time.cc

Go to the documentation of this file.
00001 ///
00002 /// \file       time.cc
00003 ///             Conversion between time_t and cenmin_t and back.
00004 ///             time_t is the POSIX time, seconds from Jan 1, 1970
00005 ///             min1900_t is the minutes from Jan 1, 1900
00006 ///
00007 
00008 /*
00009     Copyright (C) 2005-2010, Net Direct Inc. (http://www.netdirect.ca/)
00010 
00011     This program is free software; you can redistribute it and/or modify
00012     it under the terms of the GNU General Public License as published by
00013     the Free Software Foundation; either version 2 of the License, or
00014     (at your option) any later version.
00015 
00016     This program is distributed in the hope that it will be useful,
00017     but WITHOUT ANY WARRANTY; without even the implied warranty of
00018     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
00019 
00020     See the GNU General Public License in the COPYING file at the
00021     root directory of this project for more details.
00022 */
00023 
00024 #include "time.h"
00025 #include "endian.h"
00026 #include "debug.h"
00027 
00028 namespace Barry {
00029 
00030 TimeZone Zones[] = {
00031         { 0x0000,  -12,   0, "Eniwetok, Kwajalein (-12)" },
00032         { 0x0001,  -12,   0, "Midway Island, Samoa (-12)" },
00033         { 0x0002,  -10,   0, "Hawaii (-10)" },
00034         { 0x0003,   -9,   0, "Alaska (-9)" },
00035         { 0x0004,   -8,   0, "Pacific Time (US & Canada), Tijuana (-8)" },
00036         { 0x000a,   -7,   0, "Mountain Time (US & Canada) (-7)" },
00037         { 0x000f,   -7,   0, "Arizona (-7)" },
00038         { 0x000d,   -7,   0, "Chihuahua, La Paz, Mazatlan (-7)" },
00039         { 0x0014,   -6,   0, "Central Time (US & Canada) (-6)" },
00040         { 0x0021,   -6,   0, "Central America (-6)" },
00041         { 0x0019,   -6,   0, "Saskatchewan (-6)" },
00042         { 0x001e,   -6,   0, "Mexico City (-6)" },
00043         { 0x0023,   -5,   0, "Eastern Time (US & Canada) (-5)" },
00044         { 0x002d,   -5,   0, "Bogota, Lima, Quito (-5)" },
00045         { 0x0028,   -5,   0, "Indiana (East) (-5)" },
00046         { 0x0032,   -4,   0, "Atlantic Time (Canada) (-4)" },
00047         { 0x0037,   -4,   0, "Caracas, La Paz (-4)" },
00048         { 0x0038,   -4,   0, "Santiago (-4)" },
00049         { 0x003c,   -3, -30, "Newfoundland (-3.5)" },
00050         { 0x0046,   -3,   0, "Buenos Aires, Georgetown (-3)" },
00051         { 0x0041,   -3,   0, "Brasilia (-3)" },
00052         { 0x0049,   -3,   0, "Greenland (-3)" },
00053         { 0x004b,   -2,   0, "Mid-Atlantic (-2)" },
00054         { 0x0053,   -1,   0, "Cape Verde Island (-1)" },
00055         { 0x0050,   -1,   0, "Azores (-1)" },
00056         { 0x0055,    0,   0, "Dublin, Edinburgh, Lisbon, London (GMT)" },
00057         { 0x005a,    0,   0, "Casablanca, Monrovia (GMT)" },
00058         { 0x006e,    1,   0, "Amsterdam, Berlin, Bern, Rome, Stockholm, Vienna (+1)" },
00059         { 0x0071,    1,   0, "West Central Africa (+1)" },
00060         { 0x005f,    1,   0, "Belgrade, Bratislava, Budapest, Ljubljana, Prague (+1)" },
00061         { 0x0069,    1,   0, "Brussels, Copenhagen, Madrid, Paris (+1)" },
00062         { 0x0064,    1,   0, "Sarajevo, Skopje, Sofija, Vilnius, Warsaw, Zagreb (+1)" },
