failed approach

gomspace/libutil/include/gs/util/timestamp.h

@@ -0,0 +1,73 @@
+#ifndef GS_UTIL_TIMESTAMP_H
+#define GS_UTIL_TIMESTAMP_H
+/* Copyright (c) 2013-2017 GomSpace A/S. All rights reserved. */
+/**
+   @file
+
+   Timestamp utilities, for add, subtract, compare, copy, etc.
+*/
+
+#include <gs/util/types.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+   Number of nano seconds per second.
+*/
+#define GS_TIMESTAMP_NSEC_PER_SEC   1000000000
+
+/**
+   Portable time structure.
+
+   Stanadard timespec_t is non-portable, so this structure must be used instead
+*/
+typedef struct {
+    /** Seconds. */
+    uint32_t tv_sec;
+    /** Nano seconds. */
+    uint32_t tv_nsec;
+} gs_timestamp_t;
+
+/**
+   @deprecated Use gs_timestamp_t
+*/
+typedef gs_timestamp_t timestamp_t;
+
+/**
+   Add 2 timestamp's (t1 = t1 + t2).
+   @param[in,out] t1 timestamp
+   @param[in] t2 timestamp.
+   @return 0 on success, otherwise -1
+*/
+int timestamp_add(gs_timestamp_t * t1, const gs_timestamp_t * t2);
+
+/**
+   Subtract 2 timestamp's (t1 = t1 - t2)
+   @param[in,out] t1 timestamp
+   @param[in] t2 timestamp.
+   @return 0 on success, otherwise -1
+*/
+int timestamp_diff(gs_timestamp_t * t1, const gs_timestamp_t * t2);
+
+/**
+   Check if t2 is greate than t1.
+   @param[in] t1 time to compare
+   @param[in] t2 time to compare
+   @return 1 if t2 > t1, else 0. -1 on bad arguments.
+*/
+int timestamp_ge(const gs_timestamp_t * t1, const gs_timestamp_t * t2);
+
+/**
+   Copy timestamp.
+   @param[in] from from timestamp
+   @param[out] to to timestamp
+   @return 0 on success, otherwise -1
+*/
+int timestamp_copy(const gs_timestamp_t * from, gs_timestamp_t * to);
+
+#ifdef __cplusplus
+}
+#endif
+#endif