X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=src%2Futil%2Ftime.c;h=a615756280b803db0a4925edf6341e9a73de0742;hb=c4c5c2937f06b5d408f85dfdad5b53db45e51f4b;hp=3ee15516a165185dc8717ba71cee00358f9e6f9d;hpb=83b19539f4d322b43683f5838b72e9ec2c8e6073;p=oweals%2Fgnunet.git

diff --git a/src/util/time.c b/src/util/time.c
index 3ee15516a..a61575628 100644
--- a/src/util/time.c
+++ b/src/util/time.c
@@ -1,10 +1,10 @@
 /*
      This file is part of GNUnet.
-     (C) 2001, 2002, 2006, 2009 Christian Grothoff (and other contributing authors)
+     (C) 2001-2013 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
+     by the Free Software Foundation; either version 3, or (at your
      option) any later version.
 
      GNUnet is distributed in the hope that it will be useful, but
@@ -24,10 +24,13 @@
  * @brief functions for handling time and time arithmetic
  */
 #include "platform.h"
-#include "gnunet_time_lib.h"
+#include "gnunet_util_lib.h"
 
 #define LOG(kind,...) GNUNET_log_from (kind, "util", __VA_ARGS__)
 
+/**
+ * Variable used to simulate clock skew.  Used for testing, never in production.
+ */
 static long long timestamp_offset;
 
 /**
@@ -41,6 +44,19 @@ GNUNET_TIME_set_offset (long long offset)
   timestamp_offset = offset;
 }
 
+
+/**
+ * Get the timestamp offset for this instance.
+ *
+ * @return the offset we currently skew the locale time by
+ */
+long long
+GNUNET_TIME_get_offset ()
+{
+  return timestamp_offset;
+}
+
+
 /**
  * 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)).
@@ -54,9 +70,9 @@ GNUNET_TIME_absolute_get ()
   struct timeval tv;
 
   GETTIMEOFDAY (&tv, NULL);
-  ret.abs_value =
-      (uint64_t) (((uint64_t) tv.tv_sec * 1000LL) +
-                  ((uint64_t) tv.tv_usec / 1000LL)) + timestamp_offset;
+  ret.abs_value_us =
+      (uint64_t) (((uint64_t) tv.tv_sec * 1000LL * 1000LL) +
+                  ((uint64_t) tv.tv_usec)) + timestamp_offset;
   return ret;
 }
 
@@ -65,7 +81,7 @@ GNUNET_TIME_absolute_get ()
  * Return relative time of 0ms.
  */
 struct GNUNET_TIME_Relative
-GNUNET_TIME_relative_get_zero ()
+GNUNET_TIME_relative_get_zero_ ()
 {
   static struct GNUNET_TIME_Relative zero;
 
@@ -77,28 +93,74 @@ GNUNET_TIME_relative_get_zero ()
  * Return absolute time of 0ms.
  */
 struct GNUNET_TIME_Absolute
-GNUNET_TIME_absolute_get_zero ()
+GNUNET_TIME_absolute_get_zero_ ()
 {
   static struct GNUNET_TIME_Absolute zero;
 
   return zero;
 }
 
+
+/**
+ * Return relative time of 1us.
+ */
+struct GNUNET_TIME_Relative
+GNUNET_TIME_relative_get_unit_ ()
+{
+  static struct GNUNET_TIME_Relative one = { 1 };
+  return one;
+}
+
+
 /**
  * Return relative time of 1ms.
  */
 struct GNUNET_TIME_Relative
-GNUNET_TIME_relative_get_unit ()
+GNUNET_TIME_relative_get_millisecond_ ()
 {
-  static struct GNUNET_TIME_Relative one = { 1 };
+  static struct GNUNET_TIME_Relative one = { 1000 };
+  return one;
+}
+
+
+/**
+ * Return relative time of 1s.
+ */
+struct GNUNET_TIME_Relative
+GNUNET_TIME_relative_get_second_ ()
+{
+  static struct GNUNET_TIME_Relative one = { 1000 * 1000LL };
+  return one;
+}
+
+
+/**
+ * Return relative time of 1 minute.
+ */
+struct GNUNET_TIME_Relative
+GNUNET_TIME_relative_get_minute_ ()
+{
+  static struct GNUNET_TIME_Relative one = { 60 * 1000 * 1000LL };
+  return one;
+}
+
+
+/**
+ * Return relative time of 1 hour.
+ */
+struct GNUNET_TIME_Relative
+GNUNET_TIME_relative_get_hour_ ()
+{
+  static struct GNUNET_TIME_Relative one = { 60 * 60 * 1000 * 1000LL };
   return one;
 }
 