00063         { 0x008c,    2,   0, "Harare, Pretoria (+2)" },
00064         { 0x0087,    2,   0, "Jerusalem (+2)" },
00065         { 0x0073,    2,   0, "Bucharest (+2)" },
00066         { 0x0078,    2,   0, "Cairo (+2)" },
00067         { 0x0082,    2,   0, "Athens, Istanbul, Minsk (+2)" },
00068         { 0x007d,    2,   0, "Helsinki, Riga, Tallinn (+2)" },
00069         { 0x0096,    3,   0, "Kuwait, Riyadh (+3)" },
00070         { 0x009b,    3,   0, "Nairobi (+3)" },
00071         { 0x009e,    3,   0, "Baghdad (+3)" },
00072         { 0x0091,    3,   0, "Moscow, St. Petersburg, Volgograd (+3)" },
00073         { 0x00a0,    3,  30, "Tehran (+3.5)" },
00074         { 0x00a5,    4,   0, "Abu Dhabi, Muscat (+4)" },
00075         { 0x00aa,    4,   0, "Baku, Tbilisi, Yerevan (+4)" },
00076         { 0x00af,    4,  30, "Kabul (+4.5)" },
00077         { 0x00b9,    5,   0, "Islamabad, Karachi, Tashkent (+5)" },
00078         { 0x00b4,    5,   0, "Ekaterinburg (+5)" },
00079         { 0x00be,    5,  30, "Calcutta, Chennai, Mumbai, New Delhi (+5.5)" },
00080         { 0x00c1,    5,  45, "Kathmandu (+5.75)" },
00081         { 0x00c3,    6,   0, "Astana, Dhaka (+6)" },
00082         { 0x00c8,    6,   0, "Sri Lanka (+6)" },
00083         { 0x00c9,    6,   0, "Almaty, Novosibirsk (+6)" },
00084         { 0x00cb,    6,  30, "Rangoon (+6.5)" },
00085         { 0x00cd,    7,   0, "Bangkok, Hanoi, Jakarta (+7)" },
00086         { 0x00cf,    7,   0, "Krasnoyarsk (+7)" },
00087         { 0x00d2,    8,   0, "Beijing, Chongqing, Hong Kong, Urumqi (+8)" },
00088         { 0x00d7,    8,   0, "Kuala Lumpur, Singapore (+8)" },
00089         { 0x00e1,    8,   0, "Perth (+8)" },
00090         { 0x00dc,    8,   0, "Taipei (+8)" },
00091         { 0x00e3,    8,   0, "Irkutsk, Ulaan Bataar (+8)" },
00092         { 0x00eb,    9,   0, "Osaka, Sapporo, Tokyo (+9)" },
00093         { 0x00e6,    9,   0, "Seoul (+9)" },
00094         { 0x00f0,    9,   0, "Yakutsk (+9)" },
00095         { 0x00f5,    9,  30, "Darwin (+9.5)" },
00096         { 0x00fa,    9,  30, "Adelaide (+9.5)" },
00097         { 0x0104,   10,   0, "Brisbane (+10)" },
00098         { 0x0113,   10,   0, "Guam, Port Moresby (+10)" },
00099         { 0x00ff,   10,   0, "Canberra, Melbourne, Sydney (+10)" },
00100         { 0x0109,   10,   0, "Hobart (+10)" },
00101         { 0x010e,   10,   0, "Vladivostok (+10)" },
00102         { 0x0118,   11,   0, "Magadan, Solomon Islands, New Caledonia (+11)" },
00103         { 0x011d,   12,   0, "Fiji, Kamchatka, Marshall Islands (+12)" },
00104         { 0x0122,   12,   0, "Auckland, Wellington (+12)" },
00105         { 0x012c,   13,   0, "Nuku'alofa (+13)" },
00106         { 0,         0,   0, 0 }
00107 };
00108 
00109 min1900_t time2min(time_t t)
00110 {
00111         if( t == 0 )
00112                 return htobl(0xffffffff);
00113 
00114         min1900_t r = t / 60 + STDC_MIN1900_DIFF;
00115         return htobl(r);
00116 }
00117 
00118 time_t min2time(min1900_t m)
00119 {
00120         if( (unsigned long) btohl(m) == 0xffffffff )
00121                 return 0;
00122         else
00123                 return (btohl(m) - STDC_MIN1900_DIFF) * 60;
00124 }
00125 
00126 
00127 //
00128 // GetTimeZoneTable
00129 //
00130 /// Returns a pointer to an array of TimeZone structs.
