text: /* $Id$ */
  
  /*
   * 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/time.h>
  
  #include <limits.h>
  #include <stdlib.h>
  #include <string.h>
  #include <termios.h>
  #include <unistd.h>
  
  #include "tmux.h"
  
  /*
   * Handle keys input from the outside terminal. tty_default_*_keys[] are a base
   * table of supported keys which are looked up in terminfo(5) and translated
   * into a ternary tree.
   */
  
  void		tty_keys_add1(struct tty_key **, const char *, int);
  void		tty_keys_add(struct tty *, const char *, int);
  void		tty_keys_free1(struct tty_key *);
  struct tty_key *tty_keys_find1(
  		    struct tty_key *, const char *, size_t, size_t *);
  struct tty_key *tty_keys_find(struct tty *, const char *, size_t, size_t *);
  void		tty_keys_callback(int, short, void *);
  int		tty_keys_mouse(struct tty *, const char *, size_t, size_t *);
  int		tty_keys_device(struct tty *, const char *, size_t, size_t *);
  
  /* Default raw keys. */
  struct tty_default_key_raw {
  	const char	       *string;
  	int	 	 	key;
  };
  const struct tty_default_key_raw tty_default_raw_keys[] = {
  	/*
  	 * Numeric keypad. Just use the vt100 escape sequences here and always
  	 * put the terminal into keypad_xmit mode. Translation of numbers
  	 * mode/applications mode is done in input-keys.c.
  	 */
  	{ "\033Oo", KEYC_KP_SLASH },
  	{ "\033Oj", KEYC_KP_STAR },
  	{ "\033Om", KEYC_KP_MINUS },
  	{ "\033Ow", KEYC_KP_SEVEN },
  	{ "\033Ox", KEYC_KP_EIGHT },
  	{ "\033Oy", KEYC_KP_NINE },
  	{ "\033Ok", KEYC_KP_PLUS },
  	{ "\033Ot", KEYC_KP_FOUR },
  	{ "\033Ou", KEYC_KP_FIVE },
  	{ "\033Ov", KEYC_KP_SIX },
  	{ "\033Oq", KEYC_KP_ONE },
  	{ "\033Or", KEYC_KP_TWO },
  	{ "\033Os", KEYC_KP_THREE },
  	{ "\033OM", KEYC_KP_ENTER },
  	{ "\033Op", KEYC_KP_ZERO },
  	{ "\033On", KEYC_KP_PERIOD },
  
  	/* Arrow keys. */
  	{ "\033OA", KEYC_UP },
  	{ "\033OB", KEYC_DOWN },
  	{ "\033OC", KEYC_RIGHT },
  	{ "\033OD", KEYC_LEFT },
  
  	{ "\033[A", KEYC_UP },
  	{ "\033[B", KEYC_DOWN },
  	{ "\033[C", KEYC_RIGHT },
  	{ "\033[D", KEYC_LEFT },
  
  	/* Other (xterm) "cursor" keys. */
  	{ "\033OH", KEYC_HOME },
  	{ "\033OF", KEYC_END },
  
  	{ "\033[H", KEYC_HOME },
  	{ "\033[F", KEYC_END },
  
  	/* rxvt-style arrow + modifier keys. */
  	{ "\033Oa", KEYC_UP|KEYC_CTRL },
  	{ "\033Ob", KEYC_DOWN|KEYC_CTRL },
  	{ "\033Oc", KEYC_RIGHT|KEYC_CTRL },
  	{ "\033Od", KEYC_LEFT|KEYC_CTRL },
  
  	{ "\033[a", KEYC_UP|KEYC_SHIFT },
  	{ "\033[b", KEYC_DOWN|KEYC_SHIFT },
  	{ "\033[c", KEYC_RIGHT|KEYC_SHIFT },
  	{ "\033[d", KEYC_LEFT|KEYC_SHIFT },
  
