| 1 | /* dbmseq.c - Visit all elements in the database. This is the NDBM
|
|---|
| 2 | interface. */
|
|---|
| 3 |
|
|---|
| 4 | /* This file is part of GDBM, the GNU data base manager, by Philip A. Nelson.
|
|---|
| 5 | Copyright (C) 1990, 1991, 1993 Free Software Foundation, Inc.
|
|---|
| 6 |
|
|---|
| 7 | GDBM is free software; you can redistribute it and/or modify
|
|---|
| 8 | it under the terms of the GNU General Public License as published by
|
|---|
| 9 | the Free Software Foundation; either version 2, or (at your option)
|
|---|
| 10 | any later version.
|
|---|
| 11 |
|
|---|
| 12 | GDBM is distributed in the hope that it will be useful,
|
|---|
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|---|
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|---|
| 15 | GNU General Public License for more details.
|
|---|
| 16 |
|
|---|
| 17 | You should have received a copy of the GNU General Public License
|
|---|
| 18 | along with GDBM; see the file COPYING. If not, write to
|
|---|
| 19 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
|
|---|
| 20 |
|
|---|
| 21 | You may contact the author by:
|
|---|
| 22 | e-mail: [email protected]
|
|---|
| 23 | us-mail: Philip A. Nelson
|
|---|
| 24 | Computer Science Department
|
|---|
| 25 | Western Washington University
|
|---|
| 26 | Bellingham, WA 98226
|
|---|
| 27 |
|
|---|
| 28 | *************************************************************************/
|
|---|
| 29 |
|
|---|
| 30 |
|
|---|
| 31 | /* include system configuration before all else. */
|
|---|
| 32 | #include "autoconf.h"
|
|---|
| 33 |
|
|---|
| 34 | #include "gdbmdefs.h"
|
|---|
| 35 | #include "extern.h"
|
|---|
| 36 |
|
|---|
| 37 |
|
|---|
| 38 | /* NDBM Start the visit of all keys in the database. This produces
|
|---|
| 39 | something in hash order, not in any sorted order. DBF is the dbm file
|
|---|
| 40 | information pointer. */
|
|---|
| 41 |
|
|---|
| 42 | datum
|
|---|
| 43 | dbm_firstkey (dbf)
|
|---|
| 44 | gdbm_file_info *dbf;
|
|---|
| 45 | {
|
|---|
| 46 | datum ret_val;
|
|---|
| 47 |
|
|---|
| 48 | /* Free previous dynamic memory, do actual call, and save pointer to new
|
|---|
| 49 | memory. */
|
|---|
| 50 | ret_val = gdbm_firstkey (dbf);
|
|---|
| 51 | if (_gdbm_memory.dptr != NULL) free (_gdbm_memory.dptr);
|
|---|
| 52 | _gdbm_memory = ret_val;
|
|---|
| 53 |
|
|---|
| 54 | /* Return the new value. */
|
|---|
| 55 | return ret_val;
|
|---|
| 56 | }
|
|---|
| 57 |
|
|---|
| 58 |
|
|---|
| 59 | /* NDBM Continue visiting all keys. The next key in the sequence is returned.
|
|---|
| 60 | DBF is the file information pointer. */
|
|---|
| 61 |
|
|---|
| 62 | datum
|
|---|
| 63 | dbm_nextkey (dbf)
|
|---|
| 64 | gdbm_file_info *dbf;
|
|---|
| 65 | {
|
|---|
| 66 | datum ret_val;
|
|---|
| 67 |
|
|---|
| 68 | /* Make sure we have a valid key. */
|
|---|
| 69 | if (_gdbm_memory.dptr == NULL)
|
|---|
| 70 | return _gdbm_memory;
|
|---|
| 71 |
|
|---|
| 72 | /* Call gdbm nextkey with the old value. After that, free the old value. */
|
|---|
| 73 | ret_val = gdbm_nextkey (dbf,_gdbm_memory);
|
|---|
| 74 | if (_gdbm_memory.dptr != NULL) free (_gdbm_memory.dptr);
|
|---|
| 75 | _gdbm_memory = ret_val;
|
|---|
| 76 |
|
|---|
| 77 | /* Return the new value. */
|
|---|
| 78 | return ret_val;
|
|---|
| 79 | }
|
|---|
| 80 |
|
|---|
