/* 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; 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */

/* Open a temporary file and cache it with io_cache. Delete it on close */

#include "mysys_priv.h"
#include <mystrings/m_string.h>
#include <mysys/my_static.h>
#include <mysys/mysys_err.h>
#include <mysys/iocache.h>


	/*
	** Open tempfile cached by IO_CACHE
	** Should be used when no seeks are done (only reinit_io_buff)
	** Return 0 if cache is inited ok
	** The actual file is created when the IO_CACHE buffer gets filled
	** If dir is not given, use TMPDIR.
	*/

bool open_cached_file(IO_CACHE *cache, const char* dir, const char *prefix,
                         size_t cache_size, myf cache_myflags)
{
  cache->dir=	 dir ? my_strdup(dir,MYF(cache_myflags & MY_WME)) : (char*) 0;
  cache->prefix= (prefix ? my_strdup(prefix,MYF(cache_myflags & MY_WME)) :
		 (char*) 0);
  cache->file_name=0;
  cache->buffer=0;				/* Mark that not open */
  if (!init_io_cache(cache,-1,cache_size,WRITE_CACHE,0L,0,
		     MYF(cache_myflags | MY_NABP)))
  {
    return(0);
  }
  free(cache->dir);
  free(cache->prefix);
  return(1);
}

	/* Create the temporary file */

bool real_open_cached_file(IO_CACHE *cache)
{
  char name_buff[FN_REFLEN];
  int error=1;
  if ((cache->file=create_temp_file(name_buff, cache->dir, cache->prefix,
				    (O_RDWR | O_TRUNC),
				    MYF(MY_WME))) >= 0)
  {
    error=0;
    my_delete(name_buff,MYF(MY_WME | ME_NOINPUT));
  }
  return(error);
}


void close_cached_file(IO_CACHE *cache)
{
  if (my_b_inited(cache))
  {
    File file=cache->file;
    cache->file= -1;				/* Don't flush data */
    (void) end_io_cache(cache);
    if (file >= 0)
    {
      (void) my_close(file,MYF(0));
#ifdef CANT_DELETE_OPEN_FILES
      if (cache->file_name)
      {
	(void) my_delete(cache->file_name,MYF(MY_WME | ME_NOINPUT));
	free(cache->file_name);
      }
#endif
    }
    free(cache->dir);
    free(cache->prefix);
  }
  return;
}