mc/lib/tty/key.c

/* Keyboard support routines.

   Copyright (C) 1994, 1995, 1998, 1999, 2000, 2001, 2002, 2003, 2004,
   2005, 2006, 2007, 2009, 2010 Free Software Foundation, Inc.

   Written by: 1994, 1995 Miguel de Icaza.
	       1994, 1995 Janne Kukonlehto.
	       1995  Jakub Jelinek.
	       1997  Norbert Warmuth

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */

/** \file key.c
 *  \brief Source: keyboard support routines
 */

#include <config.h>

#include <ctype.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/time.h>
#include <sys/types.h>
#include <unistd.h>

#include "lib/global.h"
#include "lib/strutil.h"  /* str_casecmp */

#include "lib/vfs/mc-vfs/vfs.h"

#include "tty.h"
#include "tty-internal.h" /* mouse_enabled */
#include "mouse.h"
#include "key.h"
#include "win.h"  /* xterm_flag */

#include "src/main.h"
#include "src/layout.h"   /* winch_flag, mc_refresh() */
#include "src/consaver/cons.saver.h"


#ifdef HAVE_TEXTMODE_X11_SUPPORT
#include "x11conn.h"
#endif

#ifdef __linux__
#if defined(__GLIBC__) && (__GLIBC__ < 2)
#   include <linux/termios.h>   /* TIOCLINUX */
#else
#   include <termios.h>
#endif
#include <sys/ioctl.h>
#endif /* __linux__ */

#ifdef __CYGWIN__
#include <termios.h>
#include <sys/ioctl.h>
#endif /* __CYGWIN__ */

#ifdef __QNXNTO__
#include <dlfcn.h>
#include <Ph.h>
#include <sys/dcmd_chr.h>
#endif /* __QNXNTO__ */

/*** global variables **************************************************/

/* If true, use + and \ keys normally and select/unselect do if M-+ / M-\.
   and M-- and keypad + / - */
int alternate_plus_minus = 0;

int mou_auto_repeat = 100;
int double_click_speed = 250;
int old_esc_mode = 0;
int use_8th_bit_as_meta = 0;

/* This table is a mapping between names and the constants we use
 * We use this to allow users to define alternate definitions for
 * certain keys that may be missing from the terminal database
 */
const key_code_name_t key_name_conv_tab[] = {
    /* KEY_F(0) is not here, since we are mapping it to f10, so there is no reason
	to define f0 as well. Also, it makes Learn keys a bunch of problems :( */
    { KEY_F (1),	"f1",		N_("Function key 1"),	"F1" },
    { KEY_F (2),	"f2",		N_("Function key 2"),	"F2" },
    { KEY_F (3),	"f3",		N_("Function key 3"),	"F3" },
    { KEY_F (4),	"f4",		N_("Function key 4"),	"F4" },
    { KEY_F (5),	"f5",		N_("Function key 5"),	"F5" },
    { KEY_F (6),	"f6",		N_("Function key 6"),	"F6" },
    { KEY_F (7),	"f7",		N_("Function key 7"),	"F7" },
    { KEY_F (8),	"f8",		N_("Function key 8"),	"F8" },
    { KEY_F (9),	"f9",		N_("Function key 9"),	"F9" },
    { KEY_F (10),	"f10",		N_("Function key 10"),	"F10" },
    { KEY_F (11),	"f11",		N_("Function key 11"),	"F11" },
    { KEY_F (12),	"f12",		N_("Function key 12"),	"F12" },
    { KEY_F (13),	"f13",		N_("Function key 13"),	"F13" },
    { KEY_F (14),	"f14",		N_("Function key 14"),	"F14" },
    { KEY_F (15),	"f15",		N_("Function key 15"),	"F15" },
    { KEY_F (16),	"f16",		N_("Function key 16"),	"F16" },
    { KEY_F (17),	"f17",		N_("Function key 17"),	"F17" },
    { KEY_F (18),	"f18",		N_("Function key 18"),	"F18" },
    { KEY_F (19),	"f19",		N_("Function key 19"),	"F19" },
    { KEY_F (20),	"f20",		N_("Function key 20"),	"F20" },
    { KEY_BACKSPACE,	"backspace",	N_("Backspace key"),	"Backspace" },
    { KEY_END,		"end",		N_("End key"),		"End" },
    { KEY_UP,		"up",		N_("Up arrow key"),	"Up" },
    { KEY_DOWN,		"down",		N_("Down arrow key"),	"Down" },
    { KEY_LEFT,		"left",		N_("Left arrow key"),	"Left" },
    { KEY_RIGHT,	"right",	N_("Right arrow key"),	"Right" },
    { KEY_HOME,		"home",		N_("Home key"),		"Home" },
    { KEY_NPAGE,	"pgdn",		N_("Page Down key"),	"PgDn" },
    { KEY_PPAGE,	"pgup",		N_("Page Up key"),	"PgUp" },
    { KEY_IC,		"insert",	N_("Insert key"),	"Ins" },
    { KEY_DC,		"delete",	N_("Delete key"),	"Del" },
    { ALT ('\t'),	"complete",	N_("Completion/M-tab"),	"Meta-Tab" },
    { KEY_KP_ADD,	"kpplus",	N_("+ on keypad"),	"+" },
    { KEY_KP_SUBTRACT,	"kpminus",	N_("- on keypad"),	"-" },
    { (int) '/',	"kpslash",	N_("Slash on keypad"),	"/" },
    { KEY_KP_MULTIPLY,	"kpasterisk",	N_("* on keypad"),	"*" },

    /* From here on, these won't be shown in Learn keys (no space) */
    { ESC_CHAR,		"escape",	N_("Escape key"),		"Esc" },
    { KEY_LEFT,		"kpleft",	N_("Left arrow keypad"),	"Left" },
    { KEY_RIGHT,	"kpright",	N_("Right arrow keypad"),	"Right" },
    { KEY_UP,		"kpup",		N_("Up arrow keypad"),		"Up" },
    { KEY_DOWN,		"kpdown",	N_("Down arrow keypad"),	"Down" },
    { KEY_HOME,		"kphome",	N_("Home on keypad"),		"Home" },
    { KEY_END,		"kpend",	N_("End on keypad"),		"End" },
    { KEY_NPAGE,	"kpnpage",	N_("Page Down keypad"),		"PgDn" },
    { KEY_PPAGE,	"kpppage",	N_("Page Up keypad"),		"PgUp" },
    { KEY_IC,		"kpinsert",	N_("Insert on keypad"),		"Ins" },
    { KEY_DC,		"kpdelete",	N_("Delete on keypad"),		"Del" },
    { (int) '\n',	"kpenter",	N_("Enter on keypad"),		"Enter" },
    { KEY_F (21),	"f21",		N_("Function key 21"),		"F21" },
    { KEY_F (22),	"f22",		N_("Function key 22"),		"F22" },
    { KEY_F (23),	"f23",		N_("Function key 23"),		"F23" },
    { KEY_F (24),	"f24",		N_("Function key 24"),		"F24" },
    { KEY_A1,		"a1",		N_("A1 key"),			"A1" },
    { KEY_C1,		"c1",		N_("C1 key"),			"C1" },

    /* Alternative label */
    { ESC_CHAR,		"esc",		N_("Escape key"),	"Esc" },
    { KEY_BACKSPACE,	"bs",		N_("Backspace key"),	"Bakspace" },
    { KEY_IC,		"ins",		N_("Insert key"),	"Ins" },
    { KEY_DC,		"del",		N_("Delete key"),	"Del" },
    { (int) '+',	"plus",		N_("Plus"),		"+" },
    { (int) '-',	"minus",	N_("Minus"),		"-" },
    { (int) '*',	"asterisk",	N_("Asterisk"),		"*" },
    { (int) '.',	"dot",		N_("Dot"),		"." },
    { (int) '<',	"lt",		N_("Less than"),	"<" },
    { (int) '>',	"gt",		N_("Great than"),	">" },
    { (int) '=',	"equal",	N_("Equal"),		"=" },
    { (int) ',',	"comma",	N_("Comma"),		"," },
    { (int) '\'',	"apostrophe",	N_("Apostrophe"),	"\'" },
    { (int) ':',	"colon",	N_("Colon"),		":" },
    { (int) '!',	"exclamation",	N_("Exclamation mark"),	"!" },
    { (int) '?',	"question",	N_("Question mark"),	"?" },
    { (int) '&',	"ampersand",	N_("Ampersand"),	"&" },
    { (int) '$',	"dollar",	N_("Dollar sign"),	"$" },
    { (int) '"',	"quota",	N_("Quotation mark"),	"\"" },
    { (int) '^',	"caret",	N_("Caret"),		"^" },
    { (int) '~',	"tilda",	N_("Tilda"),		"~" },
    { (int) '`',	"prime",	N_("Prime"),		"`" },
    { (int) '_',	"underline",	N_("Underline"),	"_" },
    { (int) '_',	"understrike",	N_("Understrike"),	"_" },
    { (int) '|',	"pipe",		N_("Pipe"),		"|" },
    { (int) '(',	"lparenthesis",	N_("Left parenthesis"),	"(" },
    { (int) ')',	"rparenthesis",	N_("Right parenthesis"),	")" },
    { (int) '[',	"lbracket",	N_("Left bracket"),	"[" },
    { (int) ']',	"rbracket",	N_("Right bracket"),	"]" },
    { (int) '{',	"lbrace",	N_("Left brace"),	"{" },
    { (int) '}',	"rbrace",	N_("Right brace"),	"}" },
    { (int) '\n',	"enter",	N_("Enter"),		"Enter" },
    { (int) '\t',	"tab",		N_("Tab key"),		"Tab" },
    { (int) ' ',	"space",	N_("Space key"),	"Space" },
    { (int) '/',	"slash",	N_("Slash key"),	"/" },
    { (int) '\\',	"backslash",	N_("Backslash key"),	"\\" },
    { (int) '#',	"number",	N_("Number sign #"),	"#" },
    { (int) '#',	"hash",		N_("Number sign #"),	"#" },
    /* TRANSLATORS: Please translate as in "at sign" (@). */
    { (int) '@',	"at",		N_("At sign"),		"@" },

