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/* dbmseq.c - Visit all elements in the database. This is the NDBM
interface. */
/* This file is part of GDBM, the GNU data base manager.
Copyright (C) 1990-2025 Free Software Foundation, Inc.
GDBM is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
GDBM is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GDBM. If not, see <http://www.gnu.org/licenses/>. */
/* Include system configuration before all else. */
#include "autoconf.h"
#include "ndbm.h"
#include "gdbmdefs.h"
/* NDBM Start the visit of all keys in the database. This produces
something in hash order, not in any sorted order. DBF is the dbm file
information pointer. */
datum
dbm_firstkey (DBM *dbm)
{
datum ret_val;
/* Free previous dynamic memory, do actual call, and save pointer to new
memory. */
ret_val = gdbm_firstkey (dbm->file);
if (dbm->_dbm_memory.dptr != NULL)
free (dbm->_dbm_memory.dptr);
dbm->_dbm_memory = ret_val;
__gdbm_error_to_ndbm (dbm);
/* Return the new value. */
return ret_val;
}
/* NDBM Continue visiting all keys. The next key in the sequence is returned.
DBF is the file information pointer. */
datum
dbm_nextkey (DBM *dbm)
{
datum ret_val;
/* Make sure we have a valid key. */
if (dbm->_dbm_memory.dptr == NULL)
return dbm->_dbm_memory;
/* Call gdbm nextkey with the old value. After that, free the old value. */
ret_val = gdbm_nextkey (dbm->file, dbm->_dbm_memory);
if (dbm->_dbm_memory.dptr != NULL)
free (dbm->_dbm_memory.dptr);
dbm->_dbm_memory = ret_val;
__gdbm_error_to_ndbm (dbm);
/* Return the new value. */
return ret_val;
}
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