* Copyright (c) 2007 Nicholas Marriott <nicholas.marriott@gmail.com>

/* $OpenBSD$ */

/*
* Copyright (c) 2007 Nicholas Marriott <[email protected]>
*
* 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 <netinet/in.h>

#include <curses.h>
#include <errno.h>
#include <fcntl.h>
#include <resolv.h>
#include <stdlib.h>
#include <string.h>
#include <termios.h>
#include <time.h>
#include <unistd.h>

#include "tmux.h"

static int tty_log_fd = -1;

static void tty_set_italics(struct tty *);
static int tty_try_colour(struct tty *, int, const char *);
static void tty_force_cursor_colour(struct tty *, int);
static void tty_cursor_pane(struct tty *, const struct tty_ctx *, u_int,
u_int);
static void tty_cursor_pane_unless_wrap(struct tty *,
const struct tty_ctx *, u_int, u_int);
static void tty_invalidate(struct tty *);
static void tty_colours(struct tty *, const struct grid_cell *);
static void tty_check_fg(struct tty *, struct colour_palette *,
struct grid_cell *);
static void tty_check_bg(struct tty *, struct colour_palette *,
struct grid_cell *);
static void tty_check_us(struct tty *, struct colour_palette *,
struct grid_cell *);
static void tty_colours_fg(struct tty *, const struct grid_cell *);
static void tty_colours_bg(struct tty *, const struct grid_cell *);
static void tty_colours_us(struct tty *, const struct grid_cell *);

static void tty_region_pane(struct tty *, const struct tty_ctx *, u_int,
u_int);
static void tty_region(struct tty *, u_int, u_int);
static void tty_margin_pane(struct tty *, const struct tty_ctx *);
static void tty_margin(struct tty *, u_int, u_int);
static int tty_large_region(struct tty *, const struct tty_ctx *);
static int tty_fake_bce(const struct tty *, const struct grid_cell *,
u_int);
static void tty_redraw_region(struct tty *, const struct tty_ctx *);
static void tty_emulate_repeat(struct tty *, enum tty_code_code,
enum tty_code_code, u_int);
static void tty_repeat_space(struct tty *, u_int);
static void tty_draw_pane(struct tty *, const struct tty_ctx *, u_int);
static void tty_default_attributes(struct tty *, const struct grid_cell *,
struct colour_palette *, u_int, struct hyperlinks *);
static int tty_check_overlay(struct tty *, u_int, u_int);
static void tty_check_overlay_range(struct tty *, u_int, u_int, u_int,
struct overlay_ranges *);

#ifdef ENABLE_SIXEL
static void tty_write_one(void (*)(struct tty *, const struct tty_ctx *),
struct client *, struct tty_ctx *);
#endif

#define tty_use_margin(tty) \
(tty->term->flags & TERM_DECSLRM)
#define tty_full_width(tty, ctx) \
((ctx)->xoff == 0 && (ctx)->sx >= (tty)->sx)

#define TTY_BLOCK_INTERVAL (100000 /* 100 milliseconds */)
#define TTY_BLOCK_START(tty) (1 + ((tty)->sx * (tty)->sy) * 8)
#define TTY_BLOCK_STOP(tty) (1 + ((tty)->sx * (tty)->sy) / 8)

#define TTY_QUERY_TIMEOUT 5
#define TTY_REQUEST_LIMIT 30

void
tty_create_log(void)
{
char name[64];

xsnprintf(name, sizeof name, "tmux-out-%ld.log", (long)getpid());

tty_log_fd = open(name, O_WRONLY|O_CREAT|O_TRUNC, 0644);
if (tty_log_fd != -1 && fcntl(tty_log_fd, F_SETFD, FD_CLOEXEC) == -1)
fatal("fcntl failed");
}

int
tty_init(struct tty *tty, struct client *c)
{
if (!isatty(c->fd))
return (-1);

memset(tty, 0, sizeof *tty);
tty->client = c;

tty->cstyle = SCREEN_CURSOR_DEFAULT;
tty->ccolour = -1;
tty->fg = tty->bg = -1;

if (tcgetattr(c->fd, &tty->tio) != 0)
return (-1);
return (0);
}

void
tty_resize(struct tty *tty)
{
struct client *c = tty->client;
struct winsize ws;
u_int sx, sy, xpixel, ypixel;

if (ioctl(c->fd, TIOCGWINSZ, &ws) != -1) {
sx = ws.ws_col;
if (sx == 0) {
sx = 80;
xpixel = 0;
} else
xpixel = ws.ws_xpixel / sx;
sy = ws.ws_row;
if (sy == 0) {
sy = 24;
ypixel = 0;
} else
ypixel = ws.ws_ypixel / sy;
} else {
sx = 80;
sy = 24;
xpixel = 0;
ypixel = 0;
}
log_debug("%s: %s now %ux%u (%ux%u)", __func__, c->name, sx, sy,
xpixel, ypixel);
tty_set_size(tty, sx, sy, xpixel, ypixel);
tty_invalidate(tty);
}

void
tty_set_size(struct tty *tty, u_int sx, u_int sy, u_int xpixel, u_int ypixel)
{
tty->sx = sx;
tty->sy = sy;
tty->xpixel = xpixel;
tty->ypixel = ypixel;
}

static void
tty_read_callback(__unused int fd, __unused short events, void *data)
{
struct tty *tty = data;
struct client *c = tty->client;
const char *name = c->name;
size_t size = EVBUFFER_LENGTH(tty->in);
int nread;

nread = evbuffer_read(tty->in, c->fd, -1);
if (nread == 0 || nread == -1) {
if (nread == 0)
log_debug("%s: read closed", name);
else
log_debug("%s: read error: %s", name, strerror(errno));
event_del(&tty->event_in);
server_client_lost(tty->client);
return;
}
log_debug("%s: read %d bytes (already %zu)", name, nread, size);

while (tty_keys_next(tty))
;
}

static void
tty_timer_callback(__unused int fd, __unused short events, void *data)
{
struct tty *tty = data;
struct client *c = tty->client;
struct timeval tv = { .tv_usec = TTY_BLOCK_INTERVAL };

log_debug("%s: %zu discarded", c->name, tty->discarded);

c->flags |= CLIENT_ALLREDRAWFLAGS;
c->discarded += tty->discarded;

if (tty->discarded < TTY_BLOCK_STOP(tty)) {
tty->flags &= ~TTY_BLOCK;
tty_invalidate(tty);
return;
}
tty->discarded = 0;
evtimer_add(&tty->timer, &tv);
}

static int
tty_block_maybe(struct tty *tty)
{
struct client *c = tty->client;
size_t size = EVBUFFER_LENGTH(tty->out);
struct timeval tv = { .tv_usec = TTY_BLOCK_INTERVAL };

if (size == 0)
tty->flags &= ~TTY_NOBLOCK;
else if (tty->flags & TTY_NOBLOCK)
return (0);

if (size < TTY_BLOCK_START(tty))
return (0);

if (tty->flags & TTY_BLOCK)
return (1);
tty->flags |= TTY_BLOCK;

log_debug("%s: can't keep up, %zu discarded", c->name, size);

evbuffer_drain(tty->out, size);
c->discarded += size;

tty->discarded = 0;
evtimer_add(&tty->timer, &tv);
return (1);
}

static void
tty_write_callback(__unused int fd, __unused short events, void *data)
{
struct tty *tty = data;
struct client *c = tty->client;
size_t size = EVBUFFER_LENGTH(tty->out);
int nwrite;

nwrite = evbuffer_write(tty->out, c->fd);
if (nwrite == -1)
return;
log_debug("%s: wrote %d bytes (of %zu)", c->name, nwrite, size);

if (c->redraw > 0) {
if ((size_t)nwrite >= c->redraw)
c->redraw = 0;
else
c->redraw -= nwrite;
log_debug("%s: waiting for redraw, %zu bytes left", c->name,
c->redraw);
} else if (tty_block_maybe(tty))
return;

if (EVBUFFER_LENGTH(tty->out) != 0)
event_add(&tty->event_out, NULL);
}

int
tty_open(struct tty *tty, char **cause)
{
struct client *c = tty->client;

tty->term = tty_term_create(tty, c->term_name, c->term_caps,
c->term_ncaps, &c->term_features, cause);
if (tty->term == NULL) {
tty_close(tty);
return (-1);
}
tty->flags |= TTY_OPENED;

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

event_set(&tty->event_in, c->fd, EV_PERSIST|EV_READ,
tty_read_callback, tty);
tty->in = evbuffer_new();
if (tty->in == NULL)
fatal("out of memory");

event_set(&tty->event_out, c->fd, EV_WRITE, tty_write_callback, tty);
tty->out = evbuffer_new();
if (tty->out == NULL)
fatal("out of memory");

evtimer_set(&tty->timer, tty_timer_callback, tty);

tty_start_tty(tty);
tty_keys_build(tty);

return (0);
}

static void
tty_start_timer_callback(__unused int fd, __unused short events, void *data)
{
struct tty *tty = data;
struct client *c = tty->client;

log_debug("%s: start timer fired", c->name);
if ((tty->flags & (TTY_HAVEDA|TTY_HAVEDA2|TTY_HAVEXDA)) == 0)
tty_update_features(tty);
tty->flags |= TTY_ALL_REQUEST_FLAGS;
}

void
tty_start_tty(struct tty *tty)
{
struct client *c = tty->client;
struct termios tio;
struct timeval tv = { .tv_sec = TTY_QUERY_TIMEOUT };

setblocking(c->fd, 0);
event_add(&tty->event_in, NULL);

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|ISIG);
tio.c_cc[VMIN] = 1;
tio.c_cc[VTIME] = 0;
if (tcsetattr(c->fd, TCSANOW, &tio) == 0)
tcflush(c->fd, TCOFLUSH);

tty_putcode(tty, TTYC_SMCUP);

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

if (tty_acs_needed(tty)) {
log_debug("%s: using capabilities for ACS", c->name);
tty_putcode(tty, TTYC_ENACS);
} else
log_debug("%s: using UTF-8 for ACS", c->name);

tty_putcode(tty, TTYC_CNORM);
if (tty_term_has(tty->term, TTYC_KMOUS)) {
tty_puts(tty, "\033[?1000l\033[?1002l\033[?1003l");
tty_puts(tty, "\033[?1006l\033[?1005l");
}
if (tty_term_has(tty->term, TTYC_ENBP))
tty_putcode(tty, TTYC_ENBP);

evtimer_set(&tty->start_timer, tty_start_timer_callback, tty);
evtimer_add(&tty->start_timer, &tv);

tty->flags |= TTY_STARTED;
tty_invalidate(tty);

if (tty->ccolour != -1)
tty_force_cursor_colour(tty, -1);

tty->mouse_drag_flag = 0;
tty->mouse_drag_update = NULL;
tty->mouse_drag_release = NULL;
}

void
tty_send_requests(struct tty *tty)
{
if (~tty->flags & TTY_STARTED)
return;

if (tty->term->flags & TERM_VT100LIKE) {
if (~tty->term->flags & TTY_HAVEDA)
tty_puts(tty, "\033[c");
if (~tty->flags & TTY_HAVEDA2)
tty_puts(tty, "\033[>c");
if (~tty->flags & TTY_HAVEXDA)
tty_puts(tty, "\033[>q");
tty_puts(tty, "\033]10;?\033\\");
tty_puts(tty, "\033]11;?\033\\");
} else
tty->flags |= TTY_ALL_REQUEST_FLAGS;
tty->last_requests = time(NULL);
}

void
tty_repeat_requests(struct tty *tty)
{
time_t t = time(NULL);

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

if (t - tty->last_requests <= TTY_REQUEST_LIMIT)
return;
tty->last_requests = t;

if (tty->term->flags & TERM_VT100LIKE) {
tty_puts(tty, "\033]10;?\033\\");
tty_puts(tty, "\033]11;?\033\\");
}
}

void
tty_stop_tty(struct tty *tty)
{
struct client *c = tty->client;
struct winsize ws;

