1 files changed, 79 insertions, 0 deletions
diff --git a/src/include/timegm.h b/src/include/timegm.h
new file mode 100644
index 000000000..fb970432d
--- /dev/null
+++ b/src/include/timegm.h
@@ -0,0 +1,79 @@
+//  (C) Copyright Howard Hinnant
+//  (C) Copyright 2010-2011 Vicente J. Botet Escriba
+//  Use, modification and distribution are subject to the Boost Software License,
+//  Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
+//  http://www.boost.org/LICENSE_1_0.txt).
+
+//===-------------------------- locale ------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// This code was adapted by Vicente from Howard Hinnant's experimental work
+// on chrono i/o to Boost and some functions from libc++/locale to emulate the missing time_get::get()
+
+#ifndef BOOST_CHRONO_IO_TIME_POINT_IO_H
+#define BOOST_CHRONO_IO_TIME_POINT_IO_H
+
+#include <time.h>
+
+static int32_t is_leap(int32_t year) {
+  if(year % 400 == 0)
+    return 1;
+  if(year % 100 == 0)
+    return 0;
+  if(year % 4 == 0)
+    return 1;
+  return 0;
+}
+
+static int32_t days_from_0(int32_t year) {
+  year--;
+  return 365 * year + (year / 400) - (year/100) + (year / 4);
+}
+
+int32_t static days_from_1970(int32_t year) {
+  static const int days_from_0_to_1970 = days_from_0(1970);
+  return days_from_0(year) - days_from_0_to_1970;
+}
+
+static int32_t days_from_1jan(int32_t year,int32_t month,int32_t day) {
+  static const int32_t days[2][12] =
+  {
+    { 0,31,59,90,120,151,181,212,243,273,304,334},
+    { 0,31,60,91,121,152,182,213,244,274,305,335}
+  };
+
+  return days[is_leap(year)][month-1] + day - 1;
+}
+
+static  time_t internal_timegm(tm const *t) {
+  int year = t->tm_year + 1900;
+  int month = t->tm_mon;
+  if(month > 11)
+  {
+    year += month/12;
+    month %= 12;
+  }
+  else if(month < 0)
+  {
+    int years_diff = (-month + 11)/12;
+    year -= years_diff;
+    month+=12 * years_diff;
+  }
+  month++;
+  int day = t->tm_mday;
+  int day_of_year = days_from_1jan(year,month,day);
+  int days_since_epoch = days_from_1970(year) + day_of_year ;
+
+  time_t seconds_in_day = 3600 * 24;
+  time_t result = seconds_in_day * days_since_epoch + 3600 * t->tm_hour + 60 * t->tm_min + t->tm_sec;
+
+  return result;
+}
+
+#endif