/*-------------------------------------------------------------------------

 *

 * clogdesc.c

 *    rmgr descriptor routines for access/transam/clog.c

 *

 * Portions Copyright (c) 1996-2025, PostgreSQL Global Development Group

 * Portions Copyright (c) 1994, Regents of the University of California

 *

 *

 * IDENTIFICATION

 *    src/backend/access/rmgrdesc/clogdesc.c

 *

 *-------------------------------------------------------------------------

 */

#include "postgres.h"

#include "access/clog.h"

void

clog_desc(StringInfo buf, XLogReaderState *record)

{

  char     *rec = XLogRecGetData(record);

  uint8   info = XLogRecGetInfo(record) & ~XLR_INFO_MASK;

  if (info == CLOG_ZEROPAGE)

  {

    int64   pageno;

    memcpy(&pageno, rec, sizeof(pageno));

    appendStringInfo(buf, "page %" PRId64, pageno);

  }

  else if (info == CLOG_TRUNCATE)

  {

    xl_clog_truncate xlrec;

    memcpy(&xlrec, rec, sizeof(xl_clog_truncate));

    appendStringInfo(buf, "page %" PRId64 "; oldestXact %u",

             xlrec.pageno, xlrec.oldestXact);

  }

}

const char *

clog_identify(uint8 info)

{

  const char *id = NULL;

  switch (info & ~XLR_INFO_MASK)

  {

    case CLOG_ZEROPAGE:

      id = "ZEROPAGE";

      break;

    case CLOG_TRUNCATE:

      id = "TRUNCATE";

      break;

  }

  return id;

}