  	/* rxvt-style function + modifier keys (C = ^, S = $, C-S = @). */
  	{ "\033[11^", KEYC_F1|KEYC_CTRL },
  	{ "\033[12^", KEYC_F2|KEYC_CTRL },
  	{ "\033[13^", KEYC_F3|KEYC_CTRL },
  	{ "\033[14^", KEYC_F4|KEYC_CTRL },
  	{ "\033[15^", KEYC_F5|KEYC_CTRL },
  	{ "\033[17^", KEYC_F6|KEYC_CTRL },
  	{ "\033[18^", KEYC_F7|KEYC_CTRL },
  	{ "\033[19^", KEYC_F8|KEYC_CTRL },
  	{ "\033[20^", KEYC_F9|KEYC_CTRL },
  	{ "\033[21^", KEYC_F10|KEYC_CTRL },
  	{ "\033[23^", KEYC_F11|KEYC_CTRL },
  	{ "\033[24^", KEYC_F12|KEYC_CTRL },
  	{ "\033[25^", KEYC_F13|KEYC_CTRL },
  	{ "\033[26^", KEYC_F14|KEYC_CTRL },
  	{ "\033[28^", KEYC_F15|KEYC_CTRL },
  	{ "\033[29^", KEYC_F16|KEYC_CTRL },
  	{ "\033[31^", KEYC_F17|KEYC_CTRL },
  	{ "\033[32^", KEYC_F18|KEYC_CTRL },
  	{ "\033[33^", KEYC_F19|KEYC_CTRL },
  	{ "\033[34^", KEYC_F20|KEYC_CTRL },
  	{ "\033[2^", KEYC_IC|KEYC_CTRL },
  	{ "\033[3^", KEYC_DC|KEYC_CTRL },
  	{ "\033[7^", KEYC_HOME|KEYC_CTRL },
  	{ "\033[8^", KEYC_END|KEYC_CTRL },
  	{ "\033[6^", KEYC_NPAGE|KEYC_CTRL },
  	{ "\033[5^", KEYC_PPAGE|KEYC_CTRL },
  
  	{ "\033[11$", KEYC_F1|KEYC_SHIFT },
  	{ "\033[12$", KEYC_F2|KEYC_SHIFT },
  	{ "\033[13$", KEYC_F3|KEYC_SHIFT },
  	{ "\033[14$", KEYC_F4|KEYC_SHIFT },
  	{ "\033[15$", KEYC_F5|KEYC_SHIFT },
  	{ "\033[17$", KEYC_F6|KEYC_SHIFT },
  	{ "\033[18$", KEYC_F7|KEYC_SHIFT },
  	{ "\033[19$", KEYC_F8|KEYC_SHIFT },
  	{ "\033[20$", KEYC_F9|KEYC_SHIFT },
  	{ "\033[21$", KEYC_F10|KEYC_SHIFT },
  	{ "\033[23$", KEYC_F11|KEYC_SHIFT },
  	{ "\033[24$", KEYC_F12|KEYC_SHIFT },
  	{ "\033[25$", KEYC_F13|KEYC_SHIFT },
  	{ "\033[26$", KEYC_F14|KEYC_SHIFT },
  	{ "\033[28$", KEYC_F15|KEYC_SHIFT },
  	{ "\033[29$", KEYC_F16|KEYC_SHIFT },
  	{ "\033[31$", KEYC_F17|KEYC_SHIFT },
  	{ "\033[32$", KEYC_F18|KEYC_SHIFT },
  	{ "\033[33$", KEYC_F19|KEYC_SHIFT },
  	{ "\033[34$", KEYC_F20|KEYC_SHIFT },
  	{ "\033[2$", KEYC_IC|KEYC_SHIFT },
  	{ "\033[3$", KEYC_DC|KEYC_SHIFT },
  	{ "\033[7$", KEYC_HOME|KEYC_SHIFT },
  	{ "\033[8$", KEYC_END|KEYC_SHIFT },
  	{ "\033[6$", KEYC_NPAGE|KEYC_SHIFT },
  	{ "\033[5$", KEYC_PPAGE|KEYC_SHIFT },
  
