20000412-6.c

this is a gcc file, you can download it and learn its usetility, for further detail please look at t

unsigned bug (unsigned short value, unsigned short *buffer,
              unsigned short *bufend);

unsigned short buf[] = {1, 4, 16, 64, 256};
int main()
{
  if (bug (512, buf, buf + 3) != 491)
    abort ();

  exit (0);
}

unsigned
bug (unsigned short value, unsigned short *buffer, unsigned short *bufend)
{
  unsigned short *tmp;

  for (tmp = buffer; tmp < bufend; tmp++)
    value -= *tmp;

  return value;
}