ins_eol(int c)
{
    int	    i;

    if (echeck_abbr(c + ABBR_OFF))
	return OK;
    if (stop_arrow() == FAIL)
	return FAIL;
    undisplay_dollar();

    /*
     * Strange Vi behaviour: In Replace mode, typing a NL will not delete the
     * character under the cursor.  Only push a NUL on the replace stack,
     * nothing to put back when the NL is deleted.
     */
    if ((State & REPLACE_FLAG) && !(State & VREPLACE_FLAG))
	replace_push(NUL);

    /*
     * In VREPLACE mode, a NL replaces the rest of the line, and starts
     * replacing the next line, so we push all of the characters left on the
     * line onto the replace stack.  This is not done here though, it is done
     * in open_line().
     */

    // Put cursor on NUL if on the last char and coladd is 1 (happens after
    // CTRL-O).
    if (virtual_active() && curwin->w_cursor.coladd > 0)
	coladvance(getviscol());

#ifdef FEAT_RIGHTLEFT
    // NL in reverse insert will always start in the end of
    // current line.
    if (revins_on)
	curwin->w_cursor.col += (colnr_T)STRLEN(ml_get_cursor());
#endif

    AppendToRedobuff(NL_STR);
    i = open_line(FORWARD,
	    has_format_option(FO_RET_COMS) ? OPENLINE_DO_COM : 0, old_indent,
	    NULL);
    old_indent = 0;
#ifdef FEAT_CINDENT
    can_cindent = TRUE;
#endif
#ifdef FEAT_FOLDING
    // When inserting a line the cursor line must never be in a closed fold.
    foldOpenCursor();
#endif

    return i;
}


patch 9.0.0018: going over the end of the typahead

Problem:    Going over the end of the typahead.
Solution:   Put a NUL after the typeahead.

term_7to8bit(char_u *p)
{
    if (*p == ESC)
    {
	if (p[1] == '[')
	    return CSI;
	if (p[1] == ']')
	    return OSC;
	if (p[1] == 'O')
	    return 0x8f;
    }
    return 0;
}

Integer Overflow or Wraparound in GitHub repository vim/vim prior to 9.0.


termcapinit(char_u *name)
{
    char_u	*term;

    if (name != NULL && *name == NUL)
	name = NULL;	    // empty name is equal to no name
    term = name;

#ifndef MSWIN
    if (term == NULL)
	term = mch_getenv((char_u *)"TERM");
#endif
    if (term == NULL || *term == NUL)
	term = DEFAULT_TERM;
    set_string_option_direct((char_u *)"term", -1, term, OPT_FREE, 0);

    // Set the default terminal name.
    set_string_default("term", term);
    set_string_default("ttytype", term);

    /*
     * Avoid using "term" here, because the next mch_getenv() may overwrite it.
     */
    set_termname(T_NAME != NULL ? T_NAME : term);
}


out_str(char_u *s)
{
    if (s != NULL && *s)
    {
#ifdef FEAT_GUI
	// Don't use tputs() when GUI is used, ncurses crashes.
	if (gui.in_use)
	{
	    out_str_nf(s);
	    return;
	}
#endif
	// avoid terminal strings being split up
	if (out_pos > OUT_SIZE - MAX_ESC_SEQ_LEN)
	    out_flush();
#ifdef HAVE_TGETENT
	tputs((char *)s, 1, TPUTSFUNCAST out_char_nf);
#else
	while (*s)
	    out_char_nf(*s++);
#endif

	// For testing we write one string at a time.
	if (p_wd)
	    out_flush();
    }
}


cterm_color2rgb(int nr, char_u *r, char_u *g, char_u *b, char_u *ansi_idx)
{
    int idx;

    if (nr < 16)
    {
#if defined(MSWIN)
	idx = cterm_ansi_idx[nr];
#else
	idx = nr;
#endif
	*r = ansi_table[idx][0];
	*g = ansi_table[idx][1];
	*b = ansi_table[idx][2];
	*ansi_idx = idx + 1;
    }
    else if (nr < 232)
    {
	// 216 color cube
	idx = nr - 16;
	*r = cube_value[idx / 36 % 6];
	*g = cube_value[idx / 6  % 6];
	*b = cube_value[idx      % 6];
	*ansi_idx = ANSI_INDEX_NONE;
    }
    else if (nr < 256)
    {
	// 24 grey scale ramp
	idx = nr - 232;
	*r = grey_ramp[idx];
	*g = grey_ramp[idx];
	*b = grey_ramp[idx];
	*ansi_idx = ANSI_INDEX_NONE;
    }
    else
    {
	*r = 0;
	*g = 0;
	*b = 0;
	*ansi_idx = ANSI_INDEX_NONE;
    }
}


may_adjust_color_count(int val)
{
    if (val != t_colors)
    {
	// Nr of colors changed, initialize highlighting and
	// redraw everything.  This causes a redraw, which usually
	// clears the message.  Try keeping the message if it
	// might work.
	set_keep_msg_from_hist();
	set_color_count(val);
	init_highlight(TRUE, FALSE);
# ifdef DEBUG_TERMRESPONSE
	{
	    int r = redraw_asap(CLEAR);

	    log_tr("Received t_Co, redraw_asap(): %d", r);
	}
# else
	redraw_asap(CLEAR);
# endif
    }
}


limit_screen_size(void)
{
    if (Columns < MIN_COLUMNS)
	Columns = MIN_COLUMNS;
    else if (Columns > 10000)
	Columns = 10000;
    if (Rows > 1000)
	Rows = 1000;
}


find_termcode(char_u *name)
{
    int	    i;

    for (i = 0; i < tc_len; ++i)
	if (termcodes[i].name[0] == name[0] && termcodes[i].name[1] == name[1])
	    return termcodes[i].code;
    return NULL;
}


clear_termcodes(void)
{
    while (tc_len > 0)
	vim_free(termcodes[--tc_len].code);
    VIM_CLEAR(termcodes);
    tc_max_len = 0;

#ifdef HAVE_TGETENT
    BC = (char *)empty_option;
    UP = (char *)empty_option;
    PC = NUL;			// set pad character to NUL
    ospeed = 0;
#endif

    need_gather = TRUE;		// need to fill termleader[]
}


gather_termleader(void)
{
    int	    i;
    int	    len = 0;

#ifdef FEAT_GUI
    if (gui.in_use)
	termleader[len++] = CSI;    // the GUI codes are not in termcodes[]
#endif
#ifdef FEAT_TERMRESPONSE
    if (check_for_codes || *T_CRS != NUL)
	termleader[len++] = DCS;    // the termcode response starts with DCS
				    // in 8-bit mode
#endif
    termleader[len] = NUL;

    for (i = 0; i < tc_len; ++i)
	if (vim_strchr(termleader, termcodes[i].code[0]) == NULL)
	{
	    termleader[len++] = termcodes[i].code[0];
	    termleader[len] = NUL;
	}

    need_gather = FALSE;
}


parse_builtin_tcap(char_u *term)
{
    struct builtin_term	    *p;
    char_u		    name[2];
    int			    term_8bit;

    p = find_builtin_term(term);
    term_8bit = term_is_8bit(term);

    // Do not parse if builtin term not found
    if (p->bt_string == NULL)
	return;

    for (++p; p->bt_entry != (int)KS_NAME && p->bt_entry != BT_EXTRA_KEYS; ++p)
    {
	if ((int)p->bt_entry >= 0)	// KS_xx entry
	{
	    // Only set the value if it wasn't set yet.
	    if (term_strings[p->bt_entry] == NULL
				 || term_strings[p->bt_entry] == empty_option)
	    {
#ifdef FEAT_EVAL
		int opt_idx = -1;
#endif
		// 8bit terminal: use CSI instead of <Esc>[
		if (term_8bit && term_7to8bit((char_u *)p->bt_string) != 0)
		{
		    char_u  *s, *t;

		    s = vim_strsave((char_u *)p->bt_string);
		    if (s != NULL)
		    {
			for (t = s; *t; ++t)
			    if (term_7to8bit(t))
			    {
				*t = term_7to8bit(t);
				STRMOVE(t + 1, t + 2);
			    }
			term_strings[p->bt_entry] = s;
#ifdef FEAT_EVAL
			opt_idx =
#endif
				  set_term_option_alloced(
						   &term_strings[p->bt_entry]);
		    }
		}
		else
		{
		    term_strings[p->bt_entry] = (char_u *)p->bt_string;
#ifdef FEAT_EVAL
		    opt_idx = get_term_opt_idx(&term_strings[p->bt_entry]);
#endif
		}
#ifdef FEAT_EVAL
		set_term_option_sctx_idx(NULL, opt_idx);
#endif
	    }
	}
	else
	{
	    name[0] = KEY2TERMCAP0((int)p->bt_entry);
	    name[1] = KEY2TERMCAP1((int)p->bt_entry);
	    if (find_termcode(name) == NULL)
		add_termcode(name, (char_u *)p->bt_string, term_8bit);
	}
    }
}


term_append_lines(int line_count)
{
    OUT_STR(tgoto((char *)T_CAL, 0, line_count));
}


is_mouse_topline(win_T *wp)
{
    return orig_topline == wp->w_topline
#ifdef FEAT_DIFF
	&& orig_topfill == wp->w_topfill
#endif
	;
}


may_req_bg_color(void)
{
    if (can_get_termresponse() && starting == 0)
    {
	int didit = FALSE;

# ifdef FEAT_TERMINAL
	// Only request foreground if t_RF is set.
	if (rfg_status.tr_progress == STATUS_GET && *T_RFG != NUL)
	{
	    MAY_WANT_TO_LOG_THIS;
	    LOG_TR(("Sending FG request"));
	    out_str(T_RFG);
	    termrequest_sent(&rfg_status);
	    didit = TRUE;
	}
# endif

	// Only request background if t_RB is set.
	if (rbg_status.tr_progress == STATUS_GET && *T_RBG != NUL)
	{
	    MAY_WANT_TO_LOG_THIS;
	    LOG_TR(("Sending BG request"));
	    out_str(T_RBG);
	    termrequest_sent(&rbg_status);
	    didit = TRUE;
	}

	if (didit)
	{
	    // check for the characters now, otherwise they might be eaten by
	    // get_keystroke()
	    out_flush();
	    (void)vpeekc_nomap();
	}
    }
}


req_more_codes_from_term(void)
{
    char	buf[23];  // extra size to shut up LGTM
    int		old_idx = xt_index_out;

    // Don't do anything when going to exit.
    if (exiting)
	return;

    // Send up to 10 more requests out than we received.  Avoid sending too
    // many, there can be a buffer overflow somewhere.
    while (xt_index_out < xt_index_in + 10 && key_names[xt_index_out] != NULL)
    {
	char *key_name = key_names[xt_index_out];

	MAY_WANT_TO_LOG_THIS;
	LOG_TR(("Requesting XT %d: %s", xt_index_out, key_name));
	sprintf(buf, "\033P+q%02x%02x\033\\", key_name[0], key_name[1]);
	out_str_nf((char_u *)buf);
	++xt_index_out;
    }

    // Send the codes out right away.
    if (xt_index_out != old_idx)
	out_flush();
}


get_termcode_len(int idx)
{
    return termcodes[idx].len;
}


report_term_error(char *error_msg, char_u *term)
{
    struct builtin_term *termp;
    int			i;

    mch_errmsg("\r\n");
    if (error_msg != NULL)
    {
	mch_errmsg(error_msg);
	mch_errmsg("\r\n");
    }
    mch_errmsg("'");
    mch_errmsg((char *)term);
    mch_errmsg(_("' not known. Available builtin terminals are:"));
    mch_errmsg("\r\n");
    for (termp = &(builtin_termcaps[0]); termp->bt_string != NULL; ++termp)
    {
	if (termp->bt_entry == (int)KS_NAME
		&& STRCMP(termp->bt_string, "gui") != 0)
	{
#ifdef HAVE_TGETENT
	    mch_errmsg("    builtin_");
#else
	    mch_errmsg("    ");
#endif
	    mch_errmsg(termp->bt_string);
	    mch_errmsg("\r\n");
	}
    }
    // Output extra 'cmdheight' line breaks to avoid that the following error
    // message overwrites the last terminal name.
    for (i = 1; i < p_ch; ++i)
	mch_errmsg("\r\n");
}


check_for_codes_from_term(void)
{
    int		c;

    // If no codes requested or all are answered, no need to wait.
    if (xt_index_out == 0 || xt_index_out == xt_index_in)
	return;

    // Vgetc() will check for and handle any response.
    // Keep calling vpeekc() until we don't get any responses.
    ++no_mapping;
    ++allow_keys;
    for (;;)
    {
	c = vpeekc();
	if (c == NUL)	    // nothing available
	    break;

	// If a response is recognized it's replaced with K_IGNORE, must read
	// it from the input stream.  If there is no K_IGNORE we can't do
	// anything, break here (there might be some responses further on, but
	// we don't want to throw away any typed chars).
	if (c != K_SPECIAL && c != K_IGNORE)
	    break;
	c = vgetc();
	if (c != K_IGNORE)
	{
	    vungetc(c);
	    break;
	}
    }
    --no_mapping;
    --allow_keys;
}


termrequest_sent(termrequest_T *status)
{
    status->tr_progress = STATUS_SENT;
    status->tr_start = time(NULL);
}


out_flush(void)
{
    int	    len;

    if (out_pos != 0)
    {
	// set out_pos to 0 before ui_write, to avoid recursiveness
	len = out_pos;
	out_pos = 0;
	ui_write(out_buf, len, FALSE);
#ifdef FEAT_JOB_CHANNEL
	if (ch_log_output != FALSE)
	{
	    out_buf[len] = NUL;
	    ch_log(NULL, "raw %s output: \"%s\"",
# ifdef FEAT_GUI
			(gui.in_use && !gui.dying && !gui.starting) ? "GUI" :
# endif
			"terminal",
			out_buf);
	    if (ch_log_output == TRUE)
		ch_log_output = FALSE;  // only log once
	}
#endif
    }
}


term_settitle(char_u *title)
{
    MAY_WANT_TO_LOG_THIS;

