qf_get_next_buf_line(qfstate_T *state)
{
    char_u	*p_buf = NULL;
    int		len;

    // Get the next line from the supplied buffer
    if (state->buflnum > state->lnumlast)
	return QF_END_OF_INPUT;

    p_buf = ml_get_buf(state->buf, state->buflnum, FALSE);
    state->buflnum += 1;

    len = (int)STRLEN(p_buf);
    if (len > IOSIZE - 2)
    {
	state->linebuf = qf_grow_linebuf(state, len);
	if (state->linebuf == NULL)
	    return QF_NOMEM;
    }
    else
    {
	state->linebuf = IObuff;
	state->linelen = len;
    }
    vim_strncpy(state->linebuf, p_buf, state->linelen);

    return QF_OK;
}