pgtz.h

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/*-------------------------------------------------------------------------
 *
 * pgtz.h
 *    Timezone Library Integration Functions
 *
 * Note: this file contains only definitions that are private to the
 * timezone library.  Public definitions are in pgtime.h.
 *
 * Portions Copyright (c) 1996-2013, PostgreSQL Global Development Group
 *
 * IDENTIFICATION
 *    src/timezone/pgtz.h
 *
 *-------------------------------------------------------------------------
 */
#ifndef _PGTZ_H
#define _PGTZ_H

#include "tzfile.h"
#include "pgtime.h"


#define BIGGEST(a, b)   (((a) > (b)) ? (a) : (b))

struct ttinfo
{                               /* time type information */
    long        tt_gmtoff;      /* UTC offset in seconds */
    int         tt_isdst;       /* used to set tm_isdst */
    int         tt_abbrind;     /* abbreviation list index */
    int         tt_ttisstd;     /* TRUE if transition is std time */
    int         tt_ttisgmt;     /* TRUE if transition is UTC */
};

struct lsinfo
{                               /* leap second information */
    pg_time_t   ls_trans;       /* transition time */
    long        ls_corr;        /* correction to apply */
};

struct state
{
    int         leapcnt;
    int         timecnt;
    int         typecnt;
    int         charcnt;
    int         goback;
    int         goahead;
    pg_time_t   ats[TZ_MAX_TIMES];
    unsigned char types[TZ_MAX_TIMES];
    struct ttinfo ttis[TZ_MAX_TYPES];
    char        chars[BIGGEST(BIGGEST(TZ_MAX_CHARS + 1, 3 /* sizeof gmt */ ),
                                          (2 * (TZ_STRLEN_MAX + 1)))];
    struct lsinfo lsis[TZ_MAX_LEAPS];
};


struct pg_tz
{
    /* TZname contains the canonically-cased name of the timezone */
    char        TZname[TZ_STRLEN_MAX + 1];
    struct state state;
};


/* in pgtz.c */
extern int  pg_open_tzfile(const char *name, char *canonname);

/* in localtime.c */
extern int tzload(const char *name, char *canonname, struct state * sp,
       int doextend);
extern int  tzparse(const char *name, struct state * sp, int lastditch);

#endif   /* _PGTZ_H */