    /* meta keys */
    { KEY_M_CTRL,	"control",	N_("Ctrl"),	"C" },
    { KEY_M_CTRL,	"ctrl",		N_("Ctrl"),	"C" },
    { KEY_M_ALT,	"meta",		N_("Alt"),	"M" },
    { KEY_M_ALT,	"alt",		N_("Alt"),	"M" },
    { KEY_M_ALT,	"ralt",		N_("Alt"),	"M" },
    { KEY_M_SHIFT,	"shift",	N_("Shift"),	"S" },

    { 0, NULL, NULL, NULL }
};


/*** file scope macro definitions **************************************/

#define GET_TIME(tv)		(gettimeofday(&tv, (struct timezone *) NULL))
#define DIF_TIME(t1, t2)	((t2.tv_sec  - t1.tv_sec) * 1000 + (t2.tv_usec - t1.tv_usec)/1000)

/* The maximum sequence length (32 + null terminator) */
#define SEQ_BUFFER_LEN 33

/*** file scope type declarations **************************************/

/* Linux console keyboard modifiers */
typedef enum {
    SHIFT_PRESSED = (1 << 0),
    ALTR_PRESSED = (1 << 1),
    CONTROL_PRESSED = (1 << 2),
    ALTL_PRESSED = (1 << 3)
} mod_pressed_t;

typedef struct key_def {
    char ch;                    /* Holds the matching char code */
    int code;                   /* The code returned, valid if child == NULL */
    struct key_def *next;
    struct key_def *child;      /* sequence continuation */
    int action;                 /* optional action to be done. Now used only
                                   to mark that we are just after the first
                                   Escape */
} key_def;

typedef struct {
    int code;
    const char *seq;
    int action;
} key_define_t;

/* File descriptor monitoring add/remove routines */
typedef struct SelectList {
    int fd;
    select_fn callback;
    void *info;
    struct SelectList *next;
} SelectList;

#ifdef __QNXNTO__
typedef int (*ph_dv_f) (void *, void *);
typedef int (*ph_ov_f) (void *);
typedef int (*ph_pqc_f) (unsigned short, PhCursorInfo_t *);
#endif

/*** file scope variables **********************************************/

static key_define_t mc_default_keys[] = {
    {ESC_CHAR, ESC_STR, MCKEY_ESCAPE},
    {ESC_CHAR, ESC_STR ESC_STR, MCKEY_NOACTION},
    {0, NULL, MCKEY_NOACTION},
};

/* Broken terminfo and termcap databases on xterminals */
static key_define_t xterm_key_defines[] = {
    {KEY_F (1), ESC_STR "OP", MCKEY_NOACTION},
    {KEY_F (2), ESC_STR "OQ", MCKEY_NOACTION},
    {KEY_F (3), ESC_STR "OR", MCKEY_NOACTION},
    {KEY_F (4), ESC_STR "OS", MCKEY_NOACTION},
    {KEY_F (1), ESC_STR "[11~", MCKEY_NOACTION},
    {KEY_F (2), ESC_STR "[12~", MCKEY_NOACTION},
    {KEY_F (3), ESC_STR "[13~", MCKEY_NOACTION},
    {KEY_F (4), ESC_STR "[14~", MCKEY_NOACTION},
    {KEY_F (5), ESC_STR "[15~", MCKEY_NOACTION},
    {KEY_F (6), ESC_STR "[17~", MCKEY_NOACTION},
    {KEY_F (7), ESC_STR "[18~", MCKEY_NOACTION},
    {KEY_F (8), ESC_STR "[19~", MCKEY_NOACTION},
    {KEY_F (9), ESC_STR "[20~", MCKEY_NOACTION},
    {KEY_F (10), ESC_STR "[21~", MCKEY_NOACTION},

    /* old xterm Shift-arrows */
    {KEY_M_SHIFT | KEY_UP, ESC_STR "O2A", MCKEY_NOACTION},
    {KEY_M_SHIFT | KEY_DOWN, ESC_STR "O2B", MCKEY_NOACTION},
    {KEY_M_SHIFT | KEY_RIGHT, ESC_STR "O2C", MCKEY_NOACTION},
    {KEY_M_SHIFT | KEY_LEFT, ESC_STR "O2D", MCKEY_NOACTION},

    /* new xterm Shift-arrows */
    {KEY_M_SHIFT | KEY_UP, ESC_STR "[1;2A", MCKEY_NOACTION},
    {KEY_M_SHIFT | KEY_DOWN, ESC_STR "[1;2B", MCKEY_NOACTION},
    {KEY_M_SHIFT | KEY_RIGHT, ESC_STR "[1;2C", MCKEY_NOACTION},
    {KEY_M_SHIFT | KEY_LEFT, ESC_STR "[1;2D", MCKEY_NOACTION},

    /* more xterm keys with modifiers */
    {KEY_M_CTRL | KEY_PPAGE, ESC_STR "[5;5~", MCKEY_NOACTION},
    {KEY_M_CTRL | KEY_NPAGE, ESC_STR "[6;5~", MCKEY_NOACTION},
    {KEY_M_CTRL | KEY_IC, ESC_STR "[2;5~", MCKEY_NOACTION},
    {KEY_M_CTRL | KEY_DC, ESC_STR "[3;5~", MCKEY_NOACTION},
    {KEY_M_CTRL | KEY_HOME, ESC_STR "[1;5H", MCKEY_NOACTION},
    {KEY_M_CTRL | KEY_END, ESC_STR "[1;5F", MCKEY_NOACTION},
    {KEY_M_SHIFT | KEY_HOME, ESC_STR "[1;2H", MCKEY_NOACTION},
    {KEY_M_SHIFT | KEY_END, ESC_STR "[1;2F", MCKEY_NOACTION},
    {KEY_M_CTRL | KEY_UP, ESC_STR "[1;5A", MCKEY_NOACTION},
    {KEY_M_CTRL | KEY_DOWN, ESC_STR "[1;5B", MCKEY_NOACTION},
    {KEY_M_CTRL | KEY_RIGHT, ESC_STR "[1;5C", MCKEY_NOACTION},
    {KEY_M_CTRL | KEY_LEFT, ESC_STR "[1;5D", MCKEY_NOACTION},
    {KEY_M_SHIFT | KEY_IC, ESC_STR "[2;2~", MCKEY_NOACTION},
    {KEY_M_SHIFT | KEY_DC, ESC_STR "[3;2~", MCKEY_NOACTION},
    {KEY_M_SHIFT | KEY_M_CTRL | KEY_UP, ESC_STR "[1;6A", MCKEY_NOACTION},
    {KEY_M_SHIFT | KEY_M_CTRL | KEY_DOWN, ESC_STR "[1;6B", MCKEY_NOACTION},
    {KEY_M_SHIFT | KEY_M_CTRL | KEY_RIGHT, ESC_STR "[1;6C", MCKEY_NOACTION},
    {KEY_M_SHIFT | KEY_M_CTRL | KEY_LEFT, ESC_STR "[1;6D", MCKEY_NOACTION},

    /* putty */
    {KEY_M_SHIFT | KEY_M_CTRL | KEY_UP, ESC_STR "[[1;6A", MCKEY_NOACTION},
    {KEY_M_SHIFT | KEY_M_CTRL | KEY_DOWN, ESC_STR "[[1;6B", MCKEY_NOACTION},
    {KEY_M_SHIFT | KEY_M_CTRL | KEY_RIGHT, ESC_STR "[[1;6C", MCKEY_NOACTION},
    {KEY_M_SHIFT | KEY_M_CTRL | KEY_LEFT, ESC_STR "[[1;6D", MCKEY_NOACTION},

    /* putty alt-arrow keys */
    /* removed as source esc esc esc trouble */
    /*
       { KEY_M_ALT | KEY_UP,    ESC_STR ESC_STR "OA", MCKEY_NOACTION },
       { KEY_M_ALT | KEY_DOWN,  ESC_STR ESC_STR "OB", MCKEY_NOACTION },
       { KEY_M_ALT | KEY_RIGHT, ESC_STR ESC_STR "OC", MCKEY_NOACTION },
       { KEY_M_ALT | KEY_LEFT,  ESC_STR ESC_STR "OD", MCKEY_NOACTION },
       { KEY_M_ALT | KEY_PPAGE, ESC_STR ESC_STR "[5~", MCKEY_NOACTION },
       { KEY_M_ALT | KEY_NPAGE, ESC_STR ESC_STR "[6~", MCKEY_NOACTION },
       { KEY_M_ALT | KEY_HOME,  ESC_STR ESC_STR "[1~", MCKEY_NOACTION },
       { KEY_M_ALT | KEY_END,   ESC_STR ESC_STR "[4~", MCKEY_NOACTION },

