r3223: continue the effort on LIBREPLACE to try to get the ldb tools to

compile on platforms like solaris without having to link to the whole
of the Samba4 lib directory.
(This used to be commit f6862bfc1cbc9278914b4b73365f63d3da0a08dd)

1 files changed, 33 insertions, 0 deletions

diff --git a/source4/lib/replace.c b/source4/lib/replace.c
index f3a0df6ef6..4ed99c833c 100644
--- a/source4/lib/replace.c
+++ b/source4/lib/replace.c
@@ -427,6 +427,39 @@ char *rep_inet_ntoa(struct in_addr ip)
 #endif /* HAVE_SYSLOG */
 #endif /* HAVE_VSYSLOG */
 
+/*******************************************************************
+yield the difference between *A and *B, in seconds, ignoring leap seconds
+********************************************************************/
+static int tm_diff(struct tm *a, struct tm *b)
+{
+	int ay = a->tm_year + (1900 - 1);
+	int by = b->tm_year + (1900 - 1);
+	int intervening_leap_days =
+		(ay/4 - by/4) - (ay/100 - by/100) + (ay/400 - by/400);
+	int years = ay - by;
+	int days = 365*years + intervening_leap_days + (a->tm_yday - b->tm_yday);
+	int hours = 24*days + (a->tm_hour - b->tm_hour);
+	int minutes = 60*hours + (a->tm_min - b->tm_min);
+	int seconds = 60*minutes + (a->tm_sec - b->tm_sec);
+
+	return seconds;
+}
+
+/*******************************************************************
+  return the UTC offset in seconds west of UTC, or 0 if it cannot be determined
+  ******************************************************************/
+int get_time_zone(time_t t)
+{
+	struct tm *tm = gmtime(&t);
+	struct tm tm_utc;
+	if (!tm)
+		return 0;
+	tm_utc = *tm;
+	tm = localtime(&t);
+	if (!tm)
+		return 0;
+	return tm_diff(&tm_utc,tm);
+}
 
 #ifndef HAVE_TIMEGM
 /*