TESTCASE( _PDCLIB_filemode( "x" ) == 0 );
TESTCASE( _PDCLIB_filemode( "r++" ) == 0 );
TESTCASE( _PDCLIB_filemode( "wbb" ) == 0 );
TESTCASE( _PDCLIB_filemode( "x" ) == 0 );
TESTCASE( _PDCLIB_filemode( "r++" ) == 0 );
TESTCASE( _PDCLIB_filemode( "wbb" ) == 0 );