mirror of
https://github.com/MariaDB/server.git
synced 2025-01-18 04:53:01 +01:00
65 lines
1.3 KiB
C
65 lines
1.3 KiB
C
/*-
|
|
* See the file LICENSE for redistribution information.
|
|
*
|
|
* Copyright (c) 1997, 1998, 1999, 2000
|
|
* Sleepycat Software. All rights reserved.
|
|
*/
|
|
|
|
#include "db_config.h"
|
|
|
|
#ifndef lint
|
|
static const char revid[] = "$Id: os_seek.c,v 11.8 2000/05/17 19:30:19 bostic Exp $";
|
|
#endif /* not lint */
|
|
|
|
#include "db_int.h"
|
|
#include "os_jump.h"
|
|
|
|
/*
|
|
* __os_seek --
|
|
* Seek to a page/byte offset in the file.
|
|
*/
|
|
int
|
|
__os_seek(dbenv, fhp, pgsize, pageno, relative, isrewind, db_whence)
|
|
DB_ENV *dbenv;
|
|
DB_FH *fhp;
|
|
size_t pgsize;
|
|
db_pgno_t pageno;
|
|
u_int32_t relative;
|
|
int isrewind;
|
|
DB_OS_SEEK db_whence;
|
|
{
|
|
__int64 offset;
|
|
int ret, whence;
|
|
|
|
switch (db_whence) {
|
|
case DB_OS_SEEK_CUR:
|
|
whence = SEEK_CUR;
|
|
break;
|
|
case DB_OS_SEEK_END:
|
|
whence = SEEK_END;
|
|
break;
|
|
case DB_OS_SEEK_SET:
|
|
whence = SEEK_SET;
|
|
break;
|
|
default:
|
|
return (EINVAL);
|
|
}
|
|
|
|
if (__db_jump.j_seek != NULL)
|
|
ret = __db_jump.j_seek(fhp->fd, pgsize, pageno,
|
|
relative, isrewind, whence);
|
|
else {
|
|
offset = (__int64)pgsize * pageno + relative;
|
|
if (isrewind)
|
|
offset = -offset;
|
|
ret = _lseeki64(
|
|
fhp->fd, offset, whence) == -1 ? __os_get_errno() : 0;
|
|
}
|
|
|
|
if (ret != 0)
|
|
__db_err(dbenv, "seek: %lu %d %d: %s",
|
|
(u_long)pgsize * pageno + relative,
|
|
isrewind, db_whence, strerror(ret));
|
|
|
|
return (ret);
|
|
}
|