input-keys.c - tmux - Rivoreo Source Code Repositories

 /* $OpenBSD$ */

 /*
  * Copyright (c) 2007 Nicholas Marriott <nicholas.marriott@gmail.com>
  *
  * 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 <stdlib.h>
 #include <string.h>

 #include "tmux.h"

 /*
  * This file is rather misleadingly named, it contains the code which takes a
  * key code and translates it into something suitable to be sent to the
  * application running in a pane (similar to input.c does in the other
  * direction with output).
  */

 static void	 input_key_mouse(struct window_pane *, struct mouse_event *);

 struct input_key_ent {
 	key_code	 key;
 	const char	*data;

 	int		 flags;
 #define INPUTKEY_KEYPAD 0x1	/* keypad key */
 #define INPUTKEY_CURSOR 0x2	/* cursor key */
 };

 static const struct input_key_ent input_keys[] = {
 	/* Backspace key. */
 	{ KEYC_BSPACE,		"\177",		0 },

 	/* Function keys. */
 	{ KEYC_F1,		"\033OP",	0 },
 	{ KEYC_F2,		"\033OQ",	0 },
 	{ KEYC_F3,		"\033OR",	0 },
 	{ KEYC_F4,		"\033OS",	0 },
 	{ KEYC_F5,		"\033[15~",	0 },
 	{ KEYC_F6,		"\033[17~",	0 },
 	{ KEYC_F7,		"\033[18~",	0 },
 	{ KEYC_F8,		"\033[19~",	0 },
 	{ KEYC_F9,		"\033[20~",	0 },
 	{ KEYC_F10,		"\033[21~",	0 },
 	{ KEYC_F11,		"\033[23~",	0 },
 	{ KEYC_F12,		"\033[24~",	0 },
 	{ KEYC_F1|KEYC_SHIFT,	"\033[25~",	0 },
 	{ KEYC_F2|KEYC_SHIFT,	"\033[26~",	0 },
 	{ KEYC_F3|KEYC_SHIFT,	"\033[28~",	0 },
 	{ KEYC_F4|KEYC_SHIFT,	"\033[29~",	0 },
 	{ KEYC_F5|KEYC_SHIFT,	"\033[31~",	0 },
 	{ KEYC_F6|KEYC_SHIFT,	"\033[32~",	0 },
 	{ KEYC_F7|KEYC_SHIFT,	"\033[33~",	0 },
 	{ KEYC_F8|KEYC_SHIFT,	"\033[34~",	0 },
 	{ KEYC_IC,		"\033[2~",	0 },
 	{ KEYC_DC,		"\033[3~",	0 },
 	{ KEYC_HOME,		"\033[1~",	0 },
 	{ KEYC_END,		"\033[4~",	0 },
 	{ KEYC_NPAGE,		"\033[6~",	0 },
 	{ KEYC_PPAGE,		"\033[5~",	0 },
 	{ KEYC_BTAB,		"\033[Z",	0 },

 	/*
 	 * Arrow keys. Cursor versions must come first. The codes are toggled
 	 * between CSI and SS3 versions when ctrl is pressed.
 	 */
 	{ KEYC_UP|KEYC_CTRL,	"\033[A",	INPUTKEY_CURSOR },
 	{ KEYC_DOWN|KEYC_CTRL,	"\033[B",	INPUTKEY_CURSOR },
 	{ KEYC_RIGHT|KEYC_CTRL,	"\033[C",	INPUTKEY_CURSOR },
 	{ KEYC_LEFT|KEYC_CTRL,	"\033[D",	INPUTKEY_CURSOR },

 	{ KEYC_UP,		"\033OA",	INPUTKEY_CURSOR },
 	{ KEYC_DOWN,		"\033OB",	INPUTKEY_CURSOR },
 	{ KEYC_RIGHT,		"\033OC",	INPUTKEY_CURSOR },
 	{ KEYC_LEFT,		"\033OD",	INPUTKEY_CURSOR },

 	{ KEYC_UP|KEYC_CTRL,	"\033OA",	0 },
 	{ KEYC_DOWN|KEYC_CTRL,	"\033OB",	0 },
 	{ KEYC_RIGHT|KEYC_CTRL,	"\033OC",	0 },
 	{ KEYC_LEFT|KEYC_CTRL,	"\033OD",	0 },

