[5503] | 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 "";
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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 "";
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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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