1 | #include <machine/rtems-bsd-user-space.h> |
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2 | |
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3 | /* |
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4 | * Copyright (c) 1997 |
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5 | * The Regents of the University of California. All rights reserved. |
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6 | * |
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7 | * Redistribution and use in source and binary forms, with or without |
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8 | * modification, are permitted provided that: (1) source code distributions |
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9 | * retain the above copyright notice and this paragraph in its entirety, (2) |
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10 | * distributions including binary code include the above copyright notice and |
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11 | * this paragraph in its entirety in the documentation or other materials |
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12 | * provided with the distribution, and (3) all advertising materials mentioning |
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13 | * features or use of this software display the following acknowledgement: |
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14 | * ``This product includes software developed by the University of California, |
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15 | * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of |
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16 | * the University nor the names of its contributors may be used to endorse |
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17 | * or promote products derived from this software without specific prior |
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18 | * written permission. |
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19 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED |
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20 | * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF |
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21 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. |
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22 | */ |
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23 | |
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24 | #ifndef lint |
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25 | static const char rcsid[] _U_ = |
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26 | "@(#) $Header: /tcpdump/master/tcpdump/gmt2local.c,v 1.9 2003-11-16 09:36:09 guy Exp $ (LBL)"; |
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27 | #endif |
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28 | |
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29 | #ifdef HAVE_CONFIG_H |
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30 | #include "config.h" |
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31 | #endif |
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32 | |
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33 | #include <tcpdump-stdinc.h> |
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34 | |
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35 | #include <stdio.h> |
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36 | |
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37 | #ifdef HAVE_OS_PROTO_H |
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38 | #include "os-proto.h" |
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39 | #endif |
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40 | |
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41 | #include "gmt2local.h" |
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42 | |
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43 | /* |
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44 | * Returns the difference between gmt and local time in seconds. |
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45 | * Use gmtime() and localtime() to keep things simple. |
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46 | */ |
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47 | int32_t |
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48 | gmt2local(time_t t) |
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49 | { |
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50 | register int dt, dir; |
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51 | register struct tm *gmt, *loc; |
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52 | struct tm sgmt; |
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53 | |
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54 | if (t == 0) |
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55 | t = time(NULL); |
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56 | gmt = &sgmt; |
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57 | *gmt = *gmtime(&t); |
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58 | loc = localtime(&t); |
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59 | dt = (loc->tm_hour - gmt->tm_hour) * 60 * 60 + |
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60 | (loc->tm_min - gmt->tm_min) * 60; |
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61 | |
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62 | /* |
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63 | * If the year or julian day is different, we span 00:00 GMT |
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64 | * and must add or subtract a day. Check the year first to |
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65 | * avoid problems when the julian day wraps. |
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66 | */ |
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67 | dir = loc->tm_year - gmt->tm_year; |
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68 | if (dir == 0) |
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69 | dir = loc->tm_yday - gmt->tm_yday; |
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70 | dt += dir * 24 * 60 * 60; |
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71 | |
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72 | return (dt); |
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73 | } |
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