mariadb/mysys/my_lread.c

/* 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 */