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authorBenoit Bolsee <benoit.bolsee@wtl.be>2017-07-05 12:57:16 +0200
committerHarald Welte <laforge@gnumonks.org>2017-07-10 17:19:50 +0000
commit61a7e57d8608052a050795c1620f1e918ab80a31 (patch)
treea9cf7692ffb0c3615070b7d1a2ed4fffa8845a8e /openbsc/src/libmsc
parent3ea54c8fa92eaa81b1903de89cf2872e75b3c76b (diff)
04.08: find a portable way to obtain the timezone offset
Portable GMT offset calculation to display correct time on GSM. Change-Id: I673f17af2550c9708c4771e4ea4eafbbfafbb824
Diffstat (limited to 'openbsc/src/libmsc')
-rw-r--r--openbsc/src/libmsc/gsm_04_08.c13
1 files changed, 10 insertions, 3 deletions
diff --git a/openbsc/src/libmsc/gsm_04_08.c b/openbsc/src/libmsc/gsm_04_08.c
index 89108e466..f92622334 100644
--- a/openbsc/src/libmsc/gsm_04_08.c
+++ b/openbsc/src/libmsc/gsm_04_08.c
@@ -861,12 +861,19 @@ int gsm48_tx_mm_info(struct gsm_subscriber_connection *conn)
else {
/* Need to get GSM offset and convert into 15 min units */
/* This probably breaks if gmtoff returns a value not evenly divisible by 15? */
- local_time = localtime(&cur_t);
#ifdef HAVE_TM_GMTOFF_IN_TM
+ local_time = localtime(&cur_t);
tzunits = (local_time->tm_gmtoff/60)/15;
#else
-#warning find a portable way to obtain the timezone offset
- tzunits = 0;
+ /* find timezone offset */
+ time_t utc;
+ double offsetFromUTC;
+ utc = mktime(gmt_time);
+ local_time = localtime(&cur_t);
+ offsetFromUTC = difftime(cur_t, utc);
+ if (local_time->tm_isdst)
+ offsetFromUTC += 3600.0;
+ tzunits = ((int)offsetFromUTC) / 60 / 15;
#endif
if (tzunits < 0) {
tzunits = tzunits/-1;