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Trim some code by moving the ioctl(TIOCGWINSZ) after SIGWINCH from the client
into the server.

This is another (the second of four) protocol version changes coming this
morning, so again the server should be killed before upgrading.

/* $OpenBSD: tty.c,v 1.31 2009/09/23 06:12:58 nicm Exp $ */

/*
 * Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
 * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <sys/types.h>
#include <sys/ioctl.h>

#include <errno.h>
#include <fcntl.h>
#include <string.h>
#include <termios.h>
#include <unistd.h>

#include "tmux.h"

void	tty_fill_acs(struct tty *);

void	tty_raw(struct tty *, const char *);

int	tty_try_256(struct tty *, u_char, const char *);
int	tty_try_88(struct tty *, u_char, const char *);

void	tty_attributes_fg(struct tty *, const struct grid_cell *);
void	tty_attributes_bg(struct tty *, const struct grid_cell *);

void	tty_redraw_region(struct tty *, const struct tty_ctx *);
void	tty_emulate_repeat(
	    struct tty *, enum tty_code_code, enum tty_code_code, u_int);
void	tty_cell(struct tty *,
    	    const struct grid_cell *, const struct grid_utf8 *);

void
tty_init(struct tty *tty, int fd, char *term)
{
	int	 mode;
	char	*path;

	memset(tty, 0, sizeof *tty);
	tty->log_fd = -1;

	if (term == NULL || *term == '\0')
		tty->termname = xstrdup("unknown");
	else
		tty->termname = xstrdup(term);

	if ((mode = fcntl(fd, F_GETFL)) == -1)
		fatal("fcntl failed");
	if (fcntl(fd, F_SETFL, mode|O_NONBLOCK) == -1)
		fatal("fcntl failed");
	if (fcntl(fd, F_SETFD, FD_CLOEXEC) == -1)
		fatal("fcntl failed");
	tty->fd = fd;

	if ((path = ttyname(fd)) == NULL)
		fatalx("ttyname failed");
	tty->path = xstrdup(path);

	tty->flags = 0;
	tty->term_flags = 0;
}

void
tty_resize(struct tty *tty)
{
	struct winsize	ws;

	if (ioctl(tty->fd, TIOCGWINSZ, &ws) != -1) {
		tty->sx = ws.ws_col;
		tty->sy = ws.ws_row;
	}
	if (tty->sx == 0)
		tty->sx = 80;
	if (tty->sy == 0)
		tty->sy = 24;

	tty->cx = UINT_MAX;
	tty->cy = UINT_MAX;

	tty->rupper = UINT_MAX;
	tty->rlower = UINT_MAX;
}

int
tty_open(struct tty *tty, const char *overrides, char **cause)
{
	int	fd;

	if (debug_level > 3) {
		fd = open("tmux.out", O_WRONLY|O_CREAT|O_TRUNC, 0644);
		if (fd != -1 && fcntl(fd, F_SETFD, FD_CLOEXEC) == -1)
			fatal("fcntl failed");
		tty->log_fd = fd;
	}

	tty->term = tty_term_find(tty->termname, tty->fd, overrides, cause);
	if (tty->term == NULL) {
		tty_close(tty);
		return (-1);
	}
	tty->flags |= TTY_OPENED;

	tty->in = buffer_create(BUFSIZ);
	tty->out = buffer_create(BUFSIZ);

	tty->flags &= ~(TTY_NOCURSOR|TTY_FREEZE|TTY_ESCAPE);

	tty_start_tty(tty);

	tty_keys_init(tty);

	tty_fill_acs(tty);

	return (0);
}

void
tty_start_tty(struct tty *tty)
{
	struct termios	 tio;
	int		 what;

#if 0
	tty_detect_utf8(tty);
#endif

	if (tcgetattr(tty->fd, &tty->tio) != 0)
		fatal("tcgetattr failed");
	memcpy(&tio, &tty->tio, sizeof tio);
	tio.c_iflag &= ~(IXON|IXOFF|ICRNL|INLCR|IGNCR|IMAXBEL|ISTRIP);
	tio.c_iflag |= IGNBRK;
	tio.c_oflag &= ~(OPOST|ONLCR|OCRNL|ONLRET);
	tio.c_lflag &= ~(IEXTEN|ICANON|ECHO|ECHOE|ECHONL|ECHOCTL|
	    ECHOPRT|ECHOKE|ECHOCTL|ISIG);
	tio.c_cc[VMIN] = 1;
        tio.c_cc[VTIME] = 0;
	if (tcsetattr(tty->fd, TCSANOW, &tio) != 0)
		fatal("tcsetattr failed");

