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/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free
Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
MA 02111-1301, 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 */
/* Returns (uint) -1 if error as my_read() */
uint my_fread(FILE *stream, unsigned char *Buffer, uint Count, myf MyFlags)
/* File descriptor */
/* Buffer must be at least count bytes */
/* Max number of bytes returnd */
/* Flags on what to do on error */
{
uint readbytes;
DBUG_ENTER("my_fread");
DBUG_PRINT("my",("stream: %lx Buffer: %lx Count: %u MyFlags: %d",
stream, Buffer, Count, MyFlags));
if ((readbytes = (uint) fread(Buffer,sizeof(char),(size_t) Count,stream))
!= Count)
{
DBUG_PRINT("error",("Read only %d bytes",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((uint) -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
** Returns (uint) -1 if error as my_write()
** Does retries if interrupted
*/
uint my_fwrite(FILE *stream, const unsigned char *Buffer, uint Count, myf MyFlags)
{
uint writenbytes=0;
off_t seekptr;
#if !defined(NO_BACKGROUND) && defined(USE_MY_STREAM)
uint errors;
#endif
DBUG_ENTER("my_fwrite");
DBUG_PRINT("my",("stream: %lx Buffer: %lx Count: %u MyFlags: %d",
stream, Buffer, Count, MyFlags));
#if !defined(NO_BACKGROUND) && defined(USE_MY_STREAM)
errors=0;
#endif
seekptr=ftell(stream);
for (;;)
{
uint writen;
if ((writen = (uint) fwrite((char*) Buffer,sizeof(char),
(size_t) Count, stream)) != Count)
{
DBUG_PRINT("error",("Write only %d bytes",writenbytes));
my_errno=errno;
if (writen != (uint) -1)
{
seekptr+=writen;
Buffer+=writen;
writenbytes+=writen;
Count-=writen;
}
#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 && (MyFlags & MY_WAIT_IF_FULL))
{
if (!(errors++ % MY_WAIT_GIVE_USER_A_MESSAGE))
my_error(EE_DISK_FULL,MYF(ME_BELL | ME_NOREFRESH));
sleep(MY_WAIT_FOR_USER_TO_FIX_PANIC);
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);
}
writenbytes=(uint) -1; /* Return that we got error */
break;
}
}
if (MyFlags & (MY_NABP | MY_FNABP))
writenbytes=0; /* Everything OK */
else
writenbytes+=writen;
break;
}
DBUG_RETURN(writenbytes);
} /* my_fwrite */
/* Seek to position in file */
/* ARGSUSED */
my_off_t my_fseek(FILE *stream, my_off_t pos, int whence, myf MyFlags)
{
DBUG_ENTER("my_fseek");
DBUG_PRINT("my",("stream: %lx pos: %lu whence: %d MyFlags: %d",
stream, 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 */
/* ARGSUSED */
my_off_t my_ftell(FILE *stream, myf MyFlags)
{
off_t pos;
DBUG_ENTER("my_ftell");
DBUG_PRINT("my",("stream: %lx MyFlags: %d",stream, MyFlags));
pos=ftell(stream);
DBUG_PRINT("exit",("ftell: %lu",(ulong) pos));
DBUG_RETURN((my_off_t) pos);
} /* my_ftell */
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