qam_upgrade.c
上传用户:romrleung
上传日期:2022-05-23
资源大小:18897k
文件大小:2k
- /*-
- * See the file LICENSE for redistribution information.
- *
- * Copyright (c) 1996-2002
- * Sleepycat Software. All rights reserved.
- */
- #include "db_config.h"
- #ifndef lint
- static const char revid[] = "$Id: qam_upgrade.c,v 11.12 2002/03/29 20:46:48 bostic Exp $";
- #endif /* not lint */
- #ifndef NO_SYSTEM_INCLUDES
- #include <sys/types.h>
- #include <limits.h>
- #include <string.h>
- #endif
- #include "db_int.h"
- #include "dbinc/db_upgrade.h"
- /*
- * __qam_31_qammeta --
- * Upgrade the database from version 1 to version 2.
- *
- * PUBLIC: int __qam_31_qammeta __P((DB *, char *, u_int8_t *));
- */
- int
- __qam_31_qammeta(dbp, real_name, buf)
- DB *dbp;
- char *real_name;
- u_int8_t *buf;
- {
- QMETA31 *newmeta;
- QMETA30 *oldmeta;
- COMPQUIET(dbp, NULL);
- COMPQUIET(real_name, NULL);
- newmeta = (QMETA31 *)buf;
- oldmeta = (QMETA30 *)buf;
- /*
- * Copy the fields to their new locations.
- * They may overlap so start at the bottom and use memmove().
- */
- newmeta->rec_page = oldmeta->rec_page;
- newmeta->re_pad = oldmeta->re_pad;
- newmeta->re_len = oldmeta->re_len;
- newmeta->cur_recno = oldmeta->cur_recno;
- newmeta->first_recno = oldmeta->first_recno;
- newmeta->start = oldmeta->start;
- memmove(newmeta->dbmeta.uid,
- oldmeta->dbmeta.uid, sizeof(oldmeta->dbmeta.uid));
- newmeta->dbmeta.flags = oldmeta->dbmeta.flags;
- newmeta->dbmeta.record_count = 0;
- newmeta->dbmeta.key_count = 0;
- ZERO_LSN(newmeta->dbmeta.unused3);
- /* Update the version. */
- newmeta->dbmeta.version = 2;
- return (0);
- }
- /*
- * __qam_32_qammeta --
- * Upgrade the database from version 2 to version 3.
- *
- * PUBLIC: int __qam_32_qammeta __P((DB *, char *, u_int8_t *));
- */
- int
- __qam_32_qammeta(dbp, real_name, buf)
- DB *dbp;
- char *real_name;
- u_int8_t *buf;
- {
- QMETA32 *newmeta;
- QMETA31 *oldmeta;
- COMPQUIET(dbp, NULL);
- COMPQUIET(real_name, NULL);
- newmeta = (QMETA32 *)buf;
- oldmeta = (QMETA31 *)buf;
- /*
- * Copy the fields to their new locations.
- * We are dropping the first field so move
- * from the top.
- */
- newmeta->first_recno = oldmeta->first_recno;
- newmeta->cur_recno = oldmeta->cur_recno;
- newmeta->re_len = oldmeta->re_len;
- newmeta->re_pad = oldmeta->re_pad;
- newmeta->rec_page = oldmeta->rec_page;
- newmeta->page_ext = 0;
- /* cur_recno now points to the first free slot. */
- newmeta->cur_recno++;
- if (newmeta->first_recno == 0)
- newmeta->first_recno = 1;
- /* Update the version. */
- newmeta->dbmeta.version = 3;
- return (0);
- }