index ccef720aa..eb135ea5e 100644
--- a/src/core/net/sntp_client.hpp
+++ b/src/core/net/sntp_client.hpp
@@ -31,7 +31,6 @@
 
 #include "openthread-core-config.h"
 
-#include <limits.h>
 #include <openthread/sntp.h>
 
 #include "common/message.hpp"