Counting Number of Lines of file

[dapernia]

Hi friends:

My program logs data into a .data file continuosly. I have a .cgi program that reads the lines in the file and shows it in a browser.

How can i make my program count the number of lines and when it reaches 10 lines then delete it? So i do't show a very large web page

Thanks
Daniel

[Prelude]

>How can i make my program count the number of lines and when it reaches 10 lines then delete it?
Basically the way to count how many lines are in a file you read the file line by line:

int countLines(FILE *in)
{
  char buff[LINELEN];
  int n = 0;

  rewind(in);
  while (fgets(buff, sizeof buff, in) != NULL)
    n++;

  return n;
}