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/* $Id: tty-keys.c 2553 2011-07-09 09:42:33Z tcunha $ */

/*
* 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 <string.h>
#include <termios.h>
#include <unistd.h>

#include "tmux.h"

/*
* Handle keys input from the outside terminal. tty_keys[] is a base table of
* supported keys which are looked up in terminfo(5) and translated into a
* ternary tree (a binary tree of binary trees).
*/

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 *, struct mouse_event *);

struct tty_key_ent {
enum tty_code_code code;
const char *string;

int key;
int flags;
#define TTYKEY_RAW 0x1
};

/*
* Default key tables. Those flagged with TTYKEY_RAW are inserted directly,
* otherwise they are looked up in terminfo(5).
*/
const struct tty_key_ent tty_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.
*/
{ 0, "\033Oo", KEYC_KP_SLASH, TTYKEY_RAW },
{ 0, "\033Oj", KEYC_KP_STAR, TTYKEY_RAW },
{ 0, "\033Om", KEYC_KP_MINUS, TTYKEY_RAW },
{ 0, "\033Ow", KEYC_KP_SEVEN, TTYKEY_RAW },
{ 0, "\033Ox", KEYC_KP_EIGHT, TTYKEY_RAW },
{ 0, "\033Oy", KEYC_KP_NINE, TTYKEY_RAW },
{ 0, "\033Ok", KEYC_KP_PLUS, TTYKEY_RAW },
{ 0, "\033Ot", KEYC_KP_FOUR, TTYKEY_RAW },
{ 0, "\033Ou", KEYC_KP_FIVE, TTYKEY_RAW },
{ 0, "\033Ov", KEYC_KP_SIX, TTYKEY_RAW },
{ 0, "\033Oq", KEYC_KP_ONE, TTYKEY_RAW },
{ 0, "\033Or", KEYC_KP_TWO, TTYKEY_RAW },
{ 0, "\033Os", KEYC_KP_THREE, TTYKEY_RAW },
{ 0, "\033OM", KEYC_KP_ENTER, TTYKEY_RAW },
{ 0, "\033Op", KEYC_KP_ZERO, TTYKEY_RAW },
{ 0, "\033On", KEYC_KP_PERIOD, TTYKEY_RAW },

/* Arrow keys. */
{ 0, "\033OA", KEYC_UP, TTYKEY_RAW },
{ 0, "\033OB", KEYC_DOWN, TTYKEY_RAW },
{ 0, "\033OC", KEYC_RIGHT, TTYKEY_RAW },
{ 0, "\033OD", KEYC_LEFT, TTYKEY_RAW },

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

/* rxvt-style arrow + modifier keys. */
{ 0, "\033Oa", KEYC_UP|KEYC_CTRL, TTYKEY_RAW },
{ 0, "\033Ob", KEYC_DOWN|KEYC_CTRL, TTYKEY_RAW },
{ 0, "\033Oc", KEYC_RIGHT|KEYC_CTRL, TTYKEY_RAW },
{ 0, "\033Od", KEYC_LEFT|KEYC_CTRL, TTYKEY_RAW },

{ 0, "\033[a", KEYC_UP|KEYC_SHIFT, TTYKEY_RAW },
{ 0, "\033[b", KEYC_DOWN|KEYC_SHIFT, TTYKEY_RAW },
{ 0, "\033[c", KEYC_RIGHT|KEYC_SHIFT, TTYKEY_RAW },
{ 0, "\033[d", KEYC_LEFT|KEYC_SHIFT, TTYKEY_RAW },

