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/*
Copyright (c) 2000, 2001, 2004, 2006, 2007 MySQL AB, 2009 Sun Microsystems, Inc.
Use is subject to license terms.
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; version 2 of the License.
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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
/* USE_MY_STREAM isn't set because we can't thrust my_fclose! */
#include "mysys_priv.h"
#include "mysys_err.h"
#include <errno.h>
#include <stdio.h>
#ifdef HAVE_FSEEKO
#undef ftell
#undef fseek
#define ftell(A) ftello(A)
#define fseek(A,B,C) fseeko((A),(B),(C))
#endif
/*
Read a chunk of bytes from a FILE
SYNOPSIS
my_fread()
stream File descriptor
Buffer Buffer to read to
Count Number of bytes to read
MyFlags Flags on what to do on error
RETURN
(size_t) -1 Error
# Number of bytes read
*/
size_t my_fread(FILE *stream, uchar *Buffer, size_t Count, myf MyFlags)
{
size_t readbytes;
DBUG_ENTER("my_fread");
DBUG_PRINT("my",("stream: 0x%lx Buffer: 0x%lx Count: %u MyFlags: %d",
(long) stream, (long) Buffer, (uint) Count, MyFlags));
if ((readbytes= fread(Buffer, sizeof(char), Count, stream)) != Count)
{
DBUG_PRINT("error",("Read only %d bytes", (int) readbytes));
if (MyFlags & (MY_WME | MY_FAE | MY_FNABP))
{
if (ferror(stream))
my_error(EE_READ, MYF(ME_BELL+ME_WAITTANG),
my_filename(fileno(stream)),errno);
else
if (MyFlags & (MY_NABP | MY_FNABP))
my_error(EE_EOFERR, MYF(ME_BELL+ME_WAITTANG),
my_filename(fileno(stream)),errno);
}
my_errno=errno ? errno : -1;
if (ferror(stream) || MyFlags & (MY_NABP | MY_FNABP))
DBUG_RETURN((size_t) -1); /* Return with error */
}
if (MyFlags & (MY_NABP | MY_FNABP))
DBUG_RETURN(0); /* Read ok */
DBUG_RETURN(readbytes);
} /* my_fread */
/*
Write a chunk of bytes to a stream
my_fwrite()
stream File descriptor
Buffer Buffer to write from
Count Number of bytes to write
MyFlags Flags on what to do on error
RETURN
(size_t) -1 Error
# Number of bytes written
*/
size_t my_fwrite(FILE *stream, const uchar *Buffer, size_t Count, myf MyFlags)
{
size_t writtenbytes =0;
my_off_t seekptr;
#if !defined(NO_BACKGROUND) && defined(USE_MY_STREAM)
uint errors;
#endif
DBUG_ENTER("my_fwrite");
DBUG_PRINT("my",("stream: 0x%lx Buffer: 0x%lx Count: %u MyFlags: %d",
(long) stream, (long) Buffer, (uint) Count, MyFlags));
#if !defined(NO_BACKGROUND) && defined(USE_MY_STREAM)
errors=0;
#endif
seekptr= ftell(stream);
for (;;)
{
size_t written;
if ((written = (size_t) fwrite((char*) Buffer,sizeof(char),
Count, stream)) != Count)
{
DBUG_PRINT("error",("Write only %d bytes", (int) writtenbytes));
my_errno=errno;
if (written != (size_t) -1)
{
seekptr+=written;
Buffer+=written;
writtenbytes+=written;
Count-=written;
}
#ifdef EINTR
if (errno == EINTR)
{
VOID(my_fseek(stream,seekptr,MY_SEEK_SET,MYF(0)));
continue;
}
#endif
#if !defined(NO_BACKGROUND) && defined(USE_MY_STREAM)
#ifdef THREAD
if (my_thread_var->abort)
MyFlags&= ~ MY_WAIT_IF_FULL; /* End if aborted by user */
#endif
if ((errno == ENOSPC || errno == EDQUOT) &&
(MyFlags & MY_WAIT_IF_FULL))
{
wait_for_free_space("[stream]", errors);
errors++;
VOID(my_fseek(stream,seekptr,MY_SEEK_SET,MYF(0)));
continue;
}
#endif
if (ferror(stream) || (MyFlags & (MY_NABP | MY_FNABP)))
{
if (MyFlags & (MY_WME | MY_FAE | MY_FNABP))
{
my_error(EE_WRITE, MYF(ME_BELL+ME_WAITTANG),
my_filename(fileno(stream)),errno);
}
writtenbytes= (size_t) -1; /* Return that we got error */
break;
}
}
if (MyFlags & (MY_NABP | MY_FNABP))
writtenbytes= 0; /* Everything OK */
else
writtenbytes+= written;
break;
}
DBUG_RETURN(writtenbytes);
} /* my_fwrite */
/* Seek to position in file */
my_off_t my_fseek(FILE *stream, my_off_t pos, int whence,
myf MyFlags __attribute__((unused)))
{
DBUG_ENTER("my_fseek");
DBUG_PRINT("my",("stream: 0x%lx pos: %lu whence: %d MyFlags: %d",
(long) stream, (long) pos, whence, MyFlags));
DBUG_RETURN(fseek(stream, (off_t) pos, whence) ?
MY_FILEPOS_ERROR : (my_off_t) ftell(stream));
} /* my_seek */
/* Tell current position of file */
my_off_t my_ftell(FILE *stream, myf MyFlags __attribute__((unused)))
{
off_t pos;
DBUG_ENTER("my_ftell");
DBUG_PRINT("my",("stream: 0x%lx MyFlags: %d", (long) stream, MyFlags));
pos=ftell(stream);
DBUG_PRINT("exit",("ftell: %lu",(ulong) pos));
DBUG_RETURN((my_off_t) pos);
} /* my_ftell */
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