	what = 0;
	if (ioctl(tty->fd, TIOCFLUSH, &what) != 0)
		fatal("ioctl(TIOCFLUSH)");

	tty_putcode(tty, TTYC_SMCUP);

	tty_putcode(tty, TTYC_SGR0);
	memcpy(&tty->cell, &grid_default_cell, sizeof tty->cell);

	tty_putcode(tty, TTYC_SMKX);
	tty_putcode(tty, TTYC_ENACS);
	tty_putcode(tty, TTYC_CLEAR);

	tty_putcode(tty, TTYC_CNORM);
	if (tty_term_has(tty->term, TTYC_KMOUS))
		tty_puts(tty, "\033[?1000l");

	tty->cx = UINT_MAX;
	tty->cy = UINT_MAX;

	tty->rlower = UINT_MAX;
	tty->rupper = UINT_MAX;

	tty->mode = MODE_CURSOR;

	tty->flags |= TTY_STARTED;
}

void
tty_stop_tty(struct tty *tty)
{
	struct winsize	ws;

	if (!(tty->flags & TTY_STARTED))
		return;
	tty->flags &= ~TTY_STARTED;

	/*
	 * Be flexible about error handling and try not kill the server just
	 * because the fd is invalid. Things like ssh -t can easily leave us
	 * with a dead tty.
	 */
	if (ioctl(tty->fd, TIOCGWINSZ, &ws) == -1)
		return;
	if (tcsetattr(tty->fd, TCSANOW, &tty->tio) == -1)
		return;

	tty_raw(tty, tty_term_string2(tty->term, TTYC_CSR, 0, ws.ws_row - 1));
	tty_raw(tty, tty_term_string(tty->term, TTYC_RMACS));
	tty_raw(tty, tty_term_string(tty->term, TTYC_SGR0));
	tty_raw(tty, tty_term_string(tty->term, TTYC_RMKX));
	tty_raw(tty, tty_term_string(tty->term, TTYC_CLEAR));

	tty_raw(tty, tty_term_string(tty->term, TTYC_CNORM));
	if (tty_term_has(tty->term, TTYC_KMOUS))
		tty_raw(tty, "\033[?1000l");

	tty_raw(tty, tty_term_string(tty->term, TTYC_RMCUP));
}

#if 0
void
tty_detect_utf8(struct tty *tty)
{
	struct pollfd	pfd;
	char	      	buf[7];
	size_t		len;
	ssize_t		n;
	int		nfds;
	struct termios	tio, old_tio;
	int		 what;

	if (tty->flags & TTY_UTF8)
		return;

	/*
	 * If the terminal looks reasonably likely to support this, try to
	 * write a three-byte UTF-8 wide character to the terminal, then read
	 * the cursor position.
	 *
	 * XXX This entire function is a hack.
	 */

	/* Check if the terminal looks sort of vt100. */
	if (strstr(tty_term_string(tty->term, TTYC_CLEAR), "[2J") == NULL ||
	    strstr(tty_term_string(tty->term, TTYC_CUP), "H") == NULL)
		return;

	if (tcgetattr(tty->fd, &old_tio) != 0)
		fatal("tcgetattr failed");
	cfmakeraw(&tio);
	if (tcsetattr(tty->fd, TCSANOW, &tio) != 0)
		fatal("tcsetattr failed");

	what = 0;
	if (ioctl(tty->fd, TIOCFLUSH, &what) != 0)
		fatal("ioctl(TIOCFLUSH)");

#define UTF8_TEST_DATA "\033[H\357\277\246\033[6n"
	if (write(tty->fd, UTF8_TEST_DATA, (sizeof UTF8_TEST_DATA) - 1) == -1)
		fatal("write failed");
#undef UTF8_TEST_DATA

	len = 0;
	for (;;) {
		pfd.fd = tty->fd;
		pfd.events = POLLIN;

		nfds = poll(&pfd, 1, 500);
		if (nfds == -1) {
			if (errno == EAGAIN || errno == EINTR)
				continue;
			fatal("poll failed");
		}
		if (nfds == 0)
			break;
		if (pfd.revents & (POLLERR|POLLNVAL|POLLHUP))
			break;
		if (!(pfd.revents & POLLIN))
			continue;

		if ((n = read(tty->fd, buf + len, 1)) != 1)
			break;
		buf[++len] = '\0';

		if (len == (sizeof buf) - 1) {
			if (strcmp(buf, "\033[1;3R") == 0)
				tty->flags |= TTY_UTF8;
			break;
		}
	}

