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Revision 1.55, Sun Jul 26 12:58:44 2009 UTC (14 years, 10 months ago) by nicm
Branch: MAIN
Changes since 1.54: +34 -26 lines

Make all messages sent between the client and server fixed size.

This is the first of two changes to make the protocol more resilient and less
sensitive to other changes in the code, particularly with commands. The client
now packs argv into a buffer and sends it to the server for parsing, rather
than doing it itself and sending the parsed command data.

As a side-effect this also removes a lot of now-unused command marshalling
code.

Mixing a server without this change and a client with or vice versa will cause
tmux to hang or crash, please ensure that tmux is entirely killed before
upgrading.

/* $OpenBSD: tmux.h,v 1.55 2009/07/26 12:58:44 nicm Exp $ */

/*
 * 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.
 */

#ifndef TMUX_H
#define TMUX_H

#define PROTOCOL_VERSION -15

#include <sys/param.h>
#include <sys/time.h>
#include <sys/queue.h>
#include <sys/tree.h>

#include <bitstring.h>
#include <getopt.h>
#include <limits.h>
#include <poll.h>
#include <signal.h>
#include <stdarg.h>
#include <stdint.h>
#include <stdio.h>
#include <termios.h>

#include "array.h"

extern char    *__progname;

/* Default configuration files. */
#define DEFAULT_CFG ".tmux.conf"
#define SYSTEM_CFG "/etc/tmux.conf"

/* Default prompt history length. */
#define PROMPT_HISTORY 100

/* 
 * Minimum layout cell size, NOT including separator line. The scroll region
 * cannot be one line in height so this must be at least two.
 */
#define PANE_MINIMUM 2

/* Automatic name refresh interval, in milliseconds. */
#define NAME_INTERVAL 500

/* Escape timer period, in milliseconds. */
#define ESCAPE_PERIOD 250

/* Maximum poll timeout (when attached). */
#define POLL_TIMEOUT 50

/*
 * Maximum sizes of strings in message data. Don't forget to bump
 * PROTOCOL_VERSION if any of these change!
 */
#define COMMAND_LENGTH 2048	/* packed argv size */
#define TERMINAL_LENGTH 128	/* length of TERM environment variable */
#define PRINT_LENGTH 512	/* printed error/message size */

/* Fatal errors. */
#define fatal(msg) log_fatal("%s: %s", __func__, msg);
#define fatalx(msg) log_fatalx("%s: %s", __func__, msg);

/* Definition to shut gcc up about unused arguments. */
#define unused __attribute__ ((unused))

/* Attribute to make gcc check printf-like arguments. */
#define printflike1 __attribute__ ((format (printf, 1, 2)))
#define printflike2 __attribute__ ((format (printf, 2, 3)))
#define printflike3 __attribute__ ((format (printf, 3, 4)))
#define printflike4 __attribute__ ((format (printf, 4, 5)))
#define printflike5 __attribute__ ((format (printf, 5, 6)))

/* Number of items in array. */
#ifndef nitems
#define nitems(_a) (sizeof((_a)) / sizeof((_a)[0]))
#endif

/* Buffer macros. */
#define BUFFER_USED(b) ((b)->size)
#define BUFFER_FREE(b) ((b)->space - (b)->off - (b)->size)
#define BUFFER_IN(