00131 /// The last struct contains 0 in all fields, and can be used as
00132 /// an "end of array" marker.
00133 ///
00134 const TimeZone* GetTimeZoneTable()
00135 {
00136         return Zones;
00137 }
00138 
00139 //
00140 // GetTimeZone
00141 //
00142 /// Searches the internal timezone code table for the given Code
00143 /// and returns a pointer to a TimeZone struct found.  If the
00144 /// code is not found, a pointer to a valid TimeZone struct is
00145 /// is still returned, but the struct's Code contains TIME_ZONE_CODE_ERR,
00146 /// and the name is "Unknown time zone."  The unknown timezone
00147 /// is the same offset as GMT.
00148 ///
00149 const TimeZone* GetTimeZone(unsigned short Code)
00150 {
00151         static TimeZone Unknown = { TIME_ZONE_CODE_ERR, 0, 0, "Unknown time zone" };
00152 
00153         for( TimeZone *z = Zones; z->Name; z++ ) {
00154                 if( Code == z->Code )
00155                         return z;
00156         }
00157         return &Unknown;
00158 }
00159 
00160 //
00161 // GetTimeZoneCode
00162 //
00163 /// Searches the internal timezone table for the first matching
00164 /// Code.  If no matching Code is found, TIME_ZONE_CODE_ERR is returned.
00165 ///
00166 /// This function does not adjust for daylight saving time.
00167 ///
00168 unsigned short GetTimeZoneCode(signed short HourOffset,
00169                                signed short MinOffset)
00170 {
00171         for( TimeZone *z = Zones; z->Name; z++ ) {
00172                 if( HourOffset == z->HourOffset && MinOffset == z->MinOffset )
00173                         return z->Code;
00174         }
00175         return TIME_ZONE_CODE_ERR;
00176 }
00177 
00178 /// This routine takes the day of the year and
00179 /// returns a time_t adjusted from the first of
00180 /// the year.
00181 ///
00182 /// FIXME This function assumes the year hasn't changed,
00183 /// but I don't have enough information to determine
00184 /// where the year is in this header info
00185 ///
00186 time_t DayToDate( unsigned short Day )
00187 {
00188         struct tm *now, then;
00189         time_t t = time( NULL );
00190 
00191         now = localtime( &t ); // need this to get year
00192         // set to Jan 1 midnight, this year;
00193         then.tm_sec = 0;
00194         then.tm_min = 0;
00195         then.tm_hour = 0;
00196         then.tm_mday = 0;
00197         then.tm_mon = 0;
00198         then.tm_year = now->tm_year;
00199         then.tm_isdst = -1;
00200         t = mktime(&then);
00201         t -= 60*60;                     // need to subract an hour
00202         t += Day * 24 * 60 * 60;        // Add the day converted to seconds
00203 
00204         return t;
00205 }
00206 
00207 //
00208 // Message2Time
00209 //
00210 /// Localize the funky math used to convert a Blackberry message
00211 /// timestamp into a time_t.
00212 ///
00213 /// Both r_date and r_time are expected to be fed in from the
00214 /// Protocol::MessageRecord struct in raw form, without endian
00215 /// conversion.  This function handles that.