	if (tcsetattr(tty->fd, TCSANOW, &old_tio) != 0)
		fatal("tcsetattr failed");
}
#endif

void
tty_fill_acs(struct tty *tty)
{
	const char *ptr;

	memset(tty->acs, 0, sizeof tty->acs);
	if (!tty_term_has(tty->term, TTYC_ACSC))
		return;

	ptr = tty_term_string(tty->term, TTYC_ACSC);
	if (strlen(ptr) % 2 != 0)
		return;
	for (; *ptr != '\0'; ptr += 2)
		tty->acs[(u_char) ptr[0]] = ptr[1];
}

u_char
tty_get_acs(struct tty *tty, u_char ch)
{
	if (tty->acs[ch] != '\0')
		return (tty->acs[ch]);
	return (ch);
}

void
tty_close(struct tty *tty)
{
	if (tty->log_fd != -1) {
		close(tty->log_fd);
		tty->log_fd = -1;
	}

	tty_stop_tty(tty);

	if (tty->flags & TTY_OPENED) {
		tty_term_free(tty->term);
		tty_keys_free(tty);

		buffer_destroy(tty->in);
		buffer_destroy(tty->out);

		tty->flags &= ~TTY_OPENED;
	}

	if (tty->fd != -1) {
		close(tty->fd);
		tty->fd = -1;
	}
}

void
tty_free(struct tty *tty)
{
	tty_close(tty);

	if (tty->path != NULL)
		xfree(tty->path);
	if (tty->termname != NULL)
		xfree(tty->termname);
}

void
tty_raw(struct tty *tty, const char *s)
{
	write(tty->fd, s, strlen(s));
}

void
tty_putcode(struct tty *tty, enum tty_code_code code)
{
	tty_puts(tty, tty_term_string(tty->term, code));
}

void
tty_putcode1(struct tty *tty, enum tty_code_code code, int a)
{
	if (a < 0)
		return;
	tty_puts(tty, tty_term_string1(tty->term, code, a));
}

void
tty_putcode2(struct tty *tty, enum tty_code_code code, int a, int b)
{
	if (a < 0 || b < 0)
		return;
	tty_puts(tty, tty_term_string2(tty->term, code, a, b));
}

void
tty_puts(struct tty *tty, const char *s)
{
	if (*s == '\0')
		return;
	buffer_write(tty->out, s, strlen(s));

	if (tty->log_fd != -1)
		write(tty->log_fd, s, strlen(s));
}

void
tty_putc(struct tty *tty, u_char ch)
{
	u_int	sx;

	if (tty->cell.attr & GRID_ATTR_CHARSET)
		ch = tty_get_acs(tty, ch);
	buffer_write8(tty->out, ch);

	if (ch >= 0x20 && ch != 0x7f) {
		sx = tty->sx;
		if (tty->term->flags & TERM_EARLYWRAP)
			sx--;

		if (tty->cx == sx) {
			tty->cx = 0;
			tty->cy++;
		} else
			tty->cx++;
	}

	if (tty->log_fd != -1)
		write(tty->log_fd, &ch, 1);
}

void
tty_pututf8(struct tty *tty, const struct grid_utf8 *gu)
{
	u_int	i, width;

	for (i = 0; i < UTF8_SIZE; i++) {
		if (gu->data[i] == 0xff)
			break;
		buffer_write8(tty->out, gu->data[i]);
		if (tty->log_fd != -1)
			write(tty->log_fd, &gu->data[i], 1);
	}

	width = utf8_width(gu->data);
	tty->cx += width;
}

void
tty_set_title(struct tty *tty, const char *title)
{
	if (strstr(tty->termname, "xterm") == NULL &&
	    strstr(tty->termname, "rxvt") == NULL &&
	    strcmp(tty->termname, "screen") != 0)
		return;

	tty_puts(tty, "\033]0;");
	tty_puts(tty, title);
	tty_putc(tty, '\007');
}

void
tty_update_mode(struct tty *tty, int mode)
{
	int	changed;

	if (tty->flags & TTY_NOCURSOR)
		mode &= ~MODE_CURSOR;

	changed = mode ^ tty->mode;
	if (changed & MODE_CURSOR) {
		if (mode & MODE_CURSOR)
			tty_putcode(tty, TTYC_CNORM);
		else
			tty_putcode(tty, TTYC_CIVIS);
	}
	if (changed & MODE_MOUSE) {
		if (mode & MODE_MOUSE)
			tty_puts(tty, "\033[?1000h");
		else
			tty_puts(tty, "\033[?1000l");
	}
	tty->mode = mode;
}

void
tty_emulate_repeat(
    struct tty *tty, enum tty_code_code code, enum tty_code_code code1, u_int n)
{
	if (tty_term_has(tty->term, code))
		tty_putcode1(tty, code, n);
	else {
		while (n-- > 0)
			tty_putcode(tty, code1);
	}
}