 	{ KEYC_UP,		"\033[A",	0 },
 	{ KEYC_DOWN,		"\033[B",	0 },
 	{ KEYC_RIGHT,		"\033[C",	0 },
 	{ KEYC_LEFT,		"\033[D",	0 },

 	/* Keypad keys. Keypad versions must come first. */
 	{ KEYC_KP_SLASH,	"\033Oo",	INPUTKEY_KEYPAD },
 	{ KEYC_KP_STAR,		"\033Oj",	INPUTKEY_KEYPAD },
 	{ KEYC_KP_MINUS,	"\033Om",	INPUTKEY_KEYPAD },
 	{ KEYC_KP_SEVEN,	"\033Ow",	INPUTKEY_KEYPAD },
 	{ KEYC_KP_EIGHT,	"\033Ox",	INPUTKEY_KEYPAD },
 	{ KEYC_KP_NINE,		"\033Oy",	INPUTKEY_KEYPAD },
 	{ KEYC_KP_PLUS,		"\033Ok",	INPUTKEY_KEYPAD },
 	{ KEYC_KP_FOUR,		"\033Ot",	INPUTKEY_KEYPAD },
 	{ KEYC_KP_FIVE,		"\033Ou",	INPUTKEY_KEYPAD },
 	{ KEYC_KP_SIX,		"\033Ov",	INPUTKEY_KEYPAD },
 	{ KEYC_KP_ONE,		"\033Oq",	INPUTKEY_KEYPAD },
 	{ KEYC_KP_TWO,		"\033Or",	INPUTKEY_KEYPAD },
 	{ KEYC_KP_THREE,	"\033Os",	INPUTKEY_KEYPAD },
 	{ KEYC_KP_ENTER,	"\033OM",	INPUTKEY_KEYPAD },
 	{ KEYC_KP_ZERO,		"\033Op",	INPUTKEY_KEYPAD },
 	{ KEYC_KP_PERIOD,	"\033On",	INPUTKEY_KEYPAD },

 	{ KEYC_KP_SLASH,	"/",		0 },
 	{ KEYC_KP_STAR,		"*",		0 },
 	{ KEYC_KP_MINUS,	"-",		0 },
 	{ KEYC_KP_SEVEN,	"7",		0 },
 	{ KEYC_KP_EIGHT,	"8",		0 },
 	{ KEYC_KP_NINE,		"9",		0 },
 	{ KEYC_KP_PLUS,		"+",		0 },
 	{ KEYC_KP_FOUR,		"4",		0 },
 	{ KEYC_KP_FIVE,		"5",		0 },
 	{ KEYC_KP_SIX,		"6",		0 },
 	{ KEYC_KP_ONE,		"1",		0 },
 	{ KEYC_KP_TWO,		"2",		0 },
 	{ KEYC_KP_THREE,	"3",		0 },
 	{ KEYC_KP_ENTER,	"\n",		0 },
 	{ KEYC_KP_ZERO,		"0",		0 },
 	{ KEYC_KP_PERIOD,	".",		0 },
 };

 /* Split a character into two UTF-8 bytes. */
 static size_t
 input_split2(u_int c, u_char *dst)
 {
 	if (c > 0x7f) {
 		dst[0] = (c >> 6) | 0xc0;
 		dst[1] = (c & 0x3f) | 0x80;
 		return (2);
 	}
 	dst[0] = c;
 	return (1);
 }

 /* Translate a key code into an output key sequence. */
 void
 input_key(struct window_pane *wp, key_code key, struct mouse_event *m)
 {
 	const struct input_key_ent	*ike;
 	u_int				 i;
 	size_t				 dlen;
 	char				*out;
 	key_code			 justkey;
 	struct utf8_data		 ud;

 	log_debug("writing key 0x%llx (%s) to %%%u", key,
 	    key_string_lookup_key(key), wp->id);

 	/* If this is a mouse key, pass off to mouse function. */
 	if (KEYC_IS_MOUSE(key)) {
 		if (m != NULL && m->wp != -1 && (u_int)m->wp == wp->id)
 			input_key_mouse(wp, m);
 		return;
 	}

