Hi,

Looking for some good log / debug witing tips and found this. Can someone explain what how this works to a kind of newbie please.
Thanks


int fw__debug_level;

int
fw__debug (char *f, ...)
{
va_list ap;
va_start (ap, f);

if (fw__debug_level >= 2)
{
/* print info commented to stdout */
fprintf (stdout, "\n<!-- \n");
vfprintf (stdout, f, ap);
fprintf (stdout, "\n -->\n");
fflush (stdout);
}

if (fw__debug_level >= 3)
{
/* also print info to stderr */
vfprintf (stderr, f, ap);
fflush (stderr);
}

if (fw__debug_level >= 4)
{
/* also print direct to stdout */
vfprintf (stdout, f, ap);
fflush (stdout);
}

va_end (ap);

return 0;
}

I presume you're curious about the va_list/va_start/va_end "variable arguments" stuff. Here's a good article that might help:

http://www.codeproject.com/cpp/C___V..._Arguments.asp

Thanks Paul