glibc/db2/db/db_iface.c

489 lines
10 KiB
C
Raw Normal View History

/*-
* See the file LICENSE for redistribution information.
*
* Copyright (c) 1996, 1997, 1998
* Sleepycat Software. All rights reserved.
*/
#include "config.h"
#ifndef lint
static const char sccsid[] = "@(#)db_iface.c 10.40 (Sleepycat) 12/19/98";
#endif /* not lint */
#ifndef NO_SYSTEM_INCLUDES
#include <sys/types.h>
#include <errno.h>
#endif
#include "db_int.h"
#include "db_page.h"
#include "db_auto.h"
#include "db_ext.h"
#include "common_ext.h"
static int __db_keyempty __P((const DB_ENV *));
static int __db_rdonly __P((const DB_ENV *, const char *));
static int __dbt_ferr __P((const DB *, const char *, const DBT *, int));
/*
* __db_cdelchk --
* Common cursor delete argument checking routine.
*
* PUBLIC: int __db_cdelchk __P((const DB *, u_int32_t, int, int));
*/
int
__db_cdelchk(dbp, flags, isrdonly, isvalid)
const DB *dbp;
u_int32_t flags;
int isrdonly, isvalid;
{
/* Check for changes to a read-only tree. */
if (isrdonly)
return (__db_rdonly(dbp->dbenv, "c_del"));
/* Check for invalid function flags. */
switch (flags) {
case 0:
break;
default:
return (__db_ferr(dbp->dbenv, "DBcursor->c_del", 0));
}
/*
* The cursor must be initialized, return -1 for an invalid cursor,
* otherwise 0.
*/
return (isvalid ? 0 : EINVAL);
}
/*
* __db_cgetchk --
* Common cursor get argument checking routine.
*
* PUBLIC: int __db_cgetchk __P((const DB *, DBT *, DBT *, u_int32_t, int));
*/
int
__db_cgetchk(dbp, key, data, flags, isvalid)
const DB *dbp;
DBT *key, *data;
u_int32_t flags;
int isvalid;
{
int key_einval, key_flags, ret;
key_einval = key_flags = 0;
/* Check for invalid function flags. */
LF_CLR(DB_RMW);
switch (flags) {
case DB_NEXT_DUP:
if (dbp->type == DB_RECNO)
goto err;
/* FALLTHROUGH */
case DB_CURRENT:
case DB_FIRST:
case DB_LAST:
case DB_NEXT:
case DB_PREV:
key_flags = 1;
break;
case DB_GET_BOTH:
case DB_SET_RANGE:
key_einval = key_flags = 1;
break;
case DB_SET:
key_einval = 1;
break;
case DB_GET_RECNO:
if (!F_ISSET(dbp, DB_BT_RECNUM))
goto err;
break;
case DB_SET_RECNO:
if (!F_ISSET(dbp, DB_BT_RECNUM))
goto err;
key_einval = key_flags = 1;
break;
default:
err: return (__db_ferr(dbp->dbenv, "DBcursor->c_get", 0));
}
/* Check for invalid key/data flags. */
if ((ret = __dbt_ferr(dbp, "key", key, 0)) != 0)
return (ret);
if ((ret = __dbt_ferr(dbp, "data", data, 0)) != 0)
return (ret);
/* Check for missing keys. */
if (key_einval && (key->data == NULL || key->size == 0))
return (__db_keyempty(dbp->dbenv));
/*
* The cursor must be initialized for DB_CURRENT, return -1 for an
* invalid cursor, otherwise 0.
*/
return (isvalid || flags != DB_CURRENT ? 0 : EINVAL);
}
/*
* __db_cputchk --
* Common cursor put argument checking routine.
*
* PUBLIC: int __db_cputchk __P((const DB *,
* PUBLIC: const DBT *, DBT *, u_int32_t, int, int));
*/
int
__db_cputchk(dbp, key, data, flags, isrdonly, isvalid)
const DB *dbp;
const DBT *key;
DBT *data;
u_int32_t flags;
int isrdonly, isvalid;
{
int key_einval, key_flags, ret;
key_einval = key_flags = 0;
/* Check for changes to a read-only tree. */
if (isrdonly)
return (__db_rdonly(dbp->dbenv, "c_put"));
/* Check for invalid function flags. */
switch (flags) {
case DB_AFTER:
case DB_BEFORE:
if (dbp->dup_compare != NULL)
goto err;
if (dbp->type == DB_RECNO && !F_ISSET(dbp, DB_RE_RENUMBER))
goto err;
if (dbp->type != DB_RECNO && !F_ISSET(dbp, DB_AM_DUP))
goto err;
break;
case DB_CURRENT:
/*
* If there is a comparison function, doing a DB_CURRENT
* must not change the part of the data item that is used
* for the comparison.