/*
 * Redraw scroll region using data from screen (already updated). Used when
 * CSR not supported, or window is a pane that doesn't take up the full
 * width of the terminal.
 */
void
tty_redraw_region(struct tty *tty, const struct tty_ctx *ctx)
{
	struct window_pane	*wp = ctx->wp;
	struct screen		*s = wp->screen;
	u_int		 	 i;

	/*
	 * If region is >= 50% of the screen, just schedule a window redraw. In
	 * most cases, this is likely to be followed by some more scrolling -
	 * without this, the entire pane ends up being redrawn many times which
	 * can be much more data.
	 */
	if (ctx->orupper - ctx->orlower >= screen_size_y(s) / 2) {
		wp->flags |= PANE_REDRAW;
		return;
	}

	if (ctx->ocy < ctx->orupper || ctx->ocy > ctx->orlower) {
		for (i = ctx->ocy; i < screen_size_y(s); i++)
			tty_draw_line(tty, s, i, wp->xoff, wp->yoff);
	} else {
		for (i = ctx->orupper; i <= ctx->orlower; i++)
			tty_draw_line(tty, s, i, wp->xoff, wp->yoff);
	}
}

void
tty_draw_line(struct tty *tty, struct screen *s, u_int py, u_int ox, u_int oy)
{
	const struct grid_cell	*gc;
	struct grid_cell	 tmpgc;
	const struct grid_utf8	*gu;
	u_int			 i, sx;

	sx = screen_size_x(s);
	if (sx > s->grid->linedata[s->grid->hsize + py].cellsize)
		sx = s->grid->linedata[s->grid->hsize + py].cellsize;
	if (sx > tty->sx)
		sx = tty->sx;

	tty_cursor(tty, 0, py, ox, oy);
	for (i = 0; i < sx; i++) {
		gc = grid_view_peek_cell(s->grid, i, py);

		gu = NULL;
		if (gc->flags & GRID_FLAG_UTF8)
			gu = grid_view_peek_utf8(s->grid, i, py);

		if (screen_check_selection(s, i, py)) {
			memcpy(&tmpgc, &s->sel.cell, sizeof tmpgc);
			tmpgc.data = gc->data;
			tmpgc.flags = gc->flags & ~(GRID_FLAG_FG256|GRID_FLAG_BG256);
			tmpgc.flags |= s->sel.cell.flags & (GRID_FLAG_FG256|GRID_FLAG_BG256);
			tty_cell(tty, &tmpgc, gu);
		} else
			tty_cell(tty, gc, gu);
	}

	if (sx >= tty->sx)
		return;
	tty_reset(tty);

	tty_cursor(tty, sx, py, ox, oy);
	if (screen_size_x(s) >= tty->sx && tty_term_has(tty->term, TTYC_EL))
		tty_putcode(tty, TTYC_EL);
	else {
		for (i = sx; i < screen_size_x(s); i++)
			tty_putc(tty, ' ');
	}
}

void
tty_write(void (*cmdfn)(
    struct tty *, const struct tty_ctx *), const struct tty_ctx *ctx)
{
	struct window_pane	*wp = ctx->wp;
	struct client		*c;
	u_int		 	 i;

	if (wp == NULL)
		return;

	if (wp->window->flags & WINDOW_REDRAW || wp->flags & PANE_REDRAW)
		return;
	if (wp->window->flags & WINDOW_HIDDEN || !window_pane_visible(wp))
		return;

	for (i = 0; i < ARRAY_LENGTH(&clients); i++) {
		c = ARRAY_ITEM(&clients, i);
		if (c == NULL || c->session == NULL)
			continue;
		if (c->flags & CLIENT_SUSPENDED)
			continue;

		if (c->session->curw->window == wp->window) {
			if (c->tty.flags & TTY_FREEZE || c->tty.term == NULL)
				continue;
			tty_update_mode(&c->tty, c->tty.mode & ~MODE_CURSOR);
			cmdfn(&c->tty, ctx);
		}
	}
}