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

evtimer_del(&tty->start_timer);

event_del(&tty->timer);
tty->flags &= ~TTY_BLOCK;

event_del(&tty->event_in);
event_del(&tty->event_out);

/*
* 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(c->fd, TIOCGWINSZ, &ws) == -1)
return;
if (tcsetattr(c->fd, TCSANOW, &tty->tio) == -1)
return;

tty_raw(tty, tty_term_string_ii(tty->term, TTYC_CSR, 0, ws.ws_row - 1));
if (tty_acs_needed(tty))
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));
if (tty->cstyle != SCREEN_CURSOR_DEFAULT) {
if (tty_term_has(tty->term, TTYC_SE))
tty_raw(tty, tty_term_string(tty->term, TTYC_SE));
else if (tty_term_has(tty->term, TTYC_SS))
tty_raw(tty, tty_term_string_i(tty->term, TTYC_SS, 0));
}
if (tty->ccolour != -1)
tty_raw(tty, tty_term_string(tty->term, TTYC_CR));

tty_raw(tty, tty_term_string(tty->term, TTYC_CNORM));
if (tty_term_has(tty->term, TTYC_KMOUS)) {
tty_raw(tty, "\033[?1000l\033[?1002l\033[?1003l");
tty_raw(tty, "\033[?1006l\033[?1005l");
}
if (tty_term_has(tty->term, TTYC_DSBP))
tty_raw(tty, tty_term_string(tty->term, TTYC_DSBP));

if (tty->term->flags & TERM_VT100LIKE)
tty_raw(tty, "\033[?7727l");
tty_raw(tty, tty_term_string(tty->term, TTYC_DSFCS));
tty_raw(tty, tty_term_string(tty->term, TTYC_DSEKS));

if (tty_use_margin(tty))
tty_raw(tty, tty_term_string(tty->term, TTYC_DSMG));
tty_raw(tty, tty_term_string(tty->term, TTYC_RMCUP));

setblocking(c->fd, 1);
}

void
tty_close(struct tty *tty)
{
if (event_initialized(&tty->key_timer))
evtimer_del(&tty->key_timer);
tty_stop_tty(tty);

if (tty->flags & TTY_OPENED) {
evbuffer_free(tty->in);
event_del(&tty->event_in);
evbuffer_free(tty->out);
event_del(&tty->event_out);

tty_term_free(tty->term);
tty_keys_free(tty);

tty->flags &= ~TTY_OPENED;
}
}

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

void
tty_update_features(struct tty *tty)
{
struct client *c = tty->client;

if (tty_apply_features(tty->term, c->term_features))
tty_term_apply_overrides(tty->term);

if (tty_use_margin(tty))
tty_putcode(tty, TTYC_ENMG);
if (options_get_number(global_options, "extended-keys"))
tty_puts(tty, tty_term_string(tty->term, TTYC_ENEKS));
if (options_get_number(global_options, "focus-events"))
tty_puts(tty, tty_term_string(tty->term, TTYC_ENFCS));
if (tty->term->flags & TERM_VT100LIKE)
tty_puts(tty, "\033[?7727h");

/*
* Features might have changed since the first draw during attach. For
* example, this happens when DA responses are received.
*/
server_redraw_client(c);

tty_invalidate(tty);
}

void
tty_raw(struct tty *tty, const char *s)
{
struct client *c = tty->client;
ssize_t n, slen;
u_int i;

slen = strlen(s);
for (i = 0; i < 5; i++) {
n = write(c->fd, s, slen);
if (n >= 0) {
s += n;
slen -= n;
if (slen == 0)
break;
} else if (n == -1 && errno != EAGAIN)
break;
usleep(100);
}
}

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

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

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

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

void
tty_putcode_s(struct tty *tty, enum tty_code_code code, const char *a)
{
if (a != NULL)
tty_puts(tty, tty_term_string_s(tty->term, code, a));
}

void
tty_putcode_ss(struct tty *tty, enum tty_code_code code, const char *a,
const char *b)
{
if (a != NULL && b != NULL)
tty_puts(tty, tty_term_string_ss(tty->term, code, a, b));
}

static void
tty_add(struct tty *tty, const char *buf, size_t len)
{
struct client *c = tty->client;

if (tty->flags & TTY_BLOCK) {
tty->discarded += len;
return;
}

evbuffer_add(tty->out, buf, len);
log_debug("%s: %.*s", c->name, (int)len, buf);
c->written += len;

if (tty_log_fd != -1)
write(tty_log_fd, buf, len);
if (tty->flags & TTY_STARTED)
event_add(&tty->event_out, NULL);
}

void
tty_puts(struct tty *tty, const char *s)
{
if (*s != '\0')
tty_add(tty, s, strlen(s));
}

void
tty_putc(struct tty *tty, u_char ch)
{
const char *acs;

if ((tty->term->flags & TERM_NOAM) &&
ch >= 0x20 && ch != 0x7f &&
tty->cy == tty->sy - 1 &&
tty->cx + 1 >= tty->sx)
return;

if (tty->cell.attr & GRID_ATTR_CHARSET) {
acs = tty_acs_get(tty, ch);
if (acs != NULL)
tty_add(tty, acs, strlen(acs));
else
tty_add(tty, (char *)&ch, 1);
} else
tty_add(tty, (char *)&ch, 1);

if (ch >= 0x20 && ch != 0x7f) {
if (tty->cx >= tty->sx) {
tty->cx = 1;
if (tty->cy != tty->rlower)
tty->cy++;

/*
* On !am terminals, force the cursor position to where
* we think it should be after a line wrap - this means
* it works on sensible terminals as well.
*/
if (tty->term->flags & TERM_NOAM)
tty_putcode_ii(tty, TTYC_CUP, tty->cy, tty->cx);
} else
tty->cx++;
}
}

void
tty_putn(struct tty *tty, const void *buf, size_t len, u_int width)
{
if ((tty->term->flags & TERM_NOAM) &&
tty->cy == tty->sy - 1 &&
tty->cx + len >= tty->sx)
len = tty->sx - tty->cx - 1;

tty_add(tty, buf, len);
if (tty->cx + width > tty->sx) {
tty->cx = (tty->cx + width) - tty->sx;
if (tty->cx <= tty->sx)
tty->cy++;
else
tty->cx = tty->cy = UINT_MAX;
} else
tty->cx += width;
}

static void
tty_set_italics(struct tty *tty)
{
const char *s;

if (tty_term_has(tty->term, TTYC_SITM)) {
s = options_get_string(global_options, "default-terminal");
if (strcmp(s, "screen") != 0 && strncmp(s, "screen-", 7) != 0) {
tty_putcode(tty, TTYC_SITM);
return;
}
}
tty_putcode(tty, TTYC_SMSO);
}

void
tty_set_title(struct tty *tty, const char *title)
{
if (!tty_term_has(tty->term, TTYC_TSL) ||
!tty_term_has(tty->term, TTYC_FSL))
return;

tty_putcode(tty, TTYC_TSL);
tty_puts(tty, title);
tty_putcode(tty, TTYC_FSL);
}

void
tty_set_path(struct tty *tty, const char *title)
{
if (!tty_term_has(tty->term, TTYC_SWD) ||
!tty_term_has(tty->term, TTYC_FSL))
return;

tty_putcode(tty, TTYC_SWD);
tty_puts(tty, title);
tty_putcode(tty, TTYC_FSL);
}

static void
tty_force_cursor_colour(struct tty *tty, int c)
{
u_char r, g, b;
char s[13];

if (c != -1)
c = colour_force_rgb(c);
if (c == tty->ccolour)
return;
if (c == -1)
tty_putcode(tty, TTYC_CR);
else {
colour_split_rgb(c, &r, &g, &b);
xsnprintf(s, sizeof s, "rgb:%02hhx/%02hhx/%02hhx", r, g, b);
tty_putcode_s(tty, TTYC_CS, s);
}
tty->ccolour = c;
}

static int
tty_update_cursor(struct tty *tty, int mode, struct screen *s)
{
enum screen_cursor_style cstyle;
int ccolour, changed, cmode = mode;

/* Set cursor colour if changed. */
if (s != NULL) {
ccolour = s->ccolour;
if (s->ccolour == -1)
ccolour = s->default_ccolour;
tty_force_cursor_colour(tty, ccolour);
}

/* If cursor is off, set as invisible. */
if (~cmode & MODE_CURSOR) {
if (tty->mode & MODE_CURSOR)
tty_putcode(tty, TTYC_CIVIS);
return (cmode);
}

/* Check if blinking or very visible flag changed or style changed. */
if (s == NULL)
cstyle = tty->cstyle;
else {
cstyle = s->cstyle;
if (cstyle == SCREEN_CURSOR_DEFAULT) {
if (~cmode & MODE_CURSOR_BLINKING_SET) {
if (s->default_mode & MODE_CURSOR_BLINKING)
cmode |= MODE_CURSOR_BLINKING;
else
cmode &= ~MODE_CURSOR_BLINKING;
}
cstyle = s->default_cstyle;
}
}

/* If nothing changed, do nothing. */
changed = cmode ^ tty->mode;
if ((changed & CURSOR_MODES) == 0 && cstyle == tty->cstyle)
return (cmode);

/*
* Set cursor style. If an explicit style has been set with DECSCUSR,
* set it if supported, otherwise send cvvis for blinking styles.
*
* If no style, has been set (SCREEN_CURSOR_DEFAULT), then send cvvis
* if either the blinking or very visible flags are set.
*/
tty_putcode(tty, TTYC_CNORM);
switch (cstyle) {
case SCREEN_CURSOR_DEFAULT:
if (tty->cstyle != SCREEN_CURSOR_DEFAULT) {
if (tty_term_has(tty->term, TTYC_SE))
tty_putcode(tty, TTYC_SE);
else
tty_putcode_i(tty, TTYC_SS, 0);
}
if (cmode & (MODE_CURSOR_BLINKING|MODE_CURSOR_VERY_VISIBLE))
tty_putcode(tty, TTYC_CVVIS);
break;
case SCREEN_CURSOR_BLOCK:
if (tty_term_has(tty->term, TTYC_SS)) {
if (cmode & MODE_CURSOR_BLINKING)
tty_putcode_i(tty, TTYC_SS, 1);
else
tty_putcode_i(tty, TTYC_SS, 2);
} else if (cmode & MODE_CURSOR_BLINKING)
tty_putcode(tty, TTYC_CVVIS);
break;
case SCREEN_CURSOR_UNDERLINE:
if (tty_term_has(tty->term, TTYC_SS)) {
if (cmode & MODE_CURSOR_BLINKING)
tty_putcode_i(tty, TTYC_SS, 3);
else
tty_putcode_i(tty, TTYC_SS, 4);
} else if (cmode & MODE_CURSOR_BLINKING)
tty_putcode(tty, TTYC_CVVIS);
break;
case SCREEN_CURSOR_BAR:
if (tty_term_has(tty->term, TTYC_SS)) {
if (cmode & MODE_CURSOR_BLINKING)
tty_putcode_i(tty, TTYC_SS, 5);
else
tty_putcode_i(tty, TTYC_SS, 6);
} else if (cmode & MODE_CURSOR_BLINKING)
tty_putcode(tty, TTYC_CVVIS);
break;
}
tty->cstyle = cstyle;
return (cmode);
}

void
tty_update_mode(struct tty *tty, int mode, struct screen *s)
{
struct tty_term *term = tty->term;
struct client *c = tty->client;
int changed;