+
 /**
  * Return "forever".
  */
 struct GNUNET_TIME_Relative
-GNUNET_TIME_relative_get_forever ()
+GNUNET_TIME_relative_get_forever_ ()
 {
   static struct GNUNET_TIME_Relative forever = { UINT64_MAX };
   return forever;
@@ -108,7 +170,7 @@ GNUNET_TIME_relative_get_forever ()
  * Return "forever".
  */
 struct GNUNET_TIME_Absolute
-GNUNET_TIME_absolute_get_forever ()
+GNUNET_TIME_absolute_get_forever_ ()
 {
   static struct GNUNET_TIME_Absolute forever = { UINT64_MAX };
   return forever;
@@ -125,16 +187,16 @@ GNUNET_TIME_relative_to_absolute (struct GNUNET_TIME_Relative rel)
 {
   struct GNUNET_TIME_Absolute ret;
 
-  if (rel.rel_value == UINT64_MAX)
-    return GNUNET_TIME_absolute_get_forever ();
+  if (rel.rel_value_us == UINT64_MAX)
+    return GNUNET_TIME_UNIT_FOREVER_ABS;
   struct GNUNET_TIME_Absolute now = GNUNET_TIME_absolute_get ();
 
-  if (rel.rel_value + now.abs_value < rel.rel_value)
+  if (rel.rel_value_us + now.abs_value_us < rel.rel_value_us)
   {
     GNUNET_break (0);           /* overflow... */
-    return GNUNET_TIME_absolute_get_forever ();
+    return GNUNET_TIME_UNIT_FOREVER_ABS;
   }
-  ret.abs_value = rel.rel_value + now.abs_value;
+  ret.abs_value_us = rel.rel_value_us + now.abs_value_us;
   return ret;
 }
 
@@ -150,7 +212,7 @@ struct GNUNET_TIME_Relative
 GNUNET_TIME_relative_min (struct GNUNET_TIME_Relative t1,
                           struct GNUNET_TIME_Relative t2)
 {
-  return (t1.rel_value < t2.rel_value) ? t1 : t2;
+  return (t1.rel_value_us < t2.rel_value_us) ? t1 : t2;
 }
 
 
@@ -165,7 +227,7 @@ struct GNUNET_TIME_Relative
 GNUNET_TIME_relative_max (struct GNUNET_TIME_Relative t1,
                           struct GNUNET_TIME_Relative t2)
 {
-  return (t1.rel_value > t2.rel_value) ? t1 : t2;
+  return (t1.rel_value_us > t2.rel_value_us) ? t1 : t2;
 }
 
 
@@ -181,7 +243,7 @@ struct GNUNET_TIME_Absolute
 GNUNET_TIME_absolute_min (struct GNUNET_TIME_Absolute t1,
                           struct GNUNET_TIME_Absolute t2)
 {
-  return (t1.abs_value < t2.abs_value) ? t1 : t2;
+  return (t1.abs_value_us < t2.abs_value_us) ? t1 : t2;
 }
 
 
@@ -190,13 +252,13 @@ GNUNET_TIME_absolute_min (struct GNUNET_TIME_Absolute t1,
  *
  * @param t1 first timestamp
  * @param t2 other timestamp
- * @return timestamp that is smaller
+ * @return timestamp that is bigger
  */
 struct GNUNET_TIME_Absolute
 GNUNET_TIME_absolute_max (struct GNUNET_TIME_Absolute t1,
                           struct GNUNET_TIME_Absolute t2)
 {
-  return (t1.abs_value > t2.abs_value) ? t1 : t2;
+  return (t1.abs_value_us > t2.abs_value_us) ? t1 : t2;
 }
 
 
@@ -211,13 +273,13 @@ GNUNET_TIME_absolute_get_remaining (struct GNUNET_TIME_Absolute future)
 {
   struct GNUNET_TIME_Relative ret;
 
