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annotate src/lib/utc-offset.c @ 9658:8ba4253adc9b HEAD tip

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author Timo Sirainen <tss@iki.fi>
date Thu, 08 May 2014 16:41:29 +0300
parents 00cd9aacd03c
children
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00cd9aacd03c Updated copyright notices to include year 2010.
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1 /* Copyright (c) 2002-2010 Dovecot authors, see the included COPYING file */
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2
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3 #include "lib.h"
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4 #include "utc-offset.h"
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5
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6 #include <sys/time.h>
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7
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8 int utc_offset(struct tm *tm, time_t t ATTR_UNUSED)
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9 {
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10 #ifdef HAVE_TM_GMTOFF
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11 return (int) (tm->tm_gmtoff/60);
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12 #else
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13 struct tm ltm, gtm;
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14 int offset;
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15
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16 /* gmtime() overwrites tm, so we need to copy it elsewhere */
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17 ltm = *tm;
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18 tm = gmtime(&t);
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19 gtm = *tm;
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20
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21 /* max offset of 24 hours */
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22 if ((ltm.tm_yday < gtm.tm_yday && ltm.tm_year == gtm.tm_year) ||
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23 ltm.tm_year < gtm.tm_year)
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24 offset = -24 * 60;
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25 else if ((ltm.tm_yday > gtm.tm_yday && ltm.tm_year == gtm.tm_year) ||
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26 ltm.tm_year > gtm.tm_year)
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27 offset = 24 * 60;
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28 else
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29 offset = 0;
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31 offset += (ltm.tm_hour - gtm.tm_hour) * 60;
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32 offset += (ltm.tm_min - gtm.tm_min);
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33
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34 /* restore overwritten tm */
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35 *tm = ltm;
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36 return offset;
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37 #endif
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38 }