void
tty_cmd_cell(struct tty *tty, const struct tty_ctx *ctx)
{
	struct window_pane	*wp = ctx->wp;
	struct screen		*s = wp->screen;
	u_int			 cx;
	u_int			 width;
	const struct grid_cell	*gc = ctx->cell;
	const struct grid_utf8	*gu = ctx->utf8;

	if (gc->flags & GRID_FLAG_UTF8)
		width = gu->width;
	else
		width = 1;

	tty_region_pane(tty, ctx, ctx->orupper, ctx->orlower);

	/* Is the cursor in the very last position? */
	if (ctx->ocx > wp->sx - width) {
		if (wp->xoff != 0 || wp->sx != tty->sx) {
			/*
			 * The pane doesn't fill the entire line, the linefeed
			 * will already have happened, so just move the cursor.
			 */
			tty_cursor_pane(tty, ctx, 0, ctx->ocy + 1);
		} else if (tty->cx < tty->sx) {
			/*
			 * The cursor isn't in the last position already, so
			 * move as far left as possible and redraw the last
			 * cell to move into the last position.
			 */
			cx = screen_size_x(s) - width;
			tty_cursor_pane(tty, ctx, cx, ctx->ocy);
			tty_cell(tty, &ctx->last_cell, &ctx->last_utf8);
		}
	} else
		tty_cursor_pane(tty, ctx, ctx->ocx, ctx->ocy);

	tty_cell(tty, ctx->cell, ctx->utf8);
}

void
window_copy_cursor_right(struct window_pane *wp)
{
	struct window_copy_mode_data	*data = wp->modedata;
	u_int				 px, py;

	if (data->screen.sel.flag && data->rectflag)
		px = screen_size_x(&data->screen);
	else {
		py = screen_hsize(&wp->base) + data->cy - data->oy;
		px = window_copy_find_length(wp, py);
	}

	if (data->cx >= px) {
		window_copy_cursor_start_of_line(wp);
		window_copy_cursor_down(wp, 0);
	} else {
		window_copy_update_cursor(wp, data->cx + 1, data->cy);
		if (window_copy_update_selection(wp))
			window_copy_redraw_lines(wp, data->cy, 1);
	}
}

/*
 * UTF-8 wide characters are a bit of an annoyance. They take up more than one
 * cell on the screen, so following cells must not be drawn by marking them as
 * padding.
 *
 * So far, so good. The problem is, when overwriting a padding cell, or a UTF-8
 * character, it is necessary to also overwrite any other cells which covered
 * by the same character.
 */
void
screen_write_overwrite(struct screen_write_ctx *ctx, u_int width)
{
	struct screen		*s = ctx->s;
	struct grid		*gd = s->grid;
	const struct grid_cell	*gc;
	u_int			 xx;

	gc = grid_view_peek_cell(gd, s->cx, s->cy);
	if (gc->flags & GRID_FLAG_PADDING) {
		/*
		 * A padding cell, so clear any following and leading padding
		 * cells back to the character. Don't overwrite the current
		 * cell as that happens later anyway.
		 */
		xx = s->cx + 1;
		while (--xx > 0) {
			gc = grid_view_peek_cell(gd, xx, s->cy);
			if (!(gc->flags & GRID_FLAG_PADDING))
				break;
			grid_view_set_cell(gd, xx, s->cy, &grid_default_cell);
		}

		/* Overwrite the character at the start of this padding. */
		grid_view_set_cell(gd, xx, s->cy, &grid_default_cell);
	}

	/*
	 * Overwrite any padding cells that belong to a UTF-8 character
	 * we'll be overwriting with the current character.
	 */
	xx = s->cx + width - 1;
	while (++xx < screen_size_x(s)) {
		gc = grid_view_peek_cell(gd, xx, s->cy);
		if (!(gc->flags & GRID_FLAG_PADDING))
			break;
		grid_view_set_cell(gd, xx, s->cy, &grid_default_cell);
	}
}

/* Resize screen. */
void
screen_resize(struct screen *s, u_int sx, u_int sy)
{
	if (sx < 1)
		sx = 1;
	if (sy < 1)
		sy = 1;

	if (sx != screen_size_x(s)) {
		screen_resize_x(s, sx);

		/*
		 * It is unclear what should happen to tabs on resize. xterm
		 * seems to try and maintain them, rxvt resets them. Resetting
		 * is simpler and more reliable so let's do that.
		 */
		screen_reset_tabs(s);
	}

	if (sy != screen_size_y(s))
		screen_resize_y(s, sy);
}

void
tty_cmd_linefeed(struct tty *tty, const struct tty_ctx *ctx)
{
	struct window_pane	*wp = ctx->wp;
	struct screen		*s = wp->screen;

	if (ctx->ocy != ctx->orlower)
		return;

	if (!tty_pane_full_width(tty, ctx) ||
	    !tty_term_has(tty->term, TTYC_CSR)) {
		if (tty_large_region(tty, ctx))
			wp->flags |= PANE_REDRAW;
		else if (tty_use_rect(tty)) {
			tty_cra_pane (tty, ctx, ctx->orupper + 1, 0,
			    ctx->orlower, screen_size_x(s) - 1,
			    ctx->orupper, 0);
			tty_cmd_clearline(tty, ctx);
		} else
			tty_redraw_region(tty, ctx);
		return;
	}

