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

 *

 * tableam_indexscan.c

 *    Helpers for table AM index scan callbacks.

 *

 *

 * Table AMs can use these functions to implement xs_getnext_slot callbacks.

 * See access/tableam.h.

 *

 * Portions Copyright (c) 1996-2026, PostgreSQL Global Development Group

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

 *

 *

 * IDENTIFICATION

 *    src/backend/access/table/tableam_indexscan.c

 *

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

 */

#include "postgres.h"

#include "access/tableam_indexscan.h"

#include "utils/builtins.h"

/*

 * Copy all name columns stored as cstrings back into NAMEDATALEN bytes of

 * xs_name_cstring_buf.

 *

 * Called by tableam_index_fill_ios_slot (kept out of line, since it's needed

 * only by index-only scans of indexes on "name" columns).

 */

pg_attribute_cold void

tableam_index_fill_ios_names(IndexScanDesc scan, TupleTableSlot *slot)

{

  for (int idx = 0; idx < scan->xs_name_cstring_count; idx++)

  {

    int     attnum = scan->xs_name_cstring_attnums[idx];

    Name    name;

    /* skip null Datums */

    if (slot->tts_isnull[attnum])

      continue;

    /* use namestrcpy to zero-pad all trailing bytes */

    name = (Name) (scan->xs_name_cstring_buf + idx * NAMEDATALEN);

    namestrcpy(name, DatumGetCString(slot->tts_values[attnum]));

    slot->tts_values[attnum] = NameGetDatum(name);

  }

}