/*-
 * See the file LICENSE for redistribution information.
 *
 * Copyright (c) 1997, 1998
 *      Sleepycat Software.  All rights reserved.
 */

#include "config.h"

#ifndef lint
static const char sccsid[] = "@(#)os_seek.c     10.11 (Sleepycat) 10/12/98";
#endif /* not lint */

#ifndef NO_SYSTEM_INCLUDES
#include <sys/types.h>

#include <errno.h>
#include <unistd.h>
#endif

#include "db_int.h"
#include "os_jump.h"

/*
 * __os_seek --
 *      Seek to a page/byte offset in the file.
 *
 * PUBLIC: int __os_seek __P((int, size_t, db_pgno_t, u_int32_t, int, int));
 */
int
__os_seek(fd, pgsize, pageno, relative, isrewind, whence)
        int fd;
        size_t pgsize;
        db_pgno_t pageno;
        u_int32_t relative;
        int isrewind, whence;
{
        off_t offset;
        int ret;

        if (__db_jump.j_seek != NULL)
                ret = __db_jump.j_seek(fd,
                    pgsize, pageno, relative, isrewind, whence);
        else {
                offset = (off_t)pgsize * pageno + relative;
                if (isrewind)
                        offset = -offset;

                ret = lseek(fd, offset, whence);
        }
        return (ret == -1 ? errno : 0);
}