       { KEY_M_CTRL | KEY_M_ALT | KEY_UP,    ESC_STR ESC_STR "[1;2A", MCKEY_NOACTION },
       { KEY_M_CTRL | KEY_M_ALT | KEY_DOWN,  ESC_STR ESC_STR "[1;2B", MCKEY_NOACTION },
       { KEY_M_CTRL | KEY_M_ALT | KEY_RIGHT, ESC_STR ESC_STR "[1;2C", MCKEY_NOACTION },
       { KEY_M_CTRL | KEY_M_ALT | KEY_LEFT,  ESC_STR ESC_STR "[1;2D", MCKEY_NOACTION },

       { KEY_M_CTRL | KEY_M_ALT | KEY_PPAGE, ESC_STR ESC_STR "[[5;5~", MCKEY_NOACTION },
       { KEY_M_CTRL | KEY_M_ALT | KEY_NPAGE, ESC_STR ESC_STR "[[6;5~", MCKEY_NOACTION },
       { KEY_M_CTRL | KEY_M_ALT | KEY_HOME,  ESC_STR ESC_STR "[1;5H", MCKEY_NOACTION },
       { KEY_M_CTRL | KEY_M_ALT | KEY_END,   ESC_STR ESC_STR "[1;5F", MCKEY_NOACTION },
     */
    /* xterm alt-arrow keys */
    {KEY_M_ALT | KEY_UP, ESC_STR "[1;3A", MCKEY_NOACTION},
    {KEY_M_ALT | KEY_DOWN, ESC_STR "[1;3B", MCKEY_NOACTION},
    {KEY_M_ALT | KEY_RIGHT, ESC_STR "[1;3C", MCKEY_NOACTION},
    {KEY_M_ALT | KEY_LEFT, ESC_STR "[1;3D", MCKEY_NOACTION},
    {KEY_M_ALT | KEY_PPAGE, ESC_STR "[5;3~", MCKEY_NOACTION},
    {KEY_M_ALT | KEY_NPAGE, ESC_STR "[6;3~", MCKEY_NOACTION},
    {KEY_M_ALT | KEY_HOME, ESC_STR "[1~", MCKEY_NOACTION},
    {KEY_M_ALT | KEY_END, ESC_STR "[4~", MCKEY_NOACTION},
    {KEY_M_CTRL | KEY_M_ALT | KEY_UP, ESC_STR "[1;7A", MCKEY_NOACTION},
    {KEY_M_CTRL | KEY_M_ALT | KEY_DOWN, ESC_STR "[1;7B", MCKEY_NOACTION},
    {KEY_M_CTRL | KEY_M_ALT | KEY_RIGHT, ESC_STR "[1;7C", MCKEY_NOACTION},
    {KEY_M_CTRL | KEY_M_ALT | KEY_LEFT, ESC_STR "[1;7D", MCKEY_NOACTION},
    {KEY_M_CTRL | KEY_M_ALT | KEY_PPAGE, ESC_STR "[5;7~", MCKEY_NOACTION},
    {KEY_M_CTRL | KEY_M_ALT | KEY_NPAGE, ESC_STR "[6;7~", MCKEY_NOACTION},
    {KEY_M_CTRL | KEY_M_ALT | KEY_HOME, ESC_STR "OH", MCKEY_NOACTION},
    {KEY_M_CTRL | KEY_M_ALT | KEY_END, ESC_STR "OF", MCKEY_NOACTION},

    /* rxvt keys with modifiers */
    {KEY_M_SHIFT | KEY_UP, ESC_STR "[a", MCKEY_NOACTION},
    {KEY_M_SHIFT | KEY_DOWN, ESC_STR "[b", MCKEY_NOACTION},
    {KEY_M_SHIFT | KEY_RIGHT, ESC_STR "[c", MCKEY_NOACTION},
    {KEY_M_SHIFT | KEY_LEFT, ESC_STR "[d", MCKEY_NOACTION},
    {KEY_M_CTRL | KEY_UP, ESC_STR "Oa", MCKEY_NOACTION},
    {KEY_M_CTRL | KEY_DOWN, ESC_STR "Ob", MCKEY_NOACTION},
    {KEY_M_CTRL | KEY_RIGHT, ESC_STR "Oc", MCKEY_NOACTION},
    {KEY_M_CTRL | KEY_LEFT, ESC_STR "Od", MCKEY_NOACTION},
    {KEY_M_CTRL | KEY_PPAGE, ESC_STR "[5^", MCKEY_NOACTION},
    {KEY_M_CTRL | KEY_NPAGE, ESC_STR "[6^", MCKEY_NOACTION},
    {KEY_M_CTRL | KEY_HOME, ESC_STR "[7^", MCKEY_NOACTION},
    {KEY_M_CTRL | KEY_END, ESC_STR "[8^", MCKEY_NOACTION},
    {KEY_M_SHIFT | KEY_HOME, ESC_STR "[7$", MCKEY_NOACTION},
    {KEY_M_SHIFT | KEY_END, ESC_STR "[8$", MCKEY_NOACTION},
    {KEY_M_CTRL | KEY_IC, ESC_STR "[2^", MCKEY_NOACTION},
    {KEY_M_CTRL | KEY_DC, ESC_STR "[3^", MCKEY_NOACTION},
    {KEY_M_SHIFT | KEY_DC, ESC_STR "[3$", MCKEY_NOACTION},

    /* konsole keys with modifiers */
    {KEY_M_SHIFT | KEY_HOME, ESC_STR "O2H", MCKEY_NOACTION},
    {KEY_M_SHIFT | KEY_END, ESC_STR "O2F", MCKEY_NOACTION},

    /* gnome-terminal */
    {KEY_M_SHIFT | KEY_UP, ESC_STR "[2A", MCKEY_NOACTION},
    {KEY_M_SHIFT | KEY_DOWN, ESC_STR "[2B", MCKEY_NOACTION},
    {KEY_M_SHIFT | KEY_RIGHT, ESC_STR "[2C", MCKEY_NOACTION},
    {KEY_M_SHIFT | KEY_LEFT, ESC_STR "[2D", MCKEY_NOACTION},
    {KEY_M_CTRL | KEY_UP, ESC_STR "[5A", MCKEY_NOACTION},
    {KEY_M_CTRL | KEY_DOWN, ESC_STR "[5B", MCKEY_NOACTION},
    {KEY_M_CTRL | KEY_RIGHT, ESC_STR "[5C", MCKEY_NOACTION},
    {KEY_M_CTRL | KEY_LEFT, ESC_STR "[5D", MCKEY_NOACTION},
    {KEY_M_SHIFT | KEY_M_CTRL | KEY_UP, ESC_STR "[6A", MCKEY_NOACTION},
    {KEY_M_SHIFT | KEY_M_CTRL | KEY_DOWN, ESC_STR "[6B", MCKEY_NOACTION},
    {KEY_M_SHIFT | KEY_M_CTRL | KEY_RIGHT, ESC_STR "[6C", MCKEY_NOACTION},
    {KEY_M_SHIFT | KEY_M_CTRL | KEY_LEFT, ESC_STR "[6D", MCKEY_NOACTION},

    /* gnome-terminal - application mode */
    {KEY_M_CTRL | KEY_UP, ESC_STR "O5A", MCKEY_NOACTION},
    {KEY_M_CTRL | KEY_DOWN, ESC_STR "O5B", MCKEY_NOACTION},
    {KEY_M_CTRL | KEY_RIGHT, ESC_STR "O5C", MCKEY_NOACTION},
    {KEY_M_CTRL | KEY_LEFT, ESC_STR "O5D", MCKEY_NOACTION},
    {KEY_M_SHIFT | KEY_M_CTRL | KEY_UP, ESC_STR "O6A", MCKEY_NOACTION},
    {KEY_M_SHIFT | KEY_M_CTRL | KEY_DOWN, ESC_STR "O6B", MCKEY_NOACTION},
    {KEY_M_SHIFT | KEY_M_CTRL | KEY_RIGHT, ESC_STR "O6C", MCKEY_NOACTION},
    {KEY_M_SHIFT | KEY_M_CTRL | KEY_LEFT, ESC_STR "O6D", MCKEY_NOACTION},

    /* iTerm */
    {KEY_M_SHIFT | KEY_PPAGE, ESC_STR "[5;2~", MCKEY_NOACTION},
    {KEY_M_SHIFT | KEY_NPAGE, ESC_STR "[6;2~", MCKEY_NOACTION},

    /* putty */
    {KEY_M_SHIFT | KEY_PPAGE, ESC_STR "[[5;53~", MCKEY_NOACTION},
    {KEY_M_SHIFT | KEY_NPAGE, ESC_STR "[[6;53~", MCKEY_NOACTION},