  	{ "\033[11@", KEYC_F1|KEYC_CTRL|KEYC_SHIFT },
  	{ "\033[12@", KEYC_F2|KEYC_CTRL|KEYC_SHIFT },
  	{ "\033[13@", KEYC_F3|KEYC_CTRL|KEYC_SHIFT },
  	{ "\033[14@", KEYC_F4|KEYC_CTRL|KEYC_SHIFT },
  	{ "\033[15@", KEYC_F5|KEYC_CTRL|KEYC_SHIFT },
  	{ "\033[17@", KEYC_F6|KEYC_CTRL|KEYC_SHIFT },
  	{ "\033[18@", KEYC_F7|KEYC_CTRL|KEYC_SHIFT },
  	{ "\033[19@", KEYC_F8|KEYC_CTRL|KEYC_SHIFT },
  	{ "\033[20@", KEYC_F9|KEYC_CTRL|KEYC_SHIFT },
  	{ "\033[21@", KEYC_F10|KEYC_CTRL|KEYC_SHIFT },
  	{ "\033[23@", KEYC_F11|KEYC_CTRL|KEYC_SHIFT },
  	{ "\033[24@", KEYC_F12|KEYC_CTRL|KEYC_SHIFT },
  	{ "\033[25@", KEYC_F13|KEYC_CTRL|KEYC_SHIFT },
  	{ "\033[26@", KEYC_F14|KEYC_CTRL|KEYC_SHIFT },
  	{ "\033[28@", KEYC_F15|KEYC_CTRL|KEYC_SHIFT },
  	{ "\033[29@", KEYC_F16|KEYC_CTRL|KEYC_SHIFT },
  	{ "\033[31@", KEYC_F17|KEYC_CTRL|KEYC_SHIFT },
  	{ "\033[32@", KEYC_F18|KEYC_CTRL|KEYC_SHIFT },
  	{ "\033[33@", KEYC_F19|KEYC_CTRL|KEYC_SHIFT },
  	{ "\033[34@", KEYC_F20|KEYC_CTRL|KEYC_SHIFT },
  	{ "\033[2@", KEYC_IC|KEYC_CTRL|KEYC_SHIFT },
  	{ "\033[3@", KEYC_DC|KEYC_CTRL|KEYC_SHIFT },
  	{ "\033[7@", KEYC_HOME|KEYC_CTRL|KEYC_SHIFT },
  	{ "\033[8@", KEYC_END|KEYC_CTRL|KEYC_SHIFT },
  	{ "\033[6@", KEYC_NPAGE|KEYC_CTRL|KEYC_SHIFT },
  	{ "\033[5@", KEYC_PPAGE|KEYC_CTRL|KEYC_SHIFT },
  
  	/* Focus tracking. */
  	{ "\033[I", KEYC_FOCUS_IN },
  	{ "\033[O", KEYC_FOCUS_OUT },
  };
  
  /* Default terminfo(5) keys. */
  struct tty_default_key_code {
  	enum tty_code_code	code;
  	int	 	 	key;
  };
  const struct tty_default_key_code tty_default_code_keys[] = {
  	/* Function keys. */
  	{ TTYC_KF1, KEYC_F1 },
  	{ TTYC_KF2, KEYC_F2 },
  	{ TTYC_KF3, KEYC_F3 },
  	{ TTYC_KF4, KEYC_F4 },
  	{ TTYC_KF5, KEYC_F5 },
  	{ TTYC_KF6, KEYC_F6 },
  	{ TTYC_KF7, KEYC_F7 },
  	{ TTYC_KF8, KEYC_F8 },
  	{ TTYC_KF9, KEYC_F9 },
  	{ TTYC_KF10, KEYC_F10 },
  	{ TTYC_KF11, KEYC_F11 },
  	{ TTYC_KF12, KEYC_F12 },
  	{ TTYC_KF13, KEYC_F13 },
  	{ TTYC_KF14, KEYC_F14 },
  	{ TTYC_KF15, KEYC_F15 },
  	{ TTYC_KF16, KEYC_F16 },
  	{ TTYC_KF17, KEYC_F17 },
  	{ TTYC_KF18, KEYC_F18 },
  	{ TTYC_KF19, KEYC_F19 },
  	{ TTYC_KF20, KEYC_F20 },
  	{ TTYC_KICH1, KEYC_IC },
  	{ TTYC_KDCH1, KEYC_DC },
  	{ TTYC_KHOME, KEYC_HOME },
  	{ TTYC_KEND, KEYC_END },
  	{ TTYC_KNP, KEYC_NPAGE },
  	{ TTYC_KPP, KEYC_PPAGE },
  	{ TTYC_KCBT, KEYC_BTAB },
  
  	/* Arrow keys from terminfo. */
  	{ TTYC_KCUU1, KEYC_UP },
  	{ TTYC_KCUD1, KEYC_DOWN },
  	{ TTYC_KCUB1, KEYC_LEFT },
  	{ TTYC_KCUF1, KEYC_RIGHT },
  
