LineLength
int32 LineLength(int32 index) const;
if (fTextBuffer->LineLength(end.y) < end.x
const int LineLength = 79;
char TempString [LineLength+1];
TempString[LineLength] = 0; /* Only needs to be done once. */
strncpy (TempString, TextPntr, LineLength);
if (StringPntr - TempString < LineLength)