paste_option_changed(void)
{
    static int	old_p_paste = FALSE;
    static int	save_sm = 0;
    static int	save_sta = 0;
#ifdef FEAT_CMDL_INFO
    static int	save_ru = 0;
#endif
#ifdef FEAT_RIGHTLEFT
    static int	save_ri = 0;
    static int	save_hkmap = 0;
#endif
    buf_T	*buf;

    if (p_paste)
    {
	/*
	 * Paste switched from off to on.
	 * Save the current values, so they can be restored later.
	 */
	if (!old_p_paste)
	{
	    // save options for each buffer
	    FOR_ALL_BUFFERS(buf)
	    {
		buf->b_p_tw_nopaste = buf->b_p_tw;
		buf->b_p_wm_nopaste = buf->b_p_wm;
		buf->b_p_sts_nopaste = buf->b_p_sts;
		buf->b_p_ai_nopaste = buf->b_p_ai;
		buf->b_p_et_nopaste = buf->b_p_et;
#ifdef FEAT_VARTABS
		if (buf->b_p_vsts_nopaste)
		    vim_free(buf->b_p_vsts_nopaste);
		buf->b_p_vsts_nopaste = buf->b_p_vsts && buf->b_p_vsts != empty_option
				     ? vim_strsave(buf->b_p_vsts) : NULL;
#endif
	    }

	    // save global options
	    save_sm = p_sm;
	    save_sta = p_sta;
#ifdef FEAT_CMDL_INFO
	    save_ru = p_ru;
#endif
#ifdef FEAT_RIGHTLEFT
	    save_ri = p_ri;
	    save_hkmap = p_hkmap;
#endif
	    // save global values for local buffer options
	    p_ai_nopaste = p_ai;
	    p_et_nopaste = p_et;
	    p_sts_nopaste = p_sts;
	    p_tw_nopaste = p_tw;
	    p_wm_nopaste = p_wm;
#ifdef FEAT_VARTABS
	    if (p_vsts_nopaste)
		vim_free(p_vsts_nopaste);
	    p_vsts_nopaste = p_vsts && p_vsts != empty_option ? vim_strsave(p_vsts) : NULL;
#endif
	}

	/*
	 * Always set the option values, also when 'paste' is set when it is
	 * already on.
	 */
	// set options for each buffer
	FOR_ALL_BUFFERS(buf)
	{
	    buf->b_p_tw = 0;	    // textwidth is 0
	    buf->b_p_wm = 0;	    // wrapmargin is 0
	    buf->b_p_sts = 0;	    // softtabstop is 0
	    buf->b_p_ai = 0;	    // no auto-indent
	    buf->b_p_et = 0;	    // no expandtab
#ifdef FEAT_VARTABS
	    if (buf->b_p_vsts)
		free_string_option(buf->b_p_vsts);
	    buf->b_p_vsts = empty_option;
	    VIM_CLEAR(buf->b_p_vsts_array);
#endif
	}

	// set global options
	p_sm = 0;		    // no showmatch
	p_sta = 0;		    // no smarttab
#ifdef FEAT_CMDL_INFO
	if (p_ru)
	    status_redraw_all();    // redraw to remove the ruler
	p_ru = 0;		    // no ruler
#endif
#ifdef FEAT_RIGHTLEFT
	p_ri = 0;		    // no reverse insert
	p_hkmap = 0;		    // no Hebrew keyboard
#endif
	// set global values for local buffer options
	p_tw = 0;
	p_wm = 0;
	p_sts = 0;
	p_ai = 0;
#ifdef FEAT_VARTABS
	if (p_vsts)
	    free_string_option(p_vsts);
	p_vsts = empty_option;
#endif
    }

    /*
     * Paste switched from on to off: Restore saved values.
     */
    else if (old_p_paste)
    {
	// restore options for each buffer
	FOR_ALL_BUFFERS(buf)
	{
	    buf->b_p_tw = buf->b_p_tw_nopaste;
	    buf->b_p_wm = buf->b_p_wm_nopaste;
	    buf->b_p_sts = buf->b_p_sts_nopaste;
	    buf->b_p_ai = buf->b_p_ai_nopaste;
	    buf->b_p_et = buf->b_p_et_nopaste;
#ifdef FEAT_VARTABS
	    if (buf->b_p_vsts)
		free_string_option(buf->b_p_vsts);
	    buf->b_p_vsts = buf->b_p_vsts_nopaste
			 ? vim_strsave(buf->b_p_vsts_nopaste) : empty_option;
	    vim_free(buf->b_p_vsts_array);
	    if (buf->b_p_vsts && buf->b_p_vsts != empty_option)
		(void)tabstop_set(buf->b_p_vsts, &buf->b_p_vsts_array);
	    else
		buf->b_p_vsts_array = NULL;
#endif
	}

	// restore global options
	p_sm = save_sm;
	p_sta = save_sta;
#ifdef FEAT_CMDL_INFO
	if (p_ru != save_ru)
	    status_redraw_all();    // redraw to draw the ruler
	p_ru = save_ru;
#endif
#ifdef FEAT_RIGHTLEFT
	p_ri = save_ri;
	p_hkmap = save_hkmap;
#endif
	// set global values for local buffer options
	p_ai = p_ai_nopaste;
	p_et = p_et_nopaste;
	p_sts = p_sts_nopaste;
	p_tw = p_tw_nopaste;
	p_wm = p_wm_nopaste;
#ifdef FEAT_VARTABS
	if (p_vsts)
	    free_string_option(p_vsts);
	p_vsts = p_vsts_nopaste ? vim_strsave(p_vsts_nopaste) : empty_option;
#endif
    }

    old_p_paste = p_paste;
}