greenplumn pgtz 源码
greenplumn pgtz 代码
文件路径：/src/timezone/pgtz.h
/*-------------------------------------------------------------------------
*
* 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) 1996-2019, PostgreSQL Global Development Group
*
* IDENTIFICATION
* src/timezone/pgtz.h
*
*-------------------------------------------------------------------------
*/
#ifndef _PGTZ_H
#define _PGTZ_H
#include "pgtime.h"
#include "tzfile.h"
#define SMALLEST(a, b) (((a) < (b)) ? (a) : (b))
#define BIGGEST(a, b) (((a) > (b)) ? (a) : (b))
struct ttinfo
{ /* time type information */
int32 tt_utoff; /* UT offset in seconds */
bool tt_isdst; /* used to set tm_isdst */
int tt_desigidx; /* abbreviation list index */
bool tt_ttisstd; /* transition is std time */
bool tt_ttisut; /* transition is UT */
};
struct lsinfo
{ /* leap second information */
pg_time_t ls_trans; /* transition time */
int64 ls_corr; /* correction to apply */
};
struct state
{
int leapcnt;
int timecnt;
int typecnt;
int charcnt;
bool goback;
bool 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, 4 /* sizeof gmt */ ),
(2 * (TZ_STRLEN_MAX + 1)))];
struct lsinfo lsis[TZ_MAX_LEAPS];
/*
* The time type to use for early times or if no transitions. It is always
* zero for recent tzdb releases. It might be nonzero for data from tzdb
* 2018e or earlier.
*/
int defaulttype;
};
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,
bool doextend);
extern bool tzparse(const char *name, struct state *sp, bool lastditch);
#endif /* _PGTZ_H */
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