  	/* Key and modifier capabilities. */
  	{ TTYC_KDC2, KEYC_DC|KEYC_SHIFT },
  	{ TTYC_KDC3, KEYC_DC|KEYC_ESCAPE },
  	{ TTYC_KDC4, KEYC_DC|KEYC_SHIFT|KEYC_ESCAPE },
  	{ TTYC_KDC5, KEYC_DC|KEYC_CTRL },
  	{ TTYC_KDC6, KEYC_DC|KEYC_SHIFT|KEYC_CTRL },
  	{ TTYC_KDC7, KEYC_DC|KEYC_ESCAPE|KEYC_CTRL },
  	{ TTYC_KDN2, KEYC_DOWN|KEYC_SHIFT },
  	{ TTYC_KDN3, KEYC_DOWN|KEYC_ESCAPE },
  	{ TTYC_KDN4, KEYC_DOWN|KEYC_SHIFT|KEYC_ESCAPE },
  	{ TTYC_KDN5, KEYC_DOWN|KEYC_CTRL },
  	{ TTYC_KDN6, KEYC_DOWN|KEYC_SHIFT|KEYC_CTRL },
  	{ TTYC_KDN7, KEYC_DOWN|KEYC_ESCAPE|KEYC_CTRL },
  	{ TTYC_KEND2, KEYC_END|KEYC_SHIFT },
  	{ TTYC_KEND3, KEYC_END|KEYC_ESCAPE },
  	{ TTYC_KEND4, KEYC_END|KEYC_SHIFT|KEYC_ESCAPE },
  	{ TTYC_KEND5, KEYC_END|KEYC_CTRL },
  	{ TTYC_KEND6, KEYC_END|KEYC_SHIFT|KEYC_CTRL },
  	{ TTYC_KEND7, KEYC_END|KEYC_ESCAPE|KEYC_CTRL },
  	{ TTYC_KHOM2, KEYC_HOME|KEYC_SHIFT },
  	{ TTYC_KHOM3, KEYC_HOME|KEYC_ESCAPE },
  	{ TTYC_KHOM4, KEYC_HOME|KEYC_SHIFT|KEYC_ESCAPE },
  	{ TTYC_KHOM5, KEYC_HOME|KEYC_CTRL },
  	{ TTYC_KHOM6, KEYC_HOME|KEYC_SHIFT|KEYC_CTRL },
  	{ TTYC_KHOM7, KEYC_HOME|KEYC_ESCAPE|KEYC_CTRL },
  	{ TTYC_KIC2, KEYC_IC|KEYC_SHIFT },
  	{ TTYC_KIC3, KEYC_IC|KEYC_ESCAPE },
  	{ TTYC_KIC4, KEYC_IC|KEYC_SHIFT|KEYC_ESCAPE },
  	{ TTYC_KIC5, KEYC_IC|KEYC_CTRL },
  	{ TTYC_KIC6, KEYC_IC|KEYC_SHIFT|KEYC_CTRL },
  	{ TTYC_KIC7, KEYC_IC|KEYC_ESCAPE|KEYC_CTRL },
  	{ TTYC_KLFT2, KEYC_LEFT|KEYC_SHIFT },
  	{ TTYC_KLFT3, KEYC_LEFT|KEYC_ESCAPE },
  	{ TTYC_KLFT4, KEYC_LEFT|KEYC_SHIFT|KEYC_ESCAPE },
  	{ TTYC_KLFT5, KEYC_LEFT|KEYC_CTRL },
  	{ TTYC_KLFT6, KEYC_LEFT|KEYC_SHIFT|KEYC_CTRL },
  	{ TTYC_KLFT7, KEYC_LEFT|KEYC_ESCAPE|KEYC_CTRL },
  	{ TTYC_KNXT2, KEYC_NPAGE|KEYC_SHIFT },
  	{ TTYC_KNXT3, KEYC_NPAGE|KEYC_ESCAPE },
  	{ TTYC_KNXT4, KEYC_NPAGE|KEYC_SHIFT|KEYC_ESCAPE },
  	{ TTYC_KNXT5, KEYC_NPAGE|KEYC_CTRL },
  	{ TTYC_KNXT6, KEYC_NPAGE|KEYC_SHIFT|KEYC_CTRL },
  	{ TTYC_KNXT7, KEYC_NPAGE|KEYC_ESCAPE|KEYC_CTRL },
  	{ TTYC_KPRV2, KEYC_PPAGE|KEYC_SHIFT },
  	{ TTYC_KPRV3, KEYC_PPAGE|KEYC_ESCAPE },
  	{ TTYC_KPRV4, KEYC_PPAGE|KEYC_SHIFT|KEYC_ESCAPE },
  	{ TTYC_KPRV5, KEYC_PPAGE|KEYC_CTRL },
  	{ TTYC_KPRV6, KEYC_PPAGE|KEYC_SHIFT|KEYC_CTRL },
  	{ TTYC_KPRV7, KEYC_PPAGE|KEYC_ESCAPE|KEYC_CTRL },
  	{ TTYC_KRIT2, KEYC_RIGHT|KEYC_SHIFT },
  	{ TTYC_KRIT3, KEYC_RIGHT|KEYC_ESCAPE },
  	{ TTYC_KRIT4, KEYC_RIGHT|KEYC_SHIFT|KEYC_ESCAPE },
  	{ TTYC_KRIT5, KEYC_RIGHT|KEYC_CTRL },
  	{ TTYC_KRIT6, KEYC_RIGHT|KEYC_SHIFT|KEYC_CTRL },
  	{ TTYC_KRIT7, KEYC_RIGHT|KEYC_ESCAPE|KEYC_CTRL },
  	{ TTYC_KUP2, KEYC_UP|KEYC_SHIFT },
  	{ TTYC_KUP3, KEYC_UP|KEYC_ESCAPE },
  	{ TTYC_KUP4, KEYC_UP|KEYC_SHIFT|KEYC_ESCAPE },
  	{ TTYC_KUP5, KEYC_UP|KEYC_CTRL },
  	{ TTYC_KUP6, KEYC_UP|KEYC_SHIFT|KEYC_CTRL },
  	{ TTYC_KUP7, KEYC_UP|KEYC_ESCAPE|KEYC_CTRL },
  };
  