*/
break;
case DB_KEYFIRST:
case DB_KEYLAST:
if (dbp->type == DB_RECNO)
goto err;
key_einval = key_flags = 1;
break;
default:
err: return (__db_ferr(dbp->dbenv, "DBcursor->c_put", 0));
}
/* Check for invalid key/data flags. */
if (key_flags && (ret = __dbt_ferr(dbp, "key", key, 0)) != 0)
return (ret);
if ((ret = __dbt_ferr(dbp, "data", data, 0)) != 0)
return (ret);
/* Check for missing keys. */
if (key_einval && (key->data == NULL || key->size == 0))
return (__db_keyempty(dbp->dbenv));
/*
* The cursor must be initialized for anything other than DB_KEYFIRST
* and DB_KEYLAST, return -1 for an invalid cursor, otherwise 0.
*/
return (isvalid ||
flags == DB_KEYFIRST || flags == DB_KEYLAST ? 0 : EINVAL);
}
/*
* __db_closechk --
* DB->close flag check.
*
* PUBLIC: int __db_closechk __P((const DB *, u_int32_t));
*/
int
__db_closechk(dbp, flags)
const DB *dbp;
u_int32_t flags;
{
/* Check for invalid function flags. */
if (flags != 0 && flags != DB_NOSYNC)
return (__db_ferr(dbp->dbenv, "DB->close", 0));
return (0);
}
/*
* __db_delchk --
* Common delete argument checking routine.
*
* PUBLIC: int __db_delchk __P((const DB *, DBT *, u_int32_t, int));
*/
int
__db_delchk(dbp, key, flags, isrdonly)
const DB *dbp;
DBT *key;
u_int32_t flags;
int isrdonly;
{
/* Check for changes to a read-only tree. */
if (isrdonly)
return (__db_rdonly(dbp->dbenv, "delete"));
/* Check for invalid function flags. */
switch (flags) {
case 0:
break;
default:
return (__db_ferr(dbp->dbenv, "DB->del", 0));
}
/* Check for missing keys. */
if (key->data == NULL || key->size == 0)
return (__db_keyempty(dbp->dbenv));
return (0);
}
/*
* __db_getchk --
* Common get argument checking routine.
*
* PUBLIC: int __db_getchk __P((const DB *, const DBT *, DBT *, u_int32_t));
*/
int
__db_getchk(dbp, key, data, flags)
const DB *dbp;
const DBT *key;
DBT *data;
u_int32_t flags;
{
int ret;
/* Check for invalid function flags. */
LF_CLR(DB_RMW);
switch (flags) {
case 0:
case DB_GET_BOTH:
break;
case DB_SET_RECNO:
if (!F_ISSET(dbp, DB_BT_RECNUM))
goto err;
break;
default:
err: return (__db_ferr(dbp->dbenv, "DB->get", 0));
}
/* Check for invalid key/data flags. */
if ((ret = __dbt_ferr(dbp, "key", key, flags == DB_SET_RECNO)) != 0)
return (ret);
if ((ret = __dbt_ferr(dbp, "data", data, 1)) != 0)
return (ret);
/* Check for missing keys. */
if (key->data == NULL || key->size == 0)
return (__db_keyempty(dbp->dbenv));
return (0);
}
/*
* __db_joinchk --
* Common join argument checking routine.
*
* PUBLIC: int __db_joinchk __P((const DB *, u_int32_t));
*/
int
__db_joinchk(dbp, flags)
const DB *dbp;
u_int32_t flags;
{
if (flags != 0)
return (__db_ferr(dbp->dbenv, "DB->join", 0));
return (0);
}
/*
* __db_putchk --
* Common put argument checking routine.
