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annotate src/lib/utc-offset.c @ 492:efa46e28a0d7 HEAD

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Fixes to timezone handling which were handling quite badly. added ioloop_timezone which gets updated with ioloop_time. Changed some GMT references to UTC. Timezone offsets are in minutes now everywhere instead of seconds. Fixes for unsigned time_t.
author Timo Sirainen <tss@iki.fi>
date Thu, 24 Oct 2002 03:15:38 +0300
parents
children 293aac070c2c
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492
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1 /*
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2 compat.c : Compatibility functions for OSes not having them
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3
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4 Copyright (c) 2002 Timo Sirainen
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5
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6 Permission is hereby granted, free of charge, to any person obtaining
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7 a copy of this software and associated documentation files (the
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8 "Software"), to deal in the Software without restriction, including
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9 without limitation the rights to use, copy, modify, merge, publish,
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10 distribute, sublicense, and/or sell copies of the Software, and to
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11 permit persons to whom the Software is furnished to do so, subject to
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12 the following conditions:
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13
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14 The above copyright notice and this permission notice shall be
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15 included in all copies or substantial portions of the Software.
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16
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17 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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18 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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19 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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20 IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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21 CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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22 TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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23 SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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24 */
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25
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26 #include "lib.h"
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27 #include "utc-offset.h"
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28
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29 #include <sys/time.h>
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30
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31 int utc_offset(struct tm *tm, time_t t __attr_unused__)
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32 {
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33 #ifdef HAVE_TM_GMTOFF
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34 return (int) (tm->tm_gmtoff/60);
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35 #else
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36 struct tm ltm, gtm;
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37 int offset;
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38
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39 /* gmtime() overwrites tm, so we need to copy it elsewhere */
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40 ltm = *tm;
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41 tm = gmtime(&t);
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42 gtm = *tm;
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43
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44 /* max offset of 24 hours */
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45 if (ltm.tm_yday < gtm.tm_yday)
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46 offset = -24 * 60;
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47 else if (ltm.tm_yday > gtm.tm_yday)
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48 offset = 24 * 60;
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49 else
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50 offset = 0;
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51
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52 offset += (ltm.tm_hour - gtm.tm_hour) * 60;
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53 offset += (ltm.tm_min - gtm.tm_min);
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54
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55 /* restore overwritten tm */
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56 *tm = ltm;
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57 return offset;
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58 #endif
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59 }