  /* Add key to tree. */
  void
  tty_keys_add(struct tty *tty, const char *s, int key)
  {
  	struct tty_key	*tk;
  	size_t		 size;
  	const char     	*keystr;
  
  	keystr = key_string_lookup_key(key);
  	if ((tk = tty_keys_find(tty, s, strlen(s), &size)) == NULL) {
  		log_debug("new key %s: 0x%x (%s)", s, key, keystr);
  		tty_keys_add1(&tty->key_tree, s, key);
  	} else {
  		log_debug("replacing key %s: 0x%x (%s)", s, key, keystr);
  		tk->key = key;
  	}
  }
  
  /* Add next node to the tree. */
  void
  tty_keys_add1(struct tty_key **tkp, const char *s, int key)
  {
  	struct tty_key	*tk;
  
  	/* Allocate a tree entry if there isn't one already. */
  	tk = *tkp;
  	if (tk == NULL) {
  		tk = *tkp = xcalloc(1, sizeof *tk);
  		tk->ch = *s;
  		tk->key = KEYC_NONE;
  	}
  
  	/* Find the next entry. */
  	if (*s == tk->ch) {
  		/* Move forward in string. */
  		s++;
  
  		/* If this is the end of the string, no more is necessary. */
  		if (*s == '\0') {
  			tk->key = key;
  			return;
  		}
  
  		/* Use the child tree for the next character. */
  		tkp = &tk->next;
  	} else {
  		if (*s < tk->ch)
  			tkp = &tk->left;
  		else if (*s > tk->ch)
  			tkp = &tk->right;
  	}
  
  	/* And recurse to add it. */
  	tty_keys_add1(tkp, s, key);
  }
  
  /* Initialise a key tree from the table. */
  void
  tty_keys_build(struct tty *tty)
  {
  	const struct tty_default_key_raw	*tdkr;
  	const struct tty_default_key_code	*tdkc;
  	u_int		 			 i;
  	const char				*s;
  
  	if (tty->key_tree != NULL)
  		tty_keys_free (tty);
  	tty->key_tree = NULL;
  
  	for (i = 0; i < nitems(tty_default_raw_keys); i++) {
  		tdkr = &tty_default_raw_keys[i];
  
  		s = tdkr->string;
  		if (*s != '\0')
  			tty_keys_add(tty, s, tdkr->key);
  	}
  	for (i = 0; i < nitems(tty_default_code_keys); i++) {
  		tdkc = &tty_default_code_keys[i];
  
  		s = tty_term_string(tty->term, tdkc->code);
  		if (*s != '\0')
  			tty_keys_add(tty, s, tdkc->key);
  
  	}
  }
  
  /* Free the entire key tree. */
  void
  tty_keys_free(struct tty *tty)
  {
  	tty_keys_free1(tty->key_tree);
  }
  
  /* Free a single key. */
  void
  tty_keys_free1(struct tty_key *tk)
  {
  	if (tk->next != NULL)
  		tty_keys_free1(tk->next);
  	if (tk->left != NULL)
  		tty_keys_free1(tk->left);
  	if (tk->right != NULL)
  		tty_keys_free1(tk->right);
  	free(tk);
  }
  
