Look at the code, man!
Code:szLine = g_szBuffer;
while (szLine)
{
// Find the end of the current line
szLineEnd = strstr(szLine, "\r\n");
if (szLineEnd)
{
szLineEnd += 2;
// Add line end - line start to the counter
g_ulMsgRead += (szLineEnd - szLine);
}
...
szLine = szLineEnd;
}