 	/*
 	 * If this is a normal 7-bit key, just send it, with a leading escape
 	 * if necessary. If it is a UTF-8 key, split it and send it.
 	 */
 	justkey = (key & ~KEYC_ESCAPE);
 	if (justkey <= 0x7f) {
 		if (key & KEYC_ESCAPE)
 			bufferevent_write(wp->event, "\033", 1);
 		ud.data[0] = justkey;
 		bufferevent_write(wp->event, &ud.data[0], 1);
 		return;
 	}
 	if (justkey > 0x7f && justkey < KEYC_BASE) {
 		if (utf8_split(justkey, &ud) != UTF8_DONE)
 			return;
 		if (key & KEYC_ESCAPE)
 			bufferevent_write(wp->event, "\033", 1);
 		bufferevent_write(wp->event, ud.data, ud.size);
 		return;
 	}

 	/*
 	 * Then try to look this up as an xterm key, if the flag to output them
 	 * is set.
 	 */
 	if (options_get_number(wp->window->options, "xterm-keys")) {
 		if ((out = xterm_keys_lookup(key)) != NULL) {
 			bufferevent_write(wp->event, out, strlen(out));
 			free(out);
 			return;
 		}
 	}

 	/* Otherwise look the key up in the table. */
 	for (i = 0; i < nitems(input_keys); i++) {
 		ike = &input_keys[i];

 		if ((ike->flags & INPUTKEY_KEYPAD) &&
 		    !(wp->screen->mode & MODE_KKEYPAD))
 			continue;
 		if ((ike->flags & INPUTKEY_CURSOR) &&
 		    !(wp->screen->mode & MODE_KCURSOR))
 			continue;

 		if ((key & KEYC_ESCAPE) && (ike->key | KEYC_ESCAPE) == key)
 			break;
 		if (ike->key == key)
 			break;
 	}
 	if (i == nitems(input_keys)) {
 		log_debug("key 0x%llx missing", key);
 		return;
 	}
 	dlen = strlen(ike->data);
 	log_debug("found key 0x%llx: \"%s\"", key, ike->data);

 	/* Prefix a \033 for escape. */
 	if (key & KEYC_ESCAPE)
 		bufferevent_write(wp->event, "\033", 1);
 	bufferevent_write(wp->event, ike->data, dlen);
 }

 /* Translate mouse and output. */
 static void
 input_key_mouse(struct window_pane *wp, struct mouse_event *m)
 {
 	char	buf[40];
 	size_t	len;
 	u_int	x, y;

 	if ((wp->screen->mode & ALL_MOUSE_MODES) == 0)
 		return;
 	if (!window_pane_visible(wp))
 		return;
 	if (cmd_mouse_at(wp, m, &x, &y, 0) != 0)
 		return;

 	/* If this pane is not in button mode, discard motion events. */
 	if (!(wp->screen->mode & MODE_MOUSE_BUTTON) && (m->b & MOUSE_MASK_DRAG))
 		return;

 	/*
 	 * Use the SGR (1006) extension only if the application requested it
 	 * and the underlying terminal also sent the event in this format (this
 	 * is because an old style mouse release event cannot be converted into
 	 * the new SGR format, since the released button is unknown). Otherwise
 	 * pretend that tmux doesn't speak this extension, and fall back to the
 	 * UTF-8 (1005) extension if the application requested, or to the
 	 * legacy format.
 	 */
 	if (m->sgr_type != ' ' && (wp->screen->mode & MODE_MOUSE_SGR)) {
 		len = xsnprintf(buf, sizeof buf, "\033[<%u;%u;%u%c",
 		    m->sgr_b, x + 1, y + 1, m->sgr_type);
 	} else if (wp->screen->mode & MODE_MOUSE_UTF8) {
 		if (m->b > 0x7ff - 32 || x > 0x7ff - 33 || y > 0x7ff - 33)
 			return;
 		len = xsnprintf(buf, sizeof buf, "\033[M");
 		len += input_split2(m->b + 32, &buf[len]);
 		len += input_split2(x + 33, &buf[len]);
 		len += input_split2(y + 33, &buf[len]);
 	} else {
 		if (m->b > 223)
 			return;
 		len = xsnprintf(buf, sizeof buf, "\033[M");
 		buf[len++] = m->b + 32;
 		buf[len++] = x + 33;
 		buf[len++] = y + 33;
 	}
 	log_debug("writing mouse %.*s to %%%u", (int)len, buf, wp->id);
 	bufferevent_write(wp->event, buf, len);
 }
	/* $OpenBSD$ */