  /* Lookup a key in the tree. */
  struct tty_key *
  tty_keys_find(struct tty *tty, const char *buf, size_t len, size_t *size)
  {
  	*size = 0;
  	return (tty_keys_find1(tty->key_tree, buf, len, size));
  }
  
  /* Find the next node. */
  struct tty_key *
  tty_keys_find1(struct tty_key *tk, const char *buf, size_t len, size_t *size)
  {
  	/* If the node is NULL, this is the end of the tree. No match. */
  	if (tk == NULL)
  		return (NULL);
  
  	/* Pick the next in the sequence. */
  	if (tk->ch == *buf) {
  		/* Move forward in the string. */
  		buf++; len--;
  		(*size)++;
  
  		/* At the end of the string, return the current node. */
  		if (len == 0 || (tk->next == NULL && tk->key != KEYC_NONE))
  			return (tk);
  
  		/* Move into the next tree for the following character. */
  		tk = tk->next;
  	} else {
  		if (*buf < tk->ch)
  			tk = tk->left;
  		else if (*buf > tk->ch)
  			tk = tk->right;
  	}
  
  	/* Move to the next in the tree. */
  	return (tty_keys_find1(tk, buf, len, size));
  }
  
  /*
   * Process at least one key in the buffer and invoke tty->key_callback. Return
   * 0 if there are no further keys, or 1 if there could be more in the buffer.
   */
  int
  tty_keys_next(struct tty *tty)
  {
  	struct tty_key	*tk;
  	struct timeval	 tv;
  	const char	*buf;
  	size_t		 len, size;
  	cc_t		 bspace;
  	int		 key, delay, expired = 0;
  
  	/* Get key buffer. */
  	buf = EVBUFFER_DATA(tty->event->input);
  	len = EVBUFFER_LENGTH(tty->event->input);
  	if (len == 0)
  		return (0);
  	log_debug("keys are %zu (%.*s)", len, (int) len, buf);
  
  	/* Is this device attributes response? */
  	switch (tty_keys_device(tty, buf, len, &size)) {
  	case 0:		/* yes */
  		key = KEYC_NONE;
  		goto complete_key;
  	case -1:	/* no, or not valid */
  		break;
  	case 1:		/* partial */
  		goto partial_key;
  	}
  
  	/* Is this a mouse key press? */
  	switch (tty_keys_mouse(tty, buf, len, &size)) {
  	case 0:		/* yes */
  		key = KEYC_MOUSE;
  		goto complete_key;
  	case -1:	/* no, or not valid */
  		break;
  	case 1:		/* partial */
  		goto partial_key;
  	}
  
  	/* Try to parse a key with an xterm-style modifier. */
  	switch (xterm_keys_find(buf, len, &size, &key)) {
  	case 0:		/* found */
  		goto complete_key;
  	case -1:	/* not found */
  		break;
  	case 1:
  		goto partial_key;
  	}
  
  	/* Look for matching key string and return if found. */
  	tk = tty_keys_find(tty, buf, len, &size);
  	if (tk != NULL) {
  		if (tk->next != NULL)
  			goto partial_key;
  		key = tk->key;
  		goto complete_key;
  	}
  
  first_key:
  	/* Is this a meta key? */
  	if (len >= 2 && buf[0] == '\033') {
  		if (buf[1] != '\033') {
  			key = buf[1] | KEYC_ESCAPE;
  			size = 2;
  			goto complete_key;
  		}
  
  		tk = tty_keys_find(tty, buf + 1, len - 1, &size);
  		if (tk != NULL && (!expired || tk->next == NULL)) {
  			size++;	/* include escape */
  			if (tk->next != NULL)
  				goto partial_key;
  			key = tk->key;
  			if (key != KEYC_NONE)
  				key |= KEYC_ESCAPE;
  			goto complete_key;
  		}
  	}
  
  	/* No key found, take first. */
  	key = (u_char) *buf;
  	size = 1;
  
  	/*
  	 * Check for backspace key using termios VERASE - the terminfo
  	 * kbs entry is extremely unreliable, so cannot be safely
  	 * used. termios should have a better idea.
  	 */
  	bspace = tty->tio.c_cc[VERASE];
  	if (bspace != _POSIX_VDISABLE && key == bspace)
  		key = KEYC_BSPACE;
  
  	goto complete_key;
  
  partial_key:
  	log_debug("partial key %.*s", (int) len, buf);
  
  	/* If timer is going, check for expiration. */
  	if (tty->flags & TTY_TIMER) {
  		if (evtimer_initialized(&tty->key_timer) &&
  		    !evtimer_pending(&tty->key_timer, NULL)) {
  			expired = 1;
  			goto first_key;
  		}
  		return (0);
  	}
  
