// -----------------------------------------------------------------------
// reader

#if 0
rune
bufio·getrune(io·Buffer *buf)
{
    ubyte b;
    int   i;
    byte  str[UTFmax+1];
    rune  r;

    // NOTE: I'm worried about the sign here...
    b = bufio·getbyte(buf);
    if (b < RuneSelf) {
        buf->runesize = 1;
        return b;
    }

    i = 0;
    str[i++] = b;

nextbyte:
    b = bufio·getbyte(buf);
    if (b < 0)            return b;
    if (i >= arrlen(str)) return RuneErr;
    str[i++] = b;
    if (!utf8·fullrune(str, i))
        goto nextbyte;

    buf->runesize = utf8·bytetorune(&r, str);
    if (r == RuneErr && b == 1) {
        errorf("illegal UTF-8 sequence");
		for (; i >= 0; i--)
			errorf("%s%.2x", i > 0 ? " " : "", *(ubyte*)(str+i));
		errorf("\n");

        buf->runesize = 0;
    } else
        for (; i > buf->runesize; i--)
            bufio·ungetbyte(buf, str[i]);

    return r;
}

// TODO: Check that we are given the correct rune!
error
bufio·ungetrune(io·Buffer *buf, rune r)
{
    if (buf->state & bufio·rdr) {
        errorf("attempted to unget on non-active reader");
        return bufio·err;
    }

    if (buf->pos == buf->buf) {
        errorf("attempted to unget past end of buffer");
        return bufio·err;
    }

    buf->pos -= buf->runesize;
    return 0;
}
#endif

// -----------------------------------------------------------------------
// writer