	/*
	 * If this line wrapped naturally (ctx->num is nonzero), don't do
	 * anything - the cursor can just be moved to the last cell and wrap
	 * naturally.
	 */
	if (ctx->num && !(tty->term->flags & TERM_EARLYWRAP))
		return;

	tty_reset(tty);

	tty_region_pane(tty, ctx, ctx->orupper, ctx->orlower);
	tty_cursor_pane(tty, ctx, ctx->ocx, ctx->ocy);

	tty_putc(tty, '\n');
}

/* Clear to start of screen. */
void
screen_write_clearstartofscreen(struct screen_write_ctx *ctx)
{
	struct screen	*s = ctx->s;
	struct tty_ctx	 ttyctx;
	u_int		 sx = screen_size_x(s);

	screen_write_initctx(ctx, &ttyctx);

	if (s->cy > 0) {
		screen_dirty_clear(s, 0, 0, sx - 1, s->cy);
		grid_view_clear(s->grid, 0, 0, sx, s->cy, 8);
	}
	if (s->cx > sx - 1) {
		screen_dirty_clear(s, 0, s->cy, sx - 1, s->cy);
		grid_view_clear(s->grid, 0, s->cy, sx, 1, 8);
	} else {
		screen_dirty_clear(s, 0, s->cy, s->cx, s->cy);
		grid_view_clear(s->grid, 0, s->cy, s->cx + 1, 1, 8);
	}

	tty_write(tty_cmd_clearstartofscreen, &ttyctx);
}

/* Clear to end of screen from cursor. */
void
screen_write_clearendofscreen(struct screen_write_ctx *ctx)
{
	struct screen	*s = ctx->s;
	struct tty_ctx	 ttyctx;
	u_int		 sx, sy;

	screen_write_initctx(ctx, &ttyctx, 0);

	sx = screen_size_x(s);
	sy = screen_size_y(s);

	/* Scroll into history if it is enabled and clearing entire screen. */
	if (s->cy == 0 && s->grid->flags & GRID_HISTORY)
		grid_view_clear_history(s->grid);
	else {
		if (s->cx <= sx - 1)
			grid_view_clear(s->grid, s->cx, s->cy, sx - s->cx, 1);
		grid_view_clear(s->grid, 0, s->cy + 1, sx, sy - (s->cy + 1));
	}

	tty_write(tty_cmd_clearendofscreen, &ttyctx);
}

struct screen *
window_more_init(struct window_pane *wp)
{
	struct window_more_mode_data	*data;
	struct screen			*s;
	int				 keys;

	wp->modedata = data = xmalloc(sizeof *data);
	ARRAY_INIT(&data->list);
	data->top = 0;

	s = &data->screen;
	screen_init(s, screen_size_x(&wp->base), screen_size_y(&wp->base), 0);
	s->mode &= ~MODE_CURSOR;

	keys = options_get_number(&wp->window->options, "mode-keys");
	if (keys == MODEKEY_EMACS)
		mode_key_init(&data->mdata, &mode_key_tree_emacs_choice);
	else
		mode_key_init(&data->mdata, &mode_key_tree_vi_choice);

	return (s);
}

/* Cursor up by ny. */
void
screen_write_cursorup(struct screen_write_ctx *ctx, u_int ny)
{
	struct screen	*s = ctx->s;

	if (ny == 0)
		ny = 1;

	if (s->cy < s->rupper) {
		/* Above region. */
		if (ny > s->cy)
			ny = s->cy;
	} else {
		/* Below region. */
		if (ny > s->cy - s->rupper)
			ny = s->cy - s->rupper;
	}
	if (s->cx == screen_size_x(s))
	    s->cx--;
	if (ny == 0)
		return;

	s->cy -= ny;
}

/* Cursor down by ny. */
void
screen_write_cursordown(struct screen_write_ctx *ctx, u_int ny)
{
	struct screen	*s = ctx->s;

	if (ny == 0)
		ny = 1;

	if (s->cy > s->rlower) {
		/* Below region. */
		if (ny > screen_size_y(s) - 1 - s->cy)
			ny = screen_size_y(s) - 1 - s->cy;
	} else {
		/* Above region. */
		if (ny > s->rlower - s->cy)
			ny = s->rlower - s->cy;
	}
	if (s->cx == screen_size_x(s))
	    s->cx--;
	if (ny == 0)
		return;