-  if (future.abs_value == UINT64_MAX)
-    return GNUNET_TIME_relative_get_forever ();
+  if (future.abs_value_us == UINT64_MAX)
+    return GNUNET_TIME_UNIT_FOREVER_REL;
   struct GNUNET_TIME_Absolute now = GNUNET_TIME_absolute_get ();
 
-  if (now.abs_value > future.abs_value)
-    return GNUNET_TIME_relative_get_zero ();
-  ret.rel_value = future.abs_value - now.abs_value;
+  if (now.abs_value_us > future.abs_value_us)
+    return GNUNET_TIME_UNIT_ZERO;
+  ret.rel_value_us = future.abs_value_us - now.abs_value_us;
   return ret;
 }
 
@@ -234,11 +296,11 @@ GNUNET_TIME_absolute_get_difference (struct GNUNET_TIME_Absolute start,
 {
   struct GNUNET_TIME_Relative ret;
 
-  if (end.abs_value == UINT64_MAX)
-    return GNUNET_TIME_relative_get_forever ();
-  if (end.abs_value < start.abs_value)
-    return GNUNET_TIME_relative_get_zero ();
-  ret.rel_value = end.abs_value - start.abs_value;
+  if (end.abs_value_us == UINT64_MAX)
+    return GNUNET_TIME_UNIT_FOREVER_REL;
+  if (end.abs_value_us < start.abs_value_us)
+    return GNUNET_TIME_UNIT_ZERO;
+  ret.rel_value_us = end.abs_value_us - start.abs_value_us;
   return ret;
 }
 
@@ -255,10 +317,10 @@ GNUNET_TIME_absolute_get_duration (struct GNUNET_TIME_Absolute whence)
   struct GNUNET_TIME_Relative ret;
 
   now = GNUNET_TIME_absolute_get ();
-  GNUNET_assert (whence.abs_value != UINT64_MAX);
-  if (whence.abs_value > now.abs_value)
-    return GNUNET_TIME_relative_get_zero ();
-  ret.rel_value = now.abs_value - whence.abs_value;
+  GNUNET_assert (whence.abs_value_us != UINT64_MAX);
+  if (whence.abs_value_us > now.abs_value_us)
+    return GNUNET_TIME_UNIT_ZERO;
+  ret.rel_value_us = now.abs_value_us - whence.abs_value_us;
   return ret;
 }
 
@@ -275,14 +337,14 @@ GNUNET_TIME_absolute_add (struct GNUNET_TIME_Absolute start,
 {
   struct GNUNET_TIME_Absolute ret;
 
-  if ((start.abs_value == UINT64_MAX) || (duration.rel_value == UINT64_MAX))
-    return GNUNET_TIME_absolute_get_forever ();
-  if (start.abs_value + duration.rel_value < start.abs_value)
+  if ((start.abs_value_us == UINT64_MAX) || (duration.rel_value_us == UINT64_MAX))
+    return GNUNET_TIME_UNIT_FOREVER_ABS;
+  if (start.abs_value_us + duration.rel_value_us < start.abs_value_us)
   {
     GNUNET_break (0);
-    return GNUNET_TIME_absolute_get_forever ();
+    return GNUNET_TIME_UNIT_FOREVER_ABS;
   }
-  ret.abs_value = start.abs_value + duration.rel_value;
+  ret.abs_value_us = start.abs_value_us + duration.rel_value_us;
   return ret;
 }
 
@@ -301,11 +363,11 @@ GNUNET_TIME_absolute_subtract (struct GNUNET_TIME_Absolute start,
 {
   struct GNUNET_TIME_Absolute ret;
 
-  if (start.abs_value <= duration.rel_value)
+  if (start.abs_value_us <= duration.rel_value_us)
     return GNUNET_TIME_UNIT_ZERO_ABS;
-  if (start.abs_value == GNUNET_TIME_UNIT_FOREVER_ABS.abs_value)
+  if (start.abs_value_us == GNUNET_TIME_UNIT_FOREVER_ABS.abs_value_us)
     return GNUNET_TIME_UNIT_FOREVER_ABS;
-  ret.abs_value = start.abs_value - duration.rel_value;
+  ret.abs_value_us = start.abs_value_us - duration.rel_value_us;
   return ret;
 }
 
@@ -321,13 +383,15 @@ GNUNET_TIME_relative_multiply (struct GNUNET_TIME_Relative rel,
 {
   struct GNUNET_TIME_Relative ret;
 
