codepage_convert
#define ASCEBC(addr,nr) codepage_convert(_ascebc, addr, nr)
#define EBCASC(addr,nr) codepage_convert(_ebcasc, addr, nr)
#define ASCEBC_500(addr,nr) codepage_convert(_ascebc_500, addr, nr)
#define EBCASC_500(addr,nr) codepage_convert(_ebcasc_500, addr, nr)
#define EBC_TOLOWER(addr,nr) codepage_convert(_ebc_tolower, addr, nr)
#define EBC_TOUPPER(addr,nr) codepage_convert(_ebc_toupper, addr, nr)
codepage_convert(tp->view.ascebc, cp, len);