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

if (tty_update_cursor(tty, mode, s) & MODE_CURSOR_BLINKING)
mode |= MODE_CURSOR_BLINKING;
else
mode &= ~MODE_CURSOR_BLINKING;

changed = mode ^ tty->mode;
if (log_get_level() != 0 && changed != 0) {
log_debug("%s: current mode %s", c->name,
screen_mode_to_string(tty->mode));
log_debug("%s: setting mode %s", c->name,
screen_mode_to_string(mode));
}

if ((changed & ALL_MOUSE_MODES) && tty_term_has(term, TTYC_KMOUS)) {
/*
* If the mouse modes have changed, clear then all and apply
* again. There are differences in how terminals track the
* various bits.
*/
tty_puts(tty, "\033[?1006l\033[?1000l\033[?1002l\033[?1003l");
if (mode & ALL_MOUSE_MODES)
tty_puts(tty, "\033[?1006h");
if (mode & MODE_MOUSE_ALL)
tty_puts(tty, "\033[?1000h\033[?1002h\033[?1003h");
else if (mode & MODE_MOUSE_BUTTON)
tty_puts(tty, "\033[?1000h\033[?1002h");
else if (mode & MODE_MOUSE_STANDARD)
tty_puts(tty, "\033[?1000h");
}
tty->mode = mode;
}

static 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_putcode_i(tty, code, n);
else {
while (n-- > 0)
tty_putcode(tty, code1);
}
}

static void
tty_repeat_space(struct tty *tty, u_int n)
{
static char s[500];

if (*s != ' ')
memset(s, ' ', sizeof s);

while (n > sizeof s) {
tty_putn(tty, s, sizeof s, sizeof s);
n -= sizeof s;
}
if (n != 0)
tty_putn(tty, s, n, n);
}

/* Is this window bigger than the terminal? */
int
tty_window_bigger(struct tty *tty)
{
struct client *c = tty->client;
struct window *w = c->session->curw->window;

return (tty->sx < w->sx || tty->sy - status_line_size(c) < w->sy);
}

/* What offset should this window be drawn at? */
int
tty_window_offset(struct tty *tty, u_int *ox, u_int *oy, u_int *sx, u_int *sy)
{
*ox = tty->oox;
*oy = tty->ooy;
*sx = tty->osx;
*sy = tty->osy;

return (tty->oflag);
}

/* What offset should this window be drawn at? */
static int
tty_window_offset1(struct tty *tty, u_int *ox, u_int *oy, u_int *sx, u_int *sy)
{
struct client *c = tty->client;
struct window *w = c->session->curw->window;
struct window_pane *wp = server_client_get_pane(c);
u_int cx, cy, lines;

lines = status_line_size(c);

if (tty->sx >= w->sx && tty->sy - lines >= w->sy) {
*ox = 0;
*oy = 0;
*sx = w->sx;
*sy = w->sy;

c->pan_window = NULL;
return (0);
}

*sx = tty->sx;
*sy = tty->sy - lines;

if (c->pan_window == w) {
if (*sx >= w->sx)
c->pan_ox = 0;
else if (c->pan_ox + *sx > w->sx)
c->pan_ox = w->sx - *sx;
*ox = c->pan_ox;
if (*sy >= w->sy)
c->pan_oy = 0;
else if (c->pan_oy + *sy > w->sy)
c->pan_oy = w->sy - *sy;
*oy = c->pan_oy;
return (1);
}

if (~wp->screen->mode & MODE_CURSOR) {
*ox = 0;
*oy = 0;
} else {
cx = wp->xoff + wp->screen->cx;
cy = wp->yoff + wp->screen->cy;

if (cx < *sx)
*ox = 0;
else if (cx > w->sx - *sx)
*ox = w->sx - *sx;
else
*ox = cx - *sx / 2;

if (cy < *sy)
*oy = 0;
else if (cy > w->sy - *sy)
*oy = w->sy - *sy;
else
*oy = cy - *sy / 2;
}

c->pan_window = NULL;
return (1);
}

/* Update stored offsets for a window and redraw if necessary. */
void
tty_update_window_offset(struct window *w)
{
struct client *c;

TAILQ_FOREACH(c, &clients, entry) {
if (c->session != NULL &&
c->session->curw != NULL &&
c->session->curw->window == w)
tty_update_client_offset(c);
}
}

/* Update stored offsets for a client and redraw if necessary. */
void
tty_update_client_offset(struct client *c)
{
u_int ox, oy, sx, sy;

if (~c->flags & CLIENT_TERMINAL)
return;

c->tty.oflag = tty_window_offset1(&c->tty, &ox, &oy, &sx, &sy);
if (ox == c->tty.oox &&
oy == c->tty.ooy &&
sx == c->tty.osx &&
sy == c->tty.osy)
return;

log_debug ("%s: %s offset has changed (%u,%u %ux%u -> %u,%u %ux%u)",
__func__, c->name, c->tty.oox, c->tty.ooy, c->tty.osx, c->tty.osy,
ox, oy, sx, sy);

c->tty.oox = ox;
c->tty.ooy = oy;
c->tty.osx = sx;
c->tty.osy = sy;

c->flags |= (CLIENT_REDRAWWINDOW|CLIENT_REDRAWSTATUS);
}

/*
* Is the region large enough to be worth redrawing once later rather than
* probably several times now? Currently yes if it is more than 50% of the
* pane.
*/
static int
tty_large_region(__unused struct tty *tty, const struct tty_ctx *ctx)
{
return (ctx->orlower - ctx->orupper >= ctx->sy / 2);
}

/*
* Return if BCE is needed but the terminal doesn't have it - it'll need to be
* emulated.
*/
static int
tty_fake_bce(const struct tty *tty, const struct grid_cell *gc, u_int bg)
{
if (tty_term_flag(tty->term, TTYC_BCE))
return (0);
if (!COLOUR_DEFAULT(bg) || !COLOUR_DEFAULT(gc->bg))
return (1);
return (0);
}

/*
* 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.
*/
static void
tty_redraw_region(struct tty *tty, const struct tty_ctx *ctx)
{
struct client *c = tty->client;
u_int i;

/*
* If region is large, schedule a redraw. In most cases this is likely
* to be followed by some more scrolling.
*/
if (tty_large_region(tty, ctx)) {
log_debug("%s: %s large redraw", __func__, c->name);
ctx->redraw_cb(ctx);
return;
}

for (i = ctx->orupper; i <= ctx->orlower; i++)
tty_draw_pane(tty, ctx, i);
}

/* Is this position visible in the pane? */
static int
tty_is_visible(__unused struct tty *tty, const struct tty_ctx *ctx, u_int px,
u_int py, u_int nx, u_int ny)
{
u_int xoff = ctx->rxoff + px, yoff = ctx->ryoff + py;

if (!ctx->bigger)
return (1);

if (xoff + nx <= ctx->wox || xoff >= ctx->wox + ctx->wsx ||
yoff + ny <= ctx->woy || yoff >= ctx->woy + ctx->wsy)
return (0);
return (1);
}

/* Clamp line position to visible part of pane. */
static int
tty_clamp_line(struct tty *tty, const struct tty_ctx *ctx, u_int px, u_int py,
u_int nx, u_int *i, u_int *x, u_int *rx, u_int *ry)
{
u_int xoff = ctx->rxoff + px;

if (!tty_is_visible(tty, ctx, px, py, nx, 1))
return (0);
*ry = ctx->yoff + py - ctx->woy;

if (xoff >= ctx->wox && xoff + nx <= ctx->wox + ctx->wsx) {
/* All visible. */
*i = 0;
*x = ctx->xoff + px - ctx->wox;
*rx = nx;
} else if (xoff < ctx->wox && xoff + nx > ctx->wox + ctx->wsx) {
/* Both left and right not visible. */
*i = ctx->wox;
*x = 0;
*rx = ctx->wsx;
} else if (xoff < ctx->wox) {
/* Left not visible. */
*i = ctx->wox - (ctx->xoff + px);
*x = 0;
*rx = nx - *i;
} else {
/* Right not visible. */
*i = 0;
*x = (ctx->xoff + px) - ctx->wox;
*rx = ctx->wsx - *x;
}
if (*rx > nx)
fatalx("%s: x too big, %u > %u", __func__, *rx, nx);

return (1);
}

/* Clear a line. */
static void
tty_clear_line(struct tty *tty, const struct grid_cell *defaults, u_int py,
u_int px, u_int nx, u_int bg)
{
struct client *c = tty->client;
struct overlay_ranges r;
u_int i;

log_debug("%s: %s, %u at %u,%u", __func__, c->name, nx, px, py);

/* Nothing to clear. */
if (nx == 0)
return;

/* If genuine BCE is available, can try escape sequences. */
if (c->overlay_check == NULL && !tty_fake_bce(tty, defaults, bg)) {
/* Off the end of the line, use EL if available. */
if (px + nx >= tty->sx && tty_term_has(tty->term, TTYC_EL)) {
tty_cursor(tty, px, py);
tty_putcode(tty, TTYC_EL);
return;
}

/* At the start of the line. Use EL1. */
if (px == 0 && tty_term_has(tty->term, TTYC_EL1)) {
tty_cursor(tty, px + nx - 1, py);
tty_putcode(tty, TTYC_EL1);
return;
}

/* Section of line. Use ECH if possible. */
if (tty_term_has(tty->term, TTYC_ECH)) {
tty_cursor(tty, px, py);
tty_putcode_i(tty, TTYC_ECH, nx);
return;
}
}

/*
* Couldn't use an escape sequence, use spaces. Clear only the visible
* bit if there is an overlay.
*/
tty_check_overlay_range(tty, px, py, nx, &r);
for (i = 0; i < OVERLAY_MAX_RANGES; i++) {
if (r.nx[i] == 0)
continue;
tty_cursor(tty, r.px[i], py);
tty_repeat_space(tty, r.nx[i]);
}
}

/* Clear a line, adjusting to visible part of pane. */
static void
tty_clear_pane_line(struct tty *tty, const struct tty_ctx *ctx, u_int py,
u_int px, u_int nx, u_int bg)
{
struct client *c = tty->client;
u_int i, x, rx, ry;

log_debug("%s: %s, %u at %u,%u", __func__, c->name, nx, px, py);

if (tty_clamp_line(tty, ctx, px, py, nx, &i, &x, &rx, &ry))
tty_clear_line(tty, &ctx->defaults, ry, x, rx, bg);
}

/* Clamp area position to visible part of pane. */
static int
tty_clamp_area(struct tty *tty, const struct tty_ctx *ctx, u_int px, u_int py,
u_int nx, u_int ny, u_int *i, u_int *j, u_int *x, u_int *y, u_int *rx,
u_int *ry)
{
u_int xoff = ctx->rxoff + px, yoff = ctx->ryoff + py;

if (!tty_is_visible(tty, ctx, px, py, nx, ny))
return (0);

if (xoff >= ctx->wox && xoff + nx <= ctx->wox + ctx->wsx) {
/* All visible. */
*i = 0;
*x = ctx->xoff + px - ctx->wox;
*rx = nx;
} else if (xoff < ctx->wox && xoff + nx > ctx->wox + ctx->wsx) {
/* Both left and right not visible. */
*i = ctx->wox;
*x = 0;
*rx = ctx->wsx;
} else if (xoff < ctx->wox) {
/* Left not visible. */
*i = ctx->wox - (ctx->xoff + px);
*x = 0;
*rx = nx - *i;
} else {
/* Right not visible. */
*i = 0;
*x = (ctx->xoff + px) - ctx->wox;
*rx = ctx->wsx - *x;
}
if (*rx > nx)
fatalx("%s: x too big, %u > %u", __func__, *rx, nx);

if (yoff >= ctx->woy && yoff + ny <= ctx->woy + ctx->wsy) {
/* All visible. */
*j = 0;
*y = ctx->yoff + py - ctx->woy;
*ry = ny;
} else if (yoff < ctx->woy && yoff + ny > ctx->woy + ctx->wsy) {
/* Both top and bottom not visible. */
*j = ctx->woy;
*y = 0;
*ry = ctx->wsy;
} else if (yoff < ctx->woy) {
/* Top not visible. */
*j = ctx->woy - (ctx->yoff + py);
*y = 0;
*ry = ny - *j;
} else {
/* Bottom not visible. */
*j = 0;
*y = (ctx->yoff + py) - ctx->woy;
*ry = ctx->wsy - *y;
}
if (*ry > ny)
fatalx("%s: y too big, %u > %u", __func__, *ry, ny);

return (1);
}

/* Clear an area, adjusting to visible part of pane. */
static void
tty_clear_area(struct tty *tty, const struct grid_cell *defaults, u_int py,
u_int ny, u_int px, u_int nx, u_int bg)
{
struct client *c = tty->client;
u_int yy;
char tmp[64];

log_debug("%s: %s, %u,%u at %u,%u", __func__, c->name, nx, ny, px, py);