    // t_ts takes one argument: column in status line
    OUT_STR(tgoto((char *)T_TS, 0, 0));	// set title start
    out_str_nf(title);
    out_str(T_FS);			// set title end
    out_flush();
}


out_flush_check(void)
{
    if (enc_dbcs != 0 && out_pos >= OUT_SIZE - MB_MAXBYTES)
	out_flush();
}


term_get_bg_color(char_u *r, char_u *g, char_u *b)
{
    if (rbg_status.tr_progress == STATUS_GOT)
    {
	*r = bg_r;
	*g = bg_g;
	*b = bg_b;
    }
}


settmode(tmode_T tmode)
{
#ifdef FEAT_GUI
    // don't set the term where gvim was started to any mode
    if (gui.in_use)
	return;
#endif

    if (full_screen)
    {
	/*
	 * When returning after calling a shell cur_tmode is TMODE_UNKNOWN,
	 * set the terminal to raw mode, even though we think it already is,
	 * because the shell program may have reset the terminal mode.
	 * When we think the terminal is normal, don't try to set it to
	 * normal again, because that causes problems (logout!) on some
	 * machines.
	 */
	if (tmode != cur_tmode)
	{
#ifdef FEAT_TERMRESPONSE
# ifdef FEAT_GUI
	    if (!gui.in_use && !gui.starting)
# endif
	    {
		// May need to check for T_CRV response and termcodes, it
		// doesn't work in Cooked mode, an external program may get
		// them.
		if (tmode != TMODE_RAW && termrequest_any_pending())
		    (void)vpeekc_nomap();
		check_for_codes_from_term();
	    }
#endif
	    if (tmode != TMODE_RAW)
		mch_setmouse(FALSE);	// switch mouse off

	    // Disable bracketed paste and modifyOtherKeys in cooked mode.
	    // Avoid doing this too often, on some terminals the codes are not
	    // handled properly.
	    if (termcap_active && tmode != TMODE_SLEEP
						   && cur_tmode != TMODE_SLEEP)
	    {
		MAY_WANT_TO_LOG_THIS;

		if (tmode != TMODE_RAW)
		{
		    out_str(T_BD);	// disable bracketed paste mode
		    out_str(T_CTE);	// possibly disables modifyOtherKeys
		}
		else
		{
		    out_str(T_BE);	// enable bracketed paste mode (should
					// be before mch_settmode().
		    out_str(T_CTI);	// possibly enables modifyOtherKeys
		}
	    }
	    out_flush();
	    mch_settmode(tmode);	// machine specific function
	    cur_tmode = tmode;
	    if (tmode == TMODE_RAW)
		setmouse();		// may switch mouse on
	    out_flush();
	}
#ifdef FEAT_TERMRESPONSE
	may_req_termresponse();
#endif
    }
}


set_color_count(int nr)
{
    char_u	nr_colors[20];		// string for number of colors

    t_colors = nr;
    if (t_colors > 1)
	sprintf((char *)nr_colors, "%d", t_colors);
    else
	*nr_colors = NUL;
    set_string_option_direct((char_u *)"t_Co", -1, nr_colors, OPT_FREE, 0);
}


shell_resized(void)
{
    set_shellsize(0, 0, FALSE);
}


shell_resized_check(void)
{
    int		old_Rows = Rows;
    int		old_Columns = Columns;

    if (!exiting
#ifdef FEAT_GUI
	    // Do not get the size when executing a shell command during
	    // startup.
	    && !gui.starting
#endif
	    )
    {
	(void)ui_get_shellsize();
	check_shellsize();
	if (old_Rows != Rows || old_Columns != Columns)
	    shell_resized();
    }
}


modifiers2keycode(int modifiers, int *key, char_u *string)
{
    int new_slen = 0;

    if (modifiers != 0)
    {
	// Some keys have the modifier included.  Need to handle that here to
	// make mappings work.  This may result in a special key, such as
	// K_S_TAB.
	*key = simplify_key(*key, &modifiers);
	if (modifiers != 0)
	{
	    string[new_slen++] = K_SPECIAL;
	    string[new_slen++] = (int)KS_MODIFIER;
	    string[new_slen++] = modifiers;
	}
    }
    return new_slen;
}


update_tcap(int attr)
{
    struct builtin_term *p;

    p = find_builtin_term(DEFAULT_TERM);
    sprintf(ksme_str, "\033|%dm", attr);
    sprintf(ksmd_str, "\033|%dm", attr | 0x08);  // FOREGROUND_INTENSITY
    sprintf(ksmr_str, "\033|%dm", ((attr & 0x0F) << 4) | ((attr & 0xF0) >> 4));

    while (p->bt_string != NULL)
    {
      if (p->bt_entry == (int)KS_ME)
	  p->bt_string = &ksme_str[0];
      else if (p->bt_entry == (int)KS_MR)
	  p->bt_string = &ksmr_str[0];
      else if (p->bt_entry == (int)KS_MD)
	  p->bt_string = &ksmd_str[0];
      ++p;
    }
}


find_builtin_term(char_u *term)
{
    struct builtin_term *p;

    p = builtin_termcaps;
    while (p->bt_string != NULL)
    {
	if (p->bt_entry == (int)KS_NAME)
	{
#ifdef UNIX
	    if (STRCMP(p->bt_string, "iris-ansi") == 0 && vim_is_iris(term))
		return p;
	    else if (STRCMP(p->bt_string, "xterm") == 0 && vim_is_xterm(term))
		return p;
	    else
#endif
#ifdef VMS
		if (STRCMP(p->bt_string, "vt320") == 0 && vim_is_vt300(term))
		    return p;
		else
#endif
		  if (STRCMP(term, p->bt_string) == 0)
		    return p;
	}
	++p;
    }
    return p;
}


set_mouse_topline(win_T *wp)
{
    orig_topline = wp->w_topline;
# ifdef FEAT_DIFF
    orig_topfill = wp->w_topfill;
# endif
}


term_get_fg_color(char_u *r, char_u *g, char_u *b)
{
    if (rfg_status.tr_progress == STATUS_GOT)
    {
	*r = fg_r;
	*g = fg_g;
	*b = fg_b;
    }
}


switch_to_8bit(void)
{
    int		i;
    int		c;

    // Only need to do something when not already using 8-bit codes.
    if (!term_is_8bit(T_NAME))
    {
	for (i = 0; i < tc_len; ++i)
	{
	    c = term_7to8bit(termcodes[i].code);
	    if (c != 0)
	    {
		STRMOVE(termcodes[i].code + 1, termcodes[i].code + 2);
		termcodes[i].code[0] = c;
	    }
	}
	need_gather = TRUE;		// need to fill termleader[]
    }
    detected_8bit = TRUE;
    LOG_TR(("Switching to 8 bit"));
}


ttest(int pairs)
{
    char_u *env_colors;

    check_options();		    // make sure no options are NULL

    /*
     * MUST have "cm": cursor motion.
     */
    if (*T_CM == NUL)
	emsg(_(e_terminal_capability_cm_required));

    /*
     * if "cs" defined, use a scroll region, it's faster.
     */
    if (*T_CS != NUL)
	scroll_region = TRUE;
    else
	scroll_region = FALSE;

    if (pairs)
    {
	/*
	 * optional pairs
	 */
	// TP goes to normal mode for TI (invert) and TB (bold)
	if (*T_ME == NUL)
	    T_ME = T_MR = T_MD = T_MB = empty_option;
	if (*T_SO == NUL || *T_SE == NUL)
	    T_SO = T_SE = empty_option;
	if (*T_US == NUL || *T_UE == NUL)
	    T_US = T_UE = empty_option;
	if (*T_CZH == NUL || *T_CZR == NUL)
	    T_CZH = T_CZR = empty_option;

	// T_VE is needed even though T_VI is not defined
	if (*T_VE == NUL)
	    T_VI = empty_option;

	// if 'mr' or 'me' is not defined use 'so' and 'se'
	if (*T_ME == NUL)
	{
	    T_ME = T_SE;
	    T_MR = T_SO;
	    T_MD = T_SO;
	}

	// if 'so' or 'se' is not defined use 'mr' and 'me'
	if (*T_SO == NUL)
	{
	    T_SE = T_ME;
	    if (*T_MR == NUL)
		T_SO = T_MD;
	    else
		T_SO = T_MR;
	}

	// if 'ZH' or 'ZR' is not defined use 'mr' and 'me'
	if (*T_CZH == NUL)
	{
	    T_CZR = T_ME;
	    if (*T_MR == NUL)
		T_CZH = T_MD;
	    else
		T_CZH = T_MR;
	}

	// "Sb" and "Sf" come in pairs
	if (*T_CSB == NUL || *T_CSF == NUL)
	{
	    T_CSB = empty_option;
	    T_CSF = empty_option;
	}

	// "AB" and "AF" come in pairs
	if (*T_CAB == NUL || *T_CAF == NUL)
	{
	    T_CAB = empty_option;
	    T_CAF = empty_option;
	}

	// if 'Sb' and 'AB' are not defined, reset "Co"
	if (*T_CSB == NUL && *T_CAB == NUL)
	    free_one_termoption(T_CCO);

	// Set 'weirdinvert' according to value of 't_xs'
	p_wiv = (*T_XS != NUL);
    }
    need_gather = TRUE;

    // Set t_colors to the value of $COLORS or t_Co.  Ignore $COLORS in the
    // GUI.
    t_colors = atoi((char *)T_CCO);
#ifdef FEAT_GUI
    if (!gui.in_use)
#endif
    {
	env_colors = mch_getenv((char_u *)"COLORS");
	if (env_colors != NULL && isdigit(*env_colors))
	{
	    int colors = atoi((char *)env_colors);

	    if (colors != t_colors)
		set_color_count(colors);
	}
    }
}


term_bg_default(void)
{
#if defined(MSWIN)
    // DOS console is nearly always black
    return (char_u *)"dark";
#else
    char_u	*p;

    if (STRCMP(T_NAME, "linux") == 0
	    || STRCMP(T_NAME, "screen.linux") == 0
	    || STRNCMP(T_NAME, "cygwin", 6) == 0
	    || STRNCMP(T_NAME, "putty", 5) == 0
	    || ((p = mch_getenv((char_u *)"COLORFGBG")) != NULL
		&& (p = vim_strrchr(p, ';')) != NULL
		&& ((p[1] >= '0' && p[1] <= '6') || p[1] == '8')
		&& p[2] == NUL))
	return (char_u *)"dark";
    return (char_u *)"light";
#endif
}


show_termcodes(int flags)
{
    int		col;
    int		*items;
    int		item_count;
    int		run;
    int		row, rows;
    int		cols;
    int		i;
    int		len;

#define INC3 27	    // try to make three columns
#define INC2 40	    // try to make two columns
#define GAP 2	    // spaces between columns

    if (tc_len == 0)	    // no terminal codes (must be GUI)
	return;
    items = ALLOC_MULT(int, tc_len);
    if (items == NULL)
	return;

    // Highlight title
    msg_puts_title(_("\n--- Terminal keys ---"));

    /*
     * Do the loop three times:
     * 1. display the short items (non-strings and short strings)
     * 2. display the medium items (medium length strings)
     * 3. display the long items (remaining strings)
     * When "flags" has OPT_ONECOLUMN do everything in 3.
     */
    for (run = (flags & OPT_ONECOLUMN) ? 3 : 1; run <= 3 && !got_int; ++run)
    {
	/*
	 * collect the items in items[]
	 */
	item_count = 0;
	for (i = 0; i < tc_len; i++)
	{
	    len = show_one_termcode(termcodes[i].name,
						    termcodes[i].code, FALSE);
	    if ((flags & OPT_ONECOLUMN) ||
		    (len <= INC3 - GAP ? run == 1
			: len <= INC2 - GAP ? run == 2
			: run == 3))
		items[item_count++] = i;
	}

	/*
	 * display the items
	 */
	if (run <= 2)
	{
	    cols = (Columns + GAP) / (run == 1 ? INC3 : INC2);
	    if (cols == 0)
		cols = 1;
	    rows = (item_count + cols - 1) / cols;
	}
	else	// run == 3
	    rows = item_count;
	for (row = 0; row < rows && !got_int; ++row)
	{
	    msg_putchar('\n');			// go to next line
	    if (got_int)			// 'q' typed in more
		break;
	    col = 0;
	    for (i = row; i < item_count; i += rows)
	    {
		msg_col = col;			// make columns
		show_one_termcode(termcodes[items[i]].name,
					      termcodes[items[i]].code, TRUE);
		if (run == 2)
		    col += INC2;
		else
		    col += INC3;
	    }
	    out_flush();
	    ui_breakcheck();
	}
    }
    vim_free(items);
}


cursor_is_sleeping(void)
{
    return cursor_is_asleep;
}


cursor_unsleep(void)
{
    cursor_is_asleep = FALSE;
    cursor_on();
}


check_terminal_behavior(void)
{
    int	    did_send = FALSE;

    if (!can_get_termresponse() || starting != 0 || *T_U7 == NUL)
	return;

    if (u7_status.tr_progress == STATUS_GET
	    && !option_was_set((char_u *)"ambiwidth"))
    {
	char_u	buf[16];