/*
* rxvt-style function + modifier keys:
* Ctrl = ^, Shift = $, Ctrl+Shift = @
*/
{ 0, "\033[11^", KEYC_F1|KEYC_CTRL, TTYKEY_RAW },
{ 0, "\033[12^", KEYC_F2|KEYC_CTRL, TTYKEY_RAW },
{ 0, "\033[13^", KEYC_F3|KEYC_CTRL, TTYKEY_RAW },
{ 0, "\033[14^", KEYC_F4|KEYC_CTRL, TTYKEY_RAW },
{ 0, "\033[15^", KEYC_F5|KEYC_CTRL, TTYKEY_RAW },
{ 0, "\033[17^", KEYC_F6|KEYC_CTRL, TTYKEY_RAW },
{ 0, "\033[18^", KEYC_F7|KEYC_CTRL, TTYKEY_RAW },
{ 0, "\033[19^", KEYC_F8|KEYC_CTRL, TTYKEY_RAW },
{ 0, "\033[20^", KEYC_F9|KEYC_CTRL, TTYKEY_RAW },
{ 0, "\033[21^", KEYC_F10|KEYC_CTRL, TTYKEY_RAW },
{ 0, "\033[23^", KEYC_F11|KEYC_CTRL, TTYKEY_RAW },
{ 0, "\033[24^", KEYC_F12|KEYC_CTRL, TTYKEY_RAW },
{ 0, "\033[25^", KEYC_F13|KEYC_CTRL, TTYKEY_RAW },
{ 0, "\033[26^", KEYC_F14|KEYC_CTRL, TTYKEY_RAW },
{ 0, "\033[28^", KEYC_F15|KEYC_CTRL, TTYKEY_RAW },
{ 0, "\033[29^", KEYC_F16|KEYC_CTRL, TTYKEY_RAW },
{ 0, "\033[31^", KEYC_F17|KEYC_CTRL, TTYKEY_RAW },
{ 0, "\033[32^", KEYC_F18|KEYC_CTRL, TTYKEY_RAW },
{ 0, "\033[33^", KEYC_F19|KEYC_CTRL, TTYKEY_RAW },
{ 0, "\033[34^", KEYC_F20|KEYC_CTRL, TTYKEY_RAW },
{ 0, "\033[2^", KEYC_IC|KEYC_CTRL, TTYKEY_RAW },
{ 0, "\033[3^", KEYC_DC|KEYC_CTRL, TTYKEY_RAW },
{ 0, "\033[7^", KEYC_HOME|KEYC_CTRL, TTYKEY_RAW },
{ 0, "\033[8^", KEYC_END|KEYC_CTRL, TTYKEY_RAW },
{ 0, "\033[6^", KEYC_NPAGE|KEYC_CTRL, TTYKEY_RAW },
{ 0, "\033[5^", KEYC_PPAGE|KEYC_CTRL, TTYKEY_RAW },

{ 0, "\033[11$", KEYC_F1|KEYC_SHIFT, TTYKEY_RAW },
{ 0, "\033[12$", KEYC_F2|KEYC_SHIFT, TTYKEY_RAW },
{ 0, "\033[13$", KEYC_F3|KEYC_SHIFT, TTYKEY_RAW },
{ 0, "\033[14$", KEYC_F4|KEYC_SHIFT, TTYKEY_RAW },
{ 0, "\033[15$", KEYC_F5|KEYC_SHIFT, TTYKEY_RAW },
{ 0, "\033[17$", KEYC_F6|KEYC_SHIFT, TTYKEY_RAW },
{ 0, "\033[18$", KEYC_F7|KEYC_SHIFT, TTYKEY_RAW },
{ 0, "\033[19$", KEYC_F8|KEYC_SHIFT, TTYKEY_RAW },
{ 0, "\033[20$", KEYC_F9|KEYC_SHIFT, TTYKEY_RAW },
{ 0, "\033[21$", KEYC_F10|KEYC_SHIFT, TTYKEY_RAW },
{ 0, "\033[23$", KEYC_F11|KEYC_SHIFT, TTYKEY_RAW },
{ 0, "\033[24$", KEYC_F12|KEYC_SHIFT, TTYKEY_RAW },
{ 0, "\033[25$", KEYC_F13|KEYC_SHIFT, TTYKEY_RAW },
{ 0, "\033[26$", KEYC_F14|KEYC_SHIFT, TTYKEY_RAW },
{ 0, "\033[28$", KEYC_F15|KEYC_SHIFT, TTYKEY_RAW },
{ 0, "\033[29$", KEYC_F16|KEYC_SHIFT, TTYKEY_RAW },
{ 0, "\033[31$", KEYC_F17|KEYC_SHIFT, TTYKEY_RAW },
{ 0, "\033[32$", KEYC_F18|KEYC_SHIFT, TTYKEY_RAW },
{ 0, "\033[33$", KEYC_F19|KEYC_SHIFT, TTYKEY_RAW },
{ 0, "\033[34$", KEYC_F20|KEYC_SHIFT, TTYKEY_RAW },
{ 0, "\033[2$", KEYC_IC|KEYC_SHIFT, TTYKEY_RAW },
{ 0, "\033[3$", KEYC_DC|KEYC_SHIFT, TTYKEY_RAW },
{ 0, "\033[7$", KEYC_HOME|KEYC_SHIFT, TTYKEY_RAW },
{ 0, "\033[8$", KEYC_END|KEYC_SHIFT, TTYKEY_RAW },
{ 0, "\033[6$", KEYC_NPAGE|KEYC_SHIFT, TTYKEY_RAW },
{ 0, "\033[5$", KEYC_PPAGE|KEYC_SHIFT, TTYKEY_RAW },

