From 7e292b9a9a52829bd29bd09f0cfcac8b269d4373 Mon Sep 17 00:00:00 2001
From: "msvensson@pilot.blaudden" <>
Date: Fri, 23 Feb 2007 17:33:11 +0100
Subject: [PATCH 1/2] Bug#26536 func_time failure on vm-win2003-64-b, occurs
 every time  - Avoid overflow in sec_since_epoch by shifting the time    back
 2 days for times close to the maximum range of my_time_t  - Improve comment
 about why we need my_time_t  - Patch will also fix timezone2.test

---
 include/my_time.h |  8 +++++++-
 sql/tztime.cc     | 23 ++++++++++++++++++++---
 2 files changed, 27 insertions(+), 4 deletions(-)

diff --git a/include/my_time.h b/include/my_time.h
index 14726d3a01d..3c8f4274409 100644
--- a/include/my_time.h
+++ b/include/my_time.h
@@ -30,7 +30,13 @@ extern uchar days_in_month[];
 
 /*
   Portable time_t replacement.
-  Should be signed and hold seconds for 1902-2038 range.
+  Should be signed and hold seconds for 1902 -- 2038-01-19 range
+  i.e at least a 32bit variable
+
+  Using the system built in time_t is not an option as
+  we rely on the above requirements in the time functions
+
+  For example QNX has an unsigned time_t type
 */
 typedef long my_time_t;
 
diff --git a/sql/tztime.cc b/sql/tztime.cc
index 91bd4471463..ac1fa4ddff8 100644
--- a/sql/tztime.cc
+++ b/sql/tztime.cc
@@ -780,6 +780,8 @@ gmt_sec_to_TIME(TIME *tmp, my_time_t sec_in_utc, const TIME_ZONE_INFO *sp)
 static my_time_t
 sec_since_epoch(int year, int mon, int mday, int hour, int min ,int sec)
 {
+  /* Guard against my_time_t overflow(on system with 32 bit my_time_t) */
+  DBUG_ASSERT(!(year == TIMESTAMP_MAX_YEAR && mon == 1 && mday > 17));
 #ifndef WE_WANT_TO_HANDLE_UNORMALIZED_DATES
   /*
     It turns out that only whenever month is normalized or unnormalized
@@ -948,12 +950,12 @@ TIME_to_gmt_sec(const TIME *t, const TIME_ZONE_INFO *sp,
   */
   if (shift)
   {
-    if (local_t > (my_time_t) (TIMESTAMP_MAX_VALUE - shift*86400L +
+    if (local_t > (my_time_t) (TIMESTAMP_MAX_VALUE - shift * SECS_PER_DAY +
                                sp->revtis[i].rt_offset - saved_seconds))
     {
       DBUG_RETURN(0);                           /* my_time_t overflow */
     }
-    local_t+= shift*86400L;
+    local_t+= shift * SECS_PER_DAY;
   }
 
   if (sp->revtis[i].rt_type)
@@ -1341,6 +1343,7 @@ my_time_t
 Time_zone_offset::TIME_to_gmt_sec(const TIME *t, my_bool *in_dst_time_gap) const
 {
   my_time_t local_t;
+  int shift= 0;
 
   /*
     Check timestamp range.we have to do this as calling function relies on
@@ -1349,10 +1352,24 @@ Time_zone_offset::TIME_to_gmt_sec(const TIME *t, my_bool *in_dst_time_gap) const
   if (!validate_timestamp_range(t))
     return 0;
 
-  local_t= sec_since_epoch(t->year, t->month, t->day,
+  /*
+    Do a temporary shift of the boundary dates to avoid
+    overflow of my_time_t if the time value is near it's
+    maximum range
+  */
+  if ((t->year == TIMESTAMP_MAX_YEAR) && (t->month == 1) && t->day > 4)
+    shift= 2;
+
+  local_t= sec_since_epoch(t->year, t->month, (t->day - shift),
                            t->hour, t->minute, t->second) -
            offset;
 
+  if (shift)
+  {
+    /* Add back the shifted time */
+    local_t+= shift * SECS_PER_DAY;
+  }
+
   if (local_t >= TIMESTAMP_MIN_VALUE && local_t <= TIMESTAMP_MAX_VALUE)
     return local_t;
 

From cb8cbe0033c201c191f68bc99afba794fb329a3d Mon Sep 17 00:00:00 2001
From: "msvensson@pilot.blaudden" <>
Date: Fri, 23 Feb 2007 17:59:07 +0100
Subject: [PATCH 2/2] Bug#26536 func_time failure on vm-win2003-64-b, occurs
 every time  - Fixes for 5.1  - Always use long for my_time_t

---
 include/my_time.h | 8 +-------
 1 file changed, 1 insertion(+), 7 deletions(-)

diff --git a/include/my_time.h b/include/my_time.h
index 88abe02ac08..d96c5822069 100644
--- a/include/my_time.h
+++ b/include/my_time.h
@@ -38,13 +38,7 @@ extern uchar days_in_month[];
 
   For example QNX has an unsigned time_t type
 */
-#if defined(_WIN64) || defined(WIN64)
-/* on Win64 long is still 4 bytes (not 8!) */
-typedef LONG64 my_time_t;
-#else
-typedef time_t my_time_t;
-
-#endif
+typedef long my_time_t;
 
 #define MY_TIME_T_MAX LONG_MAX
 #define MY_TIME_T_MIN LONG_MIN