	// Ambiguous width check.
	// Check how the terminal treats ambiguous character width (UAX #11).
	// First, we move the cursor to (1, 0) and print a test ambiguous
	// character \u25bd (WHITE DOWN-POINTING TRIANGLE) and then query
	// the current cursor position.  If the terminal treats \u25bd as
	// single width, the position is (1, 1), or if it is treated as double
	// width, that will be (1, 2).  This function has the side effect that
	// changes cursor position, so it must be called immediately after
	// entering termcap mode.
	MAY_WANT_TO_LOG_THIS;
	LOG_TR(("Sending request for ambiwidth check"));
	// Do this in the second row.  In the first row the returned sequence
	// may be CSI 1;2R, which is the same as <S-F3>.
	term_windgoto(1, 0);
	buf[mb_char2bytes(0x25bd, buf)] = NUL;
	out_str(buf);
	out_str(T_U7);
	termrequest_sent(&u7_status);
	out_flush();
	did_send = TRUE;

	// This overwrites a few characters on the screen, a redraw is needed
	// after this. Clear them out for now.
	screen_stop_highlight();
	term_windgoto(1, 0);
	out_str((char_u *)"  ");
	line_was_clobbered(1);
    }

    if (xcc_status.tr_progress == STATUS_GET && Rows > 2)
    {
	// 2. Check compatibility with xterm.
	// We move the cursor to (2, 0), print a test sequence and then query
	// the current cursor position.  If the terminal properly handles
	// unknown DCS string and CSI sequence with intermediate byte, the test
	// sequence is ignored and the cursor does not move.  If the terminal
	// handles test sequence incorrectly, a garbage string is displayed and
	// the cursor does move.
	MAY_WANT_TO_LOG_THIS;
	LOG_TR(("Sending xterm compatibility test sequence."));
	// Do this in the third row.  Second row is used by ambiguous
	// character width check.
	term_windgoto(2, 0);
	// send the test DCS string.
	out_str((char_u *)"\033Pzz\033\\");
	// send the test CSI sequence with intermediate byte.
	out_str((char_u *)"\033[0%m");
	out_str(T_U7);
	termrequest_sent(&xcc_status);
	out_flush();
	did_send = TRUE;

	// If the terminal handles test sequence incorrectly, garbage text is
	// displayed. Clear them out for now.
	screen_stop_highlight();
	term_windgoto(2, 0);
	out_str((char_u *)"           ");
	line_was_clobbered(2);
    }

    if (did_send)
    {
	term_windgoto(0, 0);

	// Need to reset the known cursor position.
	screen_start();

	// check for the characters now, otherwise they might be eaten by
	// get_keystroke()
	out_flush();
	(void)vpeekc_nomap();
    }
}


cursor_off(void)
{
    if (full_screen && !cursor_is_off)
    {
	out_str(T_VI);	    // disable cursor
	cursor_is_off = TRUE;
    }
}


show_one_termcode(char_u *name, char_u *code, int printit)
{
    char_u	*p;
    int		len;

    if (name[0] > '~')
    {
	IObuff[0] = ' ';
	IObuff[1] = ' ';
	IObuff[2] = ' ';
	IObuff[3] = ' ';
    }
    else
    {
	IObuff[0] = 't';
	IObuff[1] = '_';
	IObuff[2] = name[0];
	IObuff[3] = name[1];
    }
    IObuff[4] = ' ';

    p = get_special_key_name(TERMCAP2KEY(name[0], name[1]), 0);
    if (p[1] != 't')
	STRCPY(IObuff + 5, p);
    else
	IObuff[5] = NUL;
    len = (int)STRLEN(IObuff);
    do
	IObuff[len++] = ' ';
    while (len < 17);
    IObuff[len] = NUL;
    if (code == NULL)
	len += 4;
    else
	len += vim_strsize(code);

    if (printit)
    {
	msg_puts((char *)IObuff);
	if (code == NULL)
	    msg_puts("NULL");
	else
	    msg_outtrans(code);
    }
    return len;
}


req_codes_from_term(void)
{
    xt_index_out = 0;
    xt_index_in = 0;
    req_more_codes_from_term();
}


out_str_cf(char_u *s)
{
    if (s != NULL && *s)
    {
#ifdef HAVE_TGETENT
	char_u *p;
#endif

#ifdef FEAT_GUI
	// Don't use tputs() when GUI is used, ncurses crashes.
	if (gui.in_use)
	{
	    out_str_nf(s);
	    return;
	}
#endif
	if (out_pos > OUT_SIZE - MAX_ESC_SEQ_LEN)
	    out_flush();
#ifdef HAVE_TGETENT
	for (p = s; *s; ++s)
	{
	    // flush just before delay command
	    if (*s == '$' && *(s + 1) == '<')
	    {
		char_u save_c = *s;
		int duration = atoi((char *)s + 2);

		*s = NUL;
		tputs((char *)p, 1, TPUTSFUNCAST out_char_nf);
		*s = save_c;
		out_flush();
# ifdef ELAPSED_FUNC
		// Only sleep here if we can limit this happening in
		// vim_beep().
		p = vim_strchr(s, '>');
		if (p == NULL || duration <= 0)
		{
		    // can't parse the time, don't sleep here
		    p = s;
		}
		else
		{
		    ++p;
		    do_sleep(duration, FALSE);
		}
# else
		// Rely on the terminal library to sleep.
		p = s;
# endif
		break;
	    }
	}
	tputs((char *)p, 1, TPUTSFUNCAST out_char_nf);
#else
	while (*s)
	    out_char_nf(*s++);
#endif

	// For testing we write one string at a time.
	if (p_wd)
	    out_flush();
    }
}


invoke_tgetent(char_u *tbuf, char_u *term)
{
    int	    i;

    // Note: Valgrind may report a leak here, because the library keeps one
    // buffer around that we can't ever free.
    i = TGETENT(tbuf, term);
    if (i < 0		    // -1 is always an error
# ifdef TGETENT_ZERO_ERR
	    || i == 0	    // sometimes zero is also an error
# endif
       )
    {
	// On FreeBSD tputs() gets a SEGV after a tgetent() which fails.  Call
	// tgetent() with the always existing "dumb" entry to avoid a crash or
	// hang.
	(void)TGETENT(tbuf, "dumb");

	if (i < 0)
# ifdef TGETENT_ZERO_ERR
	    return _(e_cannot_open_termcap_file);
	if (i == 0)
# endif
#ifdef TERMINFO
	    return _(e_terminal_entry_not_found_in_terminfo);
#else
	    return _(e_terminal_entry_not_found_in_termcap);
#endif
    }
    return NULL;
}


term_is_8bit(char_u *name)
{
    return (detected_8bit || strstr((char *)name, "8bit") != NULL);
}


swapping_screen(void)
{
    return (full_screen && *T_TI != NUL);
}


free_cur_term()
{
# ifdef HAVE_DEL_CURTERM
    if (cur_term)
	del_curterm(cur_term);
# endif
}


term_set_winsize(int height, int width)
{
    OUT_STR(tgoto((char *)T_CWS, width, height));
}


log_tr(const char *fmt, ...)
{
    static FILE *fd_tr = NULL;
    static proftime_T start;
    proftime_T now;
    va_list ap;

    if (fd_tr == NULL)
    {
	fd_tr = fopen("termresponse.log", "w");
	profile_start(&start);
    }
    now = start;
    profile_end(&now);
    fprintf(fd_tr, "%s: %s ", profile_msg(&now),
					must_redraw == NOT_VALID ? "NV"
					: must_redraw == CLEAR ? "CL" : "  ");
    va_start(ap, fmt);
    vfprintf(fd_tr, fmt, ap);
    va_end(ap);
    fputc('\n', fd_tr);
    fflush(fd_tr);
}


scroll_region_reset(void)
{
    OUT_STR(tgoto((char *)T_CS, (int)Rows - 1, 0));
    if (*T_CSV != NUL)
	OUT_STR(tgoto((char *)T_CSV, (int)Columns - 1, 0));
    screen_start();		    // don't know where cursor is now
}


handle_csi(
	char_u	*tp,
	int	len,
	char_u	*argp,
	int	offset,
	char_u  *buf,
	int	bufsize,
	int	*buflen,
	char_u	*key_name,
	int	*slen)
{
    int		first = -1;  // optional char right after {lead}
    int		trail;	     // char that ends CSI sequence
    int		arg[3] = {-1, -1, -1};	// argument numbers
    int		argc;			// number of arguments
    char_u	*ap = argp;
    int		csi_len;

    // Check for non-digit after CSI.
    if (!VIM_ISDIGIT(*ap))
	first = *ap++;

    // Find up to three argument numbers.
    for (argc = 0; argc < 3; )
    {
	if (ap >= tp + len)
	    return -1;
	if (*ap == ';')
	    arg[argc++] = -1;  // omitted number
	else if (VIM_ISDIGIT(*ap))
	{
	    arg[argc] = 0;
	    for (;;)
	    {
		if (ap >= tp + len)
		    return -1;
		if (!VIM_ISDIGIT(*ap))
		    break;
		arg[argc] = arg[argc] * 10 + (*ap - '0');
		++ap;
	    }
	    ++argc;
	}
	if (*ap == ';')
	    ++ap;
	else
	    break;
    }

    // mrxvt has been reported to have "+" in the version. Assume
    // the escape sequence ends with a letter or one of "{|}~".
    while (ap < tp + len
	    && !(*ap >= '{' && *ap <= '~')
	    && !ASCII_ISALPHA(*ap))
	++ap;
    if (ap >= tp + len)
	return -1;
    trail = *ap;
    csi_len = (int)(ap - tp) + 1;

    // Cursor position report: Eat it when there are 2 arguments
    // and it ends in 'R'. Also when u7_status is not "sent", it
    // may be from a previous Vim that just exited.  But not for
    // <S-F3>, it sends something similar, check for row and column
    // to make sense.
    if (first == -1 && argc == 2 && trail == 'R')
    {
	handle_u7_response(arg, tp, csi_len);

	key_name[0] = (int)KS_EXTRA;
	key_name[1] = (int)KE_IGNORE;
	*slen = csi_len;
    }

    // Version string: Eat it when there is at least one digit and
    // it ends in 'c'
    else if (*T_CRV != NUL && ap > argp + 1 && trail == 'c')
    {
	handle_version_response(first, arg, argc, tp);

	*slen = csi_len;
# ifdef FEAT_EVAL
	set_vim_var_string(VV_TERMRESPONSE, tp, *slen);
# endif
	apply_autocmds(EVENT_TERMRESPONSE,
					NULL, NULL, FALSE, curbuf);
	key_name[0] = (int)KS_EXTRA;
	key_name[1] = (int)KE_IGNORE;
    }

    // Check blinking cursor from xterm:
    // {lead}?12;1$y       set
    // {lead}?12;2$y       not set
    //
    // {lead} can be <Esc>[ or CSI
    else if (rbm_status.tr_progress == STATUS_SENT
	    && first == '?'
	    && ap == argp + 6
	    && arg[0] == 12
	    && ap[-1] == '$'
	    && trail == 'y')
    {
	initial_cursor_blink = (arg[1] == '1');
	rbm_status.tr_progress = STATUS_GOT;
	LOG_TR(("Received cursor blinking mode response: %s", tp));
	key_name[0] = (int)KS_EXTRA;
	key_name[1] = (int)KE_IGNORE;
	*slen = csi_len;
# ifdef FEAT_EVAL
	set_vim_var_string(VV_TERMBLINKRESP, tp, *slen);
# endif
    }

    // Check for a window position response from the terminal:
    //       {lead}3;{x};{y}t
    else if (did_request_winpos && argc == 3 && arg[0] == 3
						   && trail == 't')
    {
	winpos_x = arg[1];
	winpos_y = arg[2];
	// got finished code: consume it
	key_name[0] = (int)KS_EXTRA;
	key_name[1] = (int)KE_IGNORE;
	*slen = csi_len;

	if (--did_request_winpos <= 0)
	    winpos_status.tr_progress = STATUS_GOT;
    }

    // Key with modifier:
    //	{lead}27;{modifier};{key}~
    //	{lead}{key};{modifier}u
    else if ((arg[0] == 27 && argc == 3 && trail == '~')
	    || (argc == 2 && trail == 'u'))
    {
	return len + handle_key_with_modifier(arg, trail,
			    csi_len, offset, buf, bufsize, buflen);
    }

    // else: Unknown CSI sequence.  We could drop it, but then the
    // user can't create a map for it.
    return 0;
}


out_char(unsigned c)
{
#if defined(UNIX) || defined(VMS) || defined(AMIGA) || defined(MACOS_X)
    if (c == '\n')	// turn LF into CR-LF (CRMOD doesn't seem to do this)
	out_char('\r');
#endif

    out_buf[out_pos++] = c;

