1 | // |
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2 | // Timezone_UNIX.cpp |
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3 | // |
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4 | // $Id: //poco/1.3/Foundation/src/Timezone_UNIX.cpp#3 $ |
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5 | // |
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6 | // Library: Foundation |
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7 | // Package: DateTime |
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8 | // Module: Timezone |
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9 | // |
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10 | // Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH. |
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11 | // and Contributors. |
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12 | // |
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13 | // Permission is hereby granted, free of charge, to any person or organization |
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14 | // obtaining a copy of the software and accompanying documentation covered by |
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15 | // this license (the "Software") to use, reproduce, display, distribute, |
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16 | // execute, and transmit the Software, and to prepare derivative works of the |
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17 | // Software, and to permit third-parties to whom the Software is furnished to |
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18 | // do so, all subject to the following: |
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19 | // |
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20 | // The copyright notices in the Software and this entire statement, including |
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21 | // the above license grant, this restriction and the following disclaimer, |
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22 | // must be included in all copies of the Software, in whole or in part, and |
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23 | // all derivative works of the Software, unless such copies or derivative |
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24 | // works are solely in the form of machine-executable object code generated by |
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25 | // a source language processor. |
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26 | // |
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27 | // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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28 | // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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29 | // FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT |
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30 | // SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE |
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31 | // FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE, |
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32 | // ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER |
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33 | // DEALINGS IN THE SOFTWARE. |
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34 | // |
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35 | |
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36 | |
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37 | #include <Poco/Timezone.h> |
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38 | #include <Poco/Exception.h> |
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39 | #include <ctime> |
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40 | |
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41 | |
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42 | namespace Poco { |
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43 | |
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44 | |
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45 | class TZInfo |
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46 | { |
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47 | public: |
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48 | TZInfo() |
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49 | { |
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50 | tzset(); |
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51 | } |
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52 | |
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53 | int timeZone() |
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54 | { |
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55 | #if defined(__APPLE__) || defined(__FreeBSD__) // no timezone global var |
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56 | std::time_t now = std::time(NULL); |
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57 | struct std::tm t; |
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58 | gmtime_r(&now, &t); |
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59 | std::time_t utc = std::mktime(&t); |
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60 | return now - utc; |
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61 | #elif defined(__CYGWIN__) |
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62 | return -_timezone; |
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63 | #else |
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64 | return -timezone; |
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65 | #endif |
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66 | } |
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67 | |
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68 | const char* name(bool dst) |
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69 | { |
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70 | return tzname[dst ? 1 : 0]; |
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71 | } |
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72 | }; |
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73 | |
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74 | |
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75 | static TZInfo tzInfo; |
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76 | |
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77 | |
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78 | int Timezone::utcOffset() |
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79 | { |
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80 | return tzInfo.timeZone(); |
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81 | } |
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82 | |
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83 | |
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84 | int Timezone::dst() |
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85 | { |
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86 | std::time_t now = std::time(NULL); |
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87 | struct std::tm t; |
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88 | if (!localtime_r(&now, &t)) |
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89 | throw Poco::SystemException("cannot get local time DST offset"); |
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90 | return t.tm_isdst == 1 ? 3600 : 0; |
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91 | } |
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92 | |
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93 | |
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94 | bool Timezone::isDst(const Timestamp& timestamp) |
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95 | { |
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96 | std::time_t time = timestamp.epochTime(); |
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97 | struct std::tm* tms = std::localtime(&time); |
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98 | if (!tms) throw Poco::SystemException("cannot get local time DST flag"); |
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99 | return tms->tm_isdst > 0; |
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100 | } |
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101 | |
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102 | |
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103 | std::string Timezone::name() |
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104 | { |
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105 | return std::string(tzInfo.name(dst() != 0)); |
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106 | } |
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107 | |
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108 | |
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109 | std::string Timezone::standardName() |
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110 | { |
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111 | return std::string(tzInfo.name(false)); |
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112 | } |
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113 | |
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114 | |
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115 | std::string Timezone::dstName() |
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116 | { |
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117 | return std::string(tzInfo.name(true)); |
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118 | } |
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119 | |
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120 | |
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121 | } // namespace Poco |
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