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

	if (wp->xoff != 0 || screen_size_x(s) < tty->sx) {
		tty_draw_line(tty, wp->screen, ctx->ocy, wp->xoff, wp->yoff);
		return;
	}

	tty_reset(tty);

 	tty_cursor(tty, ctx->ocx, ctx->ocy, wp->xoff, wp->yoff);
	if (tty_term_has(tty->term, TTYC_ICH) ||
	    tty_term_has(tty->term, TTYC_ICH1))
		tty_emulate_repeat(tty, TTYC_ICH, TTYC_ICH1, ctx->num);
	else {
		tty_putcode(tty, TTYC_SMIR);
		for (i = 0; i < ctx->num; i++)
			tty_putc(tty, ' ');
		tty_putcode(tty, TTYC_RMIR);
	}
}

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

	if (wp->xoff != 0 || screen_size_x(s) < tty->sx ||
	    (!tty_term_has(tty->term, TTYC_DCH) &&
	    !tty_term_has(tty->term, TTYC_DCH1))) {
		tty_draw_line(tty, wp->screen, ctx->ocy, wp->xoff, wp->yoff);
		return;
	}

	tty_reset(tty);

 	tty_cursor(tty, ctx->ocx, ctx->ocy, wp->xoff, wp->yoff);
	if (tty_term_has(tty->term, TTYC_DCH) ||
	    tty_term_has(tty->term, TTYC_DCH1))
		tty_emulate_repeat(tty, TTYC_DCH, TTYC_DCH1, ctx->num);
}

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

 	if (wp->xoff != 0 || screen_size_x(s) < tty->sx ||
	    !tty_term_has(tty->term, TTYC_CSR)) {
		tty_redraw_region(tty, ctx);
		return;
	}

	tty_reset(tty);

 	tty_region(tty, ctx->orupper, ctx->orlower, wp->yoff);

 	tty_cursor(tty, ctx->ocx, ctx->ocy, wp->xoff, wp->yoff);
	tty_emulate_repeat(tty, TTYC_IL, TTYC_IL1, ctx->num);
}

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

 	if (wp->xoff != 0 || screen_size_x(s) < tty->sx ||
	    !tty_term_has(tty->term, TTYC_CSR)) {
		tty_redraw_region(tty, ctx);
		return;
	}

	tty_reset(tty);

 	tty_region(tty, ctx->orupper, ctx->orlower, wp->yoff);

 	tty_cursor(tty, ctx->ocx, ctx->ocy, wp->xoff, wp->yoff);
	tty_emulate_repeat(tty, TTYC_DL, TTYC_DL1, ctx->num);
}

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

	tty_reset(tty);

 	tty_cursor(tty, 0, ctx->ocy, wp->xoff, wp->yoff);
	if (wp->xoff == 0 && screen_size_x(s) >= tty->sx &&
	    tty_term_has(tty->term, TTYC_EL)) {
		tty_putcode(tty, TTYC_EL);
	} else {
		for (i = 0; i < screen_size_x(s); i++)
			tty_putc(tty, ' ');
	}
}

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

	tty_reset(tty);

	tty_cursor(tty, ctx->ocx, ctx->ocy, wp->xoff, wp->yoff);
	if (wp->xoff == 0 && screen_size_x(s) >= tty->sx &&
	    tty_term_has(tty->term, TTYC_EL))
		tty_putcode(tty, TTYC_EL);
	else {
		for (i = ctx->ocx; i < screen_size_x(s); i++)
			tty_putc(tty, ' ');
	}
}

void
tty_cmd_clearstartofline(struct tty *tty, const struct tty_ctx *ctx)
{
  	struct window_pane	*wp = ctx->wp;
	u_int		 	 i;

	tty_reset(tty);

	if (wp->xoff == 0 && tty_term_has(tty->term, TTYC_EL1)) {
		tty_cursor(tty, ctx->ocx, ctx->ocy, wp->xoff, wp->yoff);
		tty_putcode(tty, TTYC_EL1);
	} else {
		tty_cursor(tty, 0, ctx->ocy, wp->xoff, wp->yoff);
		for (i = 0; i < ctx->ocx + 1; i++)
			tty_putc(tty, ' ');
	}
}

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

 	if (wp->xoff != 0 || screen_size_x(s) < tty->sx ||
	    !tty_term_has(tty->term, TTYC_CSR)) {
		tty_redraw_region(tty, ctx);
		return;
	}

	tty_reset(tty);

 	tty_region(tty, ctx->orupper, ctx->orlower, wp->yoff);

	if (ctx->ocy == ctx->orupper) {
		tty_cursor(tty, ctx->ocx, ctx->orupper, wp->xoff, wp->yoff);
		tty_putcode(tty, TTYC_RI);
	}
}