    // For testing we flush each time.
    if (out_pos >= OUT_SIZE || p_wd)
	out_flush();
}


term_cursor_right(int i)
{
    OUT_STR(tgoto((char *)T_CRI, 0, i));
}


term_ul_color(int n)
{
    if (*T_CAU)
	term_color(T_CAU, n);
}


scroll_region_set(win_T *wp, int off)
{
    OUT_STR(tgoto((char *)T_CS, W_WINROW(wp) + wp->w_height - 1,
							 W_WINROW(wp) + off));
    if (*T_CSV != NUL && wp->w_width != Columns)
	OUT_STR(tgoto((char *)T_CSV, wp->w_wincol + wp->w_width - 1,
							       wp->w_wincol));
    screen_start();		    // don't know where cursor is now
}


ansi_color2rgb(int nr, char_u *r, char_u *g, char_u *b, char_u *ansi_idx)
{
    if (nr < 16)
    {
	*r = ansi_table[nr][0];
	*g = ansi_table[nr][1];
	*b = ansi_table[nr][2];
	*ansi_idx = nr;
    }
    else
    {
	*r = 0;
	*g = 0;
	*b = 0;
	*ansi_idx = ANSI_INDEX_NONE;
    }
}


init_term_props(int all)
{
    int i;

    term_props[TPR_CURSOR_STYLE].tpr_name = "cursor_style";
    term_props[TPR_CURSOR_STYLE].tpr_set_by_termresponse = FALSE;
    term_props[TPR_CURSOR_BLINK].tpr_name = "cursor_blink_mode";
    term_props[TPR_CURSOR_BLINK].tpr_set_by_termresponse = FALSE;
    term_props[TPR_UNDERLINE_RGB].tpr_name = "underline_rgb";
    term_props[TPR_UNDERLINE_RGB].tpr_set_by_termresponse = TRUE;
    term_props[TPR_MOUSE].tpr_name = "mouse";
    term_props[TPR_MOUSE].tpr_set_by_termresponse = TRUE;

    for (i = 0; i < TPR_COUNT; ++i)
	if (all || term_props[i].tpr_set_by_termresponse)
	    term_props[i].tpr_status = TPR_UNKNOWN;
}


get_bytes_from_buf(char_u *buf, char_u *bytes, int num_bytes)
{
    int	    len = 0;
    int	    i;
    char_u  c;

    for (i = 0; i < num_bytes; i++)
    {
	if ((c = buf[len++]) == NUL)
	    return -1;
	if (c == K_SPECIAL)
	{
	    if (buf[len] == NUL || buf[len + 1] == NUL)	    // cannot happen?
		return -1;
	    if (buf[len++] == (int)KS_ZERO)
		c = NUL;
	    // else it should be KS_SPECIAL; when followed by KE_FILLER c is
	    // K_SPECIAL, or followed by KE_CSI and c must be CSI.
	    if (buf[len++] == (int)KE_CSI)
		c = CSI;
	}
	else if (c == CSI && buf[len] == KS_EXTRA
					       && buf[len + 1] == (int)KE_CSI)
	    // CSI is stored as CSI KS_SPECIAL KE_CSI to avoid confusion with
	    // the start of a special key, see add_to_input_buf_csi().
	    len += 2;
	bytes[i] = c;
    }
    return len;
}


put_string_in_typebuf(
	int	offset,
	int	slen,
	char_u	*string,
	int	new_slen,
	char_u	*buf,
	int	bufsize,
	int	*buflen)
{
    int		extra = new_slen - slen;

    string[new_slen] = NUL;
    if (buf == NULL)
    {
	if (extra < 0)
	    // remove matched chars, taking care of noremap
	    del_typebuf(-extra, offset);
	else if (extra > 0)
	    // insert the extra space we need
	    if (ins_typebuf(string + slen, REMAP_YES, offset, FALSE, FALSE)
								       == FAIL)
		return FAIL;

	// Careful: del_typebuf() and ins_typebuf() may have reallocated
	// typebuf.tb_buf[]!
	mch_memmove(typebuf.tb_buf + typebuf.tb_off + offset, string,
							     (size_t)new_slen);
    }
    else
    {
	if (extra < 0)
	    // remove matched characters
	    mch_memmove(buf + offset, buf + offset - extra,
					   (size_t)(*buflen + offset + extra));
	else if (extra > 0)
	{
	    // Insert the extra space we need.  If there is insufficient
	    // space return -1.
	    if (*buflen + extra + new_slen >= bufsize)
		return FAIL;
	    mch_memmove(buf + offset + extra, buf + offset,
						   (size_t)(*buflen - offset));
	}
	mch_memmove(buf + offset, string, (size_t)new_slen);
	*buflen = *buflen + extra + new_slen;
    }
    return OK;
}


replace_termcodes(
    char_u	*from,
    char_u	**bufp,
    int		flags,
    int		*did_simplify)
{
    int		i;
    int		slen;
    int		key;
    size_t	dlen = 0;
    char_u	*src;
    int		do_backslash;	// backslash is a special character
    int		do_special;	// recognize <> key codes
    int		do_key_code;	// recognize raw key codes
    char_u	*result;	// buffer for resulting string
    garray_T	ga;

    do_backslash = (vim_strchr(p_cpo, CPO_BSLASH) == NULL);
    do_special = (vim_strchr(p_cpo, CPO_SPECI) == NULL)
						  || (flags & REPTERM_SPECIAL);
    do_key_code = (vim_strchr(p_cpo, CPO_KEYCODE) == NULL);
    src = from;

    /*
     * Allocate space for the translation.  Worst case a single character is
     * replaced by 6 bytes (shifted special key), plus a NUL at the end.
     * In the rare case more might be needed ga_grow() must be called again.
     */
    ga_init2(&ga, 1L, 100);
    if (ga_grow(&ga, (int)(STRLEN(src) * 6 + 1)) == FAIL) // out of memory
    {
	*bufp = NULL;
	return from;
    }
    result = ga.ga_data;

    /*
     * Check for #n at start only: function key n
     */
    if ((flags & REPTERM_FROM_PART) && src[0] == '#' && VIM_ISDIGIT(src[1]))
    {
	result[dlen++] = K_SPECIAL;
	result[dlen++] = 'k';
	if (src[1] == '0')
	    result[dlen++] = ';';	// #0 is F10 is "k;"
	else
	    result[dlen++] = src[1];	// #3 is F3 is "k3"
	src += 2;
    }

    /*
     * Copy each byte from *from to result[dlen]
     */
    while (*src != NUL)
    {
	/*
	 * If 'cpoptions' does not contain '<', check for special key codes,
	 * like "<C-S-LeftMouse>"
	 */
	if (do_special && ((flags & REPTERM_DO_LT)
					      || STRNCMP(src, "<lt>", 4) != 0))
	{
#ifdef FEAT_EVAL
	    /*
	     * Change <SID>Func to K_SNR <script-nr> _Func.  This name is used
	     * for script-locla user functions.
	     * (room: 5 * 6 = 30 bytes; needed: 3 + <nr> + 1 <= 14)
	     * Also change <SID>name.Func to K_SNR <import-script-nr> _Func.
	     * Only if "name" is recognized as an import.
	     */
	    if (STRNICMP(src, "<SID>", 5) == 0)
	    {
		if (current_sctx.sc_sid <= 0)
		    emsg(_(e_using_sid_not_in_script_context));
		else
		{
		    char_u  *dot;
		    long    sid = current_sctx.sc_sid;

		    src += 5;
		    if (in_vim9script()
				       && (dot = vim_strchr(src, '.')) != NULL)
		    {
			imported_T *imp = find_imported(src, dot - src, FALSE);

			if (imp != NULL)
			{
			    scriptitem_T    *si = SCRIPT_ITEM(imp->imp_sid);
			    size_t	    len;

			    src = dot + 1;
			    if (si->sn_autoload_prefix != NULL)
			    {
				// Turn "<SID>name.Func"
				// into "scriptname#Func".
				len = STRLEN(si->sn_autoload_prefix);
				if (ga_grow(&ga,
				     (int)(STRLEN(src) * 6 + len + 1)) == FAIL)
				{
				    ga_clear(&ga);
				    *bufp = NULL;
				    return from;
				}
				result = ga.ga_data;
				STRCPY(result + dlen, si->sn_autoload_prefix);
				dlen += len;
				continue;
			    }
			    sid = imp->imp_sid;
			}
		    }

		    result[dlen++] = K_SPECIAL;
		    result[dlen++] = (int)KS_EXTRA;
		    result[dlen++] = (int)KE_SNR;
		    sprintf((char *)result + dlen, "%ld", sid);
		    dlen += STRLEN(result + dlen);
		    result[dlen++] = '_';
		    continue;
		}
	    }
#endif
	    slen = trans_special(&src, result + dlen, FSK_KEYCODE
			  | ((flags & REPTERM_NO_SIMPLIFY) ? 0 : FSK_SIMPLIFY),
							   TRUE, did_simplify);
	    if (slen)
	    {
		dlen += slen;
		continue;
	    }
	}

	/*
	 * If 'cpoptions' does not contain 'k', see if it's an actual key-code.
	 * Note that this is also checked after replacing the <> form.
	 * Single character codes are NOT replaced (e.g. ^H or DEL), because
	 * it could be a character in the file.
	 */
	if (do_key_code)
	{
	    i = find_term_bykeys(src);
	    if (i >= 0)
	    {
		result[dlen++] = K_SPECIAL;
		result[dlen++] = termcodes[i].name[0];
		result[dlen++] = termcodes[i].name[1];
		src += termcodes[i].len;
		// If terminal code matched, continue after it.
		continue;
	    }
	}

#ifdef FEAT_EVAL
	if (do_special)
	{
	    char_u	*p, *s, len;

	    /*
	     * Replace <Leader> by the value of "mapleader".
	     * Replace <LocalLeader> by the value of "maplocalleader".
	     * If "mapleader" or "maplocalleader" isn't set use a backslash.
	     */
	    if (STRNICMP(src, "<Leader>", 8) == 0)
	    {
		len = 8;
		p = get_var_value((char_u *)"g:mapleader");
	    }
	    else if (STRNICMP(src, "<LocalLeader>", 13) == 0)
	    {
		len = 13;
		p = get_var_value((char_u *)"g:maplocalleader");
	    }
	    else
	    {
		len = 0;
		p = NULL;
	    }
	    if (len != 0)
	    {
		// Allow up to 8 * 6 characters for "mapleader".
		if (p == NULL || *p == NUL || STRLEN(p) > 8 * 6)
		    s = (char_u *)"\\";
		else
		    s = p;
		while (*s != NUL)
		    result[dlen++] = *s++;
		src += len;
		continue;
	    }
	}
#endif

	/*
	 * Remove CTRL-V and ignore the next character.
	 * For "from" side the CTRL-V at the end is included, for the "to"
	 * part it is removed.
	 * If 'cpoptions' does not contain 'B', also accept a backslash.
	 */
	key = *src;
	if (key == Ctrl_V || (do_backslash && key == '\\'))
	{
	    ++src;				// skip CTRL-V or backslash
	    if (*src == NUL)
	    {
		if (flags & REPTERM_FROM_PART)
		    result[dlen++] = key;
		break;
	    }
	}

	// skip multibyte char correctly
	for (i = (*mb_ptr2len)(src); i > 0; --i)
	{
	    /*
	     * If the character is K_SPECIAL, replace it with K_SPECIAL
	     * KS_SPECIAL KE_FILLER.
	     * If compiled with the GUI replace CSI with K_CSI.
	     */
	    if (*src == K_SPECIAL)
	    {
		result[dlen++] = K_SPECIAL;
		result[dlen++] = KS_SPECIAL;
		result[dlen++] = KE_FILLER;
	    }
# ifdef FEAT_GUI
	    else if (*src == CSI)
	    {
		result[dlen++] = K_SPECIAL;
		result[dlen++] = KS_EXTRA;
		result[dlen++] = (int)KE_CSI;
	    }
# endif
	    else
		result[dlen++] = *src;
	    ++src;
	}
    }
    result[dlen] = NUL;

    /*
     * Copy the new string to allocated memory.
     * If this fails, just return from.
     */
    if ((*bufp = vim_strsave(result)) != NULL)
	from = *bufp;
    vim_free(result);
    return from;
}


get_long_from_buf(char_u *buf, long_u *val)
{
    int	    len;
    char_u  bytes[sizeof(long_u)];
    int	    i;
    int	    shift;

    *val = 0;
    len = get_bytes_from_buf(buf, bytes, (int)sizeof(long_u));
    if (len != -1)
    {
	for (i = 0; i < (int)sizeof(long_u); i++)
	{
	    shift = 8 * (sizeof(long_u) - 1 - i);
	    *val += (long_u)bytes[i] << shift;
	}
    }
    return len;
}


termrequest_any_pending()
{
    int	    i;
    time_t  now = time(NULL);

    for (i = 0; all_termrequests[i] != NULL; ++i)
    {
	if (all_termrequests[i]->tr_progress == STATUS_SENT)
	{
	    if (all_termrequests[i]->tr_start > 0 && now > 0
				    && all_termrequests[i]->tr_start + 2 < now)
		// Sent the request more than 2 seconds ago and didn't get a
		// response, assume it failed.
		all_termrequests[i]->tr_progress = STATUS_FAIL;
	    else
		return TRUE;
	}
    }
    return FALSE;
}


handle_u7_response(int *arg, char_u *tp UNUSED, int csi_len UNUSED)
{
    if (arg[0] == 2 && arg[1] >= 2)
    {
	char *aw = NULL;

	LOG_TR(("Received U7 status: %s", tp));
	u7_status.tr_progress = STATUS_GOT;
	did_cursorhold = TRUE;
	if (arg[1] == 2)
	    aw = "single";
	else if (arg[1] == 3)
	    aw = "double";
	if (aw != NULL && STRCMP(aw, p_ambw) != 0)
	{
	    // Setting the option causes a screen redraw. Do
	    // that right away if possible, keeping any
	    // messages.
	    set_option_value_give_err((char_u *)"ambw", 0L, (char_u *)aw, 0);
# ifdef DEBUG_TERMRESPONSE
	    {
		int r = redraw_asap(CLEAR);

		log_tr("set 'ambiwidth', redraw_asap(): %d", r);
	    }
# else
	    redraw_asap(CLEAR);
# endif
# ifdef FEAT_EVAL
	    set_vim_var_string(VV_TERMU7RESP, tp, csi_len);
# endif
	}
    }
    else if (arg[0] == 3)
    {
	int value;

	LOG_TR(("Received compatibility test result: %s", tp));
	xcc_status.tr_progress = STATUS_GOT;

