/*-
 * SPDX-License-Identifier: BSD-3-Clause
 *
 * Copyright (c) 1989, 1993, 1994
 *      The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/types.h>
#include <sys/uio.h>

#define SECSPERDAY      (24 * 60 * 60)
#define SECSPERHOUR     (60 * 60)
#define SECSPERMINUTE   (60)
#define MINSPERHOUR     (60)
#define HOURSPERDAY     (24)
#define FSECSPERDAY     (24.0 * 60.0 * 60.0)
#define FSECSPERHOUR    (60.0 * 60.0)
#define FSECSPERMINUTE  (60.0)
#define FMINSPERHOUR    (60.0)
#define FHOURSPERDAY    (24.0)

#define DAYSPERYEAR     365
#define DAYSPERLEAPYEAR 366

/* Not yet categorized */

extern struct passwd *pw;
extern int doall;
extern time_t t1, t2;
extern const char *calendarFile;
extern int yrdays;
extern struct fixs neaster, npaskha, ncny, nfullmoon, nnewmoon;
extern struct fixs nmarequinox, nsepequinox, njunsolstice, ndecsolstice;
extern double UTCOffset;
extern int EastLongitude;
#ifdef WITH_ICONV
extern const char *outputEncoding;
#endif

#define isleap(y) ((((y) % 4) == 0 && ((y) % 100) != 0) || ((y) % 400) == 0)

/* Flags to determine the returned values by determinestyle() in parsedata.c */
#define F_NONE                  0x00000
#define F_MONTH                 0x00001
#define F_DAYOFWEEK             0x00002
#define F_DAYOFMONTH            0x00004
#define F_MODIFIERINDEX         0x00008
#define F_MODIFIEROFFSET        0x00010
#define F_SPECIALDAY            0x00020
#define F_ALLMONTH              0x00040
#define F_ALLDAY                0x00080
#define F_VARIABLE              0x00100
#define F_EASTER                0x00200
#define F_CNY                   0x00400
#define F_PASKHA                0x00800
#define F_NEWMOON               0x01000
#define F_FULLMOON              0x02000
#define F_MAREQUINOX            0x04000
#define F_SEPEQUINOX            0x08000
#define F_JUNSOLSTICE           0x10000
#define F_DECSOLSTICE           0x20000
#define F_YEAR                  0x40000

#define STRING_EASTER           "Easter"
#define STRING_PASKHA           "Paskha"
#define STRING_CNY              "ChineseNewYear"
#define STRING_NEWMOON          "NewMoon"
#define STRING_FULLMOON         "FullMoon"
#define STRING_MAREQUINOX       "MarEquinox"
#define STRING_SEPEQUINOX       "SepEquinox"
#define STRING_JUNSOLSTICE      "JunSolstice"
#define STRING_DECSOLSTICE      "DecSolstice"

#define MAXCOUNT                125     /* Random number of maximum number of
                                         * repeats of an event. Should be 52
                                         * (number of weeks per year), if you
                                         * want to show two years then it
                                         * should be 104. If you are seeing
                                         * more than this you are using this
                                         * program wrong.
                                         */

/*
 * All the astronomical calculations are carried out for the meridian 120
 * degrees east of Greenwich.
 */
#define UTCOFFSET_CNY           8.0

extern int      debug;          /* show parsing of the input */
extern int      year1, year2;

/* events.c */
/*
 * Event sorting related functions:
 * - Use event_add() to create a new event
 * - Use event_continue() to add more text to the last added event
 * - Use event_print_all() to display them in time chronological order
 */
struct event *event_add(int, int, int, int, char *, char *);
void    event_continue(struct event *events, char *txt);
void    event_print_all(FILE *fp);
struct event {
        int     year;
        int     month;
        int     day;
        int     var;
        char    *text;
        char    *extra;
        struct event *next;
};

/* locale.c */

struct fixs {
        char    *name;
        size_t  len;
};

extern const char *days[];
extern const char *fdays[];
extern const char *fmonths[];
extern const char *months[];
extern const char *sequences[];
extern struct fixs fndays[8];           /* full national days names */
extern struct fixs fnmonths[13];        /* full national months names */
extern struct fixs ndays[8];            /* short national days names */
extern struct fixs nmonths[13];         /* short national month names */
extern struct fixs nsequences[10];

void    setnnames(void);
void    setnsequences(char *);

/* day.c */
extern const struct tm tm0;
extern char dayname[];
void    settimes(time_t,int before, int after, int friday, struct tm *tp1, struct tm *tp2);
time_t  Mktime(char *);

/* parsedata.c */
int     parsedaymonth(char *, int *, int *, int *, int *, char **);
void    dodebug(char *type);

/* io.c */
void    cal(void);
void    closecal(FILE *);
FILE    *opencalin(void);
FILE    *opencalout(void);

/* ostern.c / paskha.c */
int     paskha(int);
int     easter(int);
int     j2g(int);

/* dates.c */
extern int cumdaytab[][14];
extern int monthdaytab[][14];
extern int debug_remember;
void    generatedates(struct tm *tp1, struct tm *tp2);
void    dumpdates(void);
int     remember_ymd(int y, int m, int d);
int     remember_yd(int y, int d, int *rm, int *rd);
int     first_dayofweek_of_year(int y);
int     first_dayofweek_of_month(int y, int m);
int     walkthrough_dates(struct event **e);
void    addtodate(struct event *e);

/* pom.c */
#define MAXMOONS        18
void    pom(int year, double UTCoffset, int *fms, int *nms);
void    fpom(int year, double utcoffset, double *ffms, double *fnms);

/* sunpos.c */
void    equinoxsolstice(int year, double UTCoffset, int *equinoxdays, int *solsticedays);
void    fequinoxsolstice(int year, double UTCoffset, double *equinoxdays, double *solsticedays);
int     calculatesunlongitude30(int year, int degreeGMToffset, int *ichinesemonths);

#ifdef WITH_ICONV
void    set_new_encoding(void);
#endif