wmcalendar/Src/calendarfunc.h

   1 /* persian calendar functions original code is by Kees Couprie
   2    http://www.geocities.com/couprie/calmath/      */
   3
   4 /* islamic conversion and moonphase calculation is taken from
   5  *
   6  * hdate
   7  *
   8  * Copyright (c) 1992 by Waleed A. Muhanna
   9  *
  10  * Permission for nonprofit use and redistribution of this software and
  11  * its documentation is hereby granted without fee, provided that the
  12  * above copyright notice appear in all copies and that both that copyright
  13  * notice and this permission notice appear in supporting documentation.
  14  *
  15  * No representation is made about the suitability of this software for any
  16  * purpose.  It is provided "as is" without express or implied warranty.
  17  *
  18  * Send any comments/suggestions/fixes/additions to:
  19  *              wmuhanna@magnus.acs.ohio-state.edu
  20  *
  21  */
  22
  23 #include <unistd.h>
  24 #include <stdlib.h>
  25 #include <libical/ical.h>
  26 #include <math.h>
  27 #define TIMZ 3.0
  28 #define MINAGE 13.5
  29 #define SUNSET 19.5 /*approximate */
  30 #define TIMDIF (SUNSET-MINAGE)
  31 #define NMONTHS  (1405*12+1)
  32 #define RPD     (0.01745329251994329577) /* radians per degree (pi/180) */
  33 /*general*/
  34 int days_in_month(int month, int year, int calendar);
  35 int day_of_week(struct icaltimetype dt);
  36
  37 /* related to gregorian calendar*/
  38 struct icaltimetype get_civil(struct icaltimetype dt, int calendar);
  39 long civil_jdn(struct icaltimetype dt);
  40 struct icaltimetype jdn_civil(long jdn);
  41 int isGregorianLeap(int year);
  42 int days_in_gregorian_month(int month, int year);
  43
  44 /*related to persian calendar*/
  45 long persian_jdn(struct icaltimetype dt);
  46 struct icaltimetype jdn_persian(long jdn);
  47 struct icaltimetype civil_persian(struct icaltimetype dt);
  48 struct icaltimetype persian_civil(struct icaltimetype dt);
  49 int isPersianLeap(int year);
  50 int days_in_persian_month(int month, int year);
  51
  52 /*related to islamic calendar*/
  53 long islamic_jdn(struct icaltimetype dt);
  54 struct icaltimetype jdn_islamic(long jdn);
  55 struct icaltimetype civil_islamic(struct icaltimetype dt);
  56 struct icaltimetype islamic_civil(struct icaltimetype dt);
  57 int days_in_islamic_month(int month, int year);
  58
  59
  60 /*moonphase*/
  61 int moon(struct icaltimetype dt);
  62
  63
  64 /*day comparing functions*/
  65 int daysComp(struct icaltimetype d1, struct icaltimetype d2);
  66 int daysEqual(struct icaltimetype d1, struct icaltimetype d2);
  67 int daysLater(struct icaltimetype d1, struct icaltimetype d2);
  68 int daysEarlier(struct icaltimetype d1, struct icaltimetype d2);
  69 int daysLaterEqual(struct icaltimetype d1, struct icaltimetype d2);
  70 int daysEarlierEqual(struct icaltimetype d1, struct icaltimetype d2);
  71
  72 int Ceil(float number);
  73
  74 int     datemoon[200][2];   /* hashtable for moonphase.[jdn%32][0] stores moonphase of day jdn,
  75                             [jdn%32][1] stores jdn. */