1 /*-------------------------------------------------------------------------
2 *
3 * compat.c
4 * Reimplementations of various backend functions.
5 *
6 * Portions Copyright (c) 2013-2018, 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 */
27 pg_time_t
timestamptz_to_time_t(TimestampTz t)28 timestamptz_to_time_t(TimestampTz t)
29 {
30 pg_time_t result;
31
32 result = (pg_time_t) (t / USECS_PER_SEC +
33 ((POSTGRES_EPOCH_JDATE - UNIX_EPOCH_JDATE) * SECS_PER_DAY));
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 *
timestamptz_to_str(TimestampTz dt)50 timestamptz_to_str(TimestampTz dt)
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 snprintf(buf, sizeof(buf), "%s.%06d %s",
62 ts, (int) (dt % USECS_PER_SEC), zone);
63
64 return buf;
65 }
66
67 /*
68 * Provide a hacked up compat layer for StringInfos so xlog desc functions can
69 * be linked/called.
70 */
71 void
appendStringInfo(StringInfo str,const char * fmt,...)72 appendStringInfo(StringInfo str, const char *fmt,...)
73 {
74 va_list args;
75
76 va_start(args, fmt);
77 vprintf(fmt, args);
78 va_end(args);
79 }
80
81 void
appendStringInfoString(StringInfo str,const char * string)82 appendStringInfoString(StringInfo str, const char *string)
83 {
84 appendStringInfo(str, "%s", string);
85 }
86
87 void
appendStringInfoChar(StringInfo str,char ch)88 appendStringInfoChar(StringInfo str, char ch)
89 {
90 appendStringInfo(str, "%c", ch);
91 }
92