	s->cy += ny;
}

//.........这里部分代码省略.........
		default:
			log_debug("%s: unknown '%c'", __func__, ictx->ch);
			break;
		}
		break;
	case INPUT_CSI_SCP:
		memcpy(&ictx->old_cell, &ictx->cell, sizeof ictx->old_cell);
		ictx->old_cx = s->cx;
		ictx->old_cy = s->cy;
		break;
	case INPUT_CSI_SGR:
		input_csi_dispatch_sgr(ictx);
		break;
	case INPUT_CSI_SM:
		switch (input_get(ictx, 0, 0, -1)) {
		case 4:		/* IRM */
			screen_write_mode_set(&ictx->ctx, MODE_INSERT);
			break;
		default:
			log_debug("%s: unknown '%c'", __func__, ictx->ch);
			break;
		}
		break;
	case INPUT_CSI_SM_PRIVATE:
		switch (input_get(ictx, 0, 0, -1)) {
		case 1:		/* GATM */
			screen_write_mode_set(&ictx->ctx, MODE_KCURSOR);
			break;
		case 3:		/* DECCOLM */
			screen_write_cursormove(&ictx->ctx, 0, 0);
			screen_write_clearscreen(&ictx->ctx);
			break;
		case 7:		/* DECAWM */
			screen_write_mode_set(&ictx->ctx, MODE_WRAP);
			break;
		case 25:	/* TCEM */
			screen_write_mode_set(&ictx->ctx, MODE_CURSOR);
			break;
		case 1000:
			screen_write_mode_clear(&ictx->ctx, ALL_MOUSE_MODES);
			screen_write_mode_set(&ictx->ctx, MODE_MOUSE_STANDARD);
			break;
		case 1002:
			screen_write_mode_clear(&ictx->ctx, ALL_MOUSE_MODES);
			screen_write_mode_set(&ictx->ctx, MODE_MOUSE_BUTTON);
			break;
		case 1003:
			screen_write_mode_clear(&ictx->ctx, ALL_MOUSE_MODES);
			screen_write_mode_set(&ictx->ctx, MODE_MOUSE_ANY);
			break;
		case 1004:
			wp->focus_notify |= PANE_FOCUS_NOTIFY;
			break;
		case 1005:
			screen_write_mode_set(&ictx->ctx, MODE_MOUSE_UTF8);
			break;
		case 1006:
			screen_write_mode_set(&ictx->ctx, MODE_MOUSE_SGR);
			break;
		case 47:
		case 1047:
			window_pane_alternate_on(wp, &ictx->cell, 0);
			break;
		case 1049:
			window_pane_alternate_on(wp, &ictx->cell, 1);
			break;
		case 2004:
			screen_write_mode_set(&ictx->ctx, MODE_BRACKETPASTE);
			break;
		default:
			log_debug("%s: unknown '%c'", __func__, ictx->ch);
			break;
		}
		break;
	case INPUT_CSI_TBC:
		switch (input_get(ictx, 0, 0, 0)) {
		case 0:
			if (s->cx < screen_size_x(s))
				bit_clear(s->tabs, s->cx);
			break;
		case 3:
			bit_nclear(s->tabs, 0, screen_size_x(s) - 1);
			break;
		default:
			log_debug("%s: unknown '%c'", __func__, ictx->ch);
			break;
		}
		break;
	case INPUT_CSI_VPA:
		n = input_get(ictx, 0, 1, 1);
		screen_write_cursormove(sctx, s->cx, n - 1);
		break;
	case INPUT_CSI_DECSCUSR:
		n = input_get(ictx, 0, 0, 0);
		screen_set_cursor_style(s, n);
		break;
	}

	return (0);
}

/* Write cell data. */
void
screen_write_cell(struct screen_write_ctx *ctx, const struct grid_cell *gc)
{
	struct screen		*s = ctx->s;
	struct grid		*gd = s->grid;
	struct tty_ctx		 ttyctx;
	u_int		 	 width, xx, last;
	u_int			 sx = screen_size_x(s), sy = screen_size_y(s);
	struct grid_line	*gl;
	struct grid_cell 	 tmp_gc, now_gc;
	struct grid_cell_entry	*gce;
	int			 insert, skip, selected, wrapped = 0;

	ctx->cells++;

	/* Ignore padding. */
	if (gc->flags & GRID_FLAG_PADDING)
		return;
	width = gc->data.width;

	/*
	 * If this is a wide character and there is no room on the screen, for
	 * the entire character, don't print it.
	 */
	if (!(s->mode & MODE_WRAP) && (width > 1 &&
	    (width > sx || (s->cx != sx && s->cx > sx - width))))
		return;

