rmgrdesc_utils.c

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/*-------------------------------------------------------------------------
 *
 * rmgrdesc_utils.c
 *    Support functions for rmgrdesc routines
 *
 * Copyright (c) 2023-2024, PostgreSQL Global Development Group
 *
 *
 * IDENTIFICATION
 *    src/backend/access/rmgrdesc/rmgrdesc_utils.c
 *
 *-------------------------------------------------------------------------
 */
#include "postgres.h"
 
#include "access/rmgrdesc_utils.h"
#include "storage/off.h"
 
/*
 * Helper function to print an array, in the format described in the
 * README.
 */
void
array_desc(StringInfo buf, void *array, size_t elem_size, int count,
           void (*elem_desc) (StringInfo buf, void *elem, void *data),
           void *data)
{
    if (count == 0)
    {
        appendStringInfoString(buf, " []");
        return;
    }
    appendStringInfoString(buf, " [");
    for (int i = 0; i < count; i++)
    {
        elem_desc(buf, (char *) array + elem_size * i, data);
        if (i < count - 1)
            appendStringInfoString(buf, ", ");
    }
    appendStringInfoChar(buf, ']');
}
 
void
offset_elem_desc(StringInfo buf, void *offset, void *data)
{
    appendStringInfo(buf, "%u", *(OffsetNumber *) offset);
}
 
void
redirect_elem_desc(StringInfo buf, void *offset, void *data)
{
    OffsetNumber *new_offset = (OffsetNumber *) offset;
 
    appendStringInfo(buf, "%u->%u", new_offset[0], new_offset[1]);
}
 
void
oid_elem_desc(StringInfo buf, void *relid, void *data)
{
    appendStringInfo(buf, "%u", *(Oid *) relid);
}