Returns true if the named file exists and has a zero size.
/*
* call-seq:
* File.zero?(file_name) => true or false
*
* Returns <code>true</code> if the named file exists and has
* a zero size.
*/
static VALUE
test_z(obj, fname)
VALUE obj, fname;
{
struct stat st;
if (rb_stat(fname, &st) < 0) return Qfalse;
if (st.st_size == 0) return Qtrue;
return Qfalse;
}