	/*
	 * If the width is zero, combine onto the previous character, if
	 * there is space.
	 */
	if (width == 0) {
		if (screen_write_combine(ctx, &gc->data) == 0) {
			screen_write_initctx(ctx, &ttyctx);
			tty_write(tty_cmd_utf8character, &ttyctx);
		}
		return;
	}

	/* Initialise the redraw context. */
	screen_write_initctx(ctx, &ttyctx);

	/* If in insert mode, make space for the cells. */
	if (s->mode & MODE_INSERT) {
		if (s->cx <= sx - width) {
			screen_write_flush(ctx);
			xx = sx - s->cx - width;
			grid_view_insert_cells(s->grid, s->cx, s->cy, xx, 8);
		}
		insert = 1;
	} else
		insert = 0;
	skip = !insert;

	/* Check this will fit on the current line and wrap if not. */
	if ((s->mode & MODE_WRAP) && s->cx > sx - width) {
		screen_write_flush(ctx);
		screen_write_save_last(ctx, &ttyctx);
		screen_write_linefeed(ctx, 1);
		s->cx = 0;	/* carriage return */
		skip = 0;
		wrapped = 1;
	}

	/* Sanity check cursor position. */
	if (s->cx > sx - width || s->cy > sy - 1)
		return;

	/* Handle overwriting of UTF-8 characters. */
	gl = &s->grid->linedata[s->grid->hsize + s->cy];
	if (gl->flags & GRID_LINE_EXTENDED) {
		grid_view_get_cell(gd, s->cx, s->cy, &now_gc);
		if (screen_write_overwrite(ctx, &now_gc, width))
			skip = 0;
	}

	/*
	 * If the new character is UTF-8 wide, fill in padding cells. Have
	 * already ensured there is enough room.
	 */
	for (xx = s->cx + 1; xx < s->cx + width; xx++) {
		grid_view_set_cell(gd, xx, s->cy, &screen_write_pad_cell);
		skip = 0;
	}

	/* If no change, do not draw. */
	if (skip) {
		if (s->cx >= gl->cellsize)
			skip = grid_cells_equal(gc, &grid_default_cell);
		else {
			gce = &gl->celldata[s->cx];
			if (gce->flags & GRID_FLAG_EXTENDED)
				skip = 0;
			else if (gc->flags != gce->flags)
				skip = 0;
			else if (gc->attr != gce->data.attr)
				skip = 0;
			else if (gc->fg != gce->data.fg)
//.........这里部分代码省略.........

static char *
cmd_capture_pane_history(struct args *args, struct cmd_q *cmdq,
    struct window_pane *wp, size_t *len)
{
	struct grid		*gd;
	const struct grid_line	*gl;
	struct grid_cell	*gc = NULL;
	int			 n, with_codes, escape_c0, join_lines;
	u_int			 i, sx, top, bottom, tmp;
	char			*cause, *buf, *line;
	const char		*Sflag, *Eflag;
	size_t			 linelen;

	sx = screen_size_x(&wp->base);
	if (args_has(args, 'a')) {
		gd = wp->saved_grid;
		if (gd == NULL) {
			if (!args_has(args, 'q')) {
				cmdq_error(cmdq, "no alternate screen");
				return (NULL);
			}
			return (xstrdup(""));
		}
	} else
		gd = wp->base.grid;

	Sflag = args_get(args, 'S');
	if (Sflag != NULL && strcmp(Sflag, "-") == 0)
		top = 0;
	else {
		n = args_strtonum(args, 'S', INT_MIN, SHRT_MAX, &cause);
		if (cause != NULL) {
			top = gd->hsize;
			free(cause);
		} else if (n < 0 && (u_int) -n > gd->hsize)
			top = 0;
		else
			top = gd->hsize + n;
		if (top > gd->hsize + gd->sy - 1)
			top = gd->hsize + gd->sy - 1;
	}

	Eflag = args_get(args, 'E');
	if (Eflag != NULL && strcmp(Eflag, "-") == 0)
		bottom = gd->hsize + gd->sy - 1;
	else {
		n = args_strtonum(args, 'E', INT_MIN, SHRT_MAX, &cause);
		if (cause != NULL) {
			bottom = gd->hsize + gd->sy - 1;
			free(cause);
		} else if (n < 0 && (u_int) -n > gd->hsize)
			bottom = 0;
		else
			bottom = gd->hsize + n;
		if (bottom > gd->hsize + gd->sy - 1)
			bottom = gd->hsize + gd->sy - 1;
	}

	if (bottom < top) {
		tmp = bottom;
		bottom = top;
		top = tmp;
	}

	with_codes = args_has(args, 'e');
	escape_c0 = args_has(args, 'C');
	join_lines = args_has(args, 'J');

