Function create_temp_file

mysys/mf_tempfile.c:57–177

*/

File create_temp_file(char *to, const char *dir, const char *prefix,
		      int mode __attribute__((unused)),
		      myf MyFlags __attribute__((unused)))
{
  File file= -1;
#ifdef __WIN__
  TCHAR path_buf[MAX_PATH-14];
#endif

  DBUG_ENTER("create_temp_file");
  DBUG_PRINT("enter", ("dir: %s, prefix: %s", dir, prefix));
#if defined (__WIN__)

   /*
     Use GetTempPath to determine path for temporary files.
     This is because the documentation for GetTempFileName 
     has the following to say about this parameter:
     "If this parameter is NULL, the function fails."
   */
   if (!dir)
   {
     if(GetTempPath(sizeof(path_buf), path_buf) > 0) 
       dir = path_buf;
   }
   /*
     Use GetTempFileName to generate a unique filename, create
     the file and release it's handle
      - uses up to the first three letters from prefix
   */
  if (GetTempFileName(dir, prefix, 0, to) == 0)
    DBUG_RETURN(-1);

  DBUG_PRINT("info", ("name: %s", to));

  /*
    Open the file without the "open only if file doesn't already exist"
    since the file has already been created by GetTempFileName
  */
  if ((file= my_open(to,  (mode & ~O_EXCL), MyFlags)) < 0)
  {
    /* Open failed, remove the file created by GetTempFileName */
    int tmp= my_errno;
    (void) my_delete(to, MYF(0));
    my_errno= tmp;
  }

#elif defined(HAVE_MKSTEMP)
  {
    char prefix_buff[30];
    uint pfx_len;
    File org_file;

    pfx_len= (uint) (strmov(strnmov(prefix_buff,
				    prefix ? prefix : "tmp.",
				    sizeof(prefix_buff)-7),"XXXXXX") -
		     prefix_buff);
    if (!dir && ! (dir =getenv("TMPDIR")))
      dir= DEFAULT_TMPDIR;