{ 0, "\033[11@", KEYC_F1|KEYC_CTRL|KEYC_SHIFT, TTYKEY_RAW },
{ 0, "\033[12@", KEYC_F2|KEYC_CTRL|KEYC_SHIFT, TTYKEY_RAW },
{ 0, "\033[13@", KEYC_F3|KEYC_CTRL|KEYC_SHIFT, TTYKEY_RAW },
{ 0, "\033[14@", KEYC_F4|KEYC_CTRL|KEYC_SHIFT, TTYKEY_RAW },
{ 0, "\033[15@", KEYC_F5|KEYC_CTRL|KEYC_SHIFT, TTYKEY_RAW },
{ 0, "\033[17@", KEYC_F6|KEYC_CTRL|KEYC_SHIFT, TTYKEY_RAW },
{ 0, "\033[18@", KEYC_F7|KEYC_CTRL|KEYC_SHIFT, TTYKEY_RAW },
{ 0, "\033[19@", KEYC_F8|KEYC_CTRL|KEYC_SHIFT, TTYKEY_RAW },
{ 0, "\033[20@", KEYC_F9|KEYC_CTRL|KEYC_SHIFT, TTYKEY_RAW },
{ 0, "\033[21@", KEYC_F10|KEYC_CTRL|KEYC_SHIFT, TTYKEY_RAW },
{ 0, "\033[23@", KEYC_F11|KEYC_CTRL|KEYC_SHIFT, TTYKEY_RAW },
{ 0, "\033[24@", KEYC_F12|KEYC_CTRL|KEYC_SHIFT, TTYKEY_RAW },
{ 0, "\033[25@", KEYC_F13|KEYC_CTRL|KEYC_SHIFT, TTYKEY_RAW },
{ 0, "\033[26@", KEYC_F14|KEYC_CTRL|KEYC_SHIFT, TTYKEY_RAW },
{ 0, "\033[28@", KEYC_F15|KEYC_CTRL|KEYC_SHIFT, TTYKEY_RAW },
{ 0, "\033[29@", KEYC_F16|KEYC_CTRL|KEYC_SHIFT, TTYKEY_RAW },
{ 0, "\033[31@", KEYC_F17|KEYC_CTRL|KEYC_SHIFT, TTYKEY_RAW },
{ 0, "\033[32@", KEYC_F18|KEYC_CTRL|KEYC_SHIFT, TTYKEY_RAW },
{ 0, "\033[33@", KEYC_F19|KEYC_CTRL|KEYC_SHIFT, TTYKEY_RAW },
{ 0, "\033[34@", KEYC_F20|KEYC_CTRL|KEYC_SHIFT, TTYKEY_RAW },
{ 0, "\033[2@", KEYC_IC|KEYC_CTRL|KEYC_SHIFT, TTYKEY_RAW },
{ 0, "\033[3@", KEYC_DC|KEYC_CTRL|KEYC_SHIFT, TTYKEY_RAW },
{ 0, "\033[7@", KEYC_HOME|KEYC_CTRL|KEYC_SHIFT, TTYKEY_RAW },
{ 0, "\033[8@", KEYC_END|KEYC_CTRL|KEYC_SHIFT, TTYKEY_RAW },
{ 0, "\033[6@", KEYC_NPAGE|KEYC_CTRL|KEYC_SHIFT,TTYKEY_RAW },
{ 0, "\033[5@", KEYC_PPAGE|KEYC_CTRL|KEYC_SHIFT,TTYKEY_RAW },