/* Nothing to clear. */
if (nx == 0 || ny == 0)
return;

/* If genuine BCE is available, can try escape sequences. */
if (c->overlay_check == NULL && !tty_fake_bce(tty, defaults, bg)) {
/* Use ED if clearing off the bottom of the terminal. */
if (px == 0 &&
px + nx >= tty->sx &&
py + ny >= tty->sy &&
tty_term_has(tty->term, TTYC_ED)) {
tty_cursor(tty, 0, py);
tty_putcode(tty, TTYC_ED);
return;
}

/*
* On VT420 compatible terminals we can use DECFRA if the
* background colour isn't default (because it doesn't work
* after SGR 0).
*/
if ((tty->term->flags & TERM_DECFRA) && !COLOUR_DEFAULT(bg)) {
xsnprintf(tmp, sizeof tmp, "\033[32;%u;%u;%u;%u$x",
py + 1, px + 1, py + ny, px + nx);
tty_puts(tty, tmp);
return;
}

/* Full lines can be scrolled away to clear them. */
if (px == 0 &&
px + nx >= tty->sx &&
ny > 2 &&
tty_term_has(tty->term, TTYC_CSR) &&
tty_term_has(tty->term, TTYC_INDN)) {
tty_region(tty, py, py + ny - 1);
tty_margin_off(tty);
tty_putcode_i(tty, TTYC_INDN, ny);
return;
}

/*
* If margins are supported, can just scroll the area off to
* clear it.
*/
if (nx > 2 &&
ny > 2 &&
tty_term_has(tty->term, TTYC_CSR) &&
tty_use_margin(tty) &&
tty_term_has(tty->term, TTYC_INDN)) {
tty_region(tty, py, py + ny - 1);
tty_margin(tty, px, px + nx - 1);
tty_putcode_i(tty, TTYC_INDN, ny);
return;
}
}

/* Couldn't use an escape sequence, loop over the lines. */
for (yy = py; yy < py + ny; yy++)
tty_clear_line(tty, defaults, yy, px, nx, bg);
}

/* Clear an area in a pane. */
static void
tty_clear_pane_area(struct tty *tty, const struct tty_ctx *ctx, u_int py,
u_int ny, u_int px, u_int nx, u_int bg)
{
u_int i, j, x, y, rx, ry;

if (tty_clamp_area(tty, ctx, px, py, nx, ny, &i, &j, &x, &y, &rx, &ry))
tty_clear_area(tty, &ctx->defaults, y, ry, x, rx, bg);
}

static void
tty_draw_pane(struct tty *tty, const struct tty_ctx *ctx, u_int py)
{
struct screen *s = ctx->s;
u_int nx = ctx->sx, i, x, rx, ry;

log_debug("%s: %s %u %d", __func__, tty->client->name, py, ctx->bigger);

if (!ctx->bigger) {
tty_draw_line(tty, s, 0, py, nx, ctx->xoff, ctx->yoff + py,
&ctx->defaults, ctx->palette);
return;
}
if (tty_clamp_line(tty, ctx, 0, py, nx, &i, &x, &rx, &ry)) {
tty_draw_line(tty, s, i, py, rx, x, ry, &ctx->defaults,
ctx->palette);
}
}

static const struct grid_cell *
tty_check_codeset(struct tty *tty, const struct grid_cell *gc)
{
static struct grid_cell new;
int c;

/* Characters less than 0x7f are always fine, no matter what. */
if (gc->data.size == 1 && *gc->data.data < 0x7f)
return (gc);

/* UTF-8 terminal and a UTF-8 character - fine. */
if (tty->client->flags & CLIENT_UTF8)
return (gc);
memcpy(&new, gc, sizeof new);

/* See if this can be mapped to an ACS character. */
c = tty_acs_reverse_get(tty, (const char *)gc->data.data, gc->data.size);
if (c != -1) {
utf8_set(&new.data, c);
new.attr |= GRID_ATTR_CHARSET;
return (&new);
}

/* Replace by the right number of underscores. */
new.data.size = gc->data.width;
if (new.data.size > UTF8_SIZE)
new.data.size = UTF8_SIZE;
memset(new.data.data, '_', new.data.size);
return (&new);
}

/*
* Check if a single character is obstructed by the overlay and return a
* boolean.
*/
static int
tty_check_overlay(struct tty *tty, u_int px, u_int py)
{
struct overlay_ranges r;

/*
* A unit width range will always return nx[2] == 0 from a check, even
* with multiple overlays, so it's sufficient to check just the first
* two entries.
*/
tty_check_overlay_range(tty, px, py, 1, &r);
if (r.nx[0] + r.nx[1] == 0)
return (0);
return (1);
}

/* Return parts of the input range which are visible. */
static void
tty_check_overlay_range(struct tty *tty, u_int px, u_int py, u_int nx,
struct overlay_ranges *r)
{
struct client *c = tty->client;

if (c->overlay_check == NULL) {
r->px[0] = px;
r->nx[0] = nx;
r->px[1] = 0;
r->nx[1] = 0;
r->px[2] = 0;
r->nx[2] = 0;
return;
}

c->overlay_check(c, c->overlay_data, px, py, nx, r);
}

void
tty_draw_line(struct tty *tty, struct screen *s, u_int px, u_int py, u_int nx,
u_int atx, u_int aty, const struct grid_cell *defaults,
struct colour_palette *palette)
{
struct grid *gd = s->grid;
struct grid_cell gc, last;
const struct grid_cell *gcp;
struct grid_line *gl;
struct client *c = tty->client;
struct overlay_ranges r;
u_int i, j, ux, sx, width, hidden, eux, nxx;
u_int cellsize;
int flags, cleared = 0, wrapped = 0;
char buf[512];
size_t len;

log_debug("%s: px=%u py=%u nx=%u atx=%u aty=%u", __func__,
px, py, nx, atx, aty);
log_debug("%s: defaults: fg=%d, bg=%d", __func__, defaults->fg,
defaults->bg);

/*
* py is the line in the screen to draw.
* px is the start x and nx is the width to draw.
* atx,aty is the line on the terminal to draw it.
*/

flags = (tty->flags & TTY_NOCURSOR);
tty->flags |= TTY_NOCURSOR;
tty_update_mode(tty, tty->mode, s);

tty_region_off(tty);
tty_margin_off(tty);

/*
* Clamp the width to cellsize - note this is not cellused, because
* there may be empty background cells after it (from BCE).
*/
sx = screen_size_x(s);
if (nx > sx)
nx = sx;
cellsize = grid_get_line(gd, gd->hsize + py)->cellsize;
if (sx > cellsize)
sx = cellsize;
if (sx > tty->sx)
sx = tty->sx;
if (sx > nx)
sx = nx;
ux = 0;

if (py == 0)
gl = NULL;
else
gl = grid_get_line(gd, gd->hsize + py - 1);
if (gl == NULL ||
(~gl->flags & GRID_LINE_WRAPPED) ||
atx != 0 ||
tty->cx < tty->sx ||
nx < tty->sx) {
if (nx < tty->sx &&
atx == 0 &&
px + sx != nx &&
tty_term_has(tty->term, TTYC_EL1) &&
!tty_fake_bce(tty, defaults, 8) &&
c->overlay_check == NULL) {
tty_default_attributes(tty, defaults, palette, 8,
s->hyperlinks);
tty_cursor(tty, nx - 1, aty);
tty_putcode(tty, TTYC_EL1);
cleared = 1;
}
} else {
log_debug("%s: wrapped line %u", __func__, aty);
wrapped = 1;
}

memcpy(&last, &grid_default_cell, sizeof last);
len = 0;
width = 0;

for (i = 0; i < sx; i++) {
grid_view_get_cell(gd, px + i, py, &gc);
gcp = tty_check_codeset(tty, &gc);
if (len != 0 &&
(!tty_check_overlay(tty, atx + ux + width, aty) ||
(gcp->attr & GRID_ATTR_CHARSET) ||
gcp->flags != last.flags ||
gcp->attr != last.attr ||
gcp->fg != last.fg ||
gcp->bg != last.bg ||
gcp->us != last.us ||
gcp->link != last.link ||
ux + width + gcp->data.width > nx ||
(sizeof buf) - len < gcp->data.size)) {
tty_attributes(tty, &last, defaults, palette,
s->hyperlinks);
if (last.flags & GRID_FLAG_CLEARED) {
log_debug("%s: %zu cleared", __func__, len);
tty_clear_line(tty, defaults, aty, atx + ux,
width, last.bg);
} else {
if (!wrapped || atx != 0 || ux != 0)
tty_cursor(tty, atx + ux, aty);
tty_putn(tty, buf, len, width);
}
ux += width;

len = 0;
width = 0;
wrapped = 0;
}

if (gcp->flags & GRID_FLAG_SELECTED)
screen_select_cell(s, &last, gcp);
else
memcpy(&last, gcp, sizeof last);

tty_check_overlay_range(tty, atx + ux, aty, gcp->data.width,
&r);
hidden = 0;
for (j = 0; j < OVERLAY_MAX_RANGES; j++)
hidden += r.nx[j];
hidden = gcp->data.width - hidden;
if (hidden != 0 && hidden == gcp->data.width) {
if (~gcp->flags & GRID_FLAG_PADDING)
ux += gcp->data.width;
} else if (hidden != 0 || ux + gcp->data.width > nx) {
if (~gcp->flags & GRID_FLAG_PADDING) {
tty_attributes(tty, &last, defaults, palette,
s->hyperlinks);
for (j = 0; j < OVERLAY_MAX_RANGES; j++) {
if (r.nx[j] == 0)
continue;
/* Effective width drawn so far. */
eux = r.px[j] - atx;
if (eux < nx) {
tty_cursor(tty, r.px[j], aty);
nxx = nx - eux;
if (r.nx[j] > nxx)
r.nx[j] = nxx;
tty_repeat_space(tty, r.nx[j]);
ux = eux + r.nx[j];
}
}
}
} else if (gcp->attr & GRID_ATTR_CHARSET) {
tty_attributes(tty, &last, defaults, palette,
s->hyperlinks);
tty_cursor(tty, atx + ux, aty);
for (j = 0; j < gcp->data.size; j++)
tty_putc(tty, gcp->data.data[j]);
ux += gcp->data.width;
} else if (~gcp->flags & GRID_FLAG_PADDING) {
memcpy(buf + len, gcp->data.data, gcp->data.size);
len += gcp->data.size;
width += gcp->data.width;
}
}
if (len != 0 && ((~last.flags & GRID_FLAG_CLEARED) || last.bg != 8)) {
tty_attributes(tty, &last, defaults, palette, s->hyperlinks);
if (last.flags & GRID_FLAG_CLEARED) {
log_debug("%s: %zu cleared (end)", __func__, len);
tty_clear_line(tty, defaults, aty, atx + ux, width,
last.bg);
} else {
if (!wrapped || atx != 0 || ux != 0)
tty_cursor(tty, atx + ux, aty);
tty_putn(tty, buf, len, width);
}
ux += width;
}

if (!cleared && ux < nx) {
log_debug("%s: %u to end of line (%zu cleared)", __func__,
nx - ux, len);
tty_default_attributes(tty, defaults, palette, 8,
s->hyperlinks);
tty_clear_line(tty, defaults, aty, atx + ux, nx - ux, 8);
}

tty->flags = (tty->flags & ~TTY_NOCURSOR) | flags;
tty_update_mode(tty, tty->mode, s);
}

#ifdef ENABLE_SIXEL
/* Update context for client. */
static int
tty_set_client_cb(struct tty_ctx *ttyctx, struct client *c)
{
struct window_pane *wp = ttyctx->arg;

if (c->session->curw->window != wp->window)
return (0);
if (wp->layout_cell == NULL)
return (0);