    /* keypad keys */
    {KEY_IC, ESC_STR "Op", MCKEY_NOACTION},
    {KEY_DC, ESC_STR "On", MCKEY_NOACTION},
    {'/', ESC_STR "Oo", MCKEY_NOACTION},
    {'\n', ESC_STR "OM", MCKEY_NOACTION},

    {0, NULL, MCKEY_NOACTION},
};

/* qansi-m terminals have a much more key combinatios,
   which are undefined in termcap/terminfo */
static key_define_t qansi_key_defines[] = {
    /* qansi-m terminal */
    {KEY_M_CTRL | KEY_NPAGE, ESC_STR "[u", MCKEY_NOACTION},     /* Ctrl-PgDown */
    {KEY_M_CTRL | KEY_PPAGE, ESC_STR "[v", MCKEY_NOACTION},     /* Ctrl-PgUp   */
    {KEY_M_CTRL | KEY_HOME, ESC_STR "[h", MCKEY_NOACTION},      /* Ctrl-Home   */
    {KEY_M_CTRL | KEY_END, ESC_STR "[y", MCKEY_NOACTION},       /* Ctrl-End    */
    {KEY_M_CTRL | KEY_IC, ESC_STR "[`", MCKEY_NOACTION},        /* Ctrl-Insert */
    {KEY_M_CTRL | KEY_DC, ESC_STR "[p", MCKEY_NOACTION},        /* Ctrl-Delete */
    {KEY_M_CTRL | KEY_LEFT, ESC_STR "[d", MCKEY_NOACTION},      /* Ctrl-Left   */
    {KEY_M_CTRL | KEY_RIGHT, ESC_STR "[c", MCKEY_NOACTION},     /* Ctrl-Right  */
    {KEY_M_CTRL | KEY_DOWN, ESC_STR "[b", MCKEY_NOACTION},      /* Ctrl-Down   */
    {KEY_M_CTRL | KEY_UP, ESC_STR "[a", MCKEY_NOACTION},        /* Ctrl-Up     */
    {KEY_M_CTRL | KEY_KP_ADD, ESC_STR "[s", MCKEY_NOACTION},    /* Ctrl-Gr-Plus */
    {KEY_M_CTRL | KEY_KP_SUBTRACT, ESC_STR "[t", MCKEY_NOACTION},       /* Ctrl-Gr-Minus */
    {KEY_M_CTRL | '\t', ESC_STR "[z", MCKEY_NOACTION},  /* Ctrl-Tab    */
    {KEY_M_SHIFT | '\t', ESC_STR "[Z", MCKEY_NOACTION}, /* Shift-Tab   */
    {KEY_M_CTRL | KEY_F (1), ESC_STR "[1~", MCKEY_NOACTION},    /* Ctrl-F1    */
    {KEY_M_CTRL | KEY_F (2), ESC_STR "[2~", MCKEY_NOACTION},    /* Ctrl-F2    */
    {KEY_M_CTRL | KEY_F (3), ESC_STR "[3~", MCKEY_NOACTION},    /* Ctrl-F3    */
    {KEY_M_CTRL | KEY_F (4), ESC_STR "[4~", MCKEY_NOACTION},    /* Ctrl-F4    */
    {KEY_M_CTRL | KEY_F (5), ESC_STR "[5~", MCKEY_NOACTION},    /* Ctrl-F5    */
    {KEY_M_CTRL | KEY_F (6), ESC_STR "[6~", MCKEY_NOACTION},    /* Ctrl-F6    */
    {KEY_M_CTRL | KEY_F (7), ESC_STR "[7~", MCKEY_NOACTION},    /* Ctrl-F7    */
    {KEY_M_CTRL | KEY_F (8), ESC_STR "[8~", MCKEY_NOACTION},    /* Ctrl-F8    */
    {KEY_M_CTRL | KEY_F (9), ESC_STR "[9~", MCKEY_NOACTION},    /* Ctrl-F9    */
    {KEY_M_CTRL | KEY_F (10), ESC_STR "[10~", MCKEY_NOACTION},  /* Ctrl-F10  */
    {KEY_M_CTRL | KEY_F (11), ESC_STR "[11~", MCKEY_NOACTION},  /* Ctrl-F11  */
    {KEY_M_CTRL | KEY_F (12), ESC_STR "[12~", MCKEY_NOACTION},  /* Ctrl-F12  */
    {KEY_M_ALT | KEY_F (1), ESC_STR "[17~", MCKEY_NOACTION},    /* Alt-F1    */
    {KEY_M_ALT | KEY_F (2), ESC_STR "[18~", MCKEY_NOACTION},    /* Alt-F2    */
    {KEY_M_ALT | KEY_F (3), ESC_STR "[19~", MCKEY_NOACTION},    /* Alt-F3    */
    {KEY_M_ALT | KEY_F (4), ESC_STR "[20~", MCKEY_NOACTION},    /* Alt-F4    */
    {KEY_M_ALT | KEY_F (5), ESC_STR "[21~", MCKEY_NOACTION},    /* Alt-F5    */
    {KEY_M_ALT | KEY_F (6), ESC_STR "[22~", MCKEY_NOACTION},    /* Alt-F6    */
    {KEY_M_ALT | KEY_F (7), ESC_STR "[23~", MCKEY_NOACTION},    /* Alt-F7    */
    {KEY_M_ALT | KEY_F (8), ESC_STR "[24~", MCKEY_NOACTION},    /* Alt-F8    */
    {KEY_M_ALT | KEY_F (9), ESC_STR "[25~", MCKEY_NOACTION},    /* Alt-F9    */
    {KEY_M_ALT | KEY_F (10), ESC_STR "[26~", MCKEY_NOACTION},   /* Alt-F10   */
    {KEY_M_ALT | KEY_F (11), ESC_STR "[27~", MCKEY_NOACTION},   /* Alt-F11   */
    {KEY_M_ALT | KEY_F (12), ESC_STR "[28~", MCKEY_NOACTION},   /* Alt-F12   */
    {KEY_M_ALT | 'a', ESC_STR "Na", MCKEY_NOACTION},    /* Alt-a     */
    {KEY_M_ALT | 'b', ESC_STR "Nb", MCKEY_NOACTION},    /* Alt-b     */
    {KEY_M_ALT | 'c', ESC_STR "Nc", MCKEY_NOACTION},    /* Alt-c     */
    {KEY_M_ALT | 'd', ESC_STR "Nd", MCKEY_NOACTION},    /* Alt-d     */
    {KEY_M_ALT | 'e', ESC_STR "Ne", MCKEY_NOACTION},    /* Alt-e     */
    {KEY_M_ALT | 'f', ESC_STR "Nf", MCKEY_NOACTION},    /* Alt-f     */
    {KEY_M_ALT | 'g', ESC_STR "Ng", MCKEY_NOACTION},    /* Alt-g     */
    {KEY_M_ALT | 'h', ESC_STR "Nh", MCKEY_NOACTION},    /* Alt-h     */
    {KEY_M_ALT | 'i', ESC_STR "Ni", MCKEY_NOACTION},    /* Alt-i     */
    {KEY_M_ALT | 'j', ESC_STR "Nj", MCKEY_NOACTION},    /* Alt-j     */
    {KEY_M_ALT | 'k', ESC_STR "Nk", MCKEY_NOACTION},    /* Alt-k     */
    {KEY_M_ALT | 'l', ESC_STR "Nl", MCKEY_NOACTION},    /* Alt-l     */
    {KEY_M_ALT | 'm', ESC_STR "Nm", MCKEY_NOACTION},    /* Alt-m     */
    {KEY_M_ALT | 'n', ESC_STR "Nn", MCKEY_NOACTION},    /* Alt-n     */
    {KEY_M_ALT | 'o', ESC_STR "No", MCKEY_NOACTION},    /* Alt-o     */
    {KEY_M_ALT | 'p', ESC_STR "Np", MCKEY_NOACTION},    /* Alt-p     */
    {KEY_M_ALT | 'q', ESC_STR "Nq", MCKEY_NOACTION},    /* Alt-q     */
    {KEY_M_ALT | 'r', ESC_STR "Nr", MCKEY_NOACTION},    /* Alt-r     */
    {KEY_M_ALT | 's', ESC_STR "Ns", MCKEY_NOACTION},    /* Alt-s     */
    {KEY_M_ALT | 't', ESC_STR "Nt", MCKEY_NOACTION},    /* Alt-t     */
    {KEY_M_ALT | 'u', ESC_STR "Nu", MCKEY_NOACTION},    /* Alt-u     */
    {KEY_M_ALT | 'v', ESC_STR "Nv", MCKEY_NOACTION},    /* Alt-v     */
    {KEY_M_ALT | 'w', ESC_STR "Nw", MCKEY_NOACTION},    /* Alt-w     */
    {KEY_M_ALT | 'x', ESC_STR "Nx", MCKEY_NOACTION},    /* Alt-x     */
    {KEY_M_ALT | 'y', ESC_STR "Ny", MCKEY_NOACTION},    /* Alt-y     */
    {KEY_M_ALT | 'z', ESC_STR "Nz", MCKEY_NOACTION},    /* Alt-z     */
    {KEY_KP_SUBTRACT, ESC_STR "[S", MCKEY_NOACTION},    /* Gr-Minus  */
    {KEY_KP_ADD, ESC_STR "[T", MCKEY_NOACTION}, /* Gr-Plus   */
    {0, NULL, MCKEY_NOACTION},
};

