genericdesc.c

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/*-------------------------------------------------------------------------
 *
 * genericdesc.c
 *    rmgr descriptor routines for access/transam/generic_xlog.c
 *
 *
 * Portions Copyright (c) 1996-2025, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 * src/backend/access/rmgrdesc/genericdesc.c
 *
 *-------------------------------------------------------------------------
 */
#include "postgres.h"
 
#include "access/generic_xlog.h"
#include "lib/stringinfo.h"
 
/*
 * Description of generic xlog record: write page regions that this record
 * overrides.
 */
void
generic_desc(StringInfo buf, XLogReaderState *record)
{
    Pointer     ptr = XLogRecGetData(record),
                end = ptr + XLogRecGetDataLen(record);
 
    while (ptr < end)
    {
        OffsetNumber offset,
                    length;
 
        memcpy(&offset, ptr, sizeof(offset));
        ptr += sizeof(offset);
        memcpy(&length, ptr, sizeof(length));
        ptr += sizeof(length);
        ptr += length;
 
        if (ptr < end)
            appendStringInfo(buf, "offset %u, length %u; ", offset, length);
        else
            appendStringInfo(buf, "offset %u, length %u", offset, length);
    }
}
 
/*
 * Identification of generic xlog record: we don't distinguish any subtypes
 * inside generic xlog records.
 */
const char *
generic_identify(uint8 info)
{
    return "Generic";
}