/* terminfo lookups below this line so they can override raw keys. */

/* Function keys. */
{ TTYC_KF1, NULL, KEYC_F1, 0 },
{ TTYC_KF2, NULL, KEYC_F2, 0 },
{ TTYC_KF3, NULL, KEYC_F3, 0 },
{ TTYC_KF4, NULL, KEYC_F4, 0 },
{ TTYC_KF5, NULL, KEYC_F5, 0 },
{ TTYC_KF6, NULL, KEYC_F6, 0 },
{ TTYC_KF7, NULL, KEYC_F7, 0 },
{ TTYC_KF8, NULL, KEYC_F8, 0 },
{ TTYC_KF9, NULL, KEYC_F9, 0 },
{ TTYC_KF10, NULL, KEYC_F10, 0 },
{ TTYC_KF11, NULL, KEYC_F11, 0 },
{ TTYC_KF12, NULL, KEYC_F12, 0 },
{ TTYC_KF13, NULL, KEYC_F13, 0 },
{ TTYC_KF14, NULL, KEYC_F14, 0 },
{ TTYC_KF15, NULL, KEYC_F15, 0 },
{ TTYC_KF16, NULL, KEYC_F16, 0 },
{ TTYC_KF17, NULL, KEYC_F17, 0 },
{ TTYC_KF18, NULL, KEYC_F18, 0 },
{ TTYC_KF19, NULL, KEYC_F19, 0 },
{ TTYC_KF20, NULL, KEYC_F20, 0 },
{ TTYC_KICH1, NULL, KEYC_IC, 0 },
{ TTYC_KDCH1, NULL, KEYC_DC, 0 },
{ TTYC_KHOME, NULL, KEYC_HOME, 0 },
{ TTYC_KEND, NULL, KEYC_END, 0 },
{ TTYC_KNP, NULL, KEYC_NPAGE, 0 },
{ TTYC_KPP, NULL, KEYC_PPAGE, 0 },
{ TTYC_KCBT, NULL, KEYC_BTAB, 0 },

/* Arrow keys from terminfo. */
{ TTYC_KCUU1, NULL, KEYC_UP, 0 },
{ TTYC_KCUD1, NULL, KEYC_DOWN, 0 },
{ TTYC_KCUB1, NULL, KEYC_LEFT, 0 },
{ TTYC_KCUF1, NULL, KEYC_RIGHT, 0 },

