Mercurial > dovecot > core-2.2

annotate src/lib/utc-offset.c @ 903:fd8888f6f037 HEAD

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Naming style changes, finally got tired of most of the typedefs. Also the previous enum -> macro change reverted so that we don't use the highest bit anymore, that's incompatible with old indexes so they will be rebuilt.
author Timo Sirainen <tss@iki.fi>
date Sun, 05 Jan 2003 15:09:51 +0200
parents 293aac070c2c
children 9df02b1533b3
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
492
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1 /*
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2 Copyright (c) 2002 Timo Sirainen
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3
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4 Permission is hereby granted, free of charge, to any person obtaining
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5 a copy of this software and associated documentation files (the
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6 "Software"), to deal in the Software without restriction, including
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7 without limitation the rights to use, copy, modify, merge, publish,
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8 distribute, sublicense, and/or sell copies of the Software, and to
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9 permit persons to whom the Software is furnished to do so, subject to
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10 the following conditions:
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11
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12 The above copyright notice and this permission notice shall be
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13 included in all copies or substantial portions of the Software.
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14
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15 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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16 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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17 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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18 IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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19 CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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20 TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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21 SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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22 */
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23
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24 #include "lib.h"
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25 #include "utc-offset.h"
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26
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27 #include <sys/time.h>
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28
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29 int utc_offset(struct tm *tm, time_t t __attr_unused__)
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30 {
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31 #ifdef HAVE_TM_GMTOFF
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32 return (int) (tm->tm_gmtoff/60);
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33 #else
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34 struct tm ltm, gtm;
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35 int offset;
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36
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37 /* gmtime() overwrites tm, so we need to copy it elsewhere */
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38 ltm = *tm;
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39 tm = gmtime(&t);
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40 gtm = *tm;
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41
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42 /* max offset of 24 hours */
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43 if (ltm.tm_yday < gtm.tm_yday)
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44 offset = -24 * 60;
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45 else if (ltm.tm_yday > gtm.tm_yday)
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46 offset = 24 * 60;
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47 else
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48 offset = 0;
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49
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50 offset += (ltm.tm_hour - gtm.tm_hour) * 60;
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51 offset += (ltm.tm_min - gtm.tm_min);
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52
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53 /* restore overwritten tm */
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54 *tm = ltm;
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55 return offset;
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56 #endif
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57 }