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Daniel Willmann dwillmann at sysmocom.deDear Alexander, On Fri, 2014-03-07 at 21:24, Alexander Chemeris wrote: > -- > Regards, > Alexander Chemeris. > CEO, Fairwaves, Inc. / ООО УмРадио > https://fairwaves.co > From 44600bbe8d0de88b7fbb2530e12b9122bf6e52df Mon Sep 17 00:00:00 2001 > From: Alexander Chemeris <Alexander.Chemeris at gmail.com> > Date: Fri, 7 Mar 2014 21:02:46 +0100 > Subject: [PATCH 5/6] sms: Fix support of negative timezone offsets in > gsm340_gen_scts(). > > --- > src/gsm/gsm0411_utils.c | 5 ++++- > 1 file changed, 4 insertions(+), 1 deletion(-) > > diff --git a/src/gsm/gsm0411_utils.c b/src/gsm/gsm0411_utils.c > index 6272ba3..e884eca 100644 > --- a/src/gsm/gsm0411_utils.c > +++ b/src/gsm/gsm0411_utils.c > @@ -85,7 +85,10 @@ void gsm340_gen_scts(uint8_t *scts, time_t time) > *scts++ = gsm411_bcdify(tm->tm_min); > *scts++ = gsm411_bcdify(tm->tm_sec); > #ifdef HAVE_TM_GMTOFF_IN_TM > - *scts++ = gsm411_bcdify(tm->tm_gmtoff/(60*15)); > + if (tm->tm_gmtoff >= 0) > + *scts++ = gsm411_bcdify(tm->tm_gmtoff/(60*15)); > + else > + *scts++ = gsm411_bcdify(-tm->tm_gmtoff/(60*15)) | 0x80; > #else > #warning find a portable way to obtain timezone offset > *scts++ = 0; > -- > 1.7.9.5 after looking through the code and thinking about mktime/timegm some more I noticed that we actually want to used localtime() instead of gmtime() in this function. gmtime will always set tm_gmtoff zero (as it converts it into UTC). This function could be written without any use of tm_gmtoff by using both localtime and gmtime, converting these results back to time_t with mktime and calculating the difference. I'll send a patch in a an extra mail. Regards, Daniel -- - Daniel Willmann <dwillmann at sysmocom.de> http://www.sysmocom.de/ ======================================================================= * sysmocom - systems for mobile communications GmbH * Schivelbeiner Str. 5 * 10439 Berlin, Germany * Sitz / Registered office: Berlin, HRB 134158 B * Geschaeftsfuehrer / Managing Directors: Holger Freyther, Harald Welte