my_lread.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"
- #include "mysys_err.h"
- /* Read a chunk of bytes from a file */
- uint32 my_lread(int Filedes, byte *Buffer, uint32 Count, myf MyFlags)
- /* File descriptor */
- /* Buffer must be at least count bytes */
- /* Max number of bytes returnd */
- /* Flags on what to do on error */
- {
- uint32 readbytes;
- DBUG_ENTER("my_lread");
- DBUG_PRINT("my",("Fd: %d Buffer: %ld Count: %ld MyFlags: %d",
- Filedes, Buffer, Count, MyFlags));
- /* Temp hack to get count to int32 while read wants int */
- if ((readbytes = (uint32) read(Filedes, Buffer, (uint) Count)) != Count)
- {
- my_errno=errno;
- if (MyFlags & (MY_WME | MY_FAE | MY_FNABP))
- {
- if (readbytes == MY_FILE_ERROR)
- my_error(EE_READ, MYF(ME_BELL+ME_WAITTANG),
- my_filename(Filedes),errno);
- else
- if (MyFlags & (MY_NABP | MY_FNABP))
- my_error(EE_EOFERR, MYF(ME_BELL+ME_WAITTANG),
- my_filename(Filedes),errno);
- }
- if (readbytes == MY_FILE_ERROR || MyFlags & (MY_NABP | MY_FNABP))
- DBUG_RETURN((uint32) -1); /* Return med felkod */
- }
- if (MyFlags & (MY_NABP | MY_FNABP))
- DBUG_RETURN(0); /* Ok vid l{sning */
- DBUG_RETURN(readbytes);
- } /* my_lread */