/* Set the properties relevant to the current client. */
ttyctx->bigger = tty_window_offset(&c->tty, &ttyctx->wox, &ttyctx->woy,
&ttyctx->wsx, &ttyctx->wsy);

ttyctx->yoff = ttyctx->ryoff = wp->yoff;
if (status_at_line(c) == 0)
ttyctx->yoff += status_line_size(c);

return (1);
}

void
tty_draw_images(struct client *c, struct window_pane *wp, struct screen *s)
{
struct image *im;
struct tty_ctx ttyctx;

TAILQ_FOREACH(im, &s->images, entry) {
memset(&ttyctx, 0, sizeof ttyctx);

/* Set the client independent properties. */
ttyctx.ocx = im->px;
ttyctx.ocy = im->py;

ttyctx.orlower = s->rlower;
ttyctx.orupper = s->rupper;

ttyctx.xoff = ttyctx.rxoff = wp->xoff;
ttyctx.sx = wp->sx;
ttyctx.sy = wp->sy;

ttyctx.ptr = im;
ttyctx.arg = wp;
ttyctx.set_client_cb = tty_set_client_cb;
ttyctx.allow_invisible_panes = 1;
tty_write_one(tty_cmd_sixelimage, c, &ttyctx);
}
}
#endif

void
tty_sync_start(struct tty *tty)
{
if (tty->flags & TTY_BLOCK)
return;
if (tty->flags & TTY_SYNCING)
return;
tty->flags |= TTY_SYNCING;

if (tty_term_has(tty->term, TTYC_SYNC)) {
log_debug("%s sync start", tty->client->name);
tty_putcode_i(tty, TTYC_SYNC, 1);
}
}

void
tty_sync_end(struct tty *tty)
{
if (tty->flags & TTY_BLOCK)
return;
if (~tty->flags & TTY_SYNCING)
return;
tty->flags &= ~TTY_SYNCING;

if (tty_term_has(tty->term, TTYC_SYNC)) {
log_debug("%s sync end", tty->client->name);
tty_putcode_i(tty, TTYC_SYNC, 2);
}
}

static int
tty_client_ready(const struct tty_ctx *ctx, struct client *c)
{
if (c->session == NULL || c->tty.term == NULL)
return (0);
if (c->flags & CLIENT_SUSPENDED)
return (0);

/*
* If invisible panes are allowed (used for passthrough), don't care if
* redrawing or frozen.
*/
if (ctx->allow_invisible_panes)
return (1);

if (c->flags & CLIENT_REDRAWWINDOW)
return (0);
if (c->tty.flags & TTY_FREEZE)
return (0);
return (1);
}

void
tty_write(void (*cmdfn)(struct tty *, const struct tty_ctx *),
struct tty_ctx *ctx)
{
struct client *c;
int state;

if (ctx->set_client_cb == NULL)
return;
TAILQ_FOREACH(c, &clients, entry) {
if (tty_client_ready(ctx, c)) {
state = ctx->set_client_cb(ctx, c);
if (state == -1)
break;
if (state == 0)
continue;
cmdfn(&c->tty, ctx);
}
}
}

#ifdef ENABLE_SIXEL
/* Only write to the incoming tty instead of every client. */
static void
tty_write_one(void (*cmdfn)(struct tty *, const struct tty_ctx *),
struct client *c, struct tty_ctx *ctx)
{
if (ctx->set_client_cb == NULL)
return;
if ((ctx->set_client_cb(ctx, c)) == 1)
cmdfn(&c->tty, ctx);
}
#endif

void
tty_cmd_insertcharacter(struct tty *tty, const struct tty_ctx *ctx)
{
struct client *c = tty->client;

if (ctx->bigger ||
!tty_full_width(tty, ctx) ||
tty_fake_bce(tty, &ctx->defaults, ctx->bg) ||
(!tty_term_has(tty->term, TTYC_ICH) &&
!tty_term_has(tty->term, TTYC_ICH1)) ||
c->overlay_check != NULL) {
tty_draw_pane(tty, ctx, ctx->ocy);
return;
}

tty_default_attributes(tty, &ctx->defaults, ctx->palette, ctx->bg,
ctx->s->hyperlinks);

tty_cursor_pane(tty, ctx, ctx->ocx, ctx->ocy);

tty_emulate_repeat(tty, TTYC_ICH, TTYC_ICH1, ctx->num);
}

void
tty_cmd_deletecharacter(struct tty *tty, const struct tty_ctx *ctx)
{
struct client *c = tty->client;

if (ctx->bigger ||
!tty_full_width(tty, ctx) ||
tty_fake_bce(tty, &ctx->defaults, ctx->bg) ||
(!tty_term_has(tty->term, TTYC_DCH) &&
!tty_term_has(tty->term, TTYC_DCH1)) ||
c->overlay_check != NULL) {
tty_draw_pane(tty, ctx, ctx->ocy);
return;
}

tty_default_attributes(tty, &ctx->defaults, ctx->palette, ctx->bg,
ctx->s->hyperlinks);

tty_cursor_pane(tty, ctx, ctx->ocx, ctx->ocy);

tty_emulate_repeat(tty, TTYC_DCH, TTYC_DCH1, ctx->num);
}

void
tty_cmd_clearcharacter(struct tty *tty, const struct tty_ctx *ctx)
{
tty_default_attributes(tty, &ctx->defaults, ctx->palette, ctx->bg,
ctx->s->hyperlinks);

tty_clear_pane_line(tty, ctx, ctx->ocy, ctx->ocx, ctx->num, ctx->bg);
}

void
tty_cmd_insertline(struct tty *tty, const struct tty_ctx *ctx)
{
struct client *c = tty->client;

if (ctx->bigger ||
!tty_full_width(tty, ctx) ||
tty_fake_bce(tty, &ctx->defaults, ctx->bg) ||
!tty_term_has(tty->term, TTYC_CSR) ||
!tty_term_has(tty->term, TTYC_IL1) ||
ctx->sx == 1 ||
ctx->sy == 1 ||
c->overlay_check != NULL) {
tty_redraw_region(tty, ctx);
return;
}

tty_default_attributes(tty, &ctx->defaults, ctx->palette, ctx->bg,
ctx->s->hyperlinks);

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

tty_emulate_repeat(tty, TTYC_IL, TTYC_IL1, ctx->num);
tty->cx = tty->cy = UINT_MAX;
}

void
tty_cmd_deleteline(struct tty *tty, const struct tty_ctx *ctx)
{
struct client *c = tty->client;

if (ctx->bigger ||
!tty_full_width(tty, ctx) ||
tty_fake_bce(tty, &ctx->defaults, ctx->bg) ||
!tty_term_has(tty->term, TTYC_CSR) ||
!tty_term_has(tty->term, TTYC_DL1) ||
ctx->sx == 1 ||
ctx->sy == 1 ||
c->overlay_check != NULL) {
tty_redraw_region(tty, ctx);
return;
}

tty_default_attributes(tty, &ctx->defaults, ctx->palette, ctx->bg,
ctx->s->hyperlinks);

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

tty_emulate_repeat(tty, TTYC_DL, TTYC_DL1, ctx->num);
tty->cx = tty->cy = UINT_MAX;
}

void
tty_cmd_clearline(struct tty *tty, const struct tty_ctx *ctx)
{
tty_default_attributes(tty, &ctx->defaults, ctx->palette, ctx->bg,
ctx->s->hyperlinks);

tty_clear_pane_line(tty, ctx, ctx->ocy, 0, ctx->sx, ctx->bg);
}

void
tty_cmd_clearendofline(struct tty *tty, const struct tty_ctx *ctx)
{
u_int nx = ctx->sx - ctx->ocx;

tty_default_attributes(tty, &ctx->defaults, ctx->palette, ctx->bg,
ctx->s->hyperlinks);

tty_clear_pane_line(tty, ctx, ctx->ocy, ctx->ocx, nx, ctx->bg);
}

void
tty_cmd_clearstartofline(struct tty *tty, const struct tty_ctx *ctx)
{
tty_default_attributes(tty, &ctx->defaults, ctx->palette, ctx->bg,
ctx->s->hyperlinks);

tty_clear_pane_line(tty, ctx, ctx->ocy, 0, ctx->ocx + 1, ctx->bg);
}

void
tty_cmd_reverseindex(struct tty *tty, const struct tty_ctx *ctx)
{
struct client *c = tty->client;

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

if (ctx->bigger ||
(!tty_full_width(tty, ctx) && !tty_use_margin(tty)) ||
tty_fake_bce(tty, &ctx->defaults, 8) ||
!tty_term_has(tty->term, TTYC_CSR) ||
(!tty_term_has(tty->term, TTYC_RI) &&
!tty_term_has(tty->term, TTYC_RIN)) ||
ctx->sx == 1 ||
ctx->sy == 1 ||
c->overlay_check != NULL) {
tty_redraw_region(tty, ctx);
return;
}

tty_default_attributes(tty, &ctx->defaults, ctx->palette, ctx->bg,
ctx->s->hyperlinks);

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

if (tty_term_has(tty->term, TTYC_RI))
tty_putcode(tty, TTYC_RI);
else
tty_putcode_i(tty, TTYC_RIN, 1);
}

void
tty_cmd_linefeed(struct tty *tty, const struct tty_ctx *ctx)
{
struct client *c = tty->client;

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

if (ctx->bigger ||
(!tty_full_width(tty, ctx) && !tty_use_margin(tty)) ||
tty_fake_bce(tty, &ctx->defaults, 8) ||
!tty_term_has(tty->term, TTYC_CSR) ||
ctx->sx == 1 ||
ctx->sy == 1 ||
c->overlay_check != NULL) {
tty_redraw_region(tty, ctx);
return;
}

tty_default_attributes(tty, &ctx->defaults, ctx->palette, ctx->bg,
ctx->s->hyperlinks);

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

/*
* If we want to wrap a pane while using margins, the cursor needs to
* be exactly on the right of the region. If the cursor is entirely off
* the edge - move it back to the right. Some terminals are funny about
* this and insert extra spaces, so only use the right if margins are
* enabled.
*/
if (ctx->xoff + ctx->ocx > tty->rright) {
if (!tty_use_margin(tty))
tty_cursor(tty, 0, ctx->yoff + ctx->ocy);
else
tty_cursor(tty, tty->rright, ctx->yoff + ctx->ocy);
} else
tty_cursor_pane(tty, ctx, ctx->ocx, ctx->ocy);

tty_putc(tty, '\n');
}

void
tty_cmd_scrollup(struct tty *tty, const struct tty_ctx *ctx)
{
struct client *c = tty->client;
u_int i;

if (ctx->bigger ||
(!tty_full_width(tty, ctx) && !tty_use_margin(tty)) ||
tty_fake_bce(tty, &ctx->defaults, 8) ||
!tty_term_has(tty->term, TTYC_CSR) ||
ctx->sx == 1 ||
ctx->sy == 1 ||
c->overlay_check != NULL) {
tty_redraw_region(tty, ctx);
return;
}

tty_default_attributes(tty, &ctx->defaults, ctx->palette, ctx->bg,
ctx->s->hyperlinks);

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

if (ctx->num == 1 || !tty_term_has(tty->term, TTYC_INDN)) {
if (!tty_use_margin(tty))
tty_cursor(tty, 0, tty->rlower);
else
tty_cursor(tty, tty->rright, tty->rlower);
for (i = 0; i < ctx->num; i++)
tty_putc(tty, '\n');
} else {
if (tty->cy == UINT_MAX)
tty_cursor(tty, 0, 0);
else
tty_cursor(tty, 0, tty->cy);
tty_putcode_i(tty, TTYC_INDN, ctx->num);
}
}

void
tty_cmd_scrolldown(struct tty *tty, const struct tty_ctx *ctx)
{
u_int i;
struct client *c = tty->client;

if (ctx->bigger ||
(!tty_full_width(tty, ctx) && !tty_use_margin(tty)) ||
tty_fake_bce(tty, &ctx->defaults, 8) ||
!tty_term_has(tty->term, TTYC_CSR) ||
(!tty_term_has(tty->term, TTYC_RI) &&
!tty_term_has(tty->term, TTYC_RIN)) ||
ctx->sx == 1 ||
ctx->sy == 1 ||
c->overlay_check != NULL) {
tty_redraw_region(tty, ctx);
return;
}

tty_default_attributes(tty, &ctx->defaults, ctx->palette, ctx->bg,
ctx->s->hyperlinks);

