1 files changed, 286 insertions, 0 deletions

diff --git a/src/util/time.c b/src/util/time.c
new file mode 100644
index 000000000..3ae472561
--- /dev/null
+++ b/src/util/time.c
@@ -0,0 +1,286 @@
+/*
+     This file is part of GNUnet.
+     (C) 2001, 2002, 2006, 2009 Christian Grothoff (and other contributing authors)
+
+     GNUnet is free software; you can redistribute it and/or modify
+     it under the terms of the GNU General Public License as published
+     by the Free Software Foundation; either version 2, or (at your
+     option) any later version.
+
+     GNUnet is distributed in the hope that it will be useful, but
+     WITHOUT ANY WARRANTY; without even the implied warranty of
+     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+     General Public License for more details.
+
+     You should have received a copy of the GNU General Public License
+     along with GNUnet; see the file COPYING.  If not, write to the
+     Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+     Boston, MA 02111-1307, USA.
+*/
+
+/**
+ * @file util/time.c
+ * @author Christian Grothoff
+ * @brief functions for handling time and time arithmetic
+ */
+#include "platform.h"
+#include "gnunet_time_lib.h"
+
+
+/**
+ * Get the current time (works just as "time", just that we use the
+ * unit of time that the cron-jobs use (and is 64 bit)).
+ *
+ * @return the current time
+ */
+struct GNUNET_TIME_Absolute
+GNUNET_TIME_absolute_get ()
+{
+  struct GNUNET_TIME_Absolute ret;
+  struct timeval tv;
+
+  gettimeofday (&tv, NULL);
+  ret.value = tv.tv_sec * 1000 + tv.tv_usec / 1000;
+  return ret;
+}
+
+
+/**
+ * Return relative time of 0ms.
+ */
+struct GNUNET_TIME_Relative
+GNUNET_TIME_relative_get_zero ()
+{
+  static struct GNUNET_TIME_Relative zero;
+  return zero;
+}
+
+/**
+ * Return relative time of 1ms.
+ */
+struct GNUNET_TIME_Relative
+GNUNET_TIME_relative_get_unit ()
+{
+  static struct GNUNET_TIME_Relative one = { 1 };
+  return one;
+}
+
+/**
+ * Return "forever".
+ */
+struct GNUNET_TIME_Relative
+GNUNET_TIME_relative_get_forever ()
+{
+  static struct GNUNET_TIME_Relative forever = { (uint64_t) - 1LL };
+  return forever;
+}
+
+/**
+ * Return "forever".
+ */
+struct GNUNET_TIME_Absolute
+GNUNET_TIME_absolute_get_forever ()
+{
+  static struct GNUNET_TIME_Absolute forever = { (uint64_t) - 1LL };
+  return forever;
+}
+
+/**
+ * Convert relative time to an absolute time in the
+ * future.
+ *
+ * @return timestamp that is "rel" in the future, or FOREVER if rel==FOREVER (or if we would overflow)
+ */
+struct GNUNET_TIME_Absolute
+GNUNET_TIME_relative_to_absolute (struct GNUNET_TIME_Relative rel)
+{
+  struct GNUNET_TIME_Absolute ret;
+  if (rel.value == (uint64_t) - 1LL)
+    return GNUNET_TIME_absolute_get_forever ();
+  struct GNUNET_TIME_Absolute now = GNUNET_TIME_absolute_get ();
+  if (rel.value + now.value < rel.value)
+    {
+      GNUNET_break (0);         /* overflow... */
+      return GNUNET_TIME_absolute_get_forever ();
+    }
+  ret.value = rel.value + now.value;
+  return ret;
+}
+
+/**
+ * Given a timestamp in the future, how much time
+ * remains until then?
+ *
+ * @return future - now, or 0 if now >= future, or FOREVER if future==FOREVER.
+ */
+struct GNUNET_TIME_Relative
+GNUNET_TIME_absolute_get_remaining (struct GNUNET_TIME_Absolute future)
+{
+  struct GNUNET_TIME_Relative ret;
+  if (future.value == (uint64_t) - 1LL)
+    return GNUNET_TIME_relative_get_forever ();
+  struct GNUNET_TIME_Absolute now = GNUNET_TIME_absolute_get ();
+  if (now.value > future.value)
+    return GNUNET_TIME_relative_get_zero ();
+  ret.value = future.value - now.value;
+  return ret;
+}
+
+/**
+ * Compute the time difference between the given start and end times.
+ * Use this function instead of actual subtraction to ensure that
+ * "FOREVER" and overflows are handeled correctly.
