PostgreSQL Source Code: src/bin/pg_waldump/compat.c Source File

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compat.c
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1/*-------------------------------------------------------------------------
2 *
3 * compat.c
4 * Reimplementations of various backend functions.
5 *
6 * Portions Copyright (c) 2013-2025, PostgreSQL Global Development Group
7 *
8 * IDENTIFICATION
9 * src/bin/pg_waldump/compat.c
10 *
11 * This file contains client-side implementations for various backend
12 * functions that the rm_desc functions in *desc.c files rely on.
13 *
14 *-------------------------------------------------------------------------
15 */
16
17/* ugly hack, same as in e.g pg_controldata */
18 #define FRONTEND 1
19#include "postgres.h"
20
21#include <time.h>
22
23#include "utils/datetime.h"
24
25/* copied from timestamp.c */
26pg_time_t
27 timestamptz_to_time_t(TimestampTz t)
28{
29 pg_time_t result;
30
31 result = (pg_time_t) (t / USECS_PER_SEC +
32 ((POSTGRES_EPOCH_JDATE - UNIX_EPOCH_JDATE) * SECS_PER_DAY));
33 return result;
34}
35
36/*
37 * Stopgap implementation of timestamptz_to_str that doesn't depend on backend
38 * infrastructure. This will work for timestamps that are within the range
39 * of the platform time_t type. (pg_time_t is compatible except for possibly
40 * being wider.)
41 *
42 * XXX the return value points to a static buffer, so beware of using more
43 * than one result value concurrently.
44 *
45 * XXX: The backend timestamp infrastructure should instead be split out and
46 * moved into src/common. That's a large project though.
47 */
48const char *
49 timestamptz_to_str(TimestampTz t)
50{
51 static char buf[MAXDATELEN + 1];
52 char ts[MAXDATELEN + 1];
53 char zone[MAXDATELEN + 1];
54 time_t result = (time_t) timestamptz_to_time_t(t);
55 struct tm *ltime = localtime(&result);
56
57 strftime(ts, sizeof(ts), "%Y-%m-%d %H:%M:%S", ltime);
58 strftime(zone, sizeof(zone), "%Z", ltime);
59
60 snprintf(buf, sizeof(buf), "%s.%06d %s",
61 ts, (int) (t % USECS_PER_SEC), zone);
62
63 return buf;
64}
const char * timestamptz_to_str(TimestampTz t)
Definition: compat.c:49
pg_time_t timestamptz_to_time_t(TimestampTz t)
Definition: compat.c:27
int64 TimestampTz
Definition: timestamp.h:39
#define USECS_PER_SEC
Definition: timestamp.h:134
#define UNIX_EPOCH_JDATE
Definition: timestamp.h:234
#define SECS_PER_DAY
Definition: timestamp.h:126
#define POSTGRES_EPOCH_JDATE
Definition: timestamp.h:235
#define MAXDATELEN
Definition: datetime.h:200
static struct pg_tm tm
Definition: localtime.c:104
static char * buf
Definition: pg_test_fsync.c:72
int64 pg_time_t
Definition: pgtime.h:23
#define snprintf
Definition: port.h:239
Definition: zic.c:94

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