1 | /**********************************************************************
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2 | *
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3 | * gsdltimes.cpp -- functions to deal with time
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4 | * Copyright (C) 1999 DigiLib Systems Limited, New Zealand
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5 | *
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6 | * A component of the Greenstone digital library software
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7 | * from the New Zealand Digital Library Project at the
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8 | * University of Waikato, New Zealand.
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9 | *
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10 | * This program is free software; you can redistribute it and/or modify
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11 | * it under the terms of the GNU General Public License as published by
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12 | * the Free Software Foundation; either version 2 of the License, or
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13 | * (at your option) any later version.
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14 | *
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15 | * This program is distributed in the hope that it will be useful,
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16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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18 | * GNU General Public License for more details.
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19 | *
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20 | * You should have received a copy of the GNU General Public License
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21 | * along with this program; if not, write to the Free Software
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22 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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23 | *
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24 | *********************************************************************/
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25 |
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26 | #include "gsdltimes.h"
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27 |
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28 | // returns a string of the form "YYYY/MM/DD hh:mm:ss" (expressed in
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29 | // Coordinated Universal Time (UTC))
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30 | // returns "" if an error occurs
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31 | // !! Actually, we now return a string in localtime, as text2time returns
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32 | // a time in localtime (mktime assumes local timezone). - jrm21 Sep 2002
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33 | text_t time2text (time_t time) {
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34 | // tm *tm_ptr = gmtime(&time);
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35 | tm *tm_ptr = localtime(&time);
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36 |
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37 | if (tm_ptr == NULL) return g_EmptyText;
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38 |
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39 | // year
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40 | text_t timestr(tm_ptr->tm_year+1900);
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41 | timestr.push_back('/');
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42 |
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43 | // month (note the +1)
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44 | if ((tm_ptr->tm_mon+1) < 10) timestr.push_back('0');
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45 | timestr += (tm_ptr->tm_mon+1);
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46 | timestr.push_back('/');
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47 |
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48 | // day
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49 | if (tm_ptr->tm_mday < 10) timestr.push_back('0');
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50 | timestr += tm_ptr->tm_mday;
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51 | timestr.push_back(' ');
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52 |
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53 | // hour
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54 | if (tm_ptr->tm_hour < 10) timestr.push_back('0');
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55 | timestr += tm_ptr->tm_hour;
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56 | timestr.push_back(':');
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57 |
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58 | // minutes
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59 | if (tm_ptr->tm_min < 10) timestr.push_back('0');
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60 | timestr += tm_ptr->tm_min;
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61 | timestr.push_back(':');
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62 |
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63 | // seconds
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64 | if (tm_ptr->tm_sec < 10) timestr.push_back('0');
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65 | timestr += tm_ptr->tm_sec;
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66 |
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67 | return timestr;
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68 | }
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69 |
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70 | // takes a string like that returned by time2text and returns corresponding time_t
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71 | // returns -1 if an error occurs
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72 | time_t text2time (const text_t ×tr) {
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73 | tm timetm;
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74 | text_t tempstr;
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75 |
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76 | text_t::const_iterator time_here = timestr.begin();
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77 | text_t::const_iterator time_end = timestr.end();
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78 |
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79 | // year
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80 | if (time_here == time_end) return (time_t) -1;
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81 | time_here = getdelimitstr (time_here, time_end, '/', tempstr);
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82 | timetm.tm_year = tempstr.getint() - 1900;
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83 | if (timetm.tm_year < 0) return (time_t) -1;
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84 |
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85 | // month (note the -1)
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86 | if (time_here == time_end) return (time_t) -1;
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87 | time_here = getdelimitstr (time_here, time_end, '/', tempstr);
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88 | timetm.tm_mon = tempstr.getint() - 1;
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89 | if (timetm.tm_mon < 0 || timetm.tm_mon > 11)
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90 | return (time_t) -1;
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91 |
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92 | // day
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93 | if (time_here == time_end) return (time_t) -1;
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94 | time_here = getdelimitstr (time_here, time_end, ' ', tempstr);
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95 | timetm.tm_mday = tempstr.getint();
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96 | if (timetm.tm_mday < 1 || timetm.tm_mday > 31)
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97 | return (time_t) -1;
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98 |
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99 | // hour
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100 | if (time_here == time_end) return (time_t) -1;
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101 | time_here = getdelimitstr (time_here, time_end, ':', tempstr);
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102 | timetm.tm_hour = tempstr.getint();
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103 | if (timetm.tm_hour < 0 || timetm.tm_hour > 23)
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104 | return (time_t) -1;
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105 |
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106 | // min
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107 | if (time_here == time_end) return (time_t) -1;
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108 | time_here = getdelimitstr (time_here, time_end, ':', tempstr);
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109 | timetm.tm_min = tempstr.getint();
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110 | if (timetm.tm_min < 0 || timetm.tm_min > 59)
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111 | return (time_t) -1;
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112 |
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113 | // sec
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114 | if (time_here == time_end) return (time_t) -1;
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115 | time_here = getdelimitstr (time_here, time_end, ':', tempstr);
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116 | timetm.tm_sec = tempstr.getint();
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117 | if (timetm.tm_sec < 0 || timetm.tm_sec > 59)
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118 | return (time_t) -1;
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119 |
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120 | timetm.tm_isdst=0;
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121 |
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122 | /* This is for darwin - mktime seems to use this, so don't leave it
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123 | uninitialised!! Maybe the same on freebsd/netbsd?
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124 | */
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125 | #if defined(__MACH__) && defined(__APPLE__)
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126 | timetm.tm_gmtoff=0;
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127 | #endif
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128 |
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129 | // mktime assumes timetm is localtime
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130 | return mktime (&timetm);
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131 | }
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132 |
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133 | // returns current date and time formatted like "Thu Dec 07 23:43:38 GMT 2000"
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134 | // if ltime is true return value will be expressed in local time, otherwise
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135 | // it'll be Coordinated Universal Time (UTC) - no promises are made that the
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136 | // resulting string will be formatted exactly as expected, especially on windows
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137 | // returns "" if an error occurs
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138 | text_t get_date (bool ltime) {
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139 |
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140 | tm *tm_ptr = NULL;
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141 | time_t t = time(NULL);
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142 | if (ltime) tm_ptr = localtime (&t);
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143 | else tm_ptr = gmtime (&t);
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144 | if (tm_ptr == NULL) return g_EmptyText;
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145 | char *timestr = new char[128];
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146 | text_t ret;
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147 |
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148 | // we do this in such an ugly way because windows is kind of flakey when
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149 | // it comes to timezones
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150 | if (ltime) {
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151 | strftime (timestr, 128, "%a %b %d %H:%M:%S %z %Y", tm_ptr);
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152 | ret.setcstr (timestr);
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153 | } else {
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154 | strftime (timestr, 128, "%a %b %d %H:%M:%S", tm_ptr);
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155 | ret.setcstr (timestr);
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156 | ret += " GMT ";
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157 | strftime (timestr, 128, "%Y", tm_ptr);
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158 | ret += timestr;
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159 | }
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160 |
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161 | delete []timestr;
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162 | return ret;
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163 | }
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