=item B<PerlIO_stdoutf(fmt,...)>
This is printf() equivalent. printf is #defined to this function,
-so it is (currently) legal to use printf(fmt,...) in perl sources.
+so it is (currently) legal to use C<printf(fmt,...)> in perl sources.
=item B<PerlIO_read(f,buf,count)>, B<PerlIO_write(f,buf,count)>