  	/* Get the time period. */
  	delay = options_get_number(&global_options, "escape-time");
  	tv.tv_sec = delay / 1000;
  	tv.tv_usec = (delay % 1000) * 1000L;
  
  	/* Start the timer. */
  	if (event_initialized(&tty->key_timer))
  		evtimer_del(&tty->key_timer);
  	evtimer_set(&tty->key_timer, tty_keys_callback, tty);
  	evtimer_add(&tty->key_timer, &tv);
  
  	tty->flags |= TTY_TIMER;
  	return (0);
  
  complete_key:
  	log_debug("complete key %.*s %#x", (int) size, buf, key);
  
  	/* Remove data from buffer. */
  	evbuffer_drain(tty->event->input, size);
  
  	/* Remove key timer. */
  	if (event_initialized(&tty->key_timer))
  		evtimer_del(&tty->key_timer);
  	tty->flags &= ~TTY_TIMER;
  
  	/* Check for focus events. */
  	if (key == KEYC_FOCUS_OUT) {
  		tty->client->flags &= ~CLIENT_FOCUSED;
  		return (1);
  	} else if (key == KEYC_FOCUS_IN) {
  		tty->client->flags |= CLIENT_FOCUSED;
  		return (1);
  	}
  
  	/* Fire the key. */
  	if (key != KEYC_NONE)
  		server_client_handle_key(tty->client, key);
  
  	return (1);
  }
  
  /* Key timer callback. */
  void
  tty_keys_callback(unused int fd, unused short events, void *data)
  {
  	struct tty	*tty = data;
  
  	if (tty->flags & TTY_TIMER) {
  		while (tty_keys_next(tty))
  			;
  	}
  }
  
  /*
   * Handle mouse key input. Returns 0 for success, -1 for failure, 1 for partial
   * (probably a mouse sequence but need more data).
   */
  int
  tty_keys_mouse(struct tty *tty, const char *buf, size_t len, size_t *size)
  {
  	struct mouse_event	*m = &tty->mouse;
  	struct utf8_data	 utf8data;
  	u_int			 i, value, x, y, b, sgr, sgr_b, sgr_rel;
  	unsigned char		 c;
  
  	/*
  	 * Standard mouse sequences are \033[M followed by three characters
  	 * indicating button, X and Y, all based at 32 with 1,1 top-left.
  	 *
  	 * UTF-8 mouse sequences are similar but the three are expressed as
  	 * UTF-8 characters.
  	 *
  	 * SGR extended mouse sequences are \033[< followed by three numbers in
  	 * decimal and separated by semicolons indicating button, X and Y. A
  	 * trailing 'M' is click or scroll and trailing 'm' release. All are
  	 * based at 0 with 1,1 top-left.
  	 */
  
  	*size = 0;
  	x = y = b = sgr = sgr_b = sgr_rel = 0;
  
  	/* First two bytes are always \033[. */
  	if (buf[0] != '\033')
  		return (-1);
  	if (len == 1)
  		return (1);
  	if (buf[1] != '[')
  		return (-1);
  	if (len == 2)
  		return (1);
  
  	/*
  	 * Third byte is M in old standard and UTF-8 extension, < in SGR
  	 * extension.
  	 */
  	if (buf[2] == 'M') {
  		/* Read the three inputs. */
  		*size = 3;
  		for (i = 0; i < 3; i++) {
  			if (len <= *size)
  				return (1);
  
  			if (tty->mode & MODE_MOUSE_UTF8) {
  				if (utf8_open(&utf8data, buf[*size])) {
  					if (utf8data.size != 2)
  						return (-1);
  					(*size)++;
  					if (len <= *size)
  						return (1);
  					utf8_append(&utf8data, buf[*size]);
  					value = utf8_combine(&utf8data);
  				} else
  					value = (u_char) buf[*size];
  				(*size)++;
  			} else {
  				value = (u_char) buf[*size];
  				(*size)++;
  			}
  
  			if (i == 0)
  				b = value;
  			else if (i == 1)
  				x = value;
  			else
  				y = value;
  		}
  		log_debug("mouse input: %.*s", (int) *size, buf);
  