/* timeout for old_esc_mode in usec */
int old_esc_mode_timeout = 1000000;      /* settable via env */

/* This holds all the key definitions */
static key_def *keys = NULL;

static int input_fd;
static int disabled_channels = 0;       /* Disable channels checking */

static SelectList *select_list = NULL;

static int seq_buffer[SEQ_BUFFER_LEN];
static int *seq_append = NULL;

static int *pending_keys = NULL;

#ifdef __QNXNTO__
ph_dv_f ph_attach;
ph_ov_f ph_input_group;
ph_pqc_f ph_query_cursor;
#endif

#ifdef HAVE_TEXTMODE_X11_SUPPORT
static Display *x11_display;
static Window x11_window;
#endif /* HAVE_TEXTMODE_X11_SUPPORT */

/*** file scope functions **********************************************/

static int
add_selects (fd_set * select_set)
{
    int top_fd = 0;

    if (disabled_channels == 0) {
        SelectList *p;

        for (p = select_list; p != NULL; p = p->next) {
            FD_SET (p->fd, select_set);
            if (p->fd > top_fd)
                top_fd = p->fd;
        }
    }

    return top_fd;
}

static void
check_selects (fd_set * select_set)
{
    if (disabled_channels == 0) {
        gboolean retry;

        do {
            SelectList *p;

            retry = FALSE;
            for (p = select_list; p; p = p->next)
                if (FD_ISSET (p->fd, select_set)) {
                    FD_CLR (p->fd, select_set);
                    (*p->callback) (p->fd, p->info);
                    retry = TRUE;
                    break;
                }
        } while (retry);
    }
}

/* If set timeout is set, then we wait 0.1 seconds, else, we block */
static void
try_channels (int set_timeout)
{
    struct timeval time_out;
    static fd_set select_set;
    struct timeval *timeptr;
    int v;
    int maxfdp;

    while (1) {
        FD_ZERO (&select_set);
        FD_SET (input_fd, &select_set); /* Add stdin */
        maxfdp = max (add_selects (&select_set), input_fd);

        timeptr = NULL;
        if (set_timeout) {
            time_out.tv_sec = 0;
            time_out.tv_usec = 100000;
            timeptr = &time_out;
        }

        v = select (maxfdp + 1, &select_set, NULL, NULL, timeptr);
        if (v > 0) {
            check_selects (&select_set);
            if (FD_ISSET (input_fd, &select_set))
                break;
        }
    }
}

static key_def *
create_sequence (const char *seq, int code, int action)
{
    key_def *base, *p, *attach;

    for (base = attach = NULL; *seq; seq++) {
        p = g_new (key_def, 1);
        if (base == NULL)
            base = p;
        if (attach != NULL)
            attach->child = p;

        p->ch = *seq;
        p->code = code;
        p->child = p->next = NULL;
        if (seq[1] == '\0')
            p->action = action;
        else
            p->action = MCKEY_NOACTION;
        attach = p;
    }
    return base;
}

static void
define_sequences (const key_define_t * kd)
{
    int i;

    for (i = 0; kd[i].code != 0; i++)
        define_sequence (kd[i].code, kd[i].seq, kd[i].action);
}

static void
init_key_x11 (void)
{
#ifdef HAVE_TEXTMODE_X11_SUPPORT
    if (getenv ("DISPLAY") != NULL) {
        x11_display = mc_XOpenDisplay (0);

        if (x11_display != NULL)
            x11_window = DefaultRootWindow (x11_display);
    }
#endif /* HAVE_TEXTMODE_X11_SUPPORT */
}

/* Workaround for System V Curses vt100 bug */
static int
getch_with_delay (void)
{
    int c;

    /* This routine could be used on systems without mouse support,
       so we need to do the select check :-( */
    while (1) {
        if (pending_keys == NULL)
            try_channels (0);

        /* Try to get a character */
        c = get_key_code (0);
        if (c != -1)
            break;
        /* Failed -> wait 0.1 secs and try again */
        try_channels (1);
    }
    /* Success -> return the character */
    return c;
}

static void
xmouse_get_event (Gpm_Event * ev)
{
    int btn;
    static struct timeval tv1 = { 0, 0 };       /* Force first click as single */
    static struct timeval tv2;
    static int clicks = 0;
    static int last_btn = 0;

    /* Decode Xterm mouse information to a GPM style event */

    /* Variable btn has following meaning: */
    /* 0 = btn1 dn, 1 = btn2 dn, 2 = btn3 dn, 3 = btn up */
    btn = tty_lowlevel_getch () - 32;

    /* There seems to be no way of knowing which button was released */
    /* So we assume all the buttons were released */

    if (btn == 3) {
        if (last_btn != 0) {
            if ((last_btn & (GPM_B_UP | GPM_B_DOWN)) != 0) {
                /* FIXME: DIRTY HACK */
                /* don't generate GPM_UP after mouse wheel */
                /* need for menu event handling */
                ev->type = 0;
                tv1.tv_sec = 0;
                tv1.tv_usec = 0;
            } else {
                ev->type = GPM_UP | (GPM_SINGLE << clicks);
                GET_TIME (tv1);
            }
            ev->buttons = 0;
            last_btn = 0;
            clicks = 0;
        } else {
            /* Bogus event, maybe mouse wheel */
            ev->type = 0;
        }
    } else {
        if (btn >= 32 && btn <= 34) {
            btn -= 32;
            ev->type = GPM_DRAG;
        } else
            ev->type = GPM_DOWN;

        GET_TIME (tv2);
        if (tv1.tv_sec && (DIF_TIME (tv1, tv2) < double_click_speed)) {
            clicks++;
            clicks %= 3;
        } else
            clicks = 0;

        switch (btn) {
        case 0:
            ev->buttons = GPM_B_LEFT;
            break;
        case 1:
            ev->buttons = GPM_B_MIDDLE;
            break;
        case 2:
            ev->buttons = GPM_B_RIGHT;
            break;
        case 64:
            ev->buttons = GPM_B_UP;
            clicks = 0;
            break;
        case 65:
            ev->buttons = GPM_B_DOWN;
            clicks = 0;
            break;
        default:
            /* Nothing */
            ev->type = 0;
            ev->buttons = 0;
            break;
        }
        last_btn = ev->buttons;
    }
    /* Coordinates are 33-based */
    /* Transform them to 1-based */
    ev->x = tty_lowlevel_getch () - 32;
    ev->y = tty_lowlevel_getch () - 32;
}

/*
 * Get modifier state (shift, alt, ctrl) for the last key pressed.
 * We are assuming that the state didn't change since the key press.
 * This is only correct if get_modifier() is called very fast after
 * the input was received, so that the user didn't release the
 * modifier keys yet.
 */
static int
get_modifier (void)
{
    int result = 0;
#ifdef __QNXNTO__
    int mod_status, shift_ext_status;
    static int in_photon = 0;
    static int ph_ig = 0;
    PhCursorInfo_t cursor_info;
#endif /* __QNXNTO__ */

#ifdef HAVE_TEXTMODE_X11_SUPPORT
    if (x11_window != 0) {
        Window root, child;
        int root_x, root_y;
        int win_x, win_y;
        unsigned int mask;

        mc_XQueryPointer (x11_display, x11_window, &root, &child, &root_x,
                          &root_y, &win_x, &win_y, &mask);

        if (mask & ShiftMask)
            result |= KEY_M_SHIFT;
        if (mask & ControlMask)
            result |= KEY_M_CTRL;
        return result;
    }
#endif /* HAVE_TEXTMODE_X11_SUPPORT */
#ifdef __QNXNTO__

    if (in_photon == 0) {
        /* First time here, let's load Photon library and attach
           to Photon */
        in_photon = -1;
        if (getenv ("PHOTON2_PATH") != NULL) {
            /* QNX 6.x has no support for RTLD_LAZY */
            void *ph_handle = dlopen ("/usr/lib/libph.so", RTLD_NOW);
            if (ph_handle != NULL) {
                ph_attach = (ph_dv_f) dlsym (ph_handle, "PhAttach");
                ph_input_group = (ph_ov_f) dlsym (ph_handle, "PhInputGroup");
                ph_query_cursor = (ph_pqc_f) dlsym (ph_handle, "PhQueryCursor");
                if ((ph_attach != NULL) && (ph_input_group != NULL)
                    && (ph_query_cursor != NULL)) {
                    if ((*ph_attach) (0, 0)) {  /* Attached */
                        ph_ig = (*ph_input_group) (0);
                        in_photon = 1;
                    }
                }
            }
        }
    }
    /* We do not have Photon running. Assume we are in text
       console or xterm */
    if (in_photon == -1) {
        if (devctl (fileno (stdin), DCMD_CHR_LINESTATUS, &mod_status, sizeof (int), NULL) == -1)
            return 0;
        shift_ext_status = mod_status & 0xffffff00UL;
        mod_status &= 0x7f;
        if (mod_status & _LINESTATUS_CON_ALT)
            result |= KEY_M_ALT;
        if (mod_status & _LINESTATUS_CON_CTRL)
            result |= KEY_M_CTRL;
        if ((mod_status & _LINESTATUS_CON_SHIFT)
            || (shift_ext_status & 0x00000800UL))
            result |= KEY_M_SHIFT;
    } else {
        (*ph_query_cursor) (ph_ig, &cursor_info);
        if (cursor_info.key_mods & 0x04)
            result |= KEY_M_ALT;
        if (cursor_info.key_mods & 0x02)
            result |= KEY_M_CTRL;
        if (cursor_info.key_mods & 0x01)
            result |= KEY_M_SHIFT;
    }
#endif /* __QNXNTO__ */