	/*
	* Copyright (c) 2007 Nicholas Marriott <nicholas.marriott@gmail.com>
	*
	* 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 <stdlib.h>
	#include <string.h>

	#include "tmux.h"

	/*
	* This file is rather misleadingly named, it contains the code which takes a
	* key code and translates it into something suitable to be sent to the
	* application running in a pane (similar to input.c does in the other
	* direction with output).
	*/

	static void input_key_mouse(struct window_pane , struct mouse_event );

	struct input_key_ent {
	key_code key;
	const char *data;

	int flags;
	#define INPUTKEY_KEYPAD 0x1 /* keypad key */
	#define INPUTKEY_CURSOR 0x2 /* cursor key */
	};

	static const struct input_key_ent input_keys[] = {
	/* Backspace key. */
	{ KEYC_BSPACE, "\177", 0 },

	/* Function keys. */
	{ KEYC_F1, "\033OP", 0 },
	{ KEYC_F2, "\033OQ", 0 },
	{ KEYC_F3, "\033OR", 0 },
	{ KEYC_F4, "\033OS", 0 },
	{ KEYC_F5, "\033[15~", 0 },
	{ KEYC_F6, "\033[17~", 0 },
	{ KEYC_F7, "\033[18~", 0 },
	{ KEYC_F8, "\033[19~", 0 },
	{ KEYC_F9, "\033[20~", 0 },
	{ KEYC_F10, "\033[21~", 0 },
	{ KEYC_F11, "\033[23~", 0 },
	{ KEYC_F12, "\033[24~", 0 },
	{ KEYC_F1\|KEYC_SHIFT, "\033[25~", 0 },
	{ KEYC_F2\|KEYC_SHIFT, "\033[26~", 0 },
	{ KEYC_F3\|KEYC_SHIFT, "\033[28~", 0 },
	{ KEYC_F4\|KEYC_SHIFT, "\033[29~", 0 },
	{ KEYC_F5\|KEYC_SHIFT, "\033[31~", 0 },
	{ KEYC_F6\|KEYC_SHIFT, "\033[32~", 0 },
	{ KEYC_F7\|KEYC_SHIFT, "\033[33~", 0 },
	{ KEYC_F8\|KEYC_SHIFT, "\033[34~", 0 },
	{ KEYC_IC, "\033[2~", 0 },
	{ KEYC_DC, "\033[3~", 0 },
	{ KEYC_HOME, "\033[1~", 0 },
	{ KEYC_END, "\033[4~", 0 },
	{ KEYC_NPAGE, "\033[6~", 0 },
	{ KEYC_PPAGE, "\033[5~", 0 },
	{ KEYC_BTAB, "\033[Z", 0 },

	/*
	* Arrow keys. Cursor versions must come first. The codes are toggled
	* between CSI and SS3 versions when ctrl is pressed.
	*/
	{ KEYC_UP\|KEYC_CTRL, "\033[A", INPUTKEY_CURSOR },
	{ KEYC_DOWN\|KEYC_CTRL, "\033[B", INPUTKEY_CURSOR },
	{ KEYC_RIGHT\|KEYC_CTRL, "\033[C", INPUTKEY_CURSOR },
	{ KEYC_LEFT\|KEYC_CTRL, "\033[D", INPUTKEY_CURSOR },

	{ KEYC_UP, "\033OA", INPUTKEY_CURSOR },
	{ KEYC_DOWN, "\033OB", INPUTKEY_CURSOR },
	{ KEYC_RIGHT, "\033OC", INPUTKEY_CURSOR },
	{ KEYC_LEFT, "\033OD", INPUTKEY_CURSOR },