	buf = NULL;
	for (i = top; i <= bottom; i++) {
		line = grid_string_cells(gd, 0, i, sx, &gc, with_codes,
		    escape_c0, !join_lines);
		linelen = strlen(line);

		buf = cmd_capture_pane_append(buf, len, line, linelen);

		gl = grid_peek_line(gd, i);
		if (!join_lines || !(gl->flags & GRID_LINE_WRAPPED))
			buf[(*len)++] = '\n';

		free(line);
	}
	return (buf);
}

void
window_copy_copy_selection(struct window_pane *wp, struct client *c)
{
	struct window_copy_mode_data	*data = wp->modedata;
	struct screen			*s = &data->screen;
	char				*buf;
	size_t				 off;
	u_int				 i, xx, yy, sx, sy, ex, ey, limit;
	u_int				 firstsx, lastex, restex, restsx;

	if (!s->sel.flag)
		return;

	buf = xmalloc(1);
	off = 0;

	*buf = '\0';

	/*
	 * The selection extends from selx,sely to (adjusted) cx,cy on
	 * the base screen.
	 */

	/* Find start and end. */
	xx = data->cx;
	yy = screen_hsize(&wp->base) + data->cy - data->oy;
	if (yy < data->sely || (yy == data->sely && xx < data->selx)) {
		sx = xx; sy = yy;
		ex = data->selx; ey = data->sely;
	} else {
		sx = data->selx; sy = data->sely;
		ex = xx; ey = yy;
	}

	/* Trim ex to end of line. */
	xx = window_copy_find_length(wp, ey);
	if (ex > xx)
		ex = xx;

	/*
	 * Deal with rectangle-copy if necessary; four situations: start of
	 * first line (firstsx), end of last line (lastex), start (restsx) and
	 * end (restex) of all other lines.
	 */
	xx = screen_size_x(s);
	if (data->rectflag) {
		/*
		 * Need to ignore the column with the cursor in it, which for
		 * rectangular copy means knowing which side the cursor is on.
		 */
		if (data->selx < data->cx) {
			/* Selection start is on the left. */
			lastex = data->cx;
			restex = data->cx;
			firstsx = data->selx;
			restsx = data->selx;
		} else {
			/* Cursor is on the left. */
			lastex = data->selx + 1;
			restex = data->selx + 1;
			firstsx = data->cx + 1;
			restsx = data->cx + 1;
		}
	} else {
		/*
		 * Like emacs, keep the top-left-most character, and drop the
		 * bottom-right-most, regardless of copy direction.
		 */
		lastex = ex;
		restex = xx;
		firstsx = sx;
		restsx = 0;
	}

	/* Copy the lines. */
	if (sy == ey)
		window_copy_copy_line(wp, &buf, &off, sy, firstsx, lastex);
	else {
		window_copy_copy_line(wp, &buf, &off, sy, firstsx, restex);
		if (ey - sy > 1) {
			for (i = sy + 1; i < ey; i++) {
				window_copy_copy_line(
				    wp, &buf, &off, i, restsx, restex);
			}
		}
		window_copy_copy_line(wp, &buf, &off, ey, restsx, lastex);
	}

	/* Don't bother if no data. */
	if (off == 0) {
		xfree(buf);
		return;
	}
	off--;	/* remove final \n */

	/* Add the buffer to the stack. */
	limit = options_get_number(&c->session->options, "buffer-limit");
	paste_add(&c->session->buffers, buf, off, limit);
}

void
window_clock_draw_screen(struct window_pane *wp)
{
	struct window_clock_mode_data	*data = wp->modedata;
	struct screen_write_ctx	 	 ctx;
	int				 colour, style;
	struct screen			*s = &data->screen;
	struct grid_cell		 gc;
	char				 tim[64], *ptr;
	time_t				 t;
	struct tm			*tm;
	u_int				 i, j, x, y, idx;

	colour = options_get_number(&wp->window->options, "clock-mode-colour");
	style = options_get_number(&wp->window->options, "clock-mode-style");

	screen_write_start(&ctx, NULL, s);

	t = time(NULL);
	tm = localtime(&t);
	if (style == 0) {
		strftime(tim, sizeof tim, "%l:%M ", localtime(&t));
		if (tm->tm_hour >= 12)
			strlcat(tim, "PM", sizeof tim);
		else
			strlcat(tim, "AM", sizeof tim);
	} else
		strftime(tim, sizeof tim, "%H:%M", tm);

	screen_write_clearscreen(&ctx);

	if (screen_size_x(s) < 6 * strlen(tim) || screen_size_y(s) < 6) {
		if (screen_size_x(s) >= strlen(tim) && screen_size_y(s) != 0) {
			x = (screen_size_x(s) / 2) - (strlen(tim) / 2);
			y = screen_size_y(s) / 2;
			screen_write_cursormove(&ctx, x, y);