-  if (factor == 0)
-    return GNUNET_TIME_relative_get_zero ();
-  ret.rel_value = rel.rel_value * (unsigned long long) factor;
-  if (ret.rel_value / factor != rel.rel_value)
+  if (0 == factor)
+    return GNUNET_TIME_UNIT_ZERO;
+  if (rel.rel_value_us == GNUNET_TIME_UNIT_FOREVER_REL.rel_value_us)
+    return GNUNET_TIME_UNIT_FOREVER_REL;
+  ret.rel_value_us = rel.rel_value_us * (unsigned long long) factor;
+  if (ret.rel_value_us / factor != rel.rel_value_us)
   {
     GNUNET_break (0);
-    return GNUNET_TIME_relative_get_forever ();
+    return GNUNET_TIME_UNIT_FOREVER_REL;
   }
   return ret;
 }
@@ -346,10 +410,10 @@ GNUNET_TIME_relative_divide (struct GNUNET_TIME_Relative rel,
 {
   struct GNUNET_TIME_Relative ret;
 
-  if ((factor == 0) ||
-      (rel.rel_value == GNUNET_TIME_UNIT_FOREVER_REL.rel_value))
+  if ((0 == factor) ||
+      (rel.rel_value_us == GNUNET_TIME_UNIT_FOREVER_REL.rel_value_us))
     return GNUNET_TIME_UNIT_FOREVER_REL;
-  ret.rel_value = rel.rel_value / (unsigned long long) factor;
+  ret.rel_value_us = rel.rel_value_us / (unsigned long long) factor;
   return ret;
 }
 
@@ -375,11 +439,11 @@ GNUNET_TIME_calculate_eta (struct GNUNET_TIME_Absolute start, uint64_t finished,
   GNUNET_break (finished <= total);
   if (finished >= total)
     return GNUNET_TIME_UNIT_ZERO;
-  if (finished == 0)
+  if (0 == finished)
     return GNUNET_TIME_UNIT_FOREVER_REL;
   dur = GNUNET_TIME_absolute_get_duration (start);
-  exp = ((double) dur.rel_value) * ((double) total) / ((double) finished);
-  ret.rel_value = ((uint64_t) exp) - dur.rel_value;
+  exp = ((double) dur.rel_value_us) * ((double) total) / ((double) finished);
+  ret.rel_value_us = ((uint64_t) exp) - dur.rel_value_us;
   return ret;
 }
 
@@ -397,14 +461,14 @@ GNUNET_TIME_relative_add (struct GNUNET_TIME_Relative a1,
 {
   struct GNUNET_TIME_Relative ret;
 
-  if ((a1.rel_value == UINT64_MAX) || (a2.rel_value == UINT64_MAX))
-    return GNUNET_TIME_relative_get_forever ();
-  if (a1.rel_value + a2.rel_value < a1.rel_value)
+  if ((a1.rel_value_us == UINT64_MAX) || (a2.rel_value_us == UINT64_MAX))
+    return GNUNET_TIME_UNIT_FOREVER_REL;
+  if (a1.rel_value_us + a2.rel_value_us < a1.rel_value_us)
   {
     GNUNET_break (0);
-    return GNUNET_TIME_relative_get_forever ();
+    return GNUNET_TIME_UNIT_FOREVER_REL;
   }
-  ret.rel_value = a1.rel_value + a2.rel_value;
+  ret.rel_value_us = a1.rel_value_us + a2.rel_value_us;
   return ret;
 }
 
@@ -422,11 +486,11 @@ GNUNET_TIME_relative_subtract (struct GNUNET_TIME_Relative a1,
 {
   struct GNUNET_TIME_Relative ret;
 
-  if (a2.rel_value >= a1.rel_value)
-    return GNUNET_TIME_relative_get_zero ();
-  if (a1.rel_value == UINT64_MAX)
-    return GNUNET_TIME_relative_get_forever ();
-  ret.rel_value = a1.rel_value - a2.rel_value;
+  if (a2.rel_value_us >= a1.rel_value_us)
+    return GNUNET_TIME_UNIT_ZERO;
+  if (a1.rel_value_us == UINT64_MAX)
+    return GNUNET_TIME_UNIT_FOREVER_REL;
+  ret.rel_value_us = a1.rel_value_us - a2.rel_value_us;
   return ret;
 }
 
