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annotate src/lib/utc-offset.c @ 6411:6a64e64fa3a3 HEAD

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Renamed __attr_*__ to ATTR_*. Renamed __attrs_used__ to ATTRS_DEFINED.
author Timo Sirainen <tss@iki.fi>
date Sun, 16 Sep 2007 11:40:56 +0300
parents 9df02b1533b3
children 65c69a53a7be
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9df02b1533b3 Removed most of the license comments from src/lib/*.c. It's just fine to
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1 /* Copyright (c) 2002-2003 Timo Sirainen */
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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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6a64e64fa3a3 Renamed __attr_*__ to ATTR_*. Renamed __attrs_used__ to ATTRS_DEFINED.
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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)
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23 offset = -24 * 60;
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24 else if (ltm.tm_yday > gtm.tm_yday)
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25 offset = 24 * 60;
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26 else
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27 offset = 0;
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28
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29 offset += (ltm.tm_hour - gtm.tm_hour) * 60;
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30 offset += (ltm.tm_min - gtm.tm_min);
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31
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32 /* restore overwritten tm */
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33 *tm = ltm;
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34 return offset;
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35 #endif
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36 }