130 lines
4.2 KiB
C++
130 lines
4.2 KiB
C++
/* -*- Mode: C++ -*- *****************************************************
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* lowleveltime.h
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* Written by various people (I"ll look up the exact credits later)
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* Modified by Durk Talsma, July 1999 for use in FlightGear
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*
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**************************************************************************/
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/********************************************************************
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* This file redefines some low-level Unix-like time functions for *
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* use with FlightGear. Most notably, localtime() is adapted to use *
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* a custom timezone, in order to get the 'local' time for a given *
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* aircraft's position, and not only for the current location of the*
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* computer running the sim. *
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* *
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* Software adapted from glibc functions, by Durk Talsma. Started *
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* July, 17, 1999. *
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********************************************************************/
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#ifndef _LOWLEVELTIME_H_
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#define _LOWLEVELTIME_H_
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#include <time.h>
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/* adapted from zdump.c */
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void show (const char *zone, time_t t, int v);
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/* adapted from <time.h> */
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struct tm * fgLocaltime (const time_t *t, const char *tzName);
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/* Prototype for the internal function to get information based on TZ. */
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extern struct tm *fgtz_convert (const time_t *t, int use_localtime,
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struct tm *tp, const char *tzName);
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/* This structure contains all the information about a
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timezone given in the POSIX standard TZ envariable. */
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typedef struct
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{
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const char *name;
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/* When to change. */
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enum { J0, J1, M } type; /* Interpretation of: */
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unsigned short int m, n, d; /* Month, week, day. */
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unsigned int secs; /* Time of day. */
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long int offset; /* Seconds east of GMT (west if < 0). */
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/* We cache the computed time of change for a
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given year so we don't have to recompute it. */
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time_t change; /* When to change to this zone. */
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int computed_for; /* Year above is computed for. */
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} fgtz_rule;
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struct tzhead {
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char tzh_magic[4]; /* TZ_MAGIC */
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char tzh_reserved[16]; /* reserved for future use */
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char tzh_ttisgmtcnt[4]; /* coded number of trans. time flags */
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char tzh_ttisstdcnt[4]; /* coded number of trans. time flags */
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char tzh_leapcnt[4]; /* coded number of leap seconds */
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char tzh_timecnt[4]; /* coded number of transition times */
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char tzh_typecnt[4]; /* coded number of local time types */
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char tzh_charcnt[4]; /* coded number of abbr. chars */
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};
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/* Defined in mktime.c. */
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extern const unsigned short int mon_yday[2][13];
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#ifndef TZDIR
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#define TZDIR "/usr/local/etc/zoneinfo" /* Time zone object file directory */
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#endif /* !defined TZDIR */
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#ifndef TZDEFAULT
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#define TZDEFAULT "localtime"
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#endif /* !defined TZDEFAULT */
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#define SECSPERMIN 60
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#define MINSPERHOUR 60
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#define HOURSPERDAY 24
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#define DAYSPERWEEK 7
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#define DAYSPERNYEAR 365
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#define DAYSPERLYEAR 366
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#define SECSPERHOUR (SECSPERMIN * MINSPERHOUR)
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#define SECSPERDAY ((long) SECSPERHOUR * HOURSPERDAY)
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#define MONSPERYEAR 12
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#define TM_SUNDAY 0
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#define TM_MONDAY 1
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#define TM_TUESDAY 2
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#define TM_WEDNESDAY 3
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#define TM_THURSDAY 4
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#define TM_FRIDAY 5
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#define TM_SATURDAY 6
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#define TM_JANUARY 0
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#define TM_FEBRUARY 1
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#define TM_MARCH 2
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#define TM_APRIL 3
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#define TM_MAY 4
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#define TM_JUNE 5
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#define TM_JULY 6
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#define TM_AUGUST 7
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#define TM_SEPTEMBER 8
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#define TM_OCTOBER 9
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#define TM_NOVEMBER 10
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#define TM_DECEMBER 11
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#define TM_YEAR_BASE 1900
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#define EPOCH_YEAR 1970
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#define EPOCH_WDAY TM_THURSDAY
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#endif
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