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/*-------------------------------------------------------------------------
*
* compat.c
* Reimplementations of various backend functions.
*
* Portions Copyright (c) 2013-2020, PostgreSQL Global Development Group
*
* IDENTIFICATION
* src/bin/pg_waldump/compat.c
*
* This file contains client-side implementations for various backend
* functions that the rm_desc functions in *desc.c files rely on.
*
*-------------------------------------------------------------------------
*/
/* ugly hack, same as in e.g pg_controldata */
#define FRONTEND 1
#include "postgres.h"
#include <time.h>
#include "utils/datetime.h"
/* copied from timestamp.c */
pg_time_t
timestamptz_to_time_t(TimestampTz t)
{
pg_time_t result;
result = (pg_time_t) (t / USECS_PER_SEC +
((POSTGRES_EPOCH_JDATE - UNIX_EPOCH_JDATE) * SECS_PER_DAY));
return result;
}
/*
* Stopgap implementation of timestamptz_to_str that doesn't depend on backend
* infrastructure. This will work for timestamps that are within the range
* of the platform time_t type. (pg_time_t is compatible except for possibly
* being wider.)
*
* XXX the return value points to a static buffer, so beware of using more
* than one result value concurrently.
*
* XXX: The backend timestamp infrastructure should instead be split out and
* moved into src/common. That's a large project though.
*/
const char *
timestamptz_to_str(TimestampTz dt)
{
static char buf[MAXDATELEN + 1];
char ts[MAXDATELEN + 1];
char zone[MAXDATELEN + 1];
time_t result = (time_t) timestamptz_to_time_t(dt);
struct tm *ltime = localtime(&result);
strftime(ts, sizeof(ts), "%Y-%m-%d %H:%M:%S", ltime);
strftime(zone, sizeof(zone), "%Z", ltime);
snprintf(buf, sizeof(buf), "%s.%06d %s",
ts, (int) (dt % USECS_PER_SEC), zone);
return buf;
}
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