*
* PUBLIC: int __db_putchk
* PUBLIC: __P((const DB *, DBT *, const DBT *, u_int32_t, int, int));
*/
int
__db_putchk(dbp, key, data, flags, isrdonly, isdup)
const DB *dbp;
DBT *key;
const DBT *data;
u_int32_t flags;
int isrdonly, isdup;
{
int ret;
/* Check for changes to a read-only tree. */
if (isrdonly)
return (__db_rdonly(dbp->dbenv, "put"));
/* Check for invalid function flags. */
switch (flags) {
case 0:
case DB_NOOVERWRITE:
break;
case DB_APPEND:
if (dbp->type != DB_RECNO)
goto err;
break;
default:
err: return (__db_ferr(dbp->dbenv, "DB->put", 0));
}
/* Check for invalid key/data flags. */
if ((ret = __dbt_ferr(dbp, "key", key, 0)) != 0)
return (ret);
if ((ret = __dbt_ferr(dbp, "data", data, 0)) != 0)
return (ret);
/* Check for missing keys. */
if (key->data == NULL || key->size == 0)
return (__db_keyempty(dbp->dbenv));
/* Check for partial puts in the presence of duplicates. */
if (isdup && F_ISSET(data, DB_DBT_PARTIAL)) {
__db_err(dbp->dbenv,
"a partial put in the presence of duplicates requires a cursor operation");
return (EINVAL);
}
return (0);
}
/*
* __db_statchk --
* Common stat argument checking routine.
*
* PUBLIC: int __db_statchk __P((const DB *, u_int32_t));
*/
int
__db_statchk(dbp, flags)
const DB *dbp;
u_int32_t flags;
{
/* Check for invalid function flags. */
switch (flags) {
case 0:
break;
case DB_RECORDCOUNT:
if (dbp->type == DB_RECNO)
break;
if (dbp->type == DB_BTREE && F_ISSET(dbp, DB_BT_RECNUM))
break;
goto err;
default:
err: return (__db_ferr(dbp->dbenv, "DB->stat", 0));
}
return (0);
}
/*
* __db_syncchk --
* Common sync argument checking routine.
*
* PUBLIC: int __db_syncchk __P((const DB *, u_int32_t));
*/
int
__db_syncchk(dbp, flags)
const DB *dbp;
u_int32_t flags;
{
/* Check for invalid function flags. */
switch (flags) {
case 0:
break;
default:
return (__db_ferr(dbp->dbenv, "DB->sync", 0));
}
return (0);
}
/*
* __dbt_ferr --
* Check a DBT for flag errors.
*/
static int
__dbt_ferr(dbp, name, dbt, check_thread)
const DB *dbp;
const char *name;
const DBT *dbt;
int check_thread;
{
int ret;
/*
* Check for invalid DBT flags. We allow any of the flags to be
* specified to any DB or DBcursor call so that applications can
* set DB_DBT_MALLOC when retrieving a data item from a secondary
* database and then specify that same DBT as a key to a primary
* database, without having to clear flags.
*/
if ((ret = __db_fchk(dbp->dbenv, name, dbt->flags,
DB_DBT_MALLOC | DB_DBT_USERMEM | DB_DBT_PARTIAL)) != 0)
return (ret);
if ((ret = __db_fcchk(dbp->dbenv, name,
dbt->flags, DB_DBT_MALLOC, DB_DBT_USERMEM)) != 0)
return (ret);
if (check_thread && F_ISSET(dbp, DB_AM_THREAD) &&
!F_ISSET(dbt, DB_DBT_MALLOC | DB_DBT_USERMEM)) {
__db_err(dbp->dbenv,
"missing flag thread flag for %s DBT", name);
return (EINVAL);
}
return (0);
}
/*
* __db_eopnotsup --
* Common operation not supported message.
*
* PUBLIC: int __db_eopnotsup __P((const DB_ENV *));
*/
int
__db_eopnotsup(dbenv)
const DB_ENV *dbenv;
{
__db_err(dbenv, "operation not supported");
#ifdef EOPNOTSUPP
return (EOPNOTSUPP);
#else
return (EINVAL);
#endif
}
/*
* __db_keyempty --
* Common missing or empty key value message.
*/
static int
__db_keyempty(dbenv)
const DB_ENV *dbenv;
{
__db_err(dbenv, "missing or empty key value specified");
return (EINVAL);
}
/*
* __db_rdonly --
* Common readonly message.
*/
static int
__db_rdonly(dbenv, name)
const DB_ENV *dbenv;
const char *name;
{
__db_err(dbenv, "%s: attempt to modify a read-only tree", name);
return (EACCES);
}