From 9f95a19a57f0f85212c320327636e93d70bbecc8 Mon Sep 17 00:00:00 2001
From: Joel Sherrill <joel.sherrill@OARcorp.com>
Date: Tue, 2 Nov 1999 18:35:52 +0000
Subject: Split time.c into multiple files.

---
 c/src/exec/posix/src/posixtimespecsubtract.c | 46 ++++++++++++++++++++++++++++
 1 file changed, 46 insertions(+)
 create mode 100644 c/src/exec/posix/src/posixtimespecsubtract.c

(limited to 'c/src/exec/posix/src/posixtimespecsubtract.c')

diff --git a/c/src/exec/posix/src/posixtimespecsubtract.c b/c/src/exec/posix/src/posixtimespecsubtract.c
new file mode 100644
index 0000000000..eb5e21d83a
--- /dev/null
+++ b/c/src/exec/posix/src/posixtimespecsubtract.c
@@ -0,0 +1,46 @@
+/*
+ *  $Id$
+ */
+
+#include <assert.h>
+#include <time.h>
+#include <errno.h>
+
+#include <rtems/system.h>
+#include <rtems/score/isr.h>
+#include <rtems/score/thread.h>
+#include <rtems/score/tod.h>
+
+#include <rtems/posix/seterr.h>
+#include <rtems/posix/time.h>
+
+/*PAGE
+ *
+ *  _POSIX_Timespec_subtract
+ */
+
+void _POSIX_Timespec_subtract(
+  const struct timespec *the_start,
+  const struct timespec *end,
+  struct timespec *result
+)
+{
+  struct timespec  start_struct = *the_start;
+  struct timespec *start = &start_struct;
+  unsigned int nsecs_per_sec = TOD_NANOSECONDS_PER_SECOND;
+ 
+  if (end->tv_nsec < start->tv_nsec) {
+    int seconds = (start->tv_nsec - end->tv_nsec) / nsecs_per_sec + 1;
+    start->tv_nsec -= nsecs_per_sec * seconds;
+    start->tv_sec += seconds;
+  }
+ 
+  if (end->tv_nsec - start->tv_nsec > nsecs_per_sec) {
+    int seconds = (start->tv_nsec - end->tv_nsec) / nsecs_per_sec;
+    start->tv_nsec += nsecs_per_sec * seconds;
+    start->tv_sec -= seconds;
+  }
+ 
+  result->tv_sec  = end->tv_sec - start->tv_sec;
+  result->tv_nsec = end->tv_nsec - start->tv_nsec;
+}
-- 
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