			memcpy(&gc, &grid_default_cell, sizeof gc);
			colour_set_fg(&gc, colour);
			screen_write_puts(&ctx, &gc, "%s", tim);
		}


		screen_write_stop(&ctx);
		return;
	}

	x = (screen_size_x(s) / 2) - 3 * strlen(tim);
	y = (screen_size_y(s) / 2) - 3;

	memcpy(&gc, &grid_default_cell, sizeof gc);
	colour_set_bg(&gc, colour);
	for (ptr = tim; *ptr != '\0'; ptr++) {
		if (*ptr >= '0' && *ptr <= '9')
			idx = *ptr - '0';
		else if (*ptr == ':')
			idx = 10;
		else if (*ptr == 'A')
			idx = 11;
		else if (*ptr == 'P')
			idx = 12;
		else if (*ptr == 'M')
			idx = 13;
		else {
			x += 6;
			continue;
		}

		for (j = 0; j < 5; j++) {
			for (i = 0; i < 5; i++) {
				screen_write_cursormove(&ctx, x + i, y + j);
				if (window_clock_table[idx][j][i])
					screen_write_putc(&ctx, &gc, ' ');
			}
		}
		x += 6;
	}

	screen_write_stop(&ctx);
}

void
clock_draw(struct screen_write_ctx *ctx, u_int colour, int style)
{
	struct screen		*s = ctx->s;
	struct grid_cell	 gc;
	char			 tim[64], *ptr;
	time_t			 t;
	u_int			 i, j, x, y, idx;

	t = time(NULL);
	if (style == 0)
		strftime(tim, sizeof tim, "%l:%M %p", localtime(&t));
	else
		strftime(tim, sizeof tim, "%H:%M", localtime(&t));

	screen_write_clearscreen(ctx);
	memcpy(&gc, &grid_default_cell, sizeof gc);
	gc.fg = colour;

	if (screen_size_x(s) < 6 * strlen(tim) || screen_size_y(s) < 6) {
		if (screen_size_x(s) >= strlen(tim) && screen_size_y(s) != 0) {
			x = (screen_size_x(s) / 2) - (strlen(tim) / 2);
			y = screen_size_y(s) / 2;
			screen_write_cursormove(ctx, x, y);

			gc.fg = colour;
			screen_write_puts(ctx, &gc, "%s", tim);
		}
		return;
	}

	x = (screen_size_x(s) / 2) - 3 * strlen(tim);
	y = (screen_size_y(s) / 2) - 3;

	for (ptr = tim; *ptr != '\0'; ptr++) {
		if (*ptr >= '0' && *ptr <= '9')
			idx = *ptr - '0';
 		else if (*ptr == ':')
			idx = 10;
 		else if (*ptr == 'A')
			idx = 11;
 		else if (*ptr == 'P')
			idx = 12;
 		else if (*ptr == 'M')
			idx = 13;
		else {
			x += 6;
			continue;
		}

		for (j = 0; j < 5; j++) {
			screen_write_cursormove(ctx, x, y + j);
			for (i = 0; i < 5; i++) {
				if (clock_table[idx][j][i])
					gc.attr |= GRID_ATTR_REVERSE;
				else
					gc.attr &= ~GRID_ATTR_REVERSE;
				screen_write_putc(ctx, &gc, ' ');
			}
		}
		x += 6;
	}
}

/* Execute escape sequence. */
int
input_esc_dispatch(struct input_ctx *ictx)
{
	struct screen_write_ctx		*sctx = &ictx->ctx;
	struct screen			*s = sctx->s;
	struct input_table_entry	*entry;

	if (ictx->flags & INPUT_DISCARD)
		return (0);
	log_debug("%s: '%c', %s", __func__, ictx->ch, ictx->interm_buf);

	entry = bsearch(ictx, input_esc_table, nitems(input_esc_table),
	    sizeof input_esc_table[0], input_table_compare);
	if (entry == NULL) {
		log_debug("%s: unknown '%c'", __func__, ictx->ch);
		return (0);
	}

	switch (entry->type) {
	case INPUT_ESC_RIS:
		memcpy(&ictx->cell, &grid_default_cell, sizeof ictx->cell);
		memcpy(&ictx->old_cell, &ictx->cell, sizeof ictx->old_cell);
		ictx->old_cx = 0;
		ictx->old_cy = 0;