	// Third row: xterm compatibility test.
	// If the cursor is on the first column then the terminal can handle
	// the request for cursor style and blinking.
	value = arg[1] == 1 ? TPR_YES : TPR_NO;
	term_props[TPR_CURSOR_STYLE].tpr_status = value;
	term_props[TPR_CURSOR_BLINK].tpr_status = value;
    }
}


del_termcode(char_u *name)
{
    int	    i;

    if (termcodes == NULL)	// nothing there yet
	return;

    need_gather = TRUE;		// need to fill termleader[]

    for (i = 0; i < tc_len; ++i)
	if (termcodes[i].name[0] == name[0] && termcodes[i].name[1] == name[1])
	{
	    del_termcode_idx(i);
	    return;
	}
    // not found. Give error message?
}


term_is_builtin(char_u *name)
{
    return (STRNCMP(name, "builtin_", (size_t)8) == 0);
}


handle_osc(char_u *tp, char_u *argp, int len, char_u *key_name, int *slen)
{
    int		i, j;

    j = 1 + (tp[0] == ESC);
    if (len >= j + 3 && (argp[0] != '1'
			     || (argp[1] != '1' && argp[1] != '0')
			     || argp[2] != ';'))
	i = 0; // no match
    else
	for (i = j; i < len; ++i)
	    if (tp[i] == '\007' || (tp[0] == OSC ? tp[i] == STERM
			: (tp[i] == ESC && i + 1 < len && tp[i + 1] == '\\')))
	    {
		int is_bg = argp[1] == '1';
		int is_4digit = i - j >= 21 && tp[j + 11] == '/'
						  && tp[j + 16] == '/';

		if (i - j >= 15 && STRNCMP(tp + j + 3, "rgb:", 4) == 0
			    && (is_4digit
				   || (tp[j + 9] == '/' && tp[i + 12 == '/'])))
		{
		    char_u *tp_r = tp + j + 7;
		    char_u *tp_g = tp + j + (is_4digit ? 12 : 10);
		    char_u *tp_b = tp + j + (is_4digit ? 17 : 13);
# ifdef FEAT_TERMINAL
		    int rval, gval, bval;

		    rval = hexhex2nr(tp_r);
		    gval = hexhex2nr(tp_b);
		    bval = hexhex2nr(tp_g);
# endif
		    if (is_bg)
		    {
			char *new_bg_val = (3 * '6' < *tp_r + *tp_g +
					     *tp_b) ? "light" : "dark";

			LOG_TR(("Received RBG response: %s", tp));
			rbg_status.tr_progress = STATUS_GOT;
# ifdef FEAT_TERMINAL
			bg_r = rval;
			bg_g = gval;
			bg_b = bval;
# endif
			if (!option_was_set((char_u *)"bg")
				      && STRCMP(p_bg, new_bg_val) != 0)
			{
			    // value differs, apply it
			    set_option_value_give_err((char_u *)"bg",
						  0L, (char_u *)new_bg_val, 0);
			    reset_option_was_set((char_u *)"bg");
			    redraw_asap(CLEAR);
			}
		    }
# ifdef FEAT_TERMINAL
		    else
		    {
			LOG_TR(("Received RFG response: %s", tp));
			rfg_status.tr_progress = STATUS_GOT;
			fg_r = rval;
			fg_g = gval;
			fg_b = bval;
		    }
# endif
		}

		// got finished code: consume it
		key_name[0] = (int)KS_EXTRA;
		key_name[1] = (int)KE_IGNORE;
		*slen = i + 1 + (tp[i] == ESC);
# ifdef FEAT_EVAL
		set_vim_var_string(is_bg ? VV_TERMRBGRESP
						  : VV_TERMRFGRESP, tp, *slen);
# endif
		break;
	    }
    if (i == len)
    {
	LOG_TR(("not enough characters for RB"));
	return FAIL;
    }
    return OK;
}


get_termcode(int i)
{
    if (i >= tc_len)
	return NULL;
    return &termcodes[i].name[0];
}


term_is_gui(char_u *name)
{
    return (STRCMP(name, "builtin_gui") == 0 || STRCMP(name, "gui") == 0);
}


out_str_nf(char_u *s)
{
    // avoid terminal strings being split up
    if (out_pos > OUT_SIZE - MAX_ESC_SEQ_LEN)
	out_flush();

    while (*s)
	out_char_nf(*s++);

    // For testing we write one string at a time.
    if (p_wd)
	out_flush();
}


can_get_termresponse()
{
    return cur_tmode == TMODE_RAW
	    && termcap_active
#  ifdef UNIX
	    && (is_not_a_term() || (isatty(1) && isatty(read_cmd_fd)))
#  endif
	    && p_ek;
}


term_bg_color(int n)
{
    // Use "AB" termcap entry if present, "Sb" entry otherwise
    if (*T_CAB)
	term_color(T_CAB, n);
    else if (*T_CSB)
	term_color(T_CSB, n);
}


term_fg_color(int n)
{
    // Use "AF" termcap entry if present, "Sf" entry otherwise
    if (*T_CAF)
	term_color(T_CAF, n);
    else if (*T_CSF)
	term_color(T_CSF, n);
}


term_cursor_color(char_u *color)
{
    if (*T_CSC != NUL)
    {
	out_str(T_CSC);		// set cursor color start
	out_str_nf(color);
	out_str(T_CEC);		// set cursor color end
	out_flush();
    }
}


term_replace_bs_del_keycode(char_u *ta_buf, int ta_len, int len)
{
    int		i;
    int		c;

    for (i = ta_len; i < ta_len + len; ++i)
    {
	if (ta_buf[i] == CSI && len - i > 2)
	{
	    c = TERMCAP2KEY(ta_buf[i + 1], ta_buf[i + 2]);
	    if (c == K_DEL || c == K_KDEL || c == K_BS)
	    {
		mch_memmove(ta_buf + i + 1, ta_buf + i + 3,
			(size_t)(len - i - 2));
		if (c == K_DEL || c == K_KDEL)
		    ta_buf[i] = DEL;
		else
		    ta_buf[i] = Ctrl_H;
		len -= 2;
	    }
	}
	else if (ta_buf[i] == '\r')
	    ta_buf[i] = '\n';
	if (has_mbyte)
	    i += (*mb_ptr2len_len)(ta_buf + i, ta_len + len - i) - 1;
    }
}


tgoto(char *cm, int x, int y)
{
    static char buf[30];
    char *p, *s, *e;

    if (!cm)
	return "OOPS";
    e = buf + 29;
    for (s = buf; s < e && *cm; cm++)
    {
	if (*cm != '%')
	{
	    *s++ = *cm;
	    continue;
	}
	switch (*++cm)
	{
	case 'd':
	    p = (char *)tltoa((unsigned long)y);
	    y = x;
	    while (*p)
		*s++ = *p++;
	    break;
	case 'i':
	    x++;
	    y++;
	    break;
	case '+':
	    *s++ = (char)(*++cm + y);
	    y = x;
	    break;
	case '%':
	    *s++ = *cm;
	    break;
	default:
	    return "OOPS";
	}
    }
    *s = '\0';
    return buf;
}


term_set_winpos(int x, int y)
{
    // Can't handle a negative value here
    if (x < 0)
	x = 0;
    if (y < 0)
	y = 0;
    OUT_STR(tgoto((char *)T_CWP, y, x));
}


tltoa(unsigned long i)
{
    static char_u buf[16];
    char_u	*p;

    p = buf + 15;
    *p = '\0';
    do
    {
	--p;
	*p = (char_u) (i % 10 + '0');
	i /= 10;
    }
    while (i > 0 && p > buf);
    return p;
}


cursor_sleep(void)
{
    cursor_is_asleep = TRUE;
    cursor_off();
}


termcode_star(char_u *code, int len)
{
    // Shortest is <M-O>*X.  With ; shortest is <CSI>@;*X
    if (len >= 3 && code[len - 2] == '*')
    {
	if (len >= 5 && code[len - 3] == ';')
	    return 2;
	else
	    return 1;
    }
    return 0;
}


may_req_termresponse(void)
{
    if (crv_status.tr_progress == STATUS_GET
	    && can_get_termresponse()
	    && starting == 0
	    && *T_CRV != NUL)
    {
	MAY_WANT_TO_LOG_THIS;
	LOG_TR(("Sending CRV request"));
	out_str(T_CRV);
	termrequest_sent(&crv_status);
	// check for the characters now, otherwise they might be eaten by
	// get_keystroke()
	out_flush();
	(void)vpeekc_nomap();
    }
}


term_get_winpos(int *x, int *y, varnumber_T timeout)
{
    int count = 0;
    int prev_winpos_x = winpos_x;
    int prev_winpos_y = winpos_y;

    if (*T_CGP == NUL || !can_get_termresponse())
	return FAIL;
    winpos_x = -1;
    winpos_y = -1;
    ++did_request_winpos;
    termrequest_sent(&winpos_status);
    OUT_STR(T_CGP);
    out_flush();

    // Try reading the result for "timeout" msec.
    while (count++ <= timeout / 10 && !got_int)
    {
	(void)vpeekc_nomap();
	if (winpos_x >= 0 && winpos_y >= 0)
	{
	    *x = winpos_x;
	    *y = winpos_y;
	    return OK;
	}
	ui_delay(10L, FALSE);
    }
    // Do not reset "did_request_winpos", if we timed out the response might
    // still come later and we must consume it.

    winpos_x = prev_winpos_x;
    winpos_y = prev_winpos_y;
    if (timeout < 10 && prev_winpos_y >= 0 && prev_winpos_x >= 0)
    {
	// Polling: return previous values if we have them.
	*x = winpos_x;
	*y = winpos_y;
	return OK;
    }

    return FALSE;
}


decode_modifiers(int n)
{
    int	    code = n - 1;
    int	    modifiers = 0;

    if (code & 1)
	modifiers |= MOD_MASK_SHIFT;
    if (code & 2)
	modifiers |= MOD_MASK_ALT;
    if (code & 4)
	modifiers |= MOD_MASK_CTRL;
    if (code & 8)
	modifiers |= MOD_MASK_META;
    return modifiers;
}


add_termcap_entry(char_u *name, int force)
{
    char_u  *term;
    int	    key;
    struct builtin_term *termp;
#ifdef HAVE_TGETENT
    char_u  *string;
    int	    i;
    int	    builtin_first;
    char_u  tbuf[TBUFSZ];
    char_u  tstrbuf[TBUFSZ];
    char_u  *tp = tstrbuf;
    char    *error_msg = NULL;
#endif

/*
 * If the GUI is running or will start in a moment, we only support the keys
 * that the GUI can produce.
 */
#ifdef FEAT_GUI
    if (gui.in_use || gui.starting)
	return gui_mch_haskey(name);
#endif

    if (!force && find_termcode(name) != NULL)	    // it's already there
	return OK;

    term = T_NAME;
    if (term == NULL || *term == NUL)	    // 'term' not defined yet
	return FAIL;

    if (term_is_builtin(term))		    // name starts with "builtin_"
    {
	term += 8;
#ifdef HAVE_TGETENT
	builtin_first = TRUE;
#endif
    }
#ifdef HAVE_TGETENT
    else
	builtin_first = p_tbi;
#endif

#ifdef HAVE_TGETENT
/*
 * We can get the entry from the builtin termcap and from the external one.
 * If 'ttybuiltin' is on or the terminal name starts with "builtin_", try
 * builtin termcap first.
 * If 'ttybuiltin' is off, try external termcap first.
 */
    for (i = 0; i < 2; ++i)
    {
	if ((!builtin_first) == i)
#endif
	/*
	 * Search in builtin termcap
	 */
	{
	    termp = find_builtin_term(term);
	    if (termp->bt_string != NULL)	// found it
	    {
		key = TERMCAP2KEY(name[0], name[1]);
		++termp;
		while (termp->bt_entry != (int)KS_NAME)
		{
		    if ((int)termp->bt_entry == key)
		    {
			add_termcode(name, (char_u *)termp->bt_string,
							  term_is_8bit(term));
			return OK;
		    }
		    ++termp;
		}
	    }
	}
#ifdef HAVE_TGETENT
	else
	/*
	 * Search in external termcap
	 */
	{
	    error_msg = invoke_tgetent(tbuf, term);
	    if (error_msg == NULL)
	    {
		string = TGETSTR((char *)name, &tp);
		if (string != NULL && *string != NUL)
		{
		    add_termcode(name, string, FALSE);
		    return OK;
		}
	    }
	}
    }
#endif

    if (SOURCING_NAME == NULL)
    {
#ifdef HAVE_TGETENT
	if (error_msg != NULL)
	    emsg(error_msg);
	else
#endif
	    semsg(_(e_no_str_entry_in_termcap), name);
    }
    return FAIL;
}


term_ul_rgb_color(guicolor_T rgb)
{
# ifdef FEAT_TERMRESPONSE
    if (write_t_8u_state != OK)
	write_t_8u_state = MAYBE;
    else
# endif
	term_rgb_color(T_8U, rgb);
}


term_fg_rgb_color(guicolor_T rgb)
{
    term_rgb_color(T_8F, rgb);
}


find_first_tcap(
    char_u *name,
    int	    code)
{
    struct builtin_term *p;

    for (p = find_builtin_term(name); p->bt_string != NULL; ++p)
	if (p->bt_entry == code)
	    return p;
    return NULL;
}


term_bg_rgb_color(guicolor_T rgb)
{
    if (rgb != INVALCOLOR)
	term_rgb_color(T_8B, rgb);
}


add_termcode(char_u *name, char_u *string, int flags)
{
    struct termcode *new_tc;
    int		    i, j;
    char_u	    *s;
    int		    len;

    if (string == NULL || *string == NUL)
    {
	del_termcode(name);
	return;
    }

#if defined(MSWIN) && !defined(FEAT_GUI)
    s = vim_strnsave(string, STRLEN(string) + 1);
#else
# ifdef VIMDLL
    if (!gui.in_use)
	s = vim_strnsave(string, STRLEN(string) + 1);
    else
# endif
	s = vim_strsave(string);
#endif
    if (s == NULL)
	return;