  		/* Check and return the mouse input. */
  		if (b < 32)
  			return (-1);
  		b -= 32;
  		if (x >= 33)
  			x -= 33;
  		else
  			x = 256 - x;
  		if (y >= 33)
  			y -= 33;
  		else
  			y = 256 - y;
  	} else if (buf[2] == '<') {
  		/* Read the three inputs. */
  		*size = 3;
  		while (1) {
  			if (len <= *size)
  				return (1);
  			c = (u_char)buf[(*size)++];
  			if (c == ';')
  				break;
  			if (c < '0' || c > '9')
  				return (-1);
  			sgr_b = 10 * sgr_b + (c - '0');
  		}
  		while (1) {
  			if (len <= *size)
  				return (1);
  			c = (u_char)buf[(*size)++];
  			if (c == ';')
  				break;
  			if (c < '0' || c > '9')
  				return (-1);
  			x = 10 * x + (c - '0');
  		}
  		while (1) {
  			if (len <= *size)
  				return (1);
  			c = (u_char) buf[(*size)++];
  			if (c == 'M' || c == 'm')
  				break;
  			if (c < '0' || c > '9')
  				return (-1);
  			y = 10 * y + (c - '0');
  		}
  		log_debug("mouse input (sgr): %.*s", (int) *size, buf);
  
  		/* Check and return the mouse input. */
  		if (x < 1 || y < 1)
  			return (-1);
  		x--;
  		y--;
  		sgr = 1;
  		sgr_rel = (c == 'm');
  
  		/* Figure out what b would be in old format. */
  		b = sgr_b;
  		if (sgr_rel)
  			b |= 3;
  	} else
  		return (-1);
  
  	/* Fill in mouse structure. */
  	if (~m->event & MOUSE_EVENT_WHEEL) {
  		m->lx = m->x;
  		m->ly = m->y;
  	}
  	m->xb = b;
  	m->sgr = sgr;
  	m->sgr_xb = sgr_b;
  	m->sgr_rel = sgr_rel;
  	if (b & 64) { /* wheel button */
  		b &= 3;
  		if (b == 0)
  			m->wheel = MOUSE_WHEEL_UP;
  		else if (b == 1)
  			m->wheel = MOUSE_WHEEL_DOWN;
  		m->event = MOUSE_EVENT_WHEEL;
  	} else if ((b & 3) == 3) {
  		if (~m->event & MOUSE_EVENT_DRAG && x == m->x && y == m->y) {
  			m->event = MOUSE_EVENT_CLICK;
  		} else
  			m->event = MOUSE_EVENT_DRAG;
  		m->event |= MOUSE_EVENT_UP;
  	} else {
  		if (b & 32) /* drag motion */
  			m->event = MOUSE_EVENT_DRAG;
  		else {
  			if (m->event & MOUSE_EVENT_UP && x == m->x && y == m->y)
  				m->clicks = (m->clicks + 1) % 3;
  			else
  				m->clicks = 0;
  			m->sx = x;
  			m->sy = y;
  			m->event = MOUSE_EVENT_DOWN;
  		}
  		m->button = (b & 3);
  	}
  	m->x = x;
  	m->y = y;
  
  	return (0);
  }
  
  /*
   * Handle device attributes input. Returns 0 for success, -1 for failure, 1 for
   * partial.
   */
  int
  tty_keys_device(struct tty *tty, const char *buf, size_t len, size_t *size)
  {
  	u_int i, class;
  	char  tmp[64], *endptr;
  
  	/*
  	 * Primary device attributes are \033[?a;b and secondary are
  	 * \033[>a;b;c.
  	 */
  
  	*size = 0;
  
  	/* First three bytes are always \033[?. */
  	if (buf[0] != '\033')
  		return (-1);
  	if (len == 1)
  		return (1);
  	if (buf[1] != '[')
  		return (-1);
  	if (len == 2)
  		return (1);
  	if (buf[2] != '>' && buf[2] != '?')
  		return (-1);
  	if (len == 3)
  		return (1);
  
  	/* Copy the rest up to a 'c'. */
  	for (i = 0; i < (sizeof tmp) - 1 && buf[3 + i] != 'c'; i++) {
  		if (3 + i == len)
  			return (1);
  		tmp[i] = buf[3 + i];
  	}
  	if (i == (sizeof tmp) - 1)
  		return (-1);
  	tmp[i] = '\0';
  	*size = 4 + i;
  
  	/* Only primary is of interest. */
  	if (buf[2] != '?')
  		return (0);
  
  	/* Convert service class. */
  	class = strtoul(tmp, &endptr, 10);
  	if (*endptr != ';')
  		class = 0;
  
  	log_debug("received service class %u", class);
  	tty_set_class(tty, class);
  
  	return (0);
  }
  