		screen_write_reset(sctx);
		break;
	case INPUT_ESC_IND:
		screen_write_linefeed(sctx, 0);
		break;
	case INPUT_ESC_NEL:
		screen_write_carriagereturn(sctx);
		screen_write_linefeed(sctx, 0);
		break;
	case INPUT_ESC_HTS:
		if (s->cx < screen_size_x(s))
			bit_set(s->tabs, s->cx);
		break;
	case INPUT_ESC_RI:
		screen_write_reverseindex(sctx);
		break;
	case INPUT_ESC_DECKPAM:
		screen_write_mode_set(sctx, MODE_KKEYPAD);
		break;
	case INPUT_ESC_DECKPNM:
		screen_write_mode_clear(sctx, MODE_KKEYPAD);
		break;
	case INPUT_ESC_DECSC:
		memcpy(&ictx->old_cell, &ictx->cell, sizeof ictx->old_cell);
		ictx->old_cx = s->cx;
		ictx->old_cy = s->cy;
		break;
	case INPUT_ESC_DECRC:
		memcpy(&ictx->cell, &ictx->old_cell, sizeof ictx->cell);
		screen_write_cursormove(sctx, ictx->old_cx, ictx->old_cy);
		break;
	case INPUT_ESC_DECALN:
		screen_write_alignmenttest(sctx);
		break;
	case INPUT_ESC_SCSON_G0:
		/*
		 * Not really supported, but fake it up enough for those that
		 * use it to switch character sets (by redefining G0 to
		 * graphics set, rather than switching to G1).
		 */
		ictx->cell.attr &= ~GRID_ATTR_CHARSET;
		break;
	case INPUT_ESC_SCSOFF_G0:
		ictx->cell.attr |= GRID_ATTR_CHARSET;
		break;
	}

	return (0);
}

/* Execute C0 control sequence. */
int
input_c0_dispatch(struct input_ctx *ictx)
{
	struct screen_write_ctx	*sctx = &ictx->ctx;
	struct window_pane	*wp = ictx->wp;
	struct screen		*s = sctx->s;
	u_int			 trigger;

	log_debug("%s: '%c", __func__, ictx->ch);

	switch (ictx->ch) {
	case '\000':	/* NUL */
		break;
	case '\007':	/* BEL */
		wp->window->flags |= WINDOW_BELL;
		break;
	case '\010':	/* BS */
		screen_write_backspace(sctx);
		goto count_c0;
	case '\011':	/* HT */
		/* Don't tab beyond the end of the line. */
		if (s->cx >= screen_size_x(s) - 1)
			break;

		/* Find the next tab point, or use the last column if none. */
		do {
			s->cx++;
			if (bit_test(s->tabs, s->cx))
				break;
		} while (s->cx < screen_size_x(s) - 1);
		break;
	case '\012':	/* LF */
	case '\013':	/* VT */
	case '\014':	/* FF */
		screen_write_linefeed(sctx, 0);
		goto count_c0;
	case '\015':	/* CR */
		screen_write_carriagereturn(sctx);
		goto count_c0;
	case '\016':	/* SO */
		ictx->cell.attr |= GRID_ATTR_CHARSET;
		break;
	case '\017':	/* SI */
		ictx->cell.attr &= ~GRID_ATTR_CHARSET;
		break;
	default:
		log_debug("%s: unknown '%c'", __func__, ictx->ch);
		break;
	}

	return (0);

count_c0:
	trigger = options_get_number(&wp->window->options, "c0-change-trigger");
	if (++wp->changes == trigger) {
		wp->flags |= PANE_DROP;
		window_pane_timer_start(wp);
	}

	return (0);
}

/* Write cell data. */
void
screen_write_cell(struct screen_write_ctx *ctx, const struct grid_cell *gc)
{
	struct screen		*s = ctx->s;
	struct grid		*gd = s->grid;
	struct tty_ctx		 ttyctx;
	u_int		 	 width, xx, last;
	struct grid_cell 	 tmp_gc, now_gc;
	int			 insert, skip, selected;

	/* Ignore padding. */
	if (gc->flags & GRID_FLAG_PADDING)
		return;
	width = gc->data.width;

	/*
	 * If this is a wide character and there is no room on the screen, for
	 * the entire character, don't print it.
	 */
	if (!(s->mode & MODE_WRAP)
	    && (width > 1 && (width > screen_size_x(s) ||
		(s->cx != screen_size_x(s)
		 && s->cx > screen_size_x(s) - width))))
		return;

	/*
	 * If the width is zero, combine onto the previous character, if
	 * there is space.
	 */
	if (width == 0) {
		if (screen_write_combine(ctx, &gc->data) == 0) {
			screen_write_initctx(ctx, &ttyctx);
			tty_write(tty_cmd_utf8character, &ttyctx);
		}
		return;
	}

	/* Initialise the redraw context. */
	screen_write_initctx(ctx, &ttyctx);

	/* If in insert mode, make space for the cells. */
	if ((s->mode & MODE_INSERT) && s->cx <= screen_size_x(s) - width) {
		xx = screen_size_x(s) - s->cx - width;
		grid_move_cells(s->grid, s->cx + width, s->cx, s->cy, xx);
		insert = 1;
	} else
		insert = 0;
	skip = !insert;

	/* Check this will fit on the current line and wrap if not. */
	if ((s->mode & MODE_WRAP) && s->cx > screen_size_x(s) - width) {
		screen_write_linefeed(ctx, 1);
		s->cx = 0;	/* carriage return */
		skip = 0;
	}

	/* Sanity check cursor position. */
	if (s->cx > screen_size_x(s) - width || s->cy > screen_size_y(s) - 1)
		return;

	/* Handle overwriting of UTF-8 characters. */
	grid_view_get_cell(gd, s->cx, s->cy, &now_gc);
	if (screen_write_overwrite(ctx, &now_gc, width))
		skip = 0;

	/*
	 * If the new character is UTF-8 wide, fill in padding cells. Have
	 * already ensured there is enough room.
	 */
	for (xx = s->cx + 1; xx < s->cx + width; xx++) {
		grid_view_set_cell(gd, xx, s->cy, &screen_write_pad_cell);
		skip = 0;
	}

	/* If no change, do not draw. */
	if (skip)
		skip = (memcmp(&now_gc, gc, sizeof now_gc) == 0);

	/* Update the selection the flag and set the cell. */
	selected = screen_check_selection(s, s->cx, s->cy);
	if (selected && ~gc->flags & GRID_FLAG_SELECTED) {
		skip = 0;
		memcpy(&tmp_gc, gc, sizeof tmp_gc);
		tmp_gc.flags |= GRID_FLAG_SELECTED;
		grid_view_set_cell(gd, s->cx, s->cy, &tmp_gc);
	} else if (!selected && gc->flags & GRID_FLAG_SELECTED) {
		skip = 0;
		memcpy(&tmp_gc, gc, sizeof tmp_gc);
		tmp_gc.flags &= ~GRID_FLAG_SELECTED;
		grid_view_set_cell(gd, s->cx, s->cy, &tmp_gc);
	} else if (!skip)
		grid_view_set_cell(gd, s->cx, s->cy, gc);

	/*
	 * Move the cursor. If not wrapping, stick at the last character and
	 * replace it.
	 */
	last = !(s->mode & MODE_WRAP);
	if (s->cx <= screen_size_x(s) - last - width)
//.........这里部分代码省略.........

/* Execute escape sequence. */
int
input_esc_dispatch(struct input_ctx *ictx)
{
	struct screen_write_ctx		*sctx = &ictx->ctx;
	struct screen			*s = sctx->s;
	struct input_table_entry	*entry;

	if (ictx->flags & INPUT_DISCARD)
		return (0);
	log_debug("%s: '%c', %s", __func__, ictx->ch, ictx->interm_buf);

	entry = bsearch(ictx, input_esc_table, nitems(input_esc_table),
	    sizeof input_esc_table[0], input_table_compare);
	if (entry == NULL) {
		log_debug("%s: unknown '%c'", __func__, ictx->ch);
		return (0);
	}

	switch (entry->type) {
	case INPUT_ESC_RIS:
		input_reset_cell(ictx);
		screen_write_reset(sctx);
		break;
	case INPUT_ESC_IND:
		screen_write_linefeed(sctx, 0);
		break;
	case INPUT_ESC_NEL:
		screen_write_carriagereturn(sctx);
		screen_write_linefeed(sctx, 0);
		break;
	case INPUT_ESC_HTS:
		if (s->cx < screen_size_x(s))
			bit_set(s->tabs, s->cx);
		break;
	case INPUT_ESC_RI:
		screen_write_reverseindex(sctx);
		break;
	case INPUT_ESC_DECKPAM:
		screen_write_mode_set(sctx, MODE_KKEYPAD);
		break;
	case INPUT_ESC_DECKPNM:
		screen_write_mode_clear(sctx, MODE_KKEYPAD);
		break;
	case INPUT_ESC_DECSC:
		memcpy(&ictx->old_cell, &ictx->cell, sizeof ictx->old_cell);
		ictx->old_cx = s->cx;
		ictx->old_cy = s->cy;
		break;
	case INPUT_ESC_DECRC:
		memcpy(&ictx->cell, &ictx->old_cell, sizeof ictx->cell);
		screen_write_cursormove(sctx, ictx->old_cx, ictx->old_cy);
		break;
	case INPUT_ESC_DECALN:
		screen_write_alignmenttest(sctx);
		break;
	case INPUT_ESC_SCSG0_ON:
		ictx->cell.g0set = 1;
		break;
	case INPUT_ESC_SCSG0_OFF:
		ictx->cell.g0set = 0;
		break;
	case INPUT_ESC_SCSG1_ON:
		ictx->cell.g1set = 1;
		break;
	case INPUT_ESC_SCSG1_OFF:
		ictx->cell.g1set = 0;
		break;
	}

	return (0);
}