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/*-------------------------------------------------------------------------
*
* rmgrdesc_utils.c
* Support functions for rmgrdesc routines
*
* Copyright (c) 2023, PostgreSQL Global Development Group
*
*
* IDENTIFICATION
* src/backend/access/rmgrdesc/rmgrdesc_utils.c
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include "access/rmgrdesc_utils.h"
#include "storage/off.h"
/*
* Guidelines for formatting desc functions:
*
* member1_name: member1_value, member2_name: member2_value
*
* If the value is a list, please use:
*
* member3_name: [ member3_list_value1, member3_list_value2 ]
*
* The first item appended to the string should not be prepended by any spaces
* or comma, however all subsequent appends to the string are responsible for
* prepending themselves with a comma followed by a space.
*
* Arrays should have a space between the opening square bracket and first
* element and between the last element and closing brace.
*
* Flags should be in ALL CAPS.
*
* For lists/arrays of items, the number of those items should be listed at
* the beginning with all of the other numbers.
*
* List punctuation should still be included even if there are 0 items.
*
* Composite objects in a list should be surrounded with { }.
*/
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;
}
appendStringInfo(buf, " [");
for (int i = 0; i < count; i++)
{
if (i > 0)
appendStringInfoString(buf, ",");
appendStringInfoString(buf, " ");
elem_desc(buf, (char *) array + elem_size * i, data);
}
appendStringInfoString(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
relid_desc(StringInfo buf, void *relid, void *data)
{
appendStringInfo(buf, "%u", *(Oid *) relid);
}
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