    // Change leading <Esc>[ to CSI, change <Esc>O to <M-O>.
    if (flags != 0 && flags != ATC_FROM_TERM && term_7to8bit(string) != 0)
    {
	STRMOVE(s, s + 1);
	s[0] = term_7to8bit(string);
    }

#if defined(MSWIN) && (!defined(FEAT_GUI) || defined(VIMDLL))
# ifdef VIMDLL
    if (!gui.in_use)
# endif
    {
	if (s[0] == K_NUL)
	{
	    STRMOVE(s + 1, s);
	    s[1] = 3;
	}
    }
#endif

    len = (int)STRLEN(s);

    need_gather = TRUE;		// need to fill termleader[]

    /*
     * need to make space for more entries
     */
    if (tc_len == tc_max_len)
    {
	tc_max_len += 20;
	new_tc = ALLOC_MULT(struct termcode, tc_max_len);
	if (new_tc == NULL)
	{
	    tc_max_len -= 20;
	    vim_free(s);
	    return;
	}
	for (i = 0; i < tc_len; ++i)
	    new_tc[i] = termcodes[i];
	vim_free(termcodes);
	termcodes = new_tc;
    }

    /*
     * Look for existing entry with the same name, it is replaced.
     * Look for an existing entry that is alphabetical higher, the new entry
     * is inserted in front of it.
     */
    for (i = 0; i < tc_len; ++i)
    {
	if (termcodes[i].name[0] < name[0])
	    continue;
	if (termcodes[i].name[0] == name[0])
	{
	    if (termcodes[i].name[1] < name[1])
		continue;
	    /*
	     * Exact match: May replace old code.
	     */
	    if (termcodes[i].name[1] == name[1])
	    {
		if (flags == ATC_FROM_TERM && (j = termcode_star(
				    termcodes[i].code, termcodes[i].len)) > 0)
		{
		    // Don't replace ESC[123;*X or ESC O*X with another when
		    // invoked from got_code_from_term().
		    if (len == termcodes[i].len - j
			    && STRNCMP(s, termcodes[i].code, len - 1) == 0
			    && s[len - 1]
				   == termcodes[i].code[termcodes[i].len - 1])
		    {
			// They are equal but for the ";*": don't add it.
			vim_free(s);
			return;
		    }
		}
		else
		{
		    // Replace old code.
		    vim_free(termcodes[i].code);
		    --tc_len;
		    break;
		}
	    }
	}
	/*
	 * Found alphabetical larger entry, move rest to insert new entry
	 */
	for (j = tc_len; j > i; --j)
	    termcodes[j] = termcodes[j - 1];
	break;
    }

    termcodes[i].name[0] = name[0];
    termcodes[i].name[1] = name[1];
    termcodes[i].code = s;
    termcodes[i].len = len;

    // For xterm we recognize special codes like "ESC[42;*X" and "ESC O*X" that
    // accept modifiers.
    termcodes[i].modlen = 0;
    j = termcode_star(s, len);
    if (j > 0)
    {
	termcodes[i].modlen = len - 1 - j;
	// For "CSI[@;X" the "@" is not included in "modlen".
	if (termcodes[i].code[termcodes[i].modlen - 1] == '@')
	    --termcodes[i].modlen;
    }
    ++tc_len;
}


termgui_mch_get_rgb(guicolor_T color)
{
    return color;
}


set_termname(char_u *term)
{
    struct builtin_term *termp;
#ifdef HAVE_TGETENT
    int		builtin_first = p_tbi;
    int		try;
    int		termcap_cleared = FALSE;
#endif
    int		width = 0, height = 0;
    char	*error_msg = NULL;
    char_u	*bs_p, *del_p;

    // In silect mode (ex -s) we don't use the 'term' option.
    if (silent_mode)
	return OK;

    detected_8bit = FALSE;		// reset 8-bit detection

    if (term_is_builtin(term))
    {
	term += 8;
#ifdef HAVE_TGETENT
	builtin_first = 1;
#endif
    }

/*
 * If HAVE_TGETENT is not defined, only the builtin termcap is used, otherwise:
 *   If builtin_first is TRUE:
 *     0. try builtin termcap
 *     1. try external termcap
 *     2. if both fail default to a builtin terminal
 *   If builtin_first is FALSE:
 *     1. try external termcap
 *     2. try builtin termcap, if both fail default to a builtin terminal
 */
#ifdef HAVE_TGETENT
    for (try = builtin_first ? 0 : 1; try < 3; ++try)
    {
	/*
	 * Use external termcap
	 */
	if (try == 1)
	{
	    char_u	    tbuf[TBUFSZ];

	    /*
	     * If the external termcap does not have a matching entry, try the
	     * builtin ones.
	     */
	    if ((error_msg = invoke_tgetent(tbuf, term)) == NULL)
	    {
		if (!termcap_cleared)
		{
		    clear_termoptions();	// clear old options
		    termcap_cleared = TRUE;
		}

		get_term_entries(&height, &width);
	    }
	}
	else	    // try == 0 || try == 2
#endif // HAVE_TGETENT
	/*
	 * Use builtin termcap
	 */
	{
#ifdef HAVE_TGETENT
	    /*
	     * If builtin termcap was already used, there is no need to search
	     * for the builtin termcap again, quit now.
	     */
	    if (try == 2 && builtin_first && termcap_cleared)
		break;
#endif
	    /*
	     * search for 'term' in builtin_termcaps[]
	     */
	    termp = find_builtin_term(term);
	    if (termp->bt_string == NULL)	// did not find it
	    {
#ifdef HAVE_TGETENT
		/*
		 * If try == 0, first try the external termcap. If that is not
		 * found we'll get back here with try == 2.
		 * If termcap_cleared is set we used the external termcap,
		 * don't complain about not finding the term in the builtin
		 * termcap.
		 */
		if (try == 0)			// try external one
		    continue;
		if (termcap_cleared)		// found in external termcap
		    break;
#endif
		report_term_error(error_msg, term);

		// when user typed :set term=xxx, quit here
		if (starting != NO_SCREEN)
		{
		    screen_start();	// don't know where cursor is now
		    wait_return(TRUE);
		    return FAIL;
		}
		term = DEFAULT_TERM;
		report_default_term(term);
		set_string_option_direct((char_u *)"term", -1, term,
								 OPT_FREE, 0);
		display_errors();
	    }
	    out_flush();
#ifdef HAVE_TGETENT
	    if (!termcap_cleared)
	    {
#endif
		clear_termoptions();	    // clear old options
#ifdef HAVE_TGETENT
		termcap_cleared = TRUE;
	    }
#endif
	    parse_builtin_tcap(term);
#ifdef FEAT_GUI
	    if (term_is_gui(term))
	    {
		out_flush();
		gui_init();
		// If starting the GUI failed, don't do any of the other
		// things for this terminal
		if (!gui.in_use)
		    return FAIL;
#ifdef HAVE_TGETENT
		break;		// don't try using external termcap
#endif
	    }
#endif // FEAT_GUI
	}
#ifdef HAVE_TGETENT
    }
#endif

/*
 * special: There is no info in the termcap about whether the cursor
 * positioning is relative to the start of the screen or to the start of the
 * scrolling region.  We just guess here. Only msdos pcterm is known to do it
 * relative.
 */
    if (STRCMP(term, "pcterm") == 0)
	T_CCS = (char_u *)"yes";
    else
	T_CCS = empty_option;

#ifdef UNIX
/*
 * Any "stty" settings override the default for t_kb from the termcap.
 * This is in os_unix.c, because it depends a lot on the version of unix that
 * is being used.
 * Don't do this when the GUI is active, it uses "t_kb" and "t_kD" directly.
 */
# ifdef FEAT_GUI
    if (!gui.in_use)
# endif
	get_stty();
#endif

/*
 * If the termcap has no entry for 'bs' and/or 'del' and the ioctl() also
 * didn't work, use the default CTRL-H
 * The default for t_kD is DEL, unless t_kb is DEL.
 * The vim_strsave'd strings are probably lost forever, well it's only two
 * bytes.  Don't do this when the GUI is active, it uses "t_kb" and "t_kD"
 * directly.
 */
#ifdef FEAT_GUI
    if (!gui.in_use)
#endif
    {
	bs_p = find_termcode((char_u *)"kb");
	del_p = find_termcode((char_u *)"kD");
	if (bs_p == NULL || *bs_p == NUL)
	    add_termcode((char_u *)"kb", (bs_p = (char_u *)CTRL_H_STR), FALSE);
	if ((del_p == NULL || *del_p == NUL) &&
					    (bs_p == NULL || *bs_p != DEL))
	    add_termcode((char_u *)"kD", (char_u *)DEL_STR, FALSE);
    }

#if defined(UNIX) || defined(VMS)
    term_is_xterm = vim_is_xterm(term);
#endif
#ifdef FEAT_TERMRESPONSE
    // Reset terminal properties that are set based on the termresponse, which
    // will be sent out soon.
    init_term_props(FALSE);
#endif

#if defined(UNIX) || defined(VMS)
    /*
     * For Unix, set the 'ttymouse' option to the type of mouse to be used.
     * The termcode for the mouse is added as a side effect in option.c.
     */
    {
	char_u	*p = (char_u *)"";

# ifdef FEAT_MOUSE_XTERM
	if (use_xterm_like_mouse(term))
	{
	    if (use_xterm_mouse())
		p = NULL;	// keep existing value, might be "xterm2"
	    else
		p = (char_u *)"xterm";
	}
# endif
	if (p != NULL)
	{
	    set_option_value_give_err((char_u *)"ttym", 0L, p, 0);
	    // Reset the WAS_SET flag, 'ttymouse' can be set to "sgr" or
	    // "xterm2" in check_termcode().
	    reset_option_was_set((char_u *)"ttym");
	}
	if (p == NULL
#  ifdef FEAT_GUI
		|| gui.in_use
#  endif
		)
	    check_mouse_termcode();	// set mouse termcode anyway
    }
#else
    set_mouse_termcode(KS_MOUSE, (char_u *)"\233M");
#endif

#ifdef FEAT_MOUSE_XTERM
    // Focus reporting is supported by xterm compatible terminals and tmux.
    if (use_xterm_like_mouse(term))
    {
	char_u name[3];

	// handle focus in event
	name[0] = KS_EXTRA;
	name[1] = KE_FOCUSGAINED;
	name[2] = NUL;
	add_termcode(name, (char_u *)"\033[I", FALSE);

	// handle focus out event
	name[1] = KE_FOCUSLOST;
	add_termcode(name, (char_u *)"\033[O", FALSE);

	need_gather = TRUE;
    }
#endif
#if (defined(UNIX) || defined(VMS))
    // First time after setting 'term' a focus event is always reported.
    focus_state = MAYBE;
#endif

#ifdef USE_TERM_CONSOLE
    // DEFAULT_TERM indicates that it is the machine console.
    if (STRCMP(term, DEFAULT_TERM) != 0)
	term_console = FALSE;
    else
    {
	term_console = TRUE;
# ifdef AMIGA
	win_resize_on();	// enable window resizing reports
# endif
    }
#endif

#if defined(UNIX) || defined(VMS)
    /*
     * 'ttyfast' is default on for xterm, iris-ansi and a few others.
     */
    if (vim_is_fastterm(term))
	p_tf = TRUE;
#endif
#ifdef USE_TERM_CONSOLE
    /*
     * 'ttyfast' is default on consoles
     */
    if (term_console)
	p_tf = TRUE;
#endif

    ttest(TRUE);	// make sure we have a valid set of terminal codes

    full_screen = TRUE;		// we can use termcap codes from now on
    set_term_defaults();	// use current values as defaults
#ifdef FEAT_TERMRESPONSE
    LOG_TR(("setting crv_status to STATUS_GET"));
    crv_status.tr_progress = STATUS_GET;	// Get terminal version later
    write_t_8u_state = FALSE;
#endif

    /*
     * Initialize the terminal with the appropriate termcap codes.
     * Set the mouse and window title if possible.
     * Don't do this when starting, need to parse the .vimrc first, because it
     * may redefine t_TI etc.
     */
    if (starting != NO_SCREEN)
    {
	starttermcap();		// may change terminal mode
	setmouse();		// may start using the mouse
	maketitle();		// may display window title
    }

	// display initial screen after ttest() checking. jw.
    if (width <= 0 || height <= 0)
    {
	// termcap failed to report size
	// set defaults, in case ui_get_shellsize() also fails
	width = 80;
#if defined(MSWIN)
	height = 25;	    // console is often 25 lines
#else
	height = 24;	    // most terminals are 24 lines
#endif
    }
    set_shellsize(width, height, FALSE);	// may change Rows
    if (starting != NO_SCREEN)
    {
	if (scroll_region)
	    scroll_region_reset();		// In case Rows changed
	check_map_keycodes();	// check mappings for terminal codes used

	{
	    buf_T	*buf;
	    aco_save_T	aco;

	    /*
	     * Execute the TermChanged autocommands for each buffer that is
	     * loaded.
	     */
	    FOR_ALL_BUFFERS(buf)
	    {
		if (curbuf->b_ml.ml_mfp != NULL)
		{
		    aucmd_prepbuf(&aco, buf);
		    apply_autocmds(EVENT_TERMCHANGED, NULL, NULL, FALSE,
								      curbuf);
		    // restore curwin/curbuf and a few other things
		    aucmd_restbuf(&aco);
		}
	    }
	}
    }