/* Key and modifier capabilities. */
{ TTYC_KDC2, NULL, KEYC_DC|KEYC_SHIFT, 0 },
{ TTYC_KDC3, NULL, KEYC_DC|KEYC_ESCAPE, 0 },
{ TTYC_KDC4, NULL, KEYC_DC|KEYC_SHIFT|KEYC_ESCAPE, 0 },
{ TTYC_KDC5, NULL, KEYC_DC|KEYC_CTRL, 0 },
{ TTYC_KDC6, NULL, KEYC_DC|KEYC_SHIFT|KEYC_CTRL, 0 },
{ TTYC_KDC7, NULL, KEYC_DC|KEYC_ESCAPE|KEYC_CTRL, 0 },
{ TTYC_KDN2, NULL, KEYC_DOWN|KEYC_SHIFT, 0 },
{ TTYC_KDN3, NULL, KEYC_DOWN|KEYC_ESCAPE, 0 },
{ TTYC_KDN4, NULL, KEYC_DOWN|KEYC_SHIFT|KEYC_ESCAPE, 0 },
{ TTYC_KDN5, NULL, KEYC_DOWN|KEYC_CTRL, 0 },
{ TTYC_KDN6, NULL, KEYC_DOWN|KEYC_SHIFT|KEYC_CTRL, 0 },
{ TTYC_KDN7, NULL, KEYC_DOWN|KEYC_ESCAPE|KEYC_CTRL, 0 },
{ TTYC_KEND2, NULL, KEYC_END|KEYC_SHIFT, 0 },
{ TTYC_KEND3, NULL, KEYC_END|KEYC_ESCAPE, 0 },
{ TTYC_KEND4, NULL, KEYC_END|KEYC_SHIFT|KEYC_ESCAPE, 0 },
{ TTYC_KEND5, NULL, KEYC_END|KEYC_CTRL, 0 },
{ TTYC_KEND6, NULL, KEYC_END|KEYC_SHIFT|KEYC_CTRL, 0 },
{ TTYC_KEND7, NULL, KEYC_END|KEYC_ESCAPE|KEYC_CTRL, 0 },
{ TTYC_KHOM2, NULL, KEYC_HOME|KEYC_SHIFT, 0 },
{ TTYC_KHOM3, NULL, KEYC_HOME|KEYC_ESCAPE, 0 },
{ TTYC_KHOM4, NULL, KEYC_HOME|KEYC_SHIFT|KEYC_ESCAPE, 0 },
{ TTYC_KHOM5, NULL, KEYC_HOME|KEYC_CTRL, 0 },
{ TTYC_KHOM6, NULL, KEYC_HOME|KEYC_SHIFT|KEYC_CTRL, 0 },
{ TTYC_KHOM7, NULL, KEYC_HOME|KEYC_ESCAPE|KEYC_CTRL, 0 },
{ TTYC_KIC2, NULL, KEYC_IC|KEYC_SHIFT, 0 },
{ TTYC_KIC3, NULL, KEYC_IC|KEYC_ESCAPE, 0 },
{ TTYC_KIC4, NULL, KEYC_IC|KEYC_SHIFT|KEYC_ESCAPE, 0 },
{ TTYC_KIC5, NULL, KEYC_IC|KEYC_CTRL, 0 },
{ TTYC_KIC6, NULL, KEYC_IC|KEYC_SHIFT|KEYC_CTRL, 0 },
{ TTYC_KIC7, NULL, KEYC_IC|KEYC_ESCAPE|KEYC_CTRL, 0 },
{ TTYC_KLFT2, NULL, KEYC_LEFT|KEYC_SHIFT, 0 },
{ TTYC_KLFT3, NULL, KEYC_LEFT|KEYC_ESCAPE, 0 },
{ TTYC_KLFT4, NULL, KEYC_LEFT|KEYC_SHIFT|KEYC_ESCAPE, 0 },
{ TTYC_KLFT5, NULL, KEYC_LEFT|KEYC_CTRL, 0 },
{ TTYC_KLFT6, NULL, KEYC_LEFT|KEYC_SHIFT|KEYC_CTRL, 0 },
{ TTYC_KLFT7, NULL, KEYC_LEFT|KEYC_ESCAPE|KEYC_CTRL, 0 },
{ TTYC_KNXT2, NULL, KEYC_NPAGE|KEYC_SHIFT, 0 },
{ TTYC_KNXT3, NULL, KEYC_NPAGE|KEYC_ESCAPE, 0 },
{ TTYC_KNXT4, NULL, KEYC_NPAGE|KEYC_SHIFT|KEYC_ESCAPE, 0 },
{ TTYC_KNXT5, NULL, KEYC_NPAGE|KEYC_CTRL, 0 },
{ TTYC_KNXT6, NULL, KEYC_NPAGE|KEYC_SHIFT|KEYC_CTRL, 0 },
{ TTYC_KNXT7, NULL, KEYC_NPAGE|KEYC_ESCAPE|KEYC_CTRL, 0 },
{ TTYC_KPRV2, NULL, KEYC_PPAGE|KEYC_SHIFT, 0 },
{ TTYC_KPRV3, NULL, KEYC_PPAGE|KEYC_ESCAPE, 0 },
{ TTYC_KPRV4, NULL, KEYC_PPAGE|KEYC_SHIFT|KEYC_ESCAPE, 0 },
{ TTYC_KPRV5, NULL, KEYC_PPAGE|KEYC_CTRL, 0 },
{ TTYC_KPRV6, NULL, KEYC_PPAGE|KEYC_SHIFT|KEYC_CTRL, 0 },
{ TTYC_KPRV7, NULL, KEYC_PPAGE|KEYC_ESCAPE|KEYC_CTRL, 0 },
{ TTYC_KRIT2, NULL, KEYC_RIGHT|KEYC_SHIFT, 0 },
{ TTYC_KRIT3, NULL, KEYC_RIGHT|KEYC_ESCAPE, 0 },
{ TTYC_KRIT4, NULL, KEYC_RIGHT|KEYC_SHIFT|KEYC_ESCAPE, 0 },
{ TTYC_KRIT5, NULL, KEYC_RIGHT|KEYC_CTRL, 0 },
{ TTYC_KRIT6, NULL, KEYC_RIGHT|KEYC_SHIFT|KEYC_CTRL, 0 },
{ TTYC_KRIT7, NULL, KEYC_RIGHT|KEYC_ESCAPE|KEYC_CTRL, 0 },
{ TTYC_KUP2, NULL, KEYC_UP|KEYC_SHIFT, 0 },
{ TTYC_KUP3, NULL, KEYC_UP|KEYC_ESCAPE, 0 },
{ TTYC_KUP4, NULL, KEYC_UP|KEYC_SHIFT|KEYC_ESCAPE, 0 },
{ TTYC_KUP5, NULL, KEYC_UP|KEYC_CTRL, 0 },
{ TTYC_KUP6, NULL, KEYC_UP|KEYC_SHIFT|KEYC_CTRL, 0 },
{ TTYC_KUP7, NULL, KEYC_UP|KEYC_ESCAPE|KEYC_CTRL, 0 },
};

