my_seek.c
上传用户:romrleung
上传日期:2022-05-23
资源大小:18897k
文件大小:2k
- /* Copyright (C) 2000 MySQL AB
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
- (at your option) any later version.
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
- #include "mysys_priv.h"
- /* Seek to position in file */
- /*ARGSUSED*/
- my_off_t my_seek(File fd, my_off_t pos, int whence,
- myf MyFlags __attribute__((unused)))
- {
- reg1 os_off_t newpos;
- DBUG_ENTER("my_seek");
- DBUG_PRINT("my",("Fd: %d Hpos: %lu Pos: %lu Whence: %d MyFlags: %d",
- fd, (ulong) (((ulonglong) pos) >> 32), (ulong) pos,
- whence, MyFlags));
- DBUG_ASSERT(pos != MY_FILEPOS_ERROR); /* safety check */
- newpos=lseek(fd, pos, whence);
- if (newpos == (os_off_t) -1)
- {
- my_errno=errno;
- DBUG_PRINT("error",("lseek: %lu, errno: %d",newpos,errno));
- DBUG_RETURN(MY_FILEPOS_ERROR);
- }
- if ((my_off_t) newpos != pos)
- {
- DBUG_PRINT("exit",("pos: %lu", (ulong) newpos));
- }
- DBUG_RETURN((my_off_t) newpos);
- } /* my_seek */
- /* Tell current position of file */
- /* ARGSUSED */
- my_off_t my_tell(File fd, myf MyFlags __attribute__((unused)))
- {
- os_off_t pos;
- DBUG_ENTER("my_tell");
- DBUG_PRINT("my",("Fd: %d MyFlags: %d",fd, MyFlags));
- #ifdef HAVE_TELL
- pos=tell(fd);
- #else
- pos=lseek(fd, 0L, MY_SEEK_CUR);
- #endif
- if (pos == (os_off_t) -1)
- my_errno=errno;
- DBUG_PRINT("exit",("pos: %lu", (ulong) pos));
- DBUG_RETURN((my_off_t) pos);
- } /* my_tell */