@@ -442,10 +506,11 @@ GNUNET_TIME_relative_hton (struct GNUNET_TIME_Relative a)
 {
   struct GNUNET_TIME_RelativeNBO ret;
 
-  ret.rel_value__ = GNUNET_htonll (a.rel_value);
+  ret.rel_value_us__ = GNUNET_htonll (a.rel_value_us);
   return ret;
 }
 
+
 /**
  * Convert relative time from network byte order.
  *
@@ -457,11 +522,12 @@ GNUNET_TIME_relative_ntoh (struct GNUNET_TIME_RelativeNBO a)
 {
   struct GNUNET_TIME_Relative ret;
 
-  ret.rel_value = GNUNET_ntohll (a.rel_value__);
+  ret.rel_value_us = GNUNET_ntohll (a.rel_value_us__);
   return ret;
 
 }
 
+
 /**
  * Convert absolute time to network byte order.
  *
@@ -473,10 +539,11 @@ GNUNET_TIME_absolute_hton (struct GNUNET_TIME_Absolute a)
 {
   struct GNUNET_TIME_AbsoluteNBO ret;
 
-  ret.abs_value__ = GNUNET_htonll (a.abs_value);
+  ret.abs_value_us__ = GNUNET_htonll (a.abs_value_us);
   return ret;
 }
 
+
 /**
  * Convert absolute time from network byte order.
  *
@@ -488,29 +555,78 @@ GNUNET_TIME_absolute_ntoh (struct GNUNET_TIME_AbsoluteNBO a)
 {
   struct GNUNET_TIME_Absolute ret;
 
-  ret.abs_value = GNUNET_ntohll (a.abs_value__);
+  ret.abs_value_us = GNUNET_ntohll (a.abs_value_us__);
   return ret;
 
 }
 
+
 /**
- * Convert a relative time to a string.
- * This is one of the very few calls in the entire API that is
- * NOT reentrant!
- *
- * @param time the time to print
+ * Return the current year (i.e. '2011').
+ */
+unsigned int
+GNUNET_TIME_get_current_year ()
+{
+  time_t tp;
+  struct tm *t;
+
+  tp = time (NULL);
+  t = gmtime (&tp);
+  if (t == NULL)
+    return 0;
+  return t->tm_year + 1900;
+}
+
+
+/**
+ * Convert an expiration time to the respective year (rounds)
  *
- * @return string form of the time (as milliseconds)
+ * @param at absolute time
+ * @return year a year (after 1970), 0 on error
  */
-const char *
-GNUNET_TIME_relative_to_string (struct GNUNET_TIME_Relative time)
+unsigned int
+GNUNET_TIME_time_to_year (struct GNUNET_TIME_Absolute at)
 {
-  static char time_string[21];
+  struct tm *t;
+  time_t tp;
+
+  tp = at.abs_value_us / 1000LL / 1000LL;    /* microseconds to seconds */
+  t = gmtime (&tp);
+  if (t == NULL)
+    return 0;
+  return t->tm_year + 1900;
+
+}
 
-  memset (time_string, 0, sizeof (time_string));
 
-  sprintf (time_string, "%llu", (unsigned long long) time.rel_value);
-  return (const char *) time_string;
+/**
+ * Convert a year to an expiration time of January 1st of that year.
+ *
+ * @param year a year (after 1970, please ;-)).
+ * @return absolute time for January 1st of that year.
+ */
+struct GNUNET_TIME_Absolute
+GNUNET_TIME_year_to_time (unsigned int year)
+{
+  struct GNUNET_TIME_Absolute ret;
+  time_t tp;
+  struct tm t;
+
+  memset (&t, 0, sizeof (t));
+  if (year < 1900)
+  {
+    GNUNET_break (0);
+    return GNUNET_TIME_absolute_get (); /* now */
+  }
+  t.tm_year = year - 1900;
+  t.tm_mday = 1;
+  t.tm_mon = 1;
+  t.tm_wday = 1;
+  t.tm_yday = 1;
+  tp = mktime (&t);
+  GNUNET_break (tp != (time_t) - 1);
+  ret.abs_value_us = tp * 1000LL * 1000LL;  /* seconds to microseconds */
+  return ret;
 }