+ *
+ * @return 0 if start >= end; FOREVER if end==FOREVER; otherwise end - start
+ */
+struct GNUNET_TIME_Relative
+GNUNET_TIME_absolute_get_difference (struct GNUNET_TIME_Absolute start,
+                                     struct GNUNET_TIME_Absolute end)
+{
+  struct GNUNET_TIME_Relative ret;
+  if (end.value == (uint64_t) - 1LL)
+    return GNUNET_TIME_relative_get_forever ();
+  if (end.value < start.value)
+    return GNUNET_TIME_relative_get_zero ();
+  ret.value = end.value - start.value;
+  return ret;
+}
+
+/**
+ * Get the duration of an operation as the
+ * difference of the current time and the given start time "hence".
+ *
+ * @return aborts if hence==FOREVER, 0 if hence > now, otherwise now-hence.
+ */
+struct GNUNET_TIME_Relative
+GNUNET_TIME_absolute_get_duration (struct GNUNET_TIME_Absolute hence)
+{
+  struct GNUNET_TIME_Absolute now;
+  struct GNUNET_TIME_Relative ret;
+
+  now = GNUNET_TIME_absolute_get ();
+  GNUNET_assert (hence.value != (uint64_t) - 1LL);
+  if (hence.value > now.value)
+    return GNUNET_TIME_relative_get_zero ();
+  ret.value = now.value - hence.value;
+  return ret;
+}
+
+
+/**
+ * Add a given relative duration to the
+ * given start time.
+ *
+ * @return FOREVER if either argument is FOREVER or on overflow; start+duration otherwise
+ */
+struct GNUNET_TIME_Absolute
+GNUNET_TIME_absolute_add (struct GNUNET_TIME_Absolute start,
+                          struct GNUNET_TIME_Relative duration)
+{
+  struct GNUNET_TIME_Absolute ret;
+
+  if ((start.value == (uint64_t) - 1LL) ||
+      (duration.value == (uint64_t) - 1LL))
+    return GNUNET_TIME_absolute_get_forever ();
+  if (start.value + duration.value < start.value)
+    {
+      GNUNET_break (0);
+      return GNUNET_TIME_absolute_get_forever ();
+    }
+  ret.value = start.value + duration.value;
+  return ret;
+}
+
+/**
+ * Multiply relative time by a given factor.
+ *
+ * @return FOREVER if rel=FOREVER or on overflow; otherwise rel*factor
+ */
+struct GNUNET_TIME_Relative
+GNUNET_TIME_relative_multiply (struct GNUNET_TIME_Relative rel,
+                               unsigned int factor)
+{
+  struct GNUNET_TIME_Relative ret;
+  if (factor == 0)
+    return GNUNET_TIME_relative_get_zero ();
+  ret.value = rel.value * factor;
+  if (ret.value / factor != rel.value)
+    {
+      GNUNET_break (0);
+      return GNUNET_TIME_relative_get_forever ();
+    }
+  return ret;
+}
+
+/**
+ * Add relative times together.
+ *
+ * @return FOREVER if either argument is FOREVER or on overflow; a1+a2 otherwise
+ */
+struct GNUNET_TIME_Relative
+GNUNET_TIME_relative_add (struct GNUNET_TIME_Relative a1,
+                          struct GNUNET_TIME_Relative a2)
+{
+  struct GNUNET_TIME_Relative ret;
+
+  if ((a1.value == (uint64_t) - 1LL) || (a2.value == (uint64_t) - 1LL))
+    return GNUNET_TIME_relative_get_forever ();
+  if (a1.value + a2.value < a1.value)
+    {
+      GNUNET_break (0);
+      return GNUNET_TIME_relative_get_forever ();
+    }
+  ret.value = a1.value + a2.value;
+  return ret;
+}
+
+
+/**
+ * Convert relative time to network byte order.
+ */
+struct GNUNET_TIME_RelativeNBO
+GNUNET_TIME_relative_hton (struct GNUNET_TIME_Relative a)
+{
+  struct GNUNET_TIME_RelativeNBO ret;
+  ret.value = GNUNET_htonll (a.value);
+  return ret;
+}
+
+/**
+ * Convert relative time from network byte order.
+ */
+struct GNUNET_TIME_Relative
+GNUNET_TIME_relative_ntoh (struct GNUNET_TIME_RelativeNBO a)
+{
+  struct GNUNET_TIME_Relative ret;
+  ret.value = GNUNET_ntohll (a.value);
+  return ret;
+
+}
+
+/**
+ * Convert absolute time to network byte order.
+ */
+struct GNUNET_TIME_AbsoluteNBO
+GNUNET_TIME_absolute_hton (struct GNUNET_TIME_Absolute a)
+{
+  struct GNUNET_TIME_AbsoluteNBO ret;
+  ret.value = GNUNET_htonll (a.value);
+  return ret;
+}
+
+/**
+ * Convert absolute time from network byte order.
+ */
+struct GNUNET_TIME_Absolute
+GNUNET_TIME_absolute_ntoh (struct GNUNET_TIME_AbsoluteNBO a)
+{
+  struct GNUNET_TIME_Absolute ret;
+  ret.value = GNUNET_ntohll (a.value);
+  return ret;
+
+}
+
+
+
+/* end of time.c */