	{ KEYC_UP\|KEYC_CTRL, "\033OA", 0 },
	{ KEYC_DOWN\|KEYC_CTRL, "\033OB", 0 },
	{ KEYC_RIGHT\|KEYC_CTRL, "\033OC", 0 },
	{ KEYC_LEFT\|KEYC_CTRL, "\033OD", 0 },

	{ KEYC_UP, "\033[A", 0 },
	{ KEYC_DOWN, "\033[B", 0 },
	{ KEYC_RIGHT, "\033[C", 0 },
	{ KEYC_LEFT, "\033[D", 0 },

	/* Keypad keys. Keypad versions must come first. */
	{ KEYC_KP_SLASH, "\033Oo", INPUTKEY_KEYPAD },
	{ KEYC_KP_STAR, "\033Oj", INPUTKEY_KEYPAD },
	{ KEYC_KP_MINUS, "\033Om", INPUTKEY_KEYPAD },
	{ KEYC_KP_SEVEN, "\033Ow", INPUTKEY_KEYPAD },
	{ KEYC_KP_EIGHT, "\033Ox", INPUTKEY_KEYPAD },
	{ KEYC_KP_NINE, "\033Oy", INPUTKEY_KEYPAD },
	{ KEYC_KP_PLUS, "\033Ok", INPUTKEY_KEYPAD },
	{ KEYC_KP_FOUR, "\033Ot", INPUTKEY_KEYPAD },
	{ KEYC_KP_FIVE, "\033Ou", INPUTKEY_KEYPAD },
	{ KEYC_KP_SIX, "\033Ov", INPUTKEY_KEYPAD },
	{ KEYC_KP_ONE, "\033Oq", INPUTKEY_KEYPAD },
	{ KEYC_KP_TWO, "\033Or", INPUTKEY_KEYPAD },
	{ KEYC_KP_THREE, "\033Os", INPUTKEY_KEYPAD },
	{ KEYC_KP_ENTER, "\033OM", INPUTKEY_KEYPAD },
	{ KEYC_KP_ZERO, "\033Op", INPUTKEY_KEYPAD },
	{ KEYC_KP_PERIOD, "\033On", INPUTKEY_KEYPAD },

	{ KEYC_KP_SLASH, "/", 0 },
	{ KEYC_KP_STAR, "*", 0 },
	{ KEYC_KP_MINUS, "-", 0 },
	{ KEYC_KP_SEVEN, "7", 0 },
	{ KEYC_KP_EIGHT, "8", 0 },
	{ KEYC_KP_NINE, "9", 0 },
	{ KEYC_KP_PLUS, "+", 0 },
	{ KEYC_KP_FOUR, "4", 0 },
	{ KEYC_KP_FIVE, "5", 0 },
	{ KEYC_KP_SIX, "6", 0 },
	{ KEYC_KP_ONE, "1", 0 },
	{ KEYC_KP_TWO, "2", 0 },
	{ KEYC_KP_THREE, "3", 0 },
	{ KEYC_KP_ENTER, "\n", 0 },
	{ KEYC_KP_ZERO, "0", 0 },
	{ KEYC_KP_PERIOD, ".", 0 },
	};

	/* Split a character into two UTF-8 bytes. */
	static size_t
	input_split2(u_int c, u_char *dst)
	{
	if (c > 0x7f) {
	dst[0] = (c >> 6) \| 0xc0;
	dst[1] = (c & 0x3f) \| 0x80;
	return (2);
	}
	dst[0] = c;
	return (1);
	}

	/* Translate a key code into an output key sequence. */
	void
	input_key(struct window_pane wp, key_code key, struct mouse_event m)
	{
	const struct input_key_ent *ike;
	u_int i;
	size_t dlen;
	char *out;
	key_code justkey;
	struct utf8_data ud;

	log_debug("writing key 0x%llx (%s) to %%%u", key,
	key_string_lookup_key(key), wp->id);

	/* If this is a mouse key, pass off to mouse function. */
	if (KEYC_IS_MOUSE(key)) {
	if (m != NULL && m->wp != -1 && (u_int)m->wp == wp->id)
	input_key_mouse(wp, m);
	return;
	}