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

 	if (wp->xoff != 0 || screen_size_x(s) < tty->sx ||
	    !tty_term_has(tty->term, TTYC_CSR)) {
		tty_redraw_region(tty, ctx);
		return;
	}

	tty_reset(tty);

 	tty_region(tty, ctx->orupper, ctx->orlower, wp->yoff);

	if (ctx->ocy == ctx->orlower) {
		tty_cursor(tty, ctx->ocx, ctx->ocy, wp->xoff, wp->yoff);
		tty_putc(tty, '\n');
	}
}

void
tty_cmd_clearendofscreen(struct tty *tty, const struct tty_ctx *ctx)
{
  	struct window_pane	*wp = ctx->wp;
	struct screen		*s = wp->screen;
	u_int		 	 i, j;

	tty_reset(tty);

	tty_region(tty, 0, screen_size_y(s) - 1, wp->yoff);
	tty_cursor(tty, ctx->ocx, ctx->ocy, wp->xoff, wp->yoff);
	if (wp->xoff == 0 && screen_size_x(s) >= tty->sx &&
	    tty_term_has(tty->term, TTYC_EL)) {
		tty_putcode(tty, TTYC_EL);
		if (ctx->ocy != screen_size_y(s) - 1) {
			tty_cursor(tty, 0, ctx->ocy + 1, wp->xoff, wp->yoff);
			for (i = ctx->ocy + 1; i < screen_size_y(s); i++) {
				tty_putcode(tty, TTYC_EL);
				if (i == screen_size_y(s) - 1)
					continue;
				tty_emulate_repeat(tty, TTYC_CUD, TTYC_CUD1, 1);
				tty->cy++;
			}
		}
	} else {
		for (i = ctx->ocx; i < screen_size_x(s); i++)
			tty_putc(tty, ' ');
		for (j = ctx->ocy; j < screen_size_y(s); j++) {
			tty_cursor(tty, 0, j, wp->xoff, wp->yoff);
			for (i = 0; i < screen_size_x(s); i++)
				tty_putc(tty, ' ');
		}
	}
}

void
tty_cmd_clearstartofscreen(struct tty *tty, const struct tty_ctx *ctx)
{
 	struct window_pane	*wp = ctx->wp;
	struct screen		*s = wp->screen;
	u_int		 	 i, j;

	tty_reset(tty);

	tty_region(tty, 0, screen_size_y(s) - 1, wp->yoff);
	tty_cursor(tty, 0, 0, wp->xoff, wp->yoff);
	if (wp->xoff == 0 && screen_size_x(s) >= tty->sx &&
	    tty_term_has(tty->term, TTYC_EL)) {
		for (i = 0; i < ctx->ocy; i++) {
			tty_putcode(tty, TTYC_EL);
			tty_emulate_repeat(tty, TTYC_CUD, TTYC_CUD1, 1);
			tty->cy++;
		}
	} else {
		for (j = 0; j < ctx->ocy; j++) {
			tty_cursor(tty, 0, j, wp->xoff, wp->yoff);
			for (i = 0; i < screen_size_x(s); i++)
				tty_putc(tty, ' ');
		}
	}
	for (i = 0; i <= ctx->ocx; i++)
		tty_putc(tty, ' ');
}

void
tty_cmd_clearscreen(struct tty *tty, const struct tty_ctx *ctx)
{
 	struct window_pane	*wp = ctx->wp;
	struct screen		*s = wp->screen;
	u_int		 	 i, j;

	tty_reset(tty);

	tty_region(tty, 0, screen_size_y(s) - 1, wp->yoff);
	tty_cursor(tty, 0, 0, wp->xoff, wp->yoff);
	if (wp->xoff == 0 && screen_size_x(s) >= tty->sx &&
	    tty_term_has(tty->term, TTYC_EL)) {
		for (i = 0; i < screen_size_y(s); i++) {
			tty_putcode(tty, TTYC_EL);
			if (i != screen_size_y(s) - 1) {
				tty_emulate_repeat(tty, TTYC_CUD, TTYC_CUD1, 1);
				tty->cy++;
			}
		}
	} else {
		for (j = 0; j < screen_size_y(s); j++) {
			tty_cursor(tty, 0, j, wp->xoff, wp->yoff);
			for (i = 0; i < screen_size_x(s); i++)
				tty_putc(tty, ' ');
		}
	}
}

void
tty_cmd_alignmenttest(struct tty *tty, const struct tty_ctx *ctx)
{
	struct window_pane	*wp = ctx->wp;
	struct screen		*s = wp->screen;
	u_int			 i, j;

	tty_reset(tty);

	tty_region(tty, 0, screen_size_y(s) - 1, wp->yoff);

	for (j = 0; j < screen_size_y(s); j++) {
		tty_cursor(tty, 0, j, wp->xoff, wp->yoff);
		for (i = 0; i < screen_size_x(s); i++)
			tty_putc(tty, 'E');
	}
}

