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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-04 12:15:05 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-04 12:15:05 +0000
commit46651ce6fe013220ed397add242004d764fc0153 (patch)
tree6e5299f990f88e60174a1d3ae6e48eedd2688b2b /src/bin/pg_waldump/compat.c
parentInitial commit. (diff)
downloadpostgresql-14-upstream.tar.xz
postgresql-14-upstream.zip
Adding upstream version 14.5.upstream/14.5upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/bin/pg_waldump/compat.c')
-rw-r--r--src/bin/pg_waldump/compat.c64
1 files changed, 64 insertions, 0 deletions
diff --git a/src/bin/pg_waldump/compat.c b/src/bin/pg_waldump/compat.c
new file mode 100644
index 0000000..08bd627
--- /dev/null
+++ b/src/bin/pg_waldump/compat.c
@@ -0,0 +1,64 @@
+/*-------------------------------------------------------------------------
+ *
+ * compat.c
+ * Reimplementations of various backend functions.
+ *
+ * Portions Copyright (c) 2013-2021, 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;
+}