	/*
	* If this is a normal 7-bit key, just send it, with a leading escape
	* if necessary. If it is a UTF-8 key, split it and send it.
	*/
	justkey = (key & ~KEYC_ESCAPE);
	if (justkey <= 0x7f) {
	if (key & KEYC_ESCAPE)
	bufferevent_write(wp->event, "\033", 1);
	ud.data[0] = justkey;
	bufferevent_write(wp->event, &ud.data[0], 1);
	return;
	}
	if (justkey > 0x7f && justkey < KEYC_BASE) {
	if (utf8_split(justkey, &ud) != UTF8_DONE)
	return;
	if (key & KEYC_ESCAPE)
	bufferevent_write(wp->event, "\033", 1);
	bufferevent_write(wp->event, ud.data, ud.size);
	return;
	}

	/*
	* Then try to look this up as an xterm key, if the flag to output them
	* is set.
	*/
	if (options_get_number(wp->window->options, "xterm-keys")) {
	if ((out = xterm_keys_lookup(key)) != NULL) {
	bufferevent_write(wp->event, out, strlen(out));
	free(out);
	return;
	}
	}

	/* Otherwise look the key up in the table. */
	for (i = 0; i < nitems(input_keys); i++) {
	ike = &input_keys[i];

	if ((ike->flags & INPUTKEY_KEYPAD) &&
	!(wp->screen->mode & MODE_KKEYPAD))
	continue;
	if ((ike->flags & INPUTKEY_CURSOR) &&
	!(wp->screen->mode & MODE_KCURSOR))
	continue;

	if ((key & KEYC_ESCAPE) && (ike->key \| KEYC_ESCAPE) == key)
	break;
	if (ike->key == key)
	break;
	}
	if (i == nitems(input_keys)) {
	log_debug("key 0x%llx missing", key);
	return;
	}
	dlen = strlen(ike->data);
	log_debug("found key 0x%llx: \"%s\"", key, ike->data);

	/* Prefix a \033 for escape. */
	if (key & KEYC_ESCAPE)
	bufferevent_write(wp->event, "\033", 1);
	bufferevent_write(wp->event, ike->data, dlen);
	}

	/* Translate mouse and output. */
	static void
	input_key_mouse(struct window_pane wp, struct mouse_event m)
	{
	char buf[40];
	size_t len;
	u_int x, y;

	if ((wp->screen->mode & ALL_MOUSE_MODES) == 0)
	return;
	if (!window_pane_visible(wp))
	return;
	if (cmd_mouse_at(wp, m, &x, &y, 0) != 0)
	return;

	/* If this pane is not in button mode, discard motion events. */
	if (!(wp->screen->mode & MODE_MOUSE_BUTTON) && (m->b & MOUSE_MASK_DRAG))
	return;

	/*
	* Use the SGR (1006) extension only if the application requested it
	* and the underlying terminal also sent the event in this format (this
	* is because an old style mouse release event cannot be converted into
	* the new SGR format, since the released button is unknown). Otherwise
	* pretend that tmux doesn't speak this extension, and fall back to the
	* UTF-8 (1005) extension if the application requested, or to the
	* legacy format.
	*/
	if (m->sgr_type != ' ' && (wp->screen->mode & MODE_MOUSE_SGR)) {
	len = xsnprintf(buf, sizeof buf, "\033[<%u;%u;%u%c",
	m->sgr_b, x + 1, y + 1, m->sgr_type);
	} else if (wp->screen->mode & MODE_MOUSE_UTF8) {
	if (m->b > 0x7ff - 32 \|\| x > 0x7ff - 33 \|\| y > 0x7ff - 33)
	return;
	len = xsnprintf(buf, sizeof buf, "\033[M");
	len += input_split2(m->b + 32, &buf[len]);
	len += input_split2(x + 33, &buf[len]);
	len += input_split2(y + 33, &buf[len]);
	} else {
	if (m->b > 223)
	return;
	len = xsnprintf(buf, sizeof buf, "\033[M");
	buf[len++] = m->b + 32;
	buf[len++] = x + 33;
	buf[len++] = y + 33;
	}
	log_debug("writing mouse %.*s to %%%u", (int)len, buf, wp->id);
	bufferevent_write(wp->event, buf, len);
	}