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

	tty_cursor(tty, ctx->ocx, ctx->ocy, wp->xoff, wp->yoff);

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

void
tty_cmd_utf8character(struct tty *tty, const struct tty_ctx *ctx)
{
	u_char	*ptr = ctx->ptr;
	size_t	 i;

	for (i = 0; i < UTF8_SIZE; i++) {
		if (ptr[i] == 0xff)
			break;
		tty_putc(tty, ptr[i]);
	}
}

void
tty_cell(
    struct tty *tty, const struct grid_cell *gc, const struct grid_utf8 *gu)
{
	u_int	i;

	/* Skip last character if terminal is stupid. */
	if (tty->term->flags & TERM_EARLYWRAP &&
	    tty->cy == tty->sy - 1 && tty->cx == tty->sx - 1)
		return;

	/* If this is a padding character, do nothing. */
	if (gc->flags & GRID_FLAG_PADDING)
		return;

	/* Set the attributes. */
	tty_attributes(tty, gc);

	/* If not UTF-8, write directly. */
	if (!(gc->flags & GRID_FLAG_UTF8)) {
		if (gc->data < 0x20 || gc->data == 0x7f)
			return;
		tty_putc(tty, gc->data);
		return;
	}

	/* If the terminal doesn't support UTF-8, write underscores. */
	if (!(tty->flags & TTY_UTF8)) {
		for (i = 0; i < gu->width; i++)
			tty_putc(tty, '_');
		return;
	}

	/* Otherwise, write UTF-8. */
	tty_pututf8(tty, gu);
}

void
tty_reset(struct tty *tty)
{
	struct grid_cell	*gc = &tty->cell;

	if (memcmp(gc, &grid_default_cell, sizeof *gc) == 0)
		return;

	if (tty_term_has(tty->term, TTYC_RMACS) && gc->attr & GRID_ATTR_CHARSET)
		tty_putcode(tty, TTYC_RMACS);
	tty_putcode(tty, TTYC_SGR0);
	memcpy(gc, &grid_default_cell, sizeof *gc);
}

void
tty_region(struct tty *tty, u_int rupper, u_int rlower, u_int oy)
{
	if (!tty_term_has(tty->term, TTYC_CSR))
		return;
	if (tty->rlower != oy + rlower || tty->rupper != oy + rupper) {
		tty->rlower = oy + rlower;
		tty->rupper = oy + rupper;
		tty->cx = 0;
	 	tty->cy = 0;
		tty_putcode2(tty, TTYC_CSR, tty->rupper, tty->rlower);
	}
}

void
tty_cursor(struct tty *tty, u_int cx, u_int cy, u_int ox, u_int oy)
{
	if (ox + cx == 0 && tty->cx != 0 && tty->cy == oy + cy) {
		tty->cx = 0;
		tty_putc(tty, '\r');
	} else if (tty->cx != ox + cx || tty->cy != oy + cy) {
		tty->cx = ox + cx;
		tty->cy = oy + cy;
		tty_putcode2(tty, TTYC_CUP, tty->cy, tty->cx);
	}
}

void
tty_attributes(struct tty *tty, const struct grid_cell *gc)
{
	struct grid_cell	*tc = &tty->cell;
	u_char			 changed;
	u_int			 fg, bg, attr;

	/*
	 * If no setab, try to use the reverse attribute as a best-effort for a
	 * non-default background. This is a bit of a hack but it doesn't do
	 * any serious harm and makes a couple of applications happier.
	 */
	fg = gc->fg; bg = gc->bg; attr = gc->attr;
	if (!tty_term_has(tty->term, TTYC_SETAB)) {
		if (attr & GRID_ATTR_REVERSE) {
			if (fg != 7 && fg != 8)
				attr &= ~GRID_ATTR_REVERSE;
		} else {
			if (bg != 0 && bg != 8)
				attr |= GRID_ATTR_REVERSE;
		}
	}

	/* If any bits are being cleared, reset everything. */
	if (tc->attr & ~attr)
		tty_reset(tty);

	/* Filter out attribute bits already set. */
	changed = attr & ~tc->attr;
	tc->attr = attr;

