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/*!
* \file db/dbmi_driver/driver_state.c
*
* \brief DBMI Library (driver) - drivers state
*
* (C) 1999-2008 by the GRASS Development Team
*
* This program is free software under the GNU General Public
* License (>=v2). Read the file COPYING that comes with GRASS
* for details.
*
* \author Joel Jones (CERL/UIUC), Radim Blazek
*/
#include <stdlib.h>
#include <grass/dbmi.h>
#include "dbstubs.h"
static dbDriverState state;
/*!
\brief Initialize driver state
*/
void db__init_driver_state(void)
{
db_zero((void *)&state, sizeof(state));
}
/*!
\brief Get driver state
\return pointer to dbDriverState
*/
dbDriverState *db__get_driver_state(void)
{
return &state;
}
/*!
\brief Test database connection
\return 1 opened
\return 0 closed
*/
int db__test_database_open(void)
{
return state.open ? 1 : 0;
}
/*!
\brief Mark database as opened
\param dbname database name
\param dbschema database schema name
*/
void db__mark_database_open(const char *dbname, const char *dbschema)
{
state.dbname = db_store(dbname);
state.dbschema = db_store(dbschema);
state.open = 1;
}
/*!
\brief Mark database as closed
*/
void db__mark_database_closed(void)
{
db_free(state.dbname);
db_free(state.dbschema);
state.open = 0;
}
/*!
\brief Add cursor do driver state
\param cursor db cursor to be added
*/
void db__add_cursor_to_driver_state(dbCursor *cursor)
{
dbCursor **list;
int i;
/* find an empty slot in the cursor list */
list = state.cursor_list;
for (i = 0; i < state.ncursors; i++)
if (list[i] == NULL)
break;
/* if not found, extend list */
if (i >= state.ncursors) {
list =
(dbCursor **)db_realloc((void *)list, (i + 1) * sizeof(dbCursor *));
if (list == NULL)
return;
state.cursor_list = list;
state.ncursors = i + 1;
}
/* add it in */
list[i] = cursor;
}
/*!
\brief Drop cursor from driver state
\param cursor db cursor to be dropped
*/
void db__drop_cursor_from_driver_state(dbCursor *cursor)
{
int i;
for (i = 0; i < state.ncursors; i++)
if (state.cursor_list[i] == cursor)
state.cursor_list[i] = NULL;
}
/*!
\brief Close all cursors
*/
void db__close_all_cursors(void)
{
int i;
for (i = 0; i < state.ncursors; i++)
if (state.cursor_list[i])
db_driver_close_cursor(state.cursor_list[i]);
if (state.cursor_list)
db_free(state.cursor_list);
state.ncursors = 0;
state.cursor_list = NULL;
}
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