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

if (tty_term_has(tty->term, TTYC_RIN))
tty_putcode_i(tty, TTYC_RIN, ctx->num);
else {
for (i = 0; i < ctx->num; i++)
tty_putcode(tty, TTYC_RI);
}
}

void
tty_cmd_clearendofscreen(struct tty *tty, const struct tty_ctx *ctx)
{
u_int px, py, nx, ny;

tty_default_attributes(tty, &ctx->defaults, ctx->palette, ctx->bg,
ctx->s->hyperlinks);

tty_region_pane(tty, ctx, 0, ctx->sy - 1);
tty_margin_off(tty);

px = 0;
nx = ctx->sx;
py = ctx->ocy + 1;
ny = ctx->sy - ctx->ocy - 1;

tty_clear_pane_area(tty, ctx, py, ny, px, nx, ctx->bg);

px = ctx->ocx;
nx = ctx->sx - ctx->ocx;
py = ctx->ocy;

tty_clear_pane_line(tty, ctx, py, px, nx, ctx->bg);
}

void
tty_cmd_clearstartofscreen(struct tty *tty, const struct tty_ctx *ctx)
{
u_int px, py, nx, ny;

tty_default_attributes(tty, &ctx->defaults, ctx->palette, ctx->bg,
ctx->s->hyperlinks);

tty_region_pane(tty, ctx, 0, ctx->sy - 1);
tty_margin_off(tty);

px = 0;
nx = ctx->sx;
py = 0;
ny = ctx->ocy;

tty_clear_pane_area(tty, ctx, py, ny, px, nx, ctx->bg);

px = 0;
nx = ctx->ocx + 1;
py = ctx->ocy;

tty_clear_pane_line(tty, ctx, py, px, nx, ctx->bg);
}

void
tty_cmd_clearscreen(struct tty *tty, const struct tty_ctx *ctx)
{
u_int px, py, nx, ny;

tty_default_attributes(tty, &ctx->defaults, ctx->palette, ctx->bg,
ctx->s->hyperlinks);

tty_region_pane(tty, ctx, 0, ctx->sy - 1);
tty_margin_off(tty);

px = 0;
nx = ctx->sx;
py = 0;
ny = ctx->sy;

tty_clear_pane_area(tty, ctx, py, ny, px, nx, ctx->bg);
}

void
tty_cmd_alignmenttest(struct tty *tty, const struct tty_ctx *ctx)
{
u_int i, j;

if (ctx->bigger) {
ctx->redraw_cb(ctx);
return;
}

tty_attributes(tty, &grid_default_cell, &ctx->defaults, ctx->palette,
ctx->s->hyperlinks);

tty_region_pane(tty, ctx, 0, ctx->sy - 1);
tty_margin_off(tty);

for (j = 0; j < ctx->sy; j++) {
tty_cursor_pane(tty, ctx, 0, j);
for (i = 0; i < ctx->sx; i++)
tty_putc(tty, 'E');
}
}

void
tty_cmd_cell(struct tty *tty, const struct tty_ctx *ctx)
{
const struct grid_cell *gcp = ctx->cell;
struct screen *s = ctx->s;
struct overlay_ranges r;
u_int px, py, i, vis = 0;

px = ctx->xoff + ctx->ocx - ctx->wox;
py = ctx->yoff + ctx->ocy - ctx->woy;
if (!tty_is_visible(tty, ctx, ctx->ocx, ctx->ocy, 1, 1) ||
(gcp->data.width == 1 && !tty_check_overlay(tty, px, py)))
return;

/* Handle partially obstructed wide characters. */
if (gcp->data.width > 1) {
tty_check_overlay_range(tty, px, py, gcp->data.width, &r);
for (i = 0; i < OVERLAY_MAX_RANGES; i++)
vis += r.nx[i];
if (vis < gcp->data.width) {
tty_draw_line(tty, s, s->cx, s->cy, gcp->data.width,
px, py, &ctx->defaults, ctx->palette);
return;
}
}

if (ctx->xoff + ctx->ocx - ctx->wox > tty->sx - 1 &&
ctx->ocy == ctx->orlower &&
tty_full_width(tty, ctx))
tty_region_pane(tty, ctx, ctx->orupper, ctx->orlower);

tty_margin_off(tty);
tty_cursor_pane_unless_wrap(tty, ctx, ctx->ocx, ctx->ocy);

tty_cell(tty, ctx->cell, &ctx->defaults, ctx->palette,
ctx->s->hyperlinks);

if (ctx->num == 1)
tty_invalidate(tty);
}

void
tty_cmd_cells(struct tty *tty, const struct tty_ctx *ctx)
{
struct overlay_ranges r;
u_int i, px, py, cx;
char *cp = ctx->ptr;

if (!tty_is_visible(tty, ctx, ctx->ocx, ctx->ocy, ctx->num, 1))
return;

if (ctx->bigger &&
(ctx->xoff + ctx->ocx < ctx->wox ||
ctx->xoff + ctx->ocx + ctx->num > ctx->wox + ctx->wsx)) {
if (!ctx->wrapped ||
!tty_full_width(tty, ctx) ||
(tty->term->flags & TERM_NOAM) ||
ctx->xoff + ctx->ocx != 0 ||
ctx->yoff + ctx->ocy != tty->cy + 1 ||
tty->cx < tty->sx ||
tty->cy == tty->rlower)
tty_draw_pane(tty, ctx, ctx->ocy);
else
ctx->redraw_cb(ctx);
return;
}

tty_margin_off(tty);
tty_cursor_pane_unless_wrap(tty, ctx, ctx->ocx, ctx->ocy);
tty_attributes(tty, ctx->cell, &ctx->defaults, ctx->palette, ctx->s->hyperlinks);

/* Get tty position from pane position for overlay check. */
px = ctx->xoff + ctx->ocx - ctx->wox;
py = ctx->yoff + ctx->ocy - ctx->woy;

tty_check_overlay_range(tty, px, py, ctx->num, &r);
for (i = 0; i < OVERLAY_MAX_RANGES; i++) {
if (r.nx[i] == 0)
continue;
/* Convert back to pane position for printing. */
cx = r.px[i] - ctx->xoff + ctx->wox;
tty_cursor_pane_unless_wrap(tty, ctx, cx, ctx->ocy);
tty_putn(tty, cp + r.px[i] - px, r.nx[i], r.nx[i]);
}
}

void
tty_cmd_setselection(struct tty *tty, const struct tty_ctx *ctx)
{
tty_set_selection(tty, ctx->ptr2, ctx->ptr, ctx->num);
}

void
tty_set_selection(struct tty *tty, const char *flags, const char *buf,
size_t len)
{
char *encoded;
size_t size;

if (~tty->flags & TTY_STARTED)
return;
if (!tty_term_has(tty->term, TTYC_MS))
return;

size = 4 * ((len + 2) / 3) + 1; /* storage for base64 */
encoded = xmalloc(size);

b64_ntop(buf, len, encoded, size);
tty->flags |= TTY_NOBLOCK;
tty_putcode_ss(tty, TTYC_MS, flags, encoded);

free(encoded);
}

void
tty_cmd_rawstring(struct tty *tty, const struct tty_ctx *ctx)
{
tty->flags |= TTY_NOBLOCK;
tty_add(tty, ctx->ptr, ctx->num);
tty_invalidate(tty);
}

#ifdef ENABLE_SIXEL
void
tty_cmd_sixelimage(struct tty *tty, const struct tty_ctx *ctx)
{
struct image *im = ctx->ptr;
struct sixel_image *si = im->data;
struct sixel_image *new;
char *data;
size_t size;
u_int cx = ctx->ocx, cy = ctx->ocy, sx, sy;
u_int i, j, x, y, rx, ry;
int fallback = 0;

if ((~tty->term->flags & TERM_SIXEL) &&
!tty_term_has(tty->term, TTYC_SXL))
fallback = 1;
if (tty->xpixel == 0 || tty->ypixel == 0)
fallback = 1;

sixel_size_in_cells(si, &sx, &sy);
log_debug("%s: image is %ux%u", __func__, sx, sy);
if (!tty_clamp_area(tty, ctx, cx, cy, sx, sy, &i, &j, &x, &y, &rx, &ry))
return;
log_debug("%s: clamping to %u,%u-%u,%u", __func__, i, j, rx, ry);

if (fallback == 1) {
data = xstrdup(im->fallback);
size = strlen(data);
} else {
new = sixel_scale(si, tty->xpixel, tty->ypixel, i, j, rx, ry, 0);
if (new == NULL)
return;

data = sixel_print(new, si, &size);
}
if (data != NULL) {
log_debug("%s: %zu bytes: %s", __func__, size, data);
tty_region_off(tty);
tty_margin_off(tty);
tty_cursor(tty, x, y);

tty->flags |= TTY_NOBLOCK;
tty_add(tty, data, size);
tty_invalidate(tty);
free(data);
}

if (fallback == 0)
sixel_free(new);
}
#endif

void
tty_cmd_syncstart(struct tty *tty, const struct tty_ctx *ctx)
{
if (ctx->num == 0x11) {
/*
* This is an overlay and a command that moves the cursor so
* start synchronized updates.
*/
tty_sync_start(tty);
} else if (~ctx->num & 0x10) {
/*
* This is a pane. If there is an overlay, always start;
* otherwise, only if requested.
*/
if (ctx->num || tty->client->overlay_draw != NULL)
tty_sync_start(tty);
}
}

void
tty_cell(struct tty *tty, const struct grid_cell *gc,
const struct grid_cell *defaults, struct colour_palette *palette,
struct hyperlinks *hl)
{
const struct grid_cell *gcp;

/* Skip last character if terminal is stupid. */
if ((tty->term->flags & TERM_NOAM) &&
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;

/* Check the output codeset and apply attributes. */
gcp = tty_check_codeset(tty, gc);
tty_attributes(tty, gcp, defaults, palette, hl);

/* If it is a single character, write with putc to handle ACS. */
if (gcp->data.size == 1) {
tty_attributes(tty, gcp, defaults, palette, hl);
if (*gcp->data.data < 0x20 || *gcp->data.data == 0x7f)
return;
tty_putc(tty, *gcp->data.data);
return;
}

/* Write the data. */
tty_putn(tty, gcp->data.data, gcp->data.size, gcp->data.width);
}

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

if (!grid_cells_equal(gc, &grid_default_cell)) {
if (gc->link != 0)
tty_putcode_ss(tty, TTYC_HLS, "", "");
if ((gc->attr & GRID_ATTR_CHARSET) && tty_acs_needed(tty))
tty_putcode(tty, TTYC_RMACS);
tty_putcode(tty, TTYC_SGR0);
memcpy(gc, &grid_default_cell, sizeof *gc);
}
memcpy(&tty->last_cell, &grid_default_cell, sizeof tty->last_cell);
}

static void
tty_invalidate(struct tty *tty)
{
memcpy(&tty->cell, &grid_default_cell, sizeof tty->cell);
memcpy(&tty->last_cell, &grid_default_cell, sizeof tty->last_cell);

tty->cx = tty->cy = UINT_MAX;
tty->rupper = tty->rleft = UINT_MAX;
tty->rlower = tty->rright = UINT_MAX;

if (tty->flags & TTY_STARTED) {
if (tty_use_margin(tty))
tty_putcode(tty, TTYC_ENMG);
tty_putcode(tty, TTYC_SGR0);

tty->mode = ALL_MODES;
tty_update_mode(tty, MODE_CURSOR, NULL);

tty_cursor(tty, 0, 0);
tty_region_off(tty);
tty_margin_off(tty);
} else
tty->mode = MODE_CURSOR;
}

/* Turn off margin. */
void
tty_region_off(struct tty *tty)
{
tty_region(tty, 0, tty->sy - 1);
}

