[gnunet] branch master updated: add GNUNET_TIME_absolute_round_down() function

[gnunet]

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grothoff pushed a commit to branch master
in repository gnunet.

The following commit(s) were added to refs/heads/master by this push:
     new e598ffe0a add GNUNET_TIME_absolute_round_down() function
e598ffe0a is described below

commit e598ffe0a3a3d3db0df1fcc04f52bbefe93d3779
Author: Christian Grothoff <grothoff@gnunet.org>
AuthorDate: Sat Mar 26 07:17:12 2022 +0100

    add GNUNET_TIME_absolute_round_down() function
---
 src/include/gnunet_time_lib.h | 12 ++++++++++++
 src/util/time.c               | 14 ++++++++++++++
 2 files changed, 26 insertions(+)

diff --git a/src/include/gnunet_time_lib.h b/src/include/gnunet_time_lib.h
index 55af62b72..d59eb984d 100644
--- a/src/include/gnunet_time_lib.h
+++ b/src/include/gnunet_time_lib.h
@@ -481,6 +481,18 @@ GNUNET_TIME_absolute_max (struct GNUNET_TIME_Absolute t1,
                           struct GNUNET_TIME_Absolute t2);
 
 
+/**
+ * Round down absolute time @a at to multiple of @a rt.
+ *
+ * @param at absolute time to round
+ * @param rt multiple to round to (non-zero)
+ * @return rounded time
+ */
+struct GNUNET_TIME_Absolute
+GNUNET_TIME_absolute_round_down (struct GNUNET_TIME_Absolute at,
+                                 struct GNUNET_TIME_Relative rt);
+
+
 /**
  * Return the maximum of two timestamps.
  *
diff --git a/src/util/time.c b/src/util/time.c
index aeec2b3f9..cf072aebf 100644
--- a/src/util/time.c
+++ b/src/util/time.c
@@ -386,6 +386,20 @@ GNUNET_TIME_timestamp_min (struct GNUNET_TIME_Timestamp t1,
 }
 
 
+struct GNUNET_TIME_Absolute
+GNUNET_TIME_absolute_round_down (struct GNUNET_TIME_Absolute at,
+                                 struct GNUNET_TIME_Relative rt)
+{
+  struct GNUNET_TIME_Absolute ret;
+
+  GNUNET_assert (! GNUNET_TIME_relative_is_zero (rt));
+  ret.abs_value_us
+    = at.abs_value_us
+    - at.abs_value_us % rt.rel_value_us;
+  return ret;
+}
+
+
 struct GNUNET_TIME_Relative
 GNUNET_TIME_absolute_get_remaining (struct GNUNET_TIME_Absolute future)
 {

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