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_init(struct tty *tty)
{
const struct tty_key_ent *tke;
u_int i;
const char *s;

tty->key_tree = NULL;
for (i = 0; i < nitems(tty_keys); i++) {
tke = &tty_keys[i];

if (tke->flags & TTYKEY_RAW)
s = tke->string;
else {
if (!tty_term_has(tty->term, tke->code))
continue;
s = tty_term_string(tty->term, tke->code);
}
if (s[0] != '\033' || s[1] == '\0')
continue;

tty_keys_add(tty, s + 1, tke->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);
xfree(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;
struct mouse_event mouse;
const char *buf;
size_t len, size;
cc_t bspace;
int key, delay;

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);

/* If a normal key, return it. */
if (*buf != '\033') {
key = (u_char) *buf;
evbuffer_drain(tty->event->input, 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 handle_key;
}

/* Is this a mouse key press? */
switch (tty_keys_mouse(tty, buf, len, &size, &mouse)) {
case 0: /* yes */
evbuffer_drain(tty->event->input, size);
key = KEYC_MOUSE;
goto handle_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 */
evbuffer_drain(tty->event->input, size);
goto handle_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 + 1, len - 1, &size);
if (tk != NULL) {
key = tk->key;
goto found_key;
}

/* Skip the escape. */
buf++;
len--;

/* Is there a normal key following? */
if (len != 0 && *buf != '\033') {
key = *buf | KEYC_ESCAPE;
evbuffer_drain(tty->event->input, 2);
goto handle_key;
}

/* Or a key string? */
if (len > 1) {
tk = tty_keys_find(tty, buf + 1, len - 1, &size);
if (tk != NULL) {
key = tk->key | KEYC_ESCAPE;
size++; /* include escape */
goto found_key;
}
}

/* Escape and then nothing useful - fall through. */

partial_key:
/*
* Escape but no key string. If have already seen an escape, then the
* timer must have expired, so give up waiting and send the escape.
*/
if (tty->flags & TTY_ESCAPE) {
evbuffer_drain(tty->event->input, 1);
key = '\033';
goto handle_key;
}

/* Fall through to start the timer. */

start_timer:
/* Start the timer and wait for expiry or more data. */
delay = options_get_number(&global_options, "escape-time");
tv.tv_sec = delay / 1000;
tv.tv_usec = (delay % 1000) * 1000L;

evtimer_del(&tty->key_timer);
evtimer_set(&tty->key_timer, tty_keys_callback, tty);
evtimer_add(&tty->key_timer, &tv);

tty->flags |= TTY_ESCAPE;
return (0);

found_key:
if (tk->next != NULL) {
/* Partial key. Start the timer if not already expired. */
if (!(tty->flags & TTY_ESCAPE))
goto start_timer;

/* Otherwise, if no key, send the escape alone. */
if (tk->key == KEYC_NONE)
goto partial_key;

/* Or fall through to send the partial key found. */
}
evbuffer_drain(tty->event->input, size + 1);

goto handle_key;

handle_key:
evtimer_del(&tty->key_timer);

tty->key_callback(key, &mouse, tty->key_data);

tty->flags &= ~TTY_ESCAPE;
return (1);
}

/* Key timer callback. */
/* ARGSUSED */
void
tty_keys_callback(unused int fd, unused short events, void *data)
{
struct tty *tty = data;

if (!(tty->flags & TTY_ESCAPE))
return;

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)
{
struct utf8_data utf8data;
u_int i, value;

/*
* Standard mouse sequences are \033[M followed by three characters
* indicating buttons, 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.
*/

*size = 0;

/* First three bytes are always \033[M. */
if (buf[0] != '\033')
return (-1);
if (len == 1)
return (1);
if (buf[1] != '[')
return (-1);
if (len == 2)
return (1);
if (buf[2] != 'M')
return (-1);
if (len == 3)
return (1);

/* 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 = (unsigned char)buf[*size];
(*size)++;
} else {
value = (unsigned char)buf[*size];
(*size)++;
}

if (i == 0)
m->b = value;
else if (i == 1)
m->x = value;
else
m->y = value;
}
log_debug("mouse input: %.*s", (int) *size, buf);

/* Check and return the mouse input. */
if (m->b < 32 || m->x < 33 || m->y < 33)
return (-1);
m->b -= 32;
m->x -= 33;
m->y -= 33;
log_debug("mouse position: x=%u y=%u b=%u", m->x, m->y, m->b);
return (0);
}
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