driver_state.c

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#include <stdlib.h>
#include <grass/dbmi.h>
#include "dbstubs.h"


static dbDriverState state;

void db__init_driver_state(void)
{
    db_zero((void *)&state, sizeof(state));
}

dbDriverState *db__get_driver_state(void)
{
    return &state;
}

int db__test_database_open(void)
{
    return state.open ? 1 : 0;
}

void db__mark_database_open(const char *dbname, const char *dbschema)
{
    state.dbname = db_store(dbname);
    state.dbschema = db_store(dbschema);
    state.open = 1;
}

void db__mark_database_closed(void)
{
    db_free(state.dbname);
    db_free(state.dbschema);
    state.open = 0;
}

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;
}

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;
}

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;
}