65 lines
1.8 KiB
C
65 lines
1.8 KiB
C
/*-------------------------------------------------------------------------
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*
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* compat.c
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* Reimplementations of various backend functions.
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*
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* Portions Copyright (c) 2013-2019, PostgreSQL Global Development Group
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*
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* IDENTIFICATION
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* src/bin/pg_waldump/compat.c
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*
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* This file contains client-side implementations for various backend
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* functions that the rm_desc functions in *desc.c files rely on.
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*
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*-------------------------------------------------------------------------
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*/
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/* ugly hack, same as in e.g pg_controldata */
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#define FRONTEND 1
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#include "postgres.h"
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#include <time.h>
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#include "utils/datetime.h"
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/* copied from timestamp.c */
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pg_time_t
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timestamptz_to_time_t(TimestampTz t)
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{
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pg_time_t result;
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result = (pg_time_t) (t / USECS_PER_SEC +
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((POSTGRES_EPOCH_JDATE - UNIX_EPOCH_JDATE) * SECS_PER_DAY));
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return result;
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}
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/*
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* Stopgap implementation of timestamptz_to_str that doesn't depend on backend
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* infrastructure. This will work for timestamps that are within the range
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* of the platform time_t type. (pg_time_t is compatible except for possibly
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* being wider.)
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*
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* XXX the return value points to a static buffer, so beware of using more
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* than one result value concurrently.
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*
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* XXX: The backend timestamp infrastructure should instead be split out and
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* moved into src/common. That's a large project though.
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*/
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const char *
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timestamptz_to_str(TimestampTz dt)
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{
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static char buf[MAXDATELEN + 1];
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char ts[MAXDATELEN + 1];
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char zone[MAXDATELEN + 1];
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time_t result = (time_t) timestamptz_to_time_t(dt);
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struct tm *ltime = localtime(&result);
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strftime(ts, sizeof(ts), "%Y-%m-%d %H:%M:%S", ltime);
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strftime(zone, sizeof(zone), "%Z", ltime);
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snprintf(buf, sizeof(buf), "%s.%06d %s",
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ts, (int) (dt % USECS_PER_SEC), zone);
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return buf;
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}
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