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/* seq.c - This is the sequential visit of the database. This defines two
user-visable routines that are used together. This is the DBM interface. */
/* This file is part of GDBM, the GNU data base manager, by Philip A. Nelson.
Copyright (C) 1990, 1991, 1993 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 2, 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; see the file COPYING. If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
You may contact the author by:
e-mail: phil@cs.wwu.edu
us-mail: Philip A. Nelson
Computer Science Department
Western Washington University
Bellingham, WA 98226
*************************************************************************/
/* include system configuration before all else. */
#include "autoconf.h"
#include "gdbmdefs.h"
#include "extern.h"
/* Start the visit of all keys in the database. This produces something in
hash order, not in any sorted order. */
datum
firstkey ()
{
datum ret_val;
/* Free previous dynamic memory, do actual call, and save pointer to new
memory. */
ret_val = gdbm_firstkey (_gdbm_file);
if (_gdbm_memory.dptr != NULL) free (_gdbm_memory.dptr);
_gdbm_memory = ret_val;
/* Return the new value. */
return ret_val;
}
/* Continue visiting all keys. The next key following KEY is returned. */
datum
nextkey (key)
datum key;
{
datum ret_val;
/* Make sure we have a valid key. */
if (key.dptr == NULL)
return key;
/* Call gdbm nextkey with supplied value. After that, free the old value. */
ret_val = gdbm_nextkey (_gdbm_file, key);
if (_gdbm_memory.dptr != NULL) free (_gdbm_memory.dptr);
_gdbm_memory = ret_val;
/* Return the new value. */
return ret_val;
}
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