00216 ///
00217 time_t Message2Time(uint16_t r_date, uint16_t r_time)
00218 {
00219         dout("Message2Time(0x" << std::hex << btohs(r_date) << ", 0x"
00220                 << btohs(r_time) << ")");
00221 
00222         time_t result = ( btohs(r_date) & 0x01ff ) - 0x29;
00223         result = DayToDate( result );
00224         result += (time_t)( btohs(r_time)*1.77 );
00225 
00226         dout("Message2Time result: " << ctime(&result));
00227         return result;
00228 }
00229 
00230 //
00231 // ThreadTimeout
00232 //
00233 /// Creates a pthread_cond_timedwait() compatible timespec struct,
00234 /// based on a given timeout in milliseconds.  Note that the resulting
00235 /// timespec is time-sensitive: the 'timer' starts as soon as this function
00236 /// returns, since timespec is a specific time in the future,
00237 /// and ThreadTimeout() calculates it based on the current time.
00238 ///
00239 /// Returns the spec pointer, to make it easy to use with
00240 /// pthread_cond_timedwait()
00241 ///
00242 BXEXPORT struct timespec* ThreadTimeout(int timeout_ms, struct timespec *spec)
00243 {
00244         struct timeval now;
00245         gettimeofday(&now, NULL);
00246 
00247         spec->tv_sec = now.tv_sec + timeout_ms / 1000;
00248         spec->tv_nsec = (now.tv_usec + timeout_ms % 1000 * 1000) * 1000;
00249 
00250         return spec;
00251 }
00252 
00253 
00254 
00255 } // namespace Barry
00256 
00257 
00258 #ifdef __TEST_MODE__
00259 
00260 #include <iostream>
00261 #include <iomanip>
00262 
00263 using namespace std;
00264 using namespace Barry;
00265 
00266 void display(const char *msg, time_t t)
00267 {
00268         cout << msg << ": " << ctime(&t);
00269         cout << msg << " seconds: "
00270                 << setbase(10) << t
00271                 << "(0x" << setbase(16) << t << ")"
00272                 << endl;
00273         cout << msg << " minutes: "
00274                 << setbase(10) << (t/60)
00275                 << "(0x" << setbase(16) << (t/60) << ")"
00276                 << endl;
00277         cout << endl;
00278 }
00279 
00280 void calc(const char *msg, time_t t, min1900_t dbval)
00281 {
00282         cout << msg << endl;
00283         display("    Initial time", t);
00284         display("    DB Val", min2time(dbval));
00285 }
00286 
00287 int main()
00288 {
00289         struct tm start;
00290         time_t t;
00291 
00292         // set to Oct 4, 2005, 2pm;
00293         start.tm_sec = 0;
00294         start.tm_min = 0;
00295         start.tm_hour = 14;
00296         start.tm_mday = 4;
00297         start.tm_mon = 9;
00298         start.tm_year = 105;
00299         start.tm_isdst = -1;
00300         t = mktime(&start);
00301         calc("Oct 4", t, 0x0350c118);
00302 
00303         // comparison
00304         t = time(NULL);
00305         min1900_t m = time2min(t);
00306         time_t tc = min2time(m);
00307         cout << "Original time: " << t << endl;
00308         cout << "time2min:      " << m << endl;
00309         cout << "min2time:      " << tc << endl;
00310         if( t == (tc + t % 60) )
00311                 cout << "Success! (orig == converted + mod)" << endl;
00312         else
00313                 cout << "Failed!" << endl;
00314 
00315         // time zone
00316         cout << "Should say Eastern: " << GetTimeZone(0x23)->Name << endl;
00317         cout << "should say Unknown: " << GetTimeZone(0xffff)->Name << endl;
00318 }
00319 
00320 #endif
00321 
Generated by  doxygen 1.6.2-20100208