binmode

/*
 *  call-seq:
 *     ios.binmode    => ios
 *  
 *  Puts <em>ios</em> into binary mode. This is useful only in
 *  MS-DOS/Windows environments. Once a stream is in binary mode, it
 *  cannot be reset to nonbinary mode.
 */

VALUE
rb_io_binmode(io)
    VALUE io;
{
#if defined(_WIN32) || defined(DJGPP) || defined(__CYGWIN__) || defined(__human68k__) || defined(__EMX__)
    OpenFile *fptr;

    GetOpenFile(io, fptr);
#ifdef __human68k__
    if (fptr->f)
        fmode(fptr->f, _IOBIN);
    if (fptr->f2)
        fmode(fptr->f2, _IOBIN);
#else
    if (fptr->f && setmode(fileno(fptr->f), O_BINARY) == -1)
        rb_sys_fail(fptr->path);
    if (fptr->f2 && setmode(fileno(fptr->f2), O_BINARY) == -1)
        rb_sys_fail(fptr->path);
#endif

    fptr->mode |= FMODE_BINMODE;
#endif
    return io;
}