#if defined __linux__ || (defined __CYGWIN__ && defined TIOCLINUX)
    {
        unsigned char modifiers = 6;

        if (ioctl (0, TIOCLINUX, &modifiers) < 0)
            return 0;

        /* Translate Linux modifiers into mc modifiers */
        if (modifiers & SHIFT_PRESSED)
            result |= KEY_M_SHIFT;
        if (modifiers & (ALTL_PRESSED | ALTR_PRESSED))
            result |= KEY_M_ALT;
        if (modifiers & CONTROL_PRESSED)
            result |= KEY_M_CTRL;
    }
#endif /* !__linux__ */
    return result;
}

static gboolean
push_char (int c)
{
    gboolean ret = FALSE;

    if (seq_append == NULL)
        seq_append = seq_buffer;

    if (seq_append != &(seq_buffer[SEQ_BUFFER_LEN - 2])) {
        *(seq_append++) = c;
        *seq_append = 0;
        ret = TRUE;
    }

    return ret;
}

/* Apply corrections for the keycode generated in get_key_code() */
static int
correct_key_code (int code)
{
    unsigned int c = code & ~KEY_M_MASK;        /* code without modifier */
    unsigned int mod = code & KEY_M_MASK;       /* modifier */
#ifdef __QNXNTO__
    unsigned int qmod;          /* bunch of the QNX console
                                   modifiers needs unchanged */
#endif /* __QNXNTO__ */

    /*
     * Add key modifiers directly from X11 or OS.
     * Ordinary characters only get modifiers from sequences.
     */
    if (c < 32 || c >= 256) {
        mod |= get_modifier ();
    }

    /* This is needed if the newline is reported as carriage return */
    if (c == '\r')
        c = '\n';

    /* This is reported to be useful on AIX */
    if (c == KEY_SCANCEL)
        c = '\t';

    /* Convert Shift+Tab and Ctrl+Tab to Back Tab */
    if ((c == '\t') && (mod & (KEY_M_SHIFT | KEY_M_CTRL))) {
        c = KEY_BTAB;
        mod = 0;
    }

    /* F0 is the same as F10 for out purposes */
    if (c == KEY_F (0))
        c = KEY_F (10);

    /*
     * We are not interested if Ctrl was pressed when entering control
     * characters, so assume that it was.  When checking for such keys,
     * XCTRL macro should be used.  In some cases, we are interested,
     * e.g. to distinguish Ctrl-Enter from Enter.
     */
    if (c < 32 && c != ESC_CHAR && c != '\t' && c != '\n') {
        mod |= KEY_M_CTRL;
    }
#ifdef __QNXNTO__
    qmod = get_modifier ();

    if ((c == 127) && (mod == 0)) {     /* Add Ctrl/Alt/Shift-BackSpace */
        mod |= get_modifier ();
        c = KEY_BACKSPACE;
    }

    if ((c == '0') && (mod == 0)) {     /* Add Shift-Insert on key pad */
        if ((qmod & KEY_M_SHIFT) == KEY_M_SHIFT) {
            mod = KEY_M_SHIFT;
            c = KEY_IC;
        }
    }

    if ((c == '.') && (mod == 0)) {     /* Add Shift-Del on key pad */
        if ((qmod & KEY_M_SHIFT) == KEY_M_SHIFT) {
            mod = KEY_M_SHIFT;
            c = KEY_DC;
        }
    }
#endif /* __QNXNTO__ */

    /* Unrecognized 0177 is delete (preserve Ctrl) */
    if (c == 0177) {
        c = KEY_BACKSPACE;
    }

    /* Unrecognized Ctrl-d is delete */
    if (c == (31 & 'd')) {
        c = KEY_DC;
        mod &= ~KEY_M_CTRL;
    }

    /* Unrecognized Ctrl-h is backspace */
    if (c == (31 & 'h')) {
        c = KEY_BACKSPACE;
        mod &= ~KEY_M_CTRL;
    }

    /* Shift+BackSpace is backspace */
    if (c == KEY_BACKSPACE && (mod & KEY_M_SHIFT)) {
        mod &= ~KEY_M_SHIFT;
    }

    /* Convert Shift+Fn to F(n+10) */
    if (c >= KEY_F (1) && c <= KEY_F (10) && (mod & KEY_M_SHIFT)) {
        c += 10;
    }

    /* Remove Shift information from function keys */
    if (c >= KEY_F (1) && c <= KEY_F (20)) {
        mod &= ~KEY_M_SHIFT;
    }

    if (!alternate_plus_minus)
        switch (c) {
        case KEY_KP_ADD:
            c = '+';
            break;
        case KEY_KP_SUBTRACT:
            c = '-';
            break;
        case KEY_KP_MULTIPLY:
            c = '*';
            break;
        }

    return (mod | c);
}

static int
xgetch_second (void)
{
    fd_set Read_FD_Set;
    int c;
    struct timeval time_out;

    time_out.tv_sec = old_esc_mode_timeout / 1000000;
    time_out.tv_usec = old_esc_mode_timeout % 1000000;
    tty_nodelay (TRUE);
    FD_ZERO (&Read_FD_Set);
    FD_SET (input_fd, &Read_FD_Set);
    select (input_fd + 1, &Read_FD_Set, NULL, NULL, &time_out);
    c = tty_lowlevel_getch ();
    tty_nodelay (FALSE);
    return c;
}

static void
learn_store_key (char *buffer, char **p, int c)
{
    if (*p - buffer > 253)
        return;
    if (c == ESC_CHAR) {
        *(*p)++ = '\\';
        *(*p)++ = 'e';
    } else if (c < ' ') {
        *(*p)++ = '^';
        *(*p)++ = c + 'a' - 1;
    } else if (c == '^') {
        *(*p)++ = '^';
        *(*p)++ = '^';
    } else
        *(*p)++ = (char) c;
}

static void
k_dispose (key_def * k)
{
    if (k != NULL) {
        k_dispose (k->child);
        k_dispose (k->next);
        g_free (k);
    }
}

static void
s_dispose (SelectList * sel)
{
    if (sel != NULL) {
        s_dispose (sel->next);
        g_free (sel);
    }
}

/*** public functions **************************************************/

/* This has to be called before init_slang or whatever routine
   calls any define_sequence */
void
init_key (void)
{
    const char *term = getenv ("TERM");

    /* This has to be the first define_sequence */
    /* So, we can assume that the first keys member has ESC */
    define_sequences (mc_default_keys);

    /* Terminfo on irix does not have some keys */
    if (xterm_flag
        || (term != NULL
            && (strncmp (term, "iris-ansi", 9) == 0
                || strncmp (term, "xterm", 5) == 0
                || strncmp (term, "rxvt", 4) == 0 || strcmp (term, "screen") == 0)))
        define_sequences (xterm_key_defines);

    /* load some additional keys (e.g. direct Alt-? support) */
    load_xtra_key_defines ();

#ifdef __QNX__
    if ((term != NULL) && (strncmp (term, "qnx", 3) == 0)) {
        /* Modify the default value of use_8th_bit_as_meta: we would
         * like to provide a working mc for a newbie who knows nothing
         * about [Options|Display bits|Full 8 bits input]...
         *
         * Don't use 'meta'-bit, when we are dealing with a
         * 'qnx*'-type terminal: clear the default value!
         * These terminal types use 0xFF as an escape character,
         * so use_8th_bit_as_meta==1 must not be enabled!
         *
         * [mc-4.1.21+,slint.c/getch(): the DEC_8BIT_HACK stuff
         * is not used now (doesn't even depend on use_8th_bit_as_meta
         * as in mc-3.1.2)...GREAT!...no additional code is required!]
         */
        use_8th_bit_as_meta = 0;
    }
#endif /* __QNX__ */

    init_key_x11 ();

    /* Load the qansi-m key definitions
       if we are running under the qansi-m terminal */
    if (term != NULL && (strncmp (term, "qansi-m", 7) == 0))
        define_sequences (qansi_key_defines);
}

/* This has to be called after SLang_init_tty/slint_init */
void
init_key_input_fd (void)
{
#ifdef HAVE_SLANG
    input_fd = SLang_TT_Read_FD;
#endif
}

void
done_key (void)
{
    k_dispose (keys);
    s_dispose (select_list);