/* Set region inside pane. */
static void
tty_region_pane(struct tty *tty, const struct tty_ctx *ctx, u_int rupper,
u_int rlower)
{
tty_region(tty, ctx->yoff + rupper - ctx->woy,
ctx->yoff + rlower - ctx->woy);
}

/* Set region at absolute position. */
static void
tty_region(struct tty *tty, u_int rupper, u_int rlower)
{
if (tty->rlower == rlower && tty->rupper == rupper)
return;
if (!tty_term_has(tty->term, TTYC_CSR))
return;

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

/*
* Some terminals (such as PuTTY) do not correctly reset the cursor to
* 0,0 if it is beyond the last column (they do not reset their wrap
* flag so further output causes a line feed). As a workaround, do an
* explicit move to 0 first.
*/
if (tty->cx >= tty->sx) {
if (tty->cy == UINT_MAX)
tty_cursor(tty, 0, 0);
else
tty_cursor(tty, 0, tty->cy);
}

tty_putcode_ii(tty, TTYC_CSR, tty->rupper, tty->rlower);
tty->cx = tty->cy = UINT_MAX;
}

/* Turn off margin. */
void
tty_margin_off(struct tty *tty)
{
tty_margin(tty, 0, tty->sx - 1);
}

/* Set margin inside pane. */
static void
tty_margin_pane(struct tty *tty, const struct tty_ctx *ctx)
{
tty_margin(tty, ctx->xoff - ctx->wox,
ctx->xoff + ctx->sx - 1 - ctx->wox);
}

/* Set margin at absolute position. */
static void
tty_margin(struct tty *tty, u_int rleft, u_int rright)
{
if (!tty_use_margin(tty))
return;
if (tty->rleft == rleft && tty->rright == rright)
return;

tty_putcode_ii(tty, TTYC_CSR, tty->rupper, tty->rlower);

tty->rleft = rleft;
tty->rright = rright;

if (rleft == 0 && rright == tty->sx - 1)
tty_putcode(tty, TTYC_CLMG);
else
tty_putcode_ii(tty, TTYC_CMG, rleft, rright);
tty->cx = tty->cy = UINT_MAX;
}

/*
* Move the cursor, unless it would wrap itself when the next character is
* printed.
*/
static void
tty_cursor_pane_unless_wrap(struct tty *tty, const struct tty_ctx *ctx,
u_int cx, u_int cy)
{
if (!ctx->wrapped ||
!tty_full_width(tty, ctx) ||
(tty->term->flags & TERM_NOAM) ||
ctx->xoff + cx != 0 ||
ctx->yoff + cy != tty->cy + 1 ||
tty->cx < tty->sx ||
tty->cy == tty->rlower)
tty_cursor_pane(tty, ctx, cx, cy);
else
log_debug("%s: will wrap at %u,%u", __func__, tty->cx, tty->cy);
}

/* Move cursor inside pane. */
static void
tty_cursor_pane(struct tty *tty, const struct tty_ctx *ctx, u_int cx, u_int cy)
{
tty_cursor(tty, ctx->xoff + cx - ctx->wox, ctx->yoff + cy - ctx->woy);
}

/* Move cursor to absolute position. */
void
tty_cursor(struct tty *tty, u_int cx, u_int cy)
{
struct tty_term *term = tty->term;
u_int thisx, thisy;
int change;

if (tty->flags & TTY_BLOCK)
return;

thisx = tty->cx;
thisy = tty->cy;

/*
* If in the automargin space, and want to be there, do not move.
* Otherwise, force the cursor to be in range (and complain).
*/
if (cx == thisx && cy == thisy && cx == tty->sx)
return;
if (cx > tty->sx - 1) {
log_debug("%s: x too big %u > %u", __func__, cx, tty->sx - 1);
cx = tty->sx - 1;
}

/* No change. */
if (cx == thisx && cy == thisy)
return;

/* Currently at the very end of the line - use absolute movement. */
if (thisx > tty->sx - 1)
goto absolute;

/* Move to home position (0, 0). */
if (cx == 0 && cy == 0 && tty_term_has(term, TTYC_HOME)) {
tty_putcode(tty, TTYC_HOME);
goto out;
}

/* Zero on the next line. */
if (cx == 0 && cy == thisy + 1 && thisy != tty->rlower &&
(!tty_use_margin(tty) || tty->rleft == 0)) {
tty_putc(tty, '\r');
tty_putc(tty, '\n');
goto out;
}

/* Moving column or row. */
if (cy == thisy) {
/*
* Moving column only, row staying the same.
*/

/* To left edge. */
if (cx == 0 && (!tty_use_margin(tty) || tty->rleft == 0)) {
tty_putc(tty, '\r');
goto out;
}

/* One to the left. */
if (cx == thisx - 1 && tty_term_has(term, TTYC_CUB1)) {
tty_putcode(tty, TTYC_CUB1);
goto out;
}

/* One to the right. */
if (cx == thisx + 1 && tty_term_has(term, TTYC_CUF1)) {
tty_putcode(tty, TTYC_CUF1);
goto out;
}

/* Calculate difference. */
change = thisx - cx; /* +ve left, -ve right */

/*
* Use HPA if change is larger than absolute, otherwise move
* the cursor with CUB/CUF.
*/
if ((u_int) abs(change) > cx && tty_term_has(term, TTYC_HPA)) {
tty_putcode_i(tty, TTYC_HPA, cx);
goto out;
} else if (change > 0 &&
tty_term_has(term, TTYC_CUB) &&
!tty_use_margin(tty)) {
if (change == 2 && tty_term_has(term, TTYC_CUB1)) {
tty_putcode(tty, TTYC_CUB1);
tty_putcode(tty, TTYC_CUB1);
goto out;
}
tty_putcode_i(tty, TTYC_CUB, change);
goto out;
} else if (change < 0 &&
tty_term_has(term, TTYC_CUF) &&
!tty_use_margin(tty)) {
tty_putcode_i(tty, TTYC_CUF, -change);
goto out;
}
} else if (cx == thisx) {
/*
* Moving row only, column staying the same.
*/

/* One above. */
if (thisy != tty->rupper &&
cy == thisy - 1 && tty_term_has(term, TTYC_CUU1)) {
tty_putcode(tty, TTYC_CUU1);
goto out;
}

/* One below. */
if (thisy != tty->rlower &&
cy == thisy + 1 && tty_term_has(term, TTYC_CUD1)) {
tty_putcode(tty, TTYC_CUD1);
goto out;
}

/* Calculate difference. */
change = thisy - cy; /* +ve up, -ve down */

/*
* Try to use VPA if change is larger than absolute or if this
* change would cross the scroll region, otherwise use CUU/CUD.
*/
if ((u_int) abs(change) > cy ||
(change < 0 && cy - change > tty->rlower) ||
(change > 0 && cy - change < tty->rupper)) {
if (tty_term_has(term, TTYC_VPA)) {
tty_putcode_i(tty, TTYC_VPA, cy);
goto out;
}
} else if (change > 0 && tty_term_has(term, TTYC_CUU)) {
tty_putcode_i(tty, TTYC_CUU, change);
goto out;
} else if (change < 0 && tty_term_has(term, TTYC_CUD)) {
tty_putcode_i(tty, TTYC_CUD, -change);
goto out;
}
}

absolute:
/* Absolute movement. */
tty_putcode_ii(tty, TTYC_CUP, cy, cx);

out:
tty->cx = cx;
tty->cy = cy;
}

static void
tty_hyperlink(struct tty *tty, const struct grid_cell *gc,
struct hyperlinks *hl)
{
const char *uri, *id;

if (gc->link == tty->cell.link)
return;
tty->cell.link = gc->link;

if (hl == NULL)
return;

if (gc->link == 0 || !hyperlinks_get(hl, gc->link, &uri, NULL, &id))
tty_putcode_ss(tty, TTYC_HLS, "", "");
else
tty_putcode_ss(tty, TTYC_HLS, id, uri);
}

void
tty_attributes(struct tty *tty, const struct grid_cell *gc,
const struct grid_cell *defaults, struct colour_palette *palette,
struct hyperlinks *hl)
{
struct grid_cell *tc = &tty->cell, gc2;
int changed;

/* Copy cell and update default colours. */
memcpy(&gc2, gc, sizeof gc2);
if (~gc->flags & GRID_FLAG_NOPALETTE) {
if (gc2.fg == 8)
gc2.fg = defaults->fg;
if (gc2.bg == 8)
gc2.bg = defaults->bg;
}

/* Ignore cell if it is the same as the last one. */
if (gc2.attr == tty->last_cell.attr &&
gc2.fg == tty->last_cell.fg &&
gc2.bg == tty->last_cell.bg &&
gc2.us == tty->last_cell.us &&
gc2.link == tty->last_cell.link)
return;

/*
* 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.
*/
if (!tty_term_has(tty->term, TTYC_SETAB)) {
if (gc2.attr & GRID_ATTR_REVERSE) {
if (gc2.fg != 7 && !COLOUR_DEFAULT(gc2.fg))
gc2.attr &= ~GRID_ATTR_REVERSE;
} else {
if (gc2.bg != 0 && !COLOUR_DEFAULT(gc2.bg))
gc2.attr |= GRID_ATTR_REVERSE;
}
}

/* Fix up the colours if necessary. */
tty_check_fg(tty, palette, &gc2);
tty_check_bg(tty, palette, &gc2);
tty_check_us(tty, palette, &gc2);

/*
* If any bits are being cleared or the underline colour is now default,
* reset everything.
*/
if ((tc->attr & ~gc2.attr) || (tc->us != gc2.us && gc2.us == 0))
tty_reset(tty);

/*
* Set the colours. This may call tty_reset() (so it comes next) and
* may add to (NOT remove) the desired attributes.
*/
tty_colours(tty, &gc2);

/* Filter out attribute bits already set. */
changed = gc2.attr & ~tc->attr;
tc->attr = gc2.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_set_italics(tty);
if (changed & GRID_ATTR_ALL_UNDERSCORE) {
if ((changed & GRID_ATTR_UNDERSCORE) ||
!tty_term_has(tty->term, TTYC_SMULX))
tty_putcode(tty, TTYC_SMUL);
else if (changed & GRID_ATTR_UNDERSCORE_2)
tty_putcode_i(tty, TTYC_SMULX, 2);
else if (changed & GRID_ATTR_UNDERSCORE_3)
tty_putcode_i(tty, TTYC_SMULX, 3);
else if (changed & GRID_ATTR_UNDERSCORE_4)
tty_putcode_i(tty, TTYC_SMULX, 4);
else if (changed & GRID_ATTR_UNDERSCORE_5)
tty_putcode_i(tty, TTYC_SMULX, 5);
}
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_STRIKETHROUGH)
tty_putcode(tty, TTYC_SMXX);
if (changed & GRID_ATTR_OVERLINE)
tty_putcode(tty, TTYC_SMOL);
if ((changed & GRID_ATTR_CHARSET) && tty_acs_needed(tty))
tty_putcode(tty, TTYC_SMACS);

/* Set hyperlink if any. */
tty_hyperlink(tty, gc, hl);

memcpy(&tty->last_cell, &gc2, sizeof tty->last_cell);
}

static void
tty_colours(struct tty *tty, const struct grid_cell *gc)
{
struct grid_cell *tc = &tty->cell;

/* No changes? Nothing is necessary. */
if (gc->fg == tc->fg && gc->bg == tc->bg && gc->us == tc->us)
return;

/*
* Is either the default colour? This is handled specially because the
* best solution might be to reset both colours to default, in which
* case if only one is default need to fall onward to set the other
* colour.
*/
if (COLOUR_DEFAULT(gc->fg) || COLOUR_DEFAULT(gc->bg)) {
/*
* If don't have AX, send sgr0. This resets both colours to default.
* Otherwise, try to set the default colour only as needed.
*/
if (!tty_term_flag(tty->term, TTYC_AX))
tty_reset(tty);
else {
if (COLOUR_DEFAULT(gc->fg) && !COLOUR_DEFAULT(tc->fg)) {
tty_puts(tty, "\033[39m");
tc->fg = gc->fg;
}
if (COLOUR_DEFAULT(gc->bg) && !COLOUR_DEFAULT(tc->bg)) {
tty_puts(tty, "\033[49m");
tc->bg = gc->bg;
}
}
}

