Puts platform time abstraction into a own header

Places the platform time abstraction into a separate header file to
avoid dependency issues where a build may need time but not the libc
abstraction.

include/mbedtls/platform.h

@@ -29,6 +29,11 @@
 #include MBEDTLS_CONFIG_FILE
 #endif
 
+#if defined(MBEDTLS_HAVE_TIME)
+#include "platform_time.h"
+#endif
+
+
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -243,39 +248,6 @@ int mbedtls_platform_set_exit( void (*exit_func)( int status ) );
 #define MBEDTLS_EXIT_FAILURE 1
 #endif
 
-/*
- * The time_t datatype
- */
-#if defined(MBEDTLS_PLATFORM_TIME_TYPE_MACRO)
-typedef MBEDTLS_PLATFORM_TIME_TYPE_MACRO mbedtls_time_t;
-#else
-/* For time_t */
-#include <time.h>
-typedef time_t mbedtls_time_t;
-#endif /* MBEDTLS_PLATFORM_TIME_TYPE_MACRO */
-
-/*
- * The function pointers for time
- */
-#if defined(MBEDTLS_PLATFORM_TIME_ALT)
-extern mbedtls_time_t (*mbedtls_time)( mbedtls_time_t* time );
-
-/**
- * \brief   Set your own time function pointer
- *
- * \param   time_func   the time function implementation
- *
- * \return              0
- */
-int mbedtls_platform_set_time( mbedtls_time_t (*time_func)( mbedtls_time_t* time ) );
-#else
-#if defined(MBEDTLS_PLATFORM_TIME_MACRO)
-#define mbedtls_time    MBEDTLS_PLATFORM_TIME_MACRO
-#else
-#define mbedtls_time   time
-#endif /* MBEDTLS_PLATFORM_TIME_MACRO */
-#endif /* MBEDTLS_PLATFORM_TIME_ALT */
-
 /*
  * The function pointers for reading from and writing a seed file to
  * Non-Volatile storage (NV) in a platform-independent way

include/mbedtls/platform_time.h

@@ -0,0 +1,81 @@
+/**
+ * \file platform_time.h
+ *
+ * \brief mbed TLS Platform time abstraction
+ *
+ *  Copyright (C) 2006-2016, ARM Limited, All Rights Reserved
+ *  SPDX-License-Identifier: Apache-2.0
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License"); you may
+ *  not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ *  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ *
+ *  This file is part of mbed TLS (https://tls.mbed.org)
+ */
+#ifndef MBEDTLS_PLATFORM_TIME_H
+#define MBEDTLS_PLATFORM_TIME_H
+
+#if !defined(MBEDTLS_CONFIG_FILE)
+#include "config.h"
+#else
+#include MBEDTLS_CONFIG_FILE
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * \name SECTION: Module settings
+ *
+ * The configuration options you can set for this module are in this section.
+ * Either change them in config.h or define them on the compiler command line.
+ * \{
+ */
+
+/*
+ * The time_t datatype
+ */
+#if defined(MBEDTLS_PLATFORM_TIME_TYPE_MACRO)
+typedef MBEDTLS_PLATFORM_TIME_TYPE_MACRO mbedtls_time_t;
+#else
+/* For time_t */
+#include <time.h>
+typedef time_t mbedtls_time_t;
+#endif /* MBEDTLS_PLATFORM_TIME_TYPE_MACRO */
+
+/*
+ * The function pointers for time
+ */
+#if defined(MBEDTLS_PLATFORM_TIME_ALT)
+extern mbedtls_time_t (*mbedtls_time)( mbedtls_time_t* time );
+
+/**
+ * \brief   Set your own time function pointer
+ *
+ * \param   time_func   the time function implementation
+ *
+ * \return              0
+ */
+int mbedtls_platform_set_time( mbedtls_time_t (*time_func)( mbedtls_time_t* time ) );
+#else
+#if defined(MBEDTLS_PLATFORM_TIME_MACRO)
+#define mbedtls_time    MBEDTLS_PLATFORM_TIME_MACRO
+#else
+#define mbedtls_time   time
+#endif /* MBEDTLS_PLATFORM_TIME_MACRO */
+#endif /* MBEDTLS_PLATFORM_TIME_ALT */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* platform_time.h */

include/mbedtls/ssl.h

@@ -52,7 +52,7 @@
 #endif
 
 #if defined(MBEDTLS_HAVE_TIME)
-#include "platform.h"
+#include "mbedtls/platform_time.h"
 #endif
 
 /*