#ifdef HAVE_TEXTMODE_X11_SUPPORT
    if (x11_display)
        mc_XCloseDisplay (x11_display);
#endif
}

void
add_select_channel (int fd, select_fn callback, void *info)
{
    SelectList *new;

    new = g_new (SelectList, 1);
    new->fd = fd;
    new->callback = callback;
    new->info = info;
    new->next = select_list;
    select_list = new;
}

void
delete_select_channel (int fd)
{
    SelectList *p = select_list;
    SelectList *p_prev = NULL;
    SelectList *p_next;

    while (p != NULL)
        if (p->fd == fd) {
            p_next = p->next;

            if (p_prev != NULL)
                p_prev->next = p_next;
            else
                select_list = p_next;

            g_free (p);
            p = p_next;
        } else {
            p_prev = p;
            p = p->next;
        }
}

void
channels_up (void)
{
    if (disabled_channels == 0)
        fputs ("Error: channels_up called with disabled_channels = 0\n", stderr);
    disabled_channels--;
}

void
channels_down (void)
{
    disabled_channels++;
}

static const size_t key_name_conv_tab_size = sizeof (key_name_conv_tab) /
						sizeof (key_name_conv_tab[0]) - 1;
static const key_code_name_t *key_name_conv_tab_sorted[sizeof (key_name_conv_tab) /
						sizeof (key_name_conv_tab[0]) - 1];

static int
key_code_name_comparator (const void *p1, const void *p2)
{
    const key_code_name_t *n1 = *(const key_code_name_t **) p1;
    const key_code_name_t *n2 = *(const key_code_name_t **) p2;

    return str_casecmp (n1->name, n2->name);
}

static inline void
sort_key_name_conv_tab (void)
{
    static gboolean has_been_sorted = FALSE;

    if (!has_been_sorted) {
	size_t i;
	for (i = 0; i < key_name_conv_tab_size; i++)
	    key_name_conv_tab_sorted[i] = &key_name_conv_tab[i];

	qsort (key_name_conv_tab_sorted,
		key_name_conv_tab_size, sizeof (key_name_conv_tab_sorted[0]),
		&key_code_name_comparator);
	has_been_sorted = TRUE;
    }
}

static int
lookup_keyname (const char *name, int *idx)
{
    if (name[0] != '\0') {
	const key_code_name_t key = { 0, name, NULL, NULL };
	const key_code_name_t *keyp = &key;
	key_code_name_t **res;

	if (name[1] == '\0') {
	    *idx = -1;
	    return (int) name[0];
	}

	sort_key_name_conv_tab ();

	res = bsearch (&keyp, key_name_conv_tab_sorted,
			    key_name_conv_tab_size,
			    sizeof (key_name_conv_tab_sorted[0]),
			    key_code_name_comparator);

	if (res != NULL) {
	    *idx = (int) (res - (key_code_name_t **) key_name_conv_tab_sorted);
	    return (*res)->code;
	}
    }

    *idx = -1;
    return 0;
}

/* Return the code associated with the symbolic name keyname */
long
lookup_key (const char *name, char **label)
{
    char **lc_keys, **p;
    int k = -1;
    int key = 0;
    int lc_index = -1;

    int use_meta = -1;
    int use_ctrl = -1;
    int use_shift = -1;

    if (name == NULL)
	return 0;

    name = g_strstrip (g_strdup (name));
    p = lc_keys = g_strsplit_set (name, "-+ ", -1);
    g_free ((char *) name);

    while ((p != NULL) && (*p != NULL)) {
	if ((*p)[0] != '\0') {
	    int idx;

	    key = lookup_keyname (g_strstrip (*p), &idx);

	    if (key == KEY_M_ALT)
		use_meta = idx;
	    else if (key == KEY_M_CTRL)
		use_ctrl = idx;
	    else if (key == KEY_M_SHIFT)
		use_shift = idx;
	    else {
		k = key;
		lc_index = idx;
		break;
	    }
	}

	p++;
    }

    g_strfreev (lc_keys);

    /* output */
    if (k <= 0)
	return 0;


    if (label != NULL) {
	GString *s;

	s = g_string_new ("");

	if (use_meta != -1) {
	    g_string_append (s, key_name_conv_tab_sorted[use_meta]->shortcut);
	    g_string_append_c (s, '-');
	}
	if (use_ctrl != -1) {
	    g_string_append (s, key_name_conv_tab_sorted[use_ctrl]->shortcut);
	    g_string_append_c (s, '-');
	}
	if (use_shift != -1) {
	    if (k < 127)
		g_string_append_c (s, (gchar) g_ascii_toupper ((gchar) k));
	    else {
		g_string_append (s, key_name_conv_tab_sorted[use_shift]->shortcut);
		g_string_append_c (s, '-');
		g_string_append (s, key_name_conv_tab_sorted[lc_index]->shortcut);
	    }
	} else if (k < 128) {
	    if ((k >= 'A') || (lc_index < 0)
		|| (key_name_conv_tab_sorted[lc_index]->shortcut == NULL))
		g_string_append_c (s, (gchar) g_ascii_tolower ((gchar) k));
	    else
		g_string_append (s, key_name_conv_tab_sorted[lc_index]->shortcut);
	} else if ((lc_index != -1) && (key_name_conv_tab_sorted[lc_index]->shortcut != NULL))
	    g_string_append (s, key_name_conv_tab_sorted[lc_index]->shortcut);
	else
	    g_string_append_c (s, (gchar) g_ascii_tolower ((gchar) key));

	*label = g_string_free (s, FALSE);
    }

    if (use_shift != -1) {
	if (k < 127 && k > 31 )
	    k = g_ascii_toupper ((gchar) k);
	else
	    k |= KEY_M_SHIFT;
    }

    if (use_ctrl != -1) {
        if (k < 256)
            k = XCTRL (k);
        else
            k |= KEY_M_CTRL;
    }

    if (use_meta != -1)
        k = ALT (k);

    return (long) k;
}

/*
 * Return TRUE on success, FALSE on error.
 * An error happens if SEQ is a beginning of an existing longer sequence.
 */
gboolean
define_sequence (int code, const char *seq, int action)
{
    key_def *base;

    if (strlen (seq) > SEQ_BUFFER_LEN - 1)
        return FALSE;

    for (base = keys; (base != NULL) && (*seq != '\0');)
        if (*seq == base->ch) {
            if (base->child == 0) {
                if (*(seq + 1) != '\0')
                    base->child = create_sequence (seq + 1, code, action);
                else {
                    /* The sequence matches an existing one.  */
                    base->code = code;
                    base->action = action;
                }
                return TRUE;
            }

            base = base->child;
            seq++;
        } else {
            if (base->next)
                base = base->next;
            else {
                base->next = create_sequence (seq, code, action);
                return TRUE;
            }
        }

    if (*seq == '\0') {
        /* Attempt to redefine a sequence with a shorter sequence.  */
        return FALSE;
    }

    keys = create_sequence (seq, code, action);
    return TRUE;
}

/*
 * Check if we are idle, i.e. there are no pending keyboard or mouse
 * events.  Return 1 is idle, 0 is there are pending events.
 */
gboolean
is_idle (void)
{
    int maxfdp;
    fd_set select_set;
    struct timeval time_out;

    FD_ZERO (&select_set);
    FD_SET (input_fd, &select_set);
    maxfdp = input_fd;
#ifdef HAVE_LIBGPM
    if (mouse_enabled && (use_mouse_p == MOUSE_GPM) && (gpm_fd > 0)) {
        FD_SET (gpm_fd, &select_set);
        maxfdp = max (maxfdp, gpm_fd);
    }
#endif
    time_out.tv_sec = 0;
    time_out.tv_usec = 0;
    return (select (maxfdp + 1, &select_set, 0, 0, &time_out) <= 0);
}

int
get_key_code (int no_delay)
{
    int c;
    static key_def *this = NULL, *parent;
    static struct timeval esctime = { -1, -1 };
    static int lastnodelay = -1;

    if (no_delay != lastnodelay) {
        this = NULL;
        lastnodelay = no_delay;
    }

  pend_send:
    if (pending_keys != NULL) {
        int d = *pending_keys++;
      check_pend:
        if (*pending_keys == 0) {
            pending_keys = NULL;
            seq_append = NULL;
        }
        if ((d == ESC_CHAR) && (pending_keys != NULL)) {
            d = ALT (*pending_keys++);
            goto check_pend;
        }
        if ((d > 127 && d < 256) && use_8th_bit_as_meta)
            d = ALT (d & 0x7f);
        this = NULL;
        return correct_key_code (d);
    }

  nodelay_try_again:
    if (no_delay)
        tty_nodelay (TRUE);

    c = tty_lowlevel_getch ();
#if (defined(USE_NCURSES) || defined(USE_NCURSESW)) && defined(KEY_RESIZE)
    if (c == KEY_RESIZE)
        goto nodelay_try_again;
#endif
    if (no_delay) {
        tty_nodelay (FALSE);
        if (c == -1) {
            if (this != NULL && parent != NULL && parent->action == MCKEY_ESCAPE && old_esc_mode) {
                struct timeval current, time_out;

                if (esctime.tv_sec == -1)
                    return -1;
                GET_TIME (current);
                time_out.tv_sec = old_esc_mode_timeout / 1000000 + esctime.tv_sec;
                time_out.tv_usec = old_esc_mode_timeout % 1000000 + esctime.tv_usec;
                if (time_out.tv_usec > 1000000) {
                    time_out.tv_usec -= 1000000;
                    time_out.tv_sec++;
                }
                if (current.tv_sec < time_out.tv_sec)
                    return -1;
                if (current.tv_sec == time_out.tv_sec && current.tv_usec < time_out.tv_usec)
                    return -1;
                this = NULL;
                pending_keys = seq_append = NULL;
                return ESC_CHAR;
            }
            return -1;
        }
    } else if (c == -1) {
        /* Maybe we got an incomplete match.
           This we do only in delay mode, since otherwise
           tty_lowlevel_getch can return -1 at any time. */
        if (seq_append != NULL) {
            pending_keys = seq_buffer;
            goto pend_send;
        }
        this = NULL;
        return -1;
    }

