Deleting Data Woefully Slow

[Mark Wieder]

Richard-

Thursday, March 25, 2010, 5:19:35 PM, you wrote:

> I'm afraid that one has me mystified as well.  It may have something to
> do with what the engine has to do to traverse to the end of a chunk, but
> I can't imagine why the difference would be so much.

If I were coding this in C I'd probably do something like (warning:
untested code I'm making up on the spot out of the dim recesses of my
memory):

char *FindEndOfFirstLine(char *pText)
{
  char *pChar;

  while(*pChar++)
  {
    if('\n' == *pChar)
    {
      // *++pChar = 0;
      break;
    }
  }
  return pChar;
}

char *FindLastLine(char *pText)
{
  char *pChar;

  pChar = pText;
  pText += length(pText);
  if('\n' == *pChar)
    pChar--;
  while('\n' != *pChar--)
  {
    if (pChar == pText)
      break;
  }
  // *++pChar = 0;
  return pChar;
}

So I'd allow a little extra time for the length() call, but I wouldn't
expect an order of magnitude difference.

-- 
-Mark Wieder
 mwieder at ahsoftware.net