#ifdef FEAT_TERMRESPONSE
    may_req_termresponse();
#endif

    return OK;
}


termgui_get_color(char_u *name)
{
    guicolor_T	t;

    if (*name == NUL)
	return INVALCOLOR;
    t = termgui_mch_get_color(name);

    if (t == INVALCOLOR)
	semsg(_(e_cannot_allocate_color_str), name);
    return t;
}


del_termcode_idx(int idx)
{
    int		i;

    vim_free(termcodes[idx].code);
    --tc_len;
    for (i = idx; i < tc_len; ++i)
	termcodes[i] = termcodes[i + 1];
}


scroll_start(void)
{
    if (*T_VS != NUL && *T_CVS != NUL)
    {
	MAY_WANT_TO_LOG_THIS;
	out_str(T_VS);
	out_str(T_CVS);
	screen_start();		// don't know where cursor is now
    }
}


add_long_to_buf(long_u val, char_u *dst)
{
    int	    i;
    int	    shift;

    for (i = 1; i <= (int)sizeof(long_u); i++)
    {
	shift = 8 * (sizeof(long_u) - i);
	dst[i - 1] = (char_u) ((val >> shift) & 0xff);
    }
}


handle_dcs(char_u *tp, char_u *argp, int len, char_u *key_name, int *slen)
{
    int i, j;

    j = 1 + (tp[0] == ESC);
    if (len < j + 3)
	i = len; // need more chars
    else if ((argp[1] != '+' && argp[1] != '$') || argp[2] != 'r')
	i = 0; // no match
    else if (argp[1] == '+')
	// key code response
	for (i = j; i < len; ++i)
	{
	    if ((tp[i] == ESC && i + 1 < len && tp[i + 1] == '\\')
		    || tp[i] == STERM)
	    {
		if (i - j >= 3)
		    got_code_from_term(tp + j, i);
		key_name[0] = (int)KS_EXTRA;
		key_name[1] = (int)KE_IGNORE;
		*slen = i + 1 + (tp[i] == ESC);
		break;
	    }
	}
    else
    {
	// Probably the cursor shape response.  Make sure that "i"
	// is equal to "len" when there are not sufficient
	// characters.
	for (i = j + 3; i < len; ++i)
	{
	    if (i - j == 3 && !isdigit(tp[i]))
		break;
	    if (i - j == 4 && tp[i] != ' ')
		break;
	    if (i - j == 5 && tp[i] != 'q')
		break;
	    if (i - j == 6 && tp[i] != ESC && tp[i] != STERM)
		break;
	    if ((i - j == 6 && tp[i] == STERM)
	     || (i - j == 7 && tp[i] == '\\'))
	    {
		int number = argp[3] - '0';

		// 0, 1 = block blink, 2 = block
		// 3 = underline blink, 4 = underline
		// 5 = vertical bar blink, 6 = vertical bar
		number = number == 0 ? 1 : number;
		initial_cursor_shape = (number + 1) / 2;
		// The blink flag is actually inverted, compared to
		// the value set with T_SH.
		initial_cursor_shape_blink =
				       (number & 1) ? FALSE : TRUE;
		rcs_status.tr_progress = STATUS_GOT;
		LOG_TR(("Received cursor shape response: %s", tp));

		key_name[0] = (int)KS_EXTRA;
		key_name[1] = (int)KE_IGNORE;
		*slen = i + 1;
# ifdef FEAT_EVAL
		set_vim_var_string(VV_TERMSTYLERESP, tp, *slen);
# endif
		break;
	    }
	}
    }

    if (i == len)
    {
	// These codes arrive many together, each code can be
	// truncated at any point.
	LOG_TR(("not enough characters for XT"));
	return FAIL;
    }
    return OK;
}


handle_key_with_modifier(
	int	*arg,
	int	trail,
	int	csi_len,
	int	offset,
	char_u	*buf,
	int	bufsize,
	int	*buflen)
{
    int	    key;
    int	    modifiers;
    int	    new_slen;
    char_u  string[MAX_KEY_CODE_LEN + 1];

    seenModifyOtherKeys = TRUE;
    if (trail == 'u')
	key = arg[0];
    else
	key = arg[2];

    modifiers = decode_modifiers(arg[1]);

    // Some keys need adjustment when the Ctrl modifier is used.
    key = may_adjust_key_for_ctrl(modifiers, key);

    // May remove the shift modifier if it's already included in the key.
    modifiers = may_remove_shift_modifier(modifiers, key);

    // insert modifiers with KS_MODIFIER
    new_slen = modifiers2keycode(modifiers, &key, string);

    if (IS_SPECIAL(key))
    {
	string[new_slen++] = K_SPECIAL;
	string[new_slen++] = KEY2TERMCAP0(key);
	string[new_slen++] = KEY2TERMCAP1(key);
    }
    else if (has_mbyte)
	new_slen += (*mb_char2bytes)(key, string + new_slen);
    else
	string[new_slen++] = key;

    if (put_string_in_typebuf(offset, csi_len, string, new_slen,
						 buf, bufsize, buflen) == FAIL)
	return -1;
    return new_slen - csi_len + offset;
}


term_cursor_mode(int forced)
{
    static int showing_mode = -1;
    char_u *p;

    // Only do something when redrawing the screen and we can restore the
    // mode.
    if (!full_screen || *T_CEI == NUL)
    {
# ifdef FEAT_TERMRESPONSE
	if (forced && initial_cursor_shape > 0)
	    // Restore to initial values.
	    term_cursor_shape(initial_cursor_shape, initial_cursor_blink);
# endif
	return;
    }

    if ((State & MODE_REPLACE) == MODE_REPLACE)
    {
	if (forced || showing_mode != MODE_REPLACE)
	{
	    if (*T_CSR != NUL)
		p = T_CSR;	// Replace mode cursor
	    else
		p = T_CSI;	// fall back to Insert mode cursor
	    if (*p != NUL)
	    {
		out_str(p);
		showing_mode = MODE_REPLACE;
	    }
	}
    }
    else if (State & MODE_INSERT)
    {
	if ((forced || showing_mode != MODE_INSERT) && *T_CSI != NUL)
	{
	    out_str(T_CSI);	    // Insert mode cursor
	    showing_mode = MODE_INSERT;
	}
    }
    else if (forced || showing_mode != MODE_NORMAL)
    {
	out_str(T_CEI);		    // non-Insert mode cursor
	showing_mode = MODE_NORMAL;
    }
}


find_term_bykeys(char_u *src)
{
    int		i;
    int		slen = (int)STRLEN(src);

    for (i = 0; i < tc_len; ++i)
    {
	if (slen == termcodes[i].len
			&& STRNCMP(termcodes[i].code, src, (size_t)slen) == 0)
	    return i;
    }
    return -1;
}


f_terminalprops(typval_T *argvars UNUSED, typval_T *rettv)
{
# ifdef FEAT_TERMRESPONSE
    int i;
# endif

    if (rettv_dict_alloc(rettv) == FAIL)
	return;
# ifdef FEAT_TERMRESPONSE
    for (i = 0; i < TPR_COUNT; ++i)
    {
	char_u	value[2];

	value[0] = term_props[i].tpr_status;
	value[1] = NUL;
	dict_add_string(rettv->vval.v_dict, term_props[i].tpr_name, value);
    }
# endif
}


term_cursor_shape(int shape, int blink)
{
    if (*T_CSH != NUL)
    {
	OUT_STR(tgoto((char *)T_CSH, 0, shape * 2 - blink));
	out_flush();
    }
    else
    {
	int do_blink = blink;

	// t_SH is empty: try setting just the blink state.
	// The blink flags are XORed together, if the initial blinking from
	// style and shape differs, we need to invert the flag here.
	if (blink_state_is_inverted())
	    do_blink = !blink;

	if (do_blink && *T_VS != NUL)
	{
	    out_str(T_VS);
	    out_flush();
	}
	else if (!do_blink && *T_CVS != NUL)
	{
	    out_str(T_CVS);
	    out_flush();
	}
    }
}


blink_state_is_inverted()
{
#ifdef FEAT_TERMRESPONSE
    return rbm_status.tr_progress == STATUS_GOT
	&& rcs_status.tr_progress == STATUS_GOT
		&& initial_cursor_blink != initial_cursor_shape_blink;
#else
    return FALSE;
#endif
}


term_delete_lines(int line_count)
{
    OUT_STR(tgoto((char *)T_CDL, 0, line_count));
}


term_color(char_u *s, int n)
{
    char	buf[20];
    int		i = *s == CSI ? 1 : 2;
		// index in s[] just after <Esc>[ or CSI

    // Special handling of 16 colors, because termcap can't handle it
    // Also accept "\e[3%dm" for TERMINFO, it is sometimes used
    // Also accept CSI instead of <Esc>[
    if (n >= 8 && t_colors >= 16
	      && ((s[0] == ESC && s[1] == '[')
#if defined(FEAT_VTP) && defined(FEAT_TERMGUICOLORS)
		  || (s[0] == ESC && s[1] == '|')
#endif
		  || (s[0] == CSI && (i = 1) == 1))
	      && s[i] != NUL
	      && (STRCMP(s + i + 1, "%p1%dm") == 0
		  || STRCMP(s + i + 1, "%dm") == 0)
	      && (s[i] == '3' || s[i] == '4'))
    {
#ifdef TERMINFO
	char *format = "%s%s%%p1%%dm";
#else
	char *format = "%s%s%%dm";
#endif
	char *lead = i == 2 ? (
#if defined(FEAT_VTP) && defined(FEAT_TERMGUICOLORS)
		    s[1] == '|' ? "\033|" :
#endif
		    "\033[") : "\233";
	char *tail = s[i] == '3' ? (n >= 16 ? "38;5;" : "9")
				 : (n >= 16 ? "48;5;" : "10");

	sprintf(buf, format, lead, tail);
	OUT_STR(tgoto(buf, 0, n >= 16 ? n : n - 8));
    }
    else
	OUT_STR(tgoto((char *)s, 0, n));
}


termgui_mch_get_color(char_u *name)
{
    return gui_get_color_cmn(name);
}


set_shellsize(int width, int height, int mustset)
{
    static int		busy = FALSE;

    /*
     * Avoid recursiveness, can happen when setting the window size causes
     * another window-changed signal.
     */
    if (busy)
	return;

    if (width < 0 || height < 0)    // just checking...
	return;

    if (State == MODE_HITRETURN || State == MODE_SETWSIZE)
    {
	// postpone the resizing
	State = MODE_SETWSIZE;
	return;
    }

    if (updating_screen)
	// resizing while in update_screen() may cause a crash
	return;

    // curwin->w_buffer can be NULL when we are closing a window and the
    // buffer (or window) has already been closed and removing a scrollbar
    // causes a resize event. Don't resize then, it will happen after entering
    // another buffer.
    if (curwin->w_buffer == NULL || curwin->w_lines == NULL)
	return;

    ++busy;

#ifdef AMIGA
    out_flush();	    // must do this before mch_get_shellsize() for
			    // some obscure reason
#endif

    if (mustset || (ui_get_shellsize() == FAIL && height != 0))
    {
	Rows = height;
	Columns = width;
	check_shellsize();
	ui_set_shellsize(mustset);
    }
    else
	check_shellsize();

    // The window layout used to be adjusted here, but it now happens in
    // screenalloc() (also invoked from screenclear()).  That is because the
    // "busy" check above may skip this, but not screenalloc().

    if (State != MODE_ASKMORE && State != MODE_EXTERNCMD
						      && State != MODE_CONFIRM)
	screenclear();
    else
	screen_start();	    // don't know where cursor is now

    if (starting != NO_SCREEN)
    {
	maketitle();

	changed_line_abv_curs();
	invalidate_botline();

	/*
	 * We only redraw when it's needed:
	 * - While at the more prompt or executing an external command, don't
	 *   redraw, but position the cursor.
	 * - While editing the command line, only redraw that.
	 * - in Ex mode, don't redraw anything.
	 * - Otherwise, redraw right now, and position the cursor.
	 * Always need to call update_screen() or screenalloc(), to make
	 * sure Rows/Columns and the size of ScreenLines[] is correct!
	 */
	if (State == MODE_ASKMORE || State == MODE_EXTERNCMD
				     || State == MODE_CONFIRM || exmode_active)
	{
	    screenalloc(FALSE);
	    repeat_message();
	}
	else
	{
	    if (curwin->w_p_scb)
		do_check_scrollbind(TRUE);
	    if (State & MODE_CMDLINE)
	    {
		update_screen(NOT_VALID);
		redrawcmdline();
	    }
	    else
	    {
		update_topline();
		if (pum_visible())
		{
		    redraw_later(NOT_VALID);
		    ins_compl_show_pum();
		}
		update_screen(NOT_VALID);
		if (redrawing())
		    setcursor();
	    }
	}
	cursor_on();	    // redrawing may have switched it off
    }
    out_flush();
    --busy;
}


report_default_term(char_u *term)
{
    mch_errmsg(_("defaulting to '"));
    mch_errmsg((char *)term);
    mch_errmsg("'\r\n");
    if (emsg_silent == 0 && !in_assert_fails)
    {
	screen_start();	// don't know where cursor is now
	out_flush();
	if (!is_not_a_term())
	    ui_delay(2007L, TRUE);
    }
}


swap_tcap(void)
{
# ifdef FEAT_TERMGUICOLORS
    static int		init_done = FALSE;
    static cmode_T	curr_mode;
    struct ks_tbl_S	*ks;
    struct builtin_term *bt;
    cmode_T		mode;

    if (!init_done)
    {
	for (ks = ks_tbl; ks->code != (int)KS_NAME; ks++)
	{
	    bt = find_first_tcap(DEFAULT_TERM, ks->code);
	    if (bt != NULL)
	    {
		// Preserve the original value.
		STRNCPY(ks->buf[CMODE_INDEXED], bt->bt_string, KSSIZE);
		STRNCPY(ks->buf[CMODE_RGB], ks->vtp, KSSIZE);
		STRNCPY(ks->buf[CMODE_256COL], ks->vtp2, KSSIZE);

		bt->bt_string = ks->buf[CMODE_INDEXED];
	    }
	}
	init_done = TRUE;
	curr_mode = CMODE_INDEXED;
    }

    if (p_tgc)
	mode = CMODE_RGB;
    else if (t_colors >= 256)
	mode = CMODE_256COL;
    else
	mode = CMODE_INDEXED;

    if (mode == curr_mode)
	return;

    for (ks = ks_tbl; ks->code != (int)KS_NAME; ks++)
    {
	bt = find_first_tcap(DEFAULT_TERM, ks->code);
	if (bt != NULL)
	    bt->bt_string = ks->buf[mode];
    }

    curr_mode = mode;
# endif
}


getlinecol(
    long	*cp,	// pointer to columns
    long	*rp)	// pointer to rows
{
    char_u	tbuf[TBUFSZ];

    if (T_NAME != NULL && *T_NAME != NUL && invoke_tgetent(tbuf, T_NAME) == NULL)
    {
	if (*cp == 0)
	    *cp = tgetnum("co");
	if (*rp == 0)
	    *rp = tgetnum("li");
    }
}


starttermcap(void)
{
    if (full_screen && !termcap_active)
    {
	MAY_WANT_TO_LOG_THIS;

	out_str(T_TI);			// start termcap mode
	out_str(T_CTI);			// start "raw" mode
	out_str(T_KS);			// start "keypad transmit" mode
	out_str(T_BE);			// enable bracketed paste mode

