コード例 #1
0
ファイル: io.c プロジェクト: xianjimli/datasafe
static bool
sip (struct file_data *current, bool skip_test)
{
  /* If we have a nonexistent file at this stage, treat it as empty.  */
  if (current->desc < 0)
    {
      /* Leave room for a sentinel.  */
      current->bufsize = sizeof (word);
      current->buffer = xmalloc (current->bufsize);
    }
  else
    {
      current->bufsize = buffer_lcm (sizeof (word),
				     STAT_BLOCKSIZE (current->stat),
				     PTRDIFF_MAX - 2 * sizeof (word));
      current->buffer = xmalloc (current->bufsize);

      if (! skip_test)
	{
	  /* Check first part of file to see if it's a binary file.  */

	  /* FIXME: if O_BINARY, this should revert to text mode
	     if the file is not binary.  */

	  file_block_read (current, current->bufsize);
	  return binary_file_p (current->buffer, current->buffered);
	}
    }

  current->buffered = 0;
  current->eof = false;
  return false;
}
コード例 #2
0
ファイル: io.c プロジェクト: NaiyanXu/gitroot
static bool
sip (struct file_data *current, bool skip_test)
{
  /* If we have a nonexistent file at this stage, treat it as empty.  */
  if (current->desc < 0)
    {
      /* Leave room for a sentinel.  */
      current->bufsize = sizeof (word);
      current->buffer = xmalloc (current->bufsize);
    }
  else
    {
      current->bufsize = buffer_lcm (sizeof (word),
				     STAT_BLOCKSIZE (current->stat),
				     PTRDIFF_MAX - 2 * sizeof (word));
      current->buffer = xmalloc (current->bufsize);

#ifdef __KLIBC__
      /* Skip test if seek is not possible */
      skip_test = skip_test
		  || (lseek (current->desc, 0, SEEK_CUR) < 0
		      && errno == ESPIPE);
#endif

      if (! skip_test)
	{
	  /* Check first part of file to see if it's a binary file.  */

	  int prev_mode = set_binary_mode (current->desc, O_BINARY);
	  off_t buffered;
	  file_block_read (current, current->bufsize);
	  buffered = current->buffered;

	  if (prev_mode != O_BINARY)
	    {
	      /* Revert to text mode and seek back to the start to reread
		 the file.  Use relative seek, since file descriptors
		 like stdin might not start at offset zero.  */
	      if (lseek (current->desc, - buffered, SEEK_CUR) < 0)
		pfatal_with_name (current->name);
	      set_binary_mode (current->desc, prev_mode);
	      current->buffered = 0;
	      current->eof = false;
	    }

	  return binary_file_p (current->buffer, buffered);
	}
    }

  current->buffered = 0;
  current->eof = false;
  return false;
}
コード例 #3
0
static bool
sip (struct file_data *current, bool skip_test)
{
  /* If we have a nonexistent file at this stage, treat it as empty.  */
  if (current->desc < 0)
    {
      /* Leave room for a sentinel.  */
      current->bufsize = sizeof (word);
      current->buffer = xmalloc (current->bufsize);
    }
  else
    {
      current->bufsize = buffer_lcm (sizeof (word),
				     STAT_BLOCKSIZE (current->stat),
				     PTRDIFF_MAX - 2 * sizeof (word));
      current->buffer = xmalloc (current->bufsize);

      if (! skip_test)
	{
	  /* Check first part of file to see if it's a binary file.  */

	  bool was_binary = set_binary_mode (current->desc, true);
	  off_t buffered;
	  file_block_read (current, current->bufsize);
	  buffered = current->buffered;

	  if (! was_binary)
	    {
	      /* Revert to text mode and seek back to the beginning to
		 reread the file.  Use relative seek, since file
		 descriptors like stdin might not start at offset
		 zero.  */

	      if (lseek (current->desc, - buffered, SEEK_CUR) == -1)
		pfatal_with_name (current->name);
	      set_binary_mode (current->desc, false);
	      current->buffered = 0;
	      current->eof = false;
	    }

	  return binary_file_p (current->buffer, buffered);
	}
    }

  current->buffered = 0;
  current->eof = false;
  return false;
}