Function fill_buffer_retaining

extra/replace.c:966–1006

(fd,n)

*/

static int fill_buffer_retaining(fd,n)
File fd;
int n;
{
  int i;

  /* See if we need to grow the buffer. */
  if ((int) bufalloc - n <= bufread)
  {
    while ((int) bufalloc - n <= bufread)
    {
      bufalloc *= 2;
      bufread *= 2;
    }
    buffer = my_realloc(buffer, bufalloc+1, MYF(MY_WME));
    if (! buffer)
      return(-1);
  }

  /* Shift stuff down. */
  bmove(buffer,buffer+bufbytes-n,(uint) n);
  bufbytes = n;

  if (my_eof)
    return 0;

  /* Read in new stuff. */
  if ((i=(int) my_read(fd, (uchar*) buffer + bufbytes,
                       (size_t) bufread, MYF(MY_WME))) < 0)
    return -1;

  /* Kludge to pretend every nonempty file ends with a newline. */
  if (i == 0 && bufbytes > 0 && buffer[bufbytes - 1] != '\n')
  {
    my_eof = i = 1;
    buffer[bufbytes] = '\n';
  }

  bufbytes += i;
  return i;
}

	/* Return 0 if convert is ok */
	/* Global variable update is set if something was changed */