#if defined(UNIX) || defined(VMS)
	// Enable xterm's focus reporting mode when 'esckeys' is set.
	if (p_ek && *T_FE != NUL)
	    out_str(T_FE);
#endif

	out_flush();
	termcap_active = TRUE;
	screen_start();			// don't know where cursor is now
#ifdef FEAT_TERMRESPONSE
# ifdef FEAT_GUI
	if (!gui.in_use && !gui.starting)
# endif
	{
	    may_req_termresponse();
	    // Immediately check for a response.  If t_Co changes, we don't
	    // want to redraw with wrong colors first.
	    if (crv_status.tr_progress == STATUS_SENT)
		check_for_codes_from_term();
	}
#endif
    }
}


got_code_from_term(char_u *code, int len)
{
#define XT_LEN 100
    char_u	name[3];
    char_u	str[XT_LEN];
    int		i;
    int		j = 0;
    int		c;

    // A '1' means the code is supported, a '0' means it isn't.
    // When half the length is > XT_LEN we can't use it.
    // Our names are currently all 2 characters.
    if (code[0] == '1' && code[7] == '=' && len / 2 < XT_LEN)
    {
	// Get the name from the response and find it in the table.
	name[0] = hexhex2nr(code + 3);
	name[1] = hexhex2nr(code + 5);
	name[2] = NUL;
	for (i = 0; key_names[i] != NULL; ++i)
	{
	    if (STRCMP(key_names[i], name) == 0)
	    {
		xt_index_in = i;
		break;
	    }
	}

	LOG_TR(("Received XT %d: %s", xt_index_in, (char *)name));

	if (key_names[i] != NULL)
	{
	    for (i = 8; (c = hexhex2nr(code + i)) >= 0; i += 2)
		str[j++] = c;
	    str[j] = NUL;
	    if (name[0] == 'C' && name[1] == 'o')
	    {
		// Color count is not a key code.
		may_adjust_color_count(atoi((char *)str));
	    }
	    else
	    {
		// First delete any existing entry with the same code.
		i = find_term_bykeys(str);
		if (i >= 0)
		    del_termcode_idx(i);
		add_termcode(name, str, ATC_FROM_TERM);
	    }
	}
    }

    // May request more codes now that we received one.
    ++xt_index_in;
    req_more_codes_from_term();
}


out_flush_cursor(
    int	    force UNUSED,   // when TRUE, update cursor even when not moved
    int	    clear_selection UNUSED) // clear selection under cursor
{
    mch_disable_flush();
    out_flush();
    mch_enable_flush();
#ifdef FEAT_GUI
    if (gui.in_use)
    {
	gui_update_cursor(force, clear_selection);
	gui_may_flush();
    }
#endif
}


cursor_on_force(void)
{
    out_str(T_VE);
    cursor_is_off = FALSE;
    cursor_is_asleep = FALSE;
}


handle_version_response(int first, int *arg, int argc, char_u *tp)
{
    // The xterm version.  It is set to zero when it can't be an actual xterm
    // version.
    int version = arg[1];

    LOG_TR(("Received CRV response: %s", tp));
    crv_status.tr_progress = STATUS_GOT;
    did_cursorhold = TRUE;

    // Reset terminal properties that are set based on the termresponse.
    // Mainly useful for tests that send the termresponse multiple times.
    // For testing all props can be reset.
    init_term_props(
#ifdef FEAT_EVAL
	    reset_term_props_on_termresponse
#else
	    FALSE
#endif
	    );

    // If this code starts with CSI, you can bet that the
    // terminal uses 8-bit codes.
    if (tp[0] == CSI)
	switch_to_8bit();

    // Screen sends 40500.
    // rxvt sends its version number: "20703" is 2.7.3.
    // Ignore it for when the user has set 'term' to xterm,
    // even though it's an rxvt.
    if (version > 20000)
	version = 0;

    // Figure out more if the response is CSI > 99 ; 99 ; 99 c
    if (first == '>' && argc == 3)
    {
	int need_flush = FALSE;

	// mintty 2.9.5 sends 77;20905;0c.
	// (77 is ASCII 'M' for mintty.)
	if (arg[0] == 77)
	{
	    // mintty can do SGR mouse reporting
	    term_props[TPR_MOUSE].tpr_status = TPR_MOUSE_SGR;
	}

	// If xterm version >= 141 try to get termcap codes.  For other
	// terminals the request should be ignored.
	if (version >= 141 && p_xtermcodes)
	{
	    LOG_TR(("Enable checking for XT codes"));
	    check_for_codes = TRUE;
	    need_gather = TRUE;
	    req_codes_from_term();
	}

	// libvterm sends 0;100;0
	if (version == 100 && arg[0] == 0 && arg[2] == 0)
	{
	    // If run from Vim $COLORS is set to the number of
	    // colors the terminal supports.  Otherwise assume
	    // 256, libvterm supports even more.
	    if (mch_getenv((char_u *)"COLORS") == NULL)
		may_adjust_color_count(256);
	    // Libvterm can handle SGR mouse reporting.
	    term_props[TPR_MOUSE].tpr_status = TPR_MOUSE_SGR;
	}

	if (version == 95)
	{
	    // Mac Terminal.app sends 1;95;0
	    if (arg[0] == 1 && arg[2] == 0)
	    {
		term_props[TPR_UNDERLINE_RGB].tpr_status = TPR_YES;
		term_props[TPR_MOUSE].tpr_status = TPR_MOUSE_SGR;
	    }
	    // iTerm2 sends 0;95;0
	    else if (arg[0] == 0 && arg[2] == 0)
	    {
		// iTerm2 can do SGR mouse reporting
		term_props[TPR_MOUSE].tpr_status = TPR_MOUSE_SGR;
	    }
	    // old iTerm2 sends 0;95;
	    else if (arg[0] == 0 && arg[2] == -1)
		term_props[TPR_UNDERLINE_RGB].tpr_status = TPR_YES;
	}

	// screen sends 83;40500;0 83 is 'S' in ASCII.
	if (arg[0] == 83)
	{
	    // screen supports SGR mouse codes since 4.7.0
	    if (arg[1] >= 40700)
		term_props[TPR_MOUSE].tpr_status = TPR_MOUSE_SGR;
	    else
		term_props[TPR_MOUSE].tpr_status = TPR_MOUSE_XTERM;
	}

	// If no recognized terminal has set mouse behavior, assume xterm.
	if (term_props[TPR_MOUSE].tpr_status == TPR_UNKNOWN)
	{
	    // Xterm version 277 supports SGR.
	    // Xterm version >= 95 supports mouse dragging.
	    if (version >= 277)
		term_props[TPR_MOUSE].tpr_status = TPR_MOUSE_SGR;
	    else if (version >= 95)
		term_props[TPR_MOUSE].tpr_status = TPR_MOUSE_XTERM2;
	}

	// Detect terminals that set $TERM to something like
	// "xterm-256color" but are not fully xterm compatible.
	//
	// Gnome terminal sends 1;3801;0, 1;4402;0 or 1;2501;0.
	// Newer Gnome-terminal sends 65;6001;1.
	// xfce4-terminal sends 1;2802;0.
	// screen sends 83;40500;0
	// Assuming any version number over 2500 is not an
	// xterm (without the limit for rxvt and screen).
	if (arg[1] >= 2500)
	    term_props[TPR_UNDERLINE_RGB].tpr_status = TPR_YES;

	else if (version == 136 && arg[2] == 0)
	{
	    term_props[TPR_UNDERLINE_RGB].tpr_status = TPR_YES;

	    // PuTTY sends 0;136;0
	    if (arg[0] == 0)
	    {
		// supports sgr-like mouse reporting.
		term_props[TPR_MOUSE].tpr_status = TPR_MOUSE_SGR;
	    }
	    // vandyke SecureCRT sends 1;136;0
	}

	// Konsole sends 0;115;0 - but t_u8 does not actually work, therefore
	// commented out.
	// else if (version == 115 && arg[0] == 0 && arg[2] == 0)
	//     term_props[TPR_UNDERLINE_RGB].tpr_status = TPR_YES;

	// GNU screen sends 83;30600;0, 83;40500;0, etc.
	// 30600/40500 is a version number of GNU screen. DA2 support is added
	// on 3.6.  DCS string has a special meaning to GNU screen, but xterm
	// compatibility checking does not detect GNU screen.
	if (arg[0] == 83 && arg[1] >= 30600)
	{
	    term_props[TPR_CURSOR_STYLE].tpr_status = TPR_NO;
	    term_props[TPR_CURSOR_BLINK].tpr_status = TPR_NO;
	}

	// Xterm first responded to this request at patch level
	// 95, so assume anything below 95 is not xterm and hopefully supports
	// the underline RGB color sequence.
	if (version < 95)
	    term_props[TPR_UNDERLINE_RGB].tpr_status = TPR_YES;

	// Getting the cursor style is only supported properly by xterm since
	// version 279 (otherwise it returns 0x18).
	if (version < 279)
	    term_props[TPR_CURSOR_STYLE].tpr_status = TPR_NO;

	/*
	 * Take action on the detected properties.
	 */

	// Unless the underline RGB color is expected to work, disable "t_8u".
	// It does not work for the real Xterm, it resets the background color.
	// This may cause some flicker.  Alternative would be to set "t_8u"
	// here if the terminal is expected to support it, but that might
	// conflict with what was set in the .vimrc.
	if (term_props[TPR_UNDERLINE_RGB].tpr_status != TPR_YES
			&& *T_8U != NUL
			&& !option_was_set((char_u *)"t_8u"))
	{
	    set_string_option_direct((char_u *)"t_8u", -1, (char_u *)"",
								  OPT_FREE, 0);
	}
	if (*T_8U != NUL && write_t_8u_state == MAYBE)
	    // Did skip writing t_8u, a complete redraw is needed.
	    redraw_later_clear();
	write_t_8u_state = OK;  // can output t_8u now

	// Only set 'ttymouse' automatically if it was not set
	// by the user already.
	if (!option_was_set((char_u *)"ttym")
		&& (term_props[TPR_MOUSE].tpr_status == TPR_MOUSE_XTERM2
		    || term_props[TPR_MOUSE].tpr_status == TPR_MOUSE_SGR))
	{
	    set_option_value_give_err((char_u *)"ttym", 0L,
		    term_props[TPR_MOUSE].tpr_status == TPR_MOUSE_SGR
				    ? (char_u *)"sgr" : (char_u *)"xterm2", 0);
	}

	// Only request the cursor style if t_SH and t_RS are
	// set. Only supported properly by xterm since version
	// 279 (otherwise it returns 0x18).
	// Only when getting the cursor style was detected to work.
	// Not for Terminal.app, it can't handle t_RS, it
	// echoes the characters to the screen.
	if (rcs_status.tr_progress == STATUS_GET
		&& term_props[TPR_CURSOR_STYLE].tpr_status == TPR_YES
		&& *T_CSH != NUL
		&& *T_CRS != NUL)
	{
	    MAY_WANT_TO_LOG_THIS;
	    LOG_TR(("Sending cursor style request"));
	    out_str(T_CRS);
	    termrequest_sent(&rcs_status);
	    need_flush = TRUE;
	}

	// Only request the cursor blink mode if t_RC set. Not
	// for Gnome terminal, it can't handle t_RC, it
	// echoes the characters to the screen.
	// Only when getting the cursor style was detected to work.
	if (rbm_status.tr_progress == STATUS_GET
		&& term_props[TPR_CURSOR_BLINK].tpr_status == TPR_YES
		&& *T_CRC != NUL)
	{
	    MAY_WANT_TO_LOG_THIS;
	    LOG_TR(("Sending cursor blink mode request"));
	    out_str(T_CRC);
	    termrequest_sent(&rbm_status);
	    need_flush = TRUE;
	}

	if (need_flush)
	    out_flush();
    }
}


win_new_shellsize(void)
{
    static int	old_Rows = 0;
    static int	old_Columns = 0;

    if (old_Rows != Rows || old_Columns != Columns)
	ui_new_shellsize();
    if (old_Rows != Rows)
    {
	// If 'window' uses the whole screen, keep it using that.
	// Don't change it when set with "-w size" on the command line.
	if (p_window == old_Rows - 1
		    || (old_Rows == 0 && !option_was_set((char_u *)"window")))
	    p_window = Rows - 1;
	old_Rows = Rows;
	shell_new_rows();	// update window sizes
    }
    if (old_Columns != Columns)
    {
	old_Columns = Columns;
	shell_new_columns();	// update window sizes
    }
}