/* Set the foreground colour. */
if (!COLOUR_DEFAULT(gc->fg) && gc->fg != tc->fg)
tty_colours_fg(tty, gc);

/*
* Set the background colour. This must come after the foreground as
* tty_colours_fg() can call tty_reset().
*/
if (!COLOUR_DEFAULT(gc->bg) && gc->bg != tc->bg)
tty_colours_bg(tty, gc);

/* Set the underscore colour. */
if (gc->us != tc->us)
tty_colours_us(tty, gc);
}

static void
tty_check_fg(struct tty *tty, struct colour_palette *palette,
struct grid_cell *gc)
{
u_char r, g, b;
u_int colours;
int c;

/*
* Perform substitution if this pane has a palette. If the bright
* attribute is set and Nobr is not present, use the bright entry in
* the palette by changing to the aixterm colour
*/
if (~gc->flags & GRID_FLAG_NOPALETTE) {
c = gc->fg;
if (c < 8 &&
gc->attr & GRID_ATTR_BRIGHT &&
!tty_term_has(tty->term, TTYC_NOBR))
c += 90;
if ((c = colour_palette_get(palette, c)) != -1)
gc->fg = c;
}

/* Is this a 24-bit colour? */
if (gc->fg & COLOUR_FLAG_RGB) {
/* Not a 24-bit terminal? Translate to 256-colour palette. */
if (tty->term->flags & TERM_RGBCOLOURS)
return;
colour_split_rgb(gc->fg, &r, &g, &b);
gc->fg = colour_find_rgb(r, g, b);
}

/* How many colours does this terminal have? */
if (tty->term->flags & TERM_256COLOURS)
colours = 256;
else
colours = tty_term_number(tty->term, TTYC_COLORS);

/* Is this a 256-colour colour? */
if (gc->fg & COLOUR_FLAG_256) {
/* And not a 256 colour mode? */
if (colours < 256) {
gc->fg = colour_256to16(gc->fg);
if (gc->fg & 8) {
gc->fg &= 7;
if (colours >= 16)
gc->fg += 90;
}
}
return;
}

/* Is this an aixterm colour? */
if (gc->fg >= 90 && gc->fg <= 97 && colours < 16) {
gc->fg -= 90;
gc->attr |= GRID_ATTR_BRIGHT;
}
}

static void
tty_check_bg(struct tty *tty, struct colour_palette *palette,
struct grid_cell *gc)
{
u_char r, g, b;
u_int colours;
int c;

/* Perform substitution if this pane has a palette. */
if (~gc->flags & GRID_FLAG_NOPALETTE) {
if ((c = colour_palette_get(palette, gc->bg)) != -1)
gc->bg = c;
}

/* Is this a 24-bit colour? */
if (gc->bg & COLOUR_FLAG_RGB) {
/* Not a 24-bit terminal? Translate to 256-colour palette. */
if (tty->term->flags & TERM_RGBCOLOURS)
return;
colour_split_rgb(gc->bg, &r, &g, &b);
gc->bg = colour_find_rgb(r, g, b);
}

/* How many colours does this terminal have? */
if (tty->term->flags & TERM_256COLOURS)
colours = 256;
else
colours = tty_term_number(tty->term, TTYC_COLORS);

/* Is this a 256-colour colour? */
if (gc->bg & COLOUR_FLAG_256) {
/*
* And not a 256 colour mode? Translate to 16-colour
* palette. Bold background doesn't exist portably, so just
* discard the bold bit if set.
*/
if (colours < 256) {
gc->bg = colour_256to16(gc->bg);
if (gc->bg & 8) {
gc->bg &= 7;
if (colours >= 16)
gc->bg += 90;
}
}
return;
}

/* Is this an aixterm colour? */
if (gc->bg >= 90 && gc->bg <= 97 && colours < 16)
gc->bg -= 90;
}

static void
tty_check_us(__unused struct tty *tty, struct colour_palette *palette,
struct grid_cell *gc)
{
int c;

/* Perform substitution if this pane has a palette. */
if (~gc->flags & GRID_FLAG_NOPALETTE) {
if ((c = colour_palette_get(palette, gc->us)) != -1)
gc->us = c;
}

/* Convert underscore colour if only RGB can be supported. */
if (!tty_term_has(tty->term, TTYC_SETULC1)) {
if ((c = colour_force_rgb (gc->us)) == -1)
gc->us = 8;
else
gc->us = c;
}
}

static void
tty_colours_fg(struct tty *tty, const struct grid_cell *gc)
{
struct grid_cell *tc = &tty->cell;
char s[32];

/*
* If the current colour is an aixterm bright colour and the new is not,
* reset because some terminals do not clear bright correctly.
*/
if (tty->cell.fg >= 90 &&
tty->cell.bg <= 97 &&
(gc->fg < 90 || gc->fg > 97))
tty_reset(tty);

/* Is this a 24-bit or 256-colour colour? */
if (gc->fg & COLOUR_FLAG_RGB || gc->fg & COLOUR_FLAG_256) {
if (tty_try_colour(tty, gc->fg, "38") == 0)
goto save;
/* Should not get here, already converted in tty_check_fg. */
return;
}

/* Is this an aixterm bright colour? */
if (gc->fg >= 90 && gc->fg <= 97) {
if (tty->term->flags & TERM_256COLOURS) {
xsnprintf(s, sizeof s, "\033[%dm", gc->fg);
tty_puts(tty, s);
} else
tty_putcode_i(tty, TTYC_SETAF, gc->fg - 90 + 8);
goto save;
}

/* Otherwise set the foreground colour. */
tty_putcode_i(tty, TTYC_SETAF, gc->fg);

save:
/* Save the new values in the terminal current cell. */
tc->fg = gc->fg;
}

static void
tty_colours_bg(struct tty *tty, const struct grid_cell *gc)
{
struct grid_cell *tc = &tty->cell;
char s[32];

/* Is this a 24-bit or 256-colour colour? */
if (gc->bg & COLOUR_FLAG_RGB || gc->bg & COLOUR_FLAG_256) {
if (tty_try_colour(tty, gc->bg, "48") == 0)
goto save;
/* Should not get here, already converted in tty_check_bg. */
return;
}

/* Is this an aixterm bright colour? */
if (gc->bg >= 90 && gc->bg <= 97) {
if (tty->term->flags & TERM_256COLOURS) {
xsnprintf(s, sizeof s, "\033[%dm", gc->bg + 10);
tty_puts(tty, s);
} else
tty_putcode_i(tty, TTYC_SETAB, gc->bg - 90 + 8);
goto save;
}

/* Otherwise set the background colour. */
tty_putcode_i(tty, TTYC_SETAB, gc->bg);

save:
/* Save the new values in the terminal current cell. */
tc->bg = gc->bg;
}

static void
tty_colours_us(struct tty *tty, const struct grid_cell *gc)
{
struct grid_cell *tc = &tty->cell;
u_int c;
u_char r, g, b;

/* Clear underline colour. */
if (COLOUR_DEFAULT(gc->us)) {
tty_putcode(tty, TTYC_OL);
goto save;
}

/*
* If this is not an RGB colour, use Setulc1 if it exists, otherwise
* convert.
*/
if (~gc->us & COLOUR_FLAG_RGB) {
c = gc->us;
if ((~c & COLOUR_FLAG_256) && (c >= 90 && c <= 97))
c -= 82;
tty_putcode_i(tty, TTYC_SETULC1, c & ~COLOUR_FLAG_256);
return;
}

/*
* Setulc and setal follows the ncurses(3) one argument "direct colour"
* capability format. Calculate the colour value.
*/
colour_split_rgb(gc->us, &r, &g, &b);
c = (65536 * r) + (256 * g) + b;

/*
* Write the colour. Only use setal if the RGB flag is set because the
* non-RGB version may be wrong.
*/
if (tty_term_has(tty->term, TTYC_SETULC))
tty_putcode_i(tty, TTYC_SETULC, c);
else if (tty_term_has(tty->term, TTYC_SETAL) &&
tty_term_has(tty->term, TTYC_RGB))
tty_putcode_i(tty, TTYC_SETAL, c);

save:
/* Save the new values in the terminal current cell. */
tc->us = gc->us;
}

static int
tty_try_colour(struct tty *tty, int colour, const char *type)
{
u_char r, g, b;

if (colour & COLOUR_FLAG_256) {
if (*type == '3' && tty_term_has(tty->term, TTYC_SETAF))
tty_putcode_i(tty, TTYC_SETAF, colour & 0xff);
else if (tty_term_has(tty->term, TTYC_SETAB))
tty_putcode_i(tty, TTYC_SETAB, colour & 0xff);
return (0);
}

if (colour & COLOUR_FLAG_RGB) {
colour_split_rgb(colour & 0xffffff, &r, &g, &b);
if (*type == '3' && tty_term_has(tty->term, TTYC_SETRGBF))
tty_putcode_iii(tty, TTYC_SETRGBF, r, g, b);
else if (tty_term_has(tty->term, TTYC_SETRGBB))
tty_putcode_iii(tty, TTYC_SETRGBB, r, g, b);
return (0);
}

return (-1);
}

static void
tty_window_default_style(struct grid_cell *gc, struct window_pane *wp)
{
memcpy(gc, &grid_default_cell, sizeof *gc);
gc->fg = wp->palette.fg;
gc->bg = wp->palette.bg;
}

void
tty_default_colours(struct grid_cell *gc, struct window_pane *wp)
{
struct options *oo = wp->options;
struct format_tree *ft;

memcpy(gc, &grid_default_cell, sizeof *gc);

if (wp->flags & PANE_STYLECHANGED) {
log_debug("%%%u: style changed", wp->id);
wp->flags &= ~PANE_STYLECHANGED;

ft = format_create(NULL, NULL, FORMAT_PANE|wp->id,
FORMAT_NOJOBS);
format_defaults(ft, NULL, NULL, NULL, wp);
tty_window_default_style(&wp->cached_active_gc, wp);
style_add(&wp->cached_active_gc, oo, "window-active-style", ft);
tty_window_default_style(&wp->cached_gc, wp);
style_add(&wp->cached_gc, oo, "window-style", ft);
format_free(ft);
}

if (gc->fg == 8) {
if (wp == wp->window->active && wp->cached_active_gc.fg != 8)
gc->fg = wp->cached_active_gc.fg;
else
gc->fg = wp->cached_gc.fg;
}

if (gc->bg == 8) {
if (wp == wp->window->active && wp->cached_active_gc.bg != 8)
gc->bg = wp->cached_active_gc.bg;
else
gc->bg = wp->cached_gc.bg;
}
}

static void
tty_default_attributes(struct tty *tty, const struct grid_cell *defaults,
struct colour_palette *palette, u_int bg, struct hyperlinks *hl)
{
struct grid_cell gc;

memcpy(&gc, &grid_default_cell, sizeof gc);
gc.bg = bg;
tty_attributes(tty, &gc, defaults, palette, hl);
}

static void
tty_clipboard_query_callback(__unused int fd, __unused short events, void *data)
{
struct tty *tty = data;
struct client *c = tty->client;

c->flags &= ~CLIENT_CLIPBOARDBUFFER;
free(c->clipboard_panes);
c->clipboard_panes = NULL;
c->clipboard_npanes = 0;

tty->flags &= ~TTY_OSC52QUERY;
}

void
tty_clipboard_query(struct tty *tty)
{
struct timeval tv = { .tv_sec = TTY_QUERY_TIMEOUT };

if ((~tty->flags & TTY_STARTED) || (tty->flags & TTY_OSC52QUERY))
return;
tty_putcode_ss(tty, TTYC_MS, "", "?");

tty->flags |= TTY_OSC52QUERY;
evtimer_set(&tty->clipboard_timer, tty_clipboard_query_callback, tty);
evtimer_add(&tty->clipboard_timer, &tv);
}