PostgreSQL Source Code  git master
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros
compat.c
Go to the documentation of this file.
1 /*-------------------------------------------------------------------------
2  *
3  * compat.c
4  * Reimplementations of various backend functions.
5  *
6  * Portions Copyright (c) 2013-2017, 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 #include "lib/stringinfo.h"
25 
26 /* copied from timestamp.c */
29 {
31 
32  result = (pg_time_t) (t / USECS_PER_SEC +
34  return result;
35 }
36 
37 /*
38  * Stopgap implementation of timestamptz_to_str that doesn't depend on backend
39  * infrastructure. This will work for timestamps that are within the range
40  * of the platform time_t type. (pg_time_t is compatible except for possibly
41  * being wider.)
42  *
43  * XXX the return value points to a static buffer, so beware of using more
44  * than one result value concurrently.
45  *
46  * XXX: The backend timestamp infrastructure should instead be split out and
47  * moved into src/common. That's a large project though.
48  */
49 const char *
51 {
52  static char buf[MAXDATELEN + 1];
53  char ts[MAXDATELEN + 1];
54  char zone[MAXDATELEN + 1];
55  time_t result = (time_t) timestamptz_to_time_t(dt);
56  struct tm *ltime = localtime(&result);
57 
58  strftime(ts, sizeof(ts), "%Y-%m-%d %H:%M:%S", ltime);
59  strftime(zone, sizeof(zone), "%Z", ltime);
60 
61  sprintf(buf, "%s.%06d %s", ts, (int) (dt % USECS_PER_SEC), zone);
62 
63  return buf;
64 }
65 
66 /*
67  * Provide a hacked up compat layer for StringInfos so xlog desc functions can
68  * be linked/called.
69  */
70 void
71 appendStringInfo(StringInfo str, const char *fmt,...)
72 {
73  va_list args;
74 
75  va_start(args, fmt);
76  vprintf(fmt, args);
77  va_end(args);
78 }
79 
80 void
81 appendStringInfoString(StringInfo str, const char *string)
82 {
83  appendStringInfo(str, "%s", string);
84 }
85 
86 void
88 {
89  appendStringInfo(str, "%c", ch);
90 }
#define MAXDATELEN
Definition: datetime.h:203
int64 pg_time_t
Definition: pgtime.h:23
#define USECS_PER_SEC
Definition: timestamp.h:94
int64 TimestampTz
Definition: timestamp.h:39
return result
Definition: formatting.c:1618
static struct pg_tm tm
Definition: localtime.c:103
#define SECS_PER_DAY
Definition: timestamp.h:86
static char * buf
Definition: pg_test_fsync.c:65
const char * timestamptz_to_str(TimestampTz dt)
Definition: compat.c:50
Definition: zic.c:90
pg_time_t timestamptz_to_time_t(TimestampTz t)
Definition: compat.c:28
void appendStringInfo(StringInfo str, const char *fmt,...)
Definition: compat.c:71
#define UNIX_EPOCH_JDATE
Definition: timestamp.h:162
#define POSTGRES_EPOCH_JDATE
Definition: timestamp.h:163
void appendStringInfoString(StringInfo str, const char *string)
Definition: compat.c:81
void appendStringInfoChar(StringInfo str, char ch)
Definition: compat.c:87