    /* Search the key on the root */
    if (!no_delay || this == NULL) {
        this = keys;
        parent = NULL;

        if ((c > 127 && c < 256) && use_8th_bit_as_meta) {
            c &= 0x7f;

            /* The first sequence defined starts with esc */
            parent = keys;
            this = keys->child;
        }
    }
    while (this != NULL) {
        if (c == this->ch) {
            if (this->child) {
                if (!push_char (c)) {
                    pending_keys = seq_buffer;
                    goto pend_send;
                }
                parent = this;
                this = this->child;
                if (parent->action == MCKEY_ESCAPE && old_esc_mode) {
                    if (no_delay) {
                        GET_TIME (esctime);
                        if (this == NULL) {
                            /* Shouldn't happen */
                            fputs ("Internal error\n", stderr);
                            exit (EXIT_FAILURE);
                        }
                        goto nodelay_try_again;
                    }
                    esctime.tv_sec = -1;
                    c = xgetch_second ();
                    if (c == -1) {
                        pending_keys = seq_append = NULL;
                        this = NULL;
                        return ESC_CHAR;
                    }
                } else {
                    if (no_delay)
                        goto nodelay_try_again;
                    c = tty_lowlevel_getch ();
                }
            } else {
                /* We got a complete match, return and reset search */
                int code;

                pending_keys = seq_append = NULL;
                code = this->code;
                this = NULL;
                return correct_key_code (code);
            }
        } else {
            if (this->next != NULL)
                this = this->next;
            else {
                if ((parent != NULL) && (parent->action == MCKEY_ESCAPE)) {
                    /* Convert escape-digits to F-keys */
                    if (g_ascii_isdigit (c))
                        c = KEY_F (c - '0');
                    else if (c == ' ')
                        c = ESC_CHAR;
                    else
                        c = ALT (c);

                    pending_keys = seq_append = NULL;
                    this = NULL;
                    return correct_key_code (c);
                }
                /* Did not find a match or {c} was changed in the if above,
                   so we have to return everything we had skipped
                 */
                push_char (c);
                pending_keys = seq_buffer;
                goto pend_send;
            }
        }
    }
    this = NULL;
    return correct_key_code (c);
}

/* Returns a character read from stdin with appropriate interpretation */
/* Also takes care of generated mouse events */
/* Returns EV_MOUSE if it is a mouse event */
/* Returns EV_NONE  if non-blocking or interrupt set and nothing was done */
int
tty_get_event (struct Gpm_Event *event, gboolean redo_event, gboolean block)
{
    int c;
    static int flag = 0;        /* Return value from select */
#ifdef HAVE_LIBGPM
    static struct Gpm_Event ev; /* Mouse event */
#endif
    struct timeval time_out;
    struct timeval *time_addr = NULL;
    static int dirty = 3;

    if ((dirty == 3) || is_idle ()) {
        mc_refresh ();
        dirty = 1;
    } else
        dirty++;

    vfs_timeout_handler ();

    /* Ok, we use (event->x < 0) to signal that the event does not contain
       a suitable position for the mouse, so we can't use show_mouse_pointer
       on it.
     */
    if (event->x > 0) {
        show_mouse_pointer (event->x, event->y);
        if (!redo_event)
            event->x = -1;
    }

    /* Repeat if using mouse */
    while (pending_keys == NULL) {
        int maxfdp;
        fd_set select_set;

        FD_ZERO (&select_set);
        FD_SET (input_fd, &select_set);
        maxfdp = max (add_selects (&select_set), input_fd);

#ifdef HAVE_LIBGPM
        if (mouse_enabled && (use_mouse_p == MOUSE_GPM)) {
            if (gpm_fd < 0) {
                /* Connection to gpm broken, possibly gpm has died */
                mouse_enabled = FALSE;
                use_mouse_p = MOUSE_NONE;
                break;
            }

            FD_SET (gpm_fd, &select_set);
            maxfdp = max (maxfdp, gpm_fd);
        }
#endif

        if (redo_event) {
            time_out.tv_usec = mou_auto_repeat * 1000;
            time_out.tv_sec = 0;

            time_addr = &time_out;
        } else {
            int seconds;

            seconds = vfs_timeouts ();
            time_addr = NULL;

            if (seconds != 0) {
                /* the timeout could be improved and actually be
                 * the number of seconds until the next vfs entry
                 * timeouts in the stamp list.
                 */

                time_out.tv_sec = seconds;
                time_out.tv_usec = 0;
                time_addr = &time_out;
            }
        }

        if (!block || winch_flag) {
            time_addr = &time_out;
            time_out.tv_sec = 0;
            time_out.tv_usec = 0;
        }

        tty_enable_interrupt_key ();
        flag = select (maxfdp + 1, &select_set, NULL, NULL, time_addr);
        tty_disable_interrupt_key ();

        /* select timed out: it could be for any of the following reasons:
         * redo_event -> it was because of the MOU_REPEAT handler
         * !block     -> we did not block in the select call
         * else       -> 10 second timeout to check the vfs status.
         */
        if (flag == 0) {
            if (redo_event)
                return EV_MOUSE;
            if (!block || winch_flag)
                return EV_NONE;
            vfs_timeout_handler ();
        }
        if (flag == -1 && errno == EINTR)
            return EV_NONE;

        check_selects (&select_set);

        if (FD_ISSET (input_fd, &select_set))
            break;
#ifdef HAVE_LIBGPM
        if (mouse_enabled && use_mouse_p == MOUSE_GPM
            && gpm_fd > 0 && FD_ISSET (gpm_fd, &select_set)) {
            Gpm_GetEvent (&ev);
            Gpm_FitEvent (&ev);
            *event = ev;
            return EV_MOUSE;
        }
#endif /* !HAVE_LIBGPM */
    }

#ifndef HAVE_SLANG
    flag = is_wintouched (stdscr);
    untouchwin (stdscr);
#endif /* !HAVE_SLANG */
    c = block ? getch_with_delay () : get_key_code (1);

#ifndef HAVE_SLANG
    if (flag > 0)
        tty_touch_screen ();
#endif /* !HAVE_SLANG */

    if (mouse_enabled && (c == MCKEY_MOUSE
#ifdef KEY_MOUSE
                          || c == KEY_MOUSE
#endif /* KEY_MOUSE */
        )) {
        /* Mouse event */
        xmouse_get_event (event);
        return (event->type != 0) ? EV_MOUSE : EV_NONE;
    }

    return c;
}

/* Returns a key press, mouse events are discarded */
int
tty_getch (void)
{
    Gpm_Event ev;
    int key;

    ev.x = -1;
    while ((key = tty_get_event (&ev, FALSE, TRUE)) == EV_NONE);
    return key;
}

char *
learn_key (void)
{
/* LEARN_TIMEOUT in usec */
#define LEARN_TIMEOUT 200000

    fd_set Read_FD_Set;
    struct timeval endtime;
    struct timeval time_out;
    int c;
    char buffer[256];
    char *p = buffer;

    tty_keypad (FALSE);         /* disable intepreting keys by ncurses */
    c = tty_lowlevel_getch ();
    while (c == -1)
        c = tty_lowlevel_getch ();      /* Sanity check, should be unnecessary */
    learn_store_key (buffer, &p, c);
    GET_TIME (endtime);
    endtime.tv_usec += LEARN_TIMEOUT;
    if (endtime.tv_usec > 1000000) {
        endtime.tv_usec -= 1000000;
        endtime.tv_sec++;
    }
    tty_nodelay (TRUE);
    for (;;) {
        while ((c = tty_lowlevel_getch ()) == -1) {
            GET_TIME (time_out);
            time_out.tv_usec = endtime.tv_usec - time_out.tv_usec;
            if (time_out.tv_usec < 0)
                time_out.tv_sec++;
            time_out.tv_sec = endtime.tv_sec - time_out.tv_sec;
            if (time_out.tv_sec >= 0 && time_out.tv_usec > 0) {
                FD_ZERO (&Read_FD_Set);
                FD_SET (input_fd, &Read_FD_Set);
                select (input_fd + 1, &Read_FD_Set, NULL, NULL, &time_out);
            } else
                break;
        }
        if (c == -1)
            break;
        learn_store_key (buffer, &p, c);
    }
    tty_keypad (TRUE);
    tty_nodelay (FALSE);
    *p = '\0';
    return g_strdup (buffer);
#undef LEARN_TIMEOUT
}

/* xterm and linux console only: set keypad to numeric or application
   mode. Only in application keypad mode it's possible to distinguish
   the '+' key and the '+' on the keypad ('*' and '-' ditto)*/
void
numeric_keypad_mode (void)
{
    if (console_flag || xterm_flag) {
        fputs ("\033>", stdout);
        fflush (stdout);
    }
}

void
application_keypad_mode (void)
{
    if (console_flag || xterm_flag) {
        fputs ("\033=", stdout);
        fflush (stdout);
    }
}