1 files changed, 41 insertions, 0 deletions
diff --git a/cpukit/score/src/timespecsubtract.c b/cpukit/score/src/timespecsubtract.c
new file mode 100644
index 0000000000..44e9f21c25
--- /dev/null
+++ b/cpukit/score/src/timespecsubtract.c
@@ -0,0 +1,41 @@
+/**
+ *  @file  score/src/timespecsubtract.c
+ */
+
+/*
+ *  COPYRIGHT (c) 1989-2007.
+ *  On-Line Applications Research Corporation (OAR).
+ *
+ *  The license and distribution terms for this file may be
+ *  found in the file LICENSE in this distribution or at
+ *  http://www.rtems.com/license/LICENSE.
+ *
+ *  $Id$
+ */
+
+#if HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <rtems/system.h>
+#include <sys/types.h>
+#include <rtems/score/timespec.h>
+#include <rtems/score/tod.h>
+#include <rtems/score/watchdog.h>
+
+void _Timespec_Subtract(
+  const struct timespec *start,
+  const struct timespec *end,
+  struct timespec       *result
+)
+{
+
+  if (end->tv_nsec < start->tv_nsec) {
+    result->tv_sec  = end->tv_sec - start->tv_sec - 1;
+    result->tv_nsec =
+      (TOD_NANOSECONDS_PER_SECOND - start->tv_nsec) + end->tv_nsec;
+  } else {
+    result->tv_sec  = end->tv_sec - start->tv_sec;
+    result->tv_nsec = end->tv_nsec - start->tv_nsec;
+  }
+}