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72 lines
1.4 KiB
72 lines
1.4 KiB
/*-
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* See the file LICENSE for redistribution information.
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*
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* Copyright (c) 1997, 1998, 1999
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* Sleepycat Software. All rights reserved.
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*/
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#include "db_config.h"
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#ifndef lint
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static const char sccsid[] = "@(#)os_seek.c 11.3 (Sleepycat) 10/29/99";
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#endif /* not lint */
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#ifndef NO_SYSTEM_INCLUDES
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#include <sys/types.h>
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#include <errno.h>
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#include <stdlib.h>
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#ifdef _MSC_VER /* _WIN32 */
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#include <io.h>
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#else
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#include <unistd.h>
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#endif
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#endif
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#include "db_int.h"
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#include "os_jump.h"
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/*
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* CDB___os_seek --
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* Seek to a page/byte offset in the file.
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*
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* PUBLIC: int CDB___os_seek
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* PUBLIC: __P((DB_FH *, size_t, db_pgno_t, u_int32_t, int, DB_OS_SEEK));
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*/
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int
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CDB___os_seek(fhp, pgsize, pageno, relative, isrewind, db_whence)
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DB_FH *fhp;
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size_t pgsize;
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db_pgno_t pageno;
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u_int32_t relative;
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int isrewind;
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DB_OS_SEEK db_whence;
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{
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off_t offset;
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int whence;
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switch (db_whence) {
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case DB_OS_SEEK_CUR:
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whence = SEEK_CUR;
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break;
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case DB_OS_SEEK_END:
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whence = SEEK_END;
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break;
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case DB_OS_SEEK_SET:
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whence = SEEK_SET;
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break;
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default:
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return (EINVAL);
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}
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if (CDB___db_jump.j_seek != NULL)
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return (CDB___db_jump.j_seek(fhp->fd, pgsize, pageno,
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relative, isrewind, whence) == -1 ? CDB___os_get_errno() : 0);
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offset = (off_t)pgsize * pageno + relative;
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if (isrewind)
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offset = -offset;
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return (lseek(fhp->fd, offset, whence) == -1 ? CDB___os_get_errno() : 0);
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}
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