	/* Set the attributes. */
	if (changed & GRID_ATTR_BRIGHT)
		tty_putcode(tty, TTYC_BOLD);
	if (changed & GRID_ATTR_DIM)
		tty_putcode(tty, TTYC_DIM);
	if (changed & GRID_ATTR_ITALICS)
		tty_putcode(tty, TTYC_SMSO);
	if (changed & GRID_ATTR_UNDERSCORE)
		tty_putcode(tty, TTYC_SMUL);
	if (changed & GRID_ATTR_BLINK)
		tty_putcode(tty, TTYC_BLINK);
	if (changed & GRID_ATTR_REVERSE) {
		if (tty_term_has(tty->term, TTYC_REV))
			tty_putcode(tty, TTYC_REV);
		else if (tty_term_has(tty->term, TTYC_SMSO))
			tty_putcode(tty, TTYC_SMSO);
	}
	if (changed & GRID_ATTR_HIDDEN)
		tty_putcode(tty, TTYC_INVIS);
	if (changed & GRID_ATTR_CHARSET)
		tty_putcode(tty, TTYC_SMACS);

	/* Set foreground colour. */
	if (fg != tc->fg ||
	    (gc->flags & GRID_FLAG_FG256) != (tc->flags & GRID_FLAG_FG256)) {
		tty_attributes_fg(tty, gc);
		tc->fg = fg;
		tc->flags &= ~GRID_FLAG_FG256;
		tc->flags |= gc->flags & GRID_FLAG_FG256;
	}

	/* Set background colour. */
	if (bg != tc->bg ||
	    (gc->flags & GRID_FLAG_BG256) != (tc->flags & GRID_FLAG_BG256)) {
		tty_attributes_bg(tty, gc);
		tc->bg = bg;
		tc->flags &= ~GRID_FLAG_BG256;
		tc->flags |= gc->flags & GRID_FLAG_BG256;
	}
}

int
tty_try_256(struct tty *tty, u_char colour, const char *type)
{
	char	s[32];

	if (!(tty->term->flags & TERM_256COLOURS) &&
	    !(tty->term_flags & TERM_256COLOURS))
		return (-1);

	xsnprintf(s, sizeof s, "\033[%s;5;%hhum", type, colour);
	tty_puts(tty, s);
	return (0);
}

int
tty_try_88(struct tty *tty, u_char colour, const char *type)
{
	char	s[32];

	if (!(tty->term->flags & TERM_88COLOURS) &&
	    !(tty->term_flags & TERM_88COLOURS))
		return (-1);
	colour = colour_256to88(colour);

	xsnprintf(s, sizeof s, "\033[%s;5;%hhum", type, colour);
	tty_puts(tty, s);
	return (0);
}

void
tty_attributes_fg(struct tty *tty, const struct grid_cell *gc)
{
	u_char	fg;

	fg = gc->fg;
	if (gc->flags & GRID_FLAG_FG256) {
		if (tty_try_256(tty, fg, "38") == 0)
			return;
		if (tty_try_88(tty, fg, "38") == 0)
			return;
		fg = colour_256to16(fg);
		if (fg & 8) {
			fg &= 7;
			tty_putcode(tty, TTYC_BOLD);
			tty->cell.attr |= GRID_ATTR_BRIGHT;
		} else if (tty->cell.attr & GRID_ATTR_BRIGHT)
			tty_reset(tty);
	}

	if (fg == 8 &&
	    !(tty->term->flags & TERM_HASDEFAULTS) &&
	    !(tty->term_flags & TERM_HASDEFAULTS))
		fg = 7;
	if (fg == 8)
		tty_puts(tty, "\033[39m");
	else
		tty_putcode1(tty, TTYC_SETAF, fg);
}

void
tty_attributes_bg(struct tty *tty, const struct grid_cell *gc)
{
	u_char	bg;

	bg = gc->bg;
	if (gc->flags & GRID_FLAG_BG256) {
		if (tty_try_256(tty, bg, "48") == 0)
			return;
		if (tty_try_88(tty, bg, "48") == 0)
			return;
		bg = colour_256to16(bg);
		if (bg & 8)
			bg &= 7;
	}

	if (bg == 8 &&
	    !(tty->term->flags & TERM_HASDEFAULTS) &&
	    !(tty->term_flags & TERM_HASDEFAULTS))
		bg = 0;
	if (bg == 8)
		tty_puts(tty, "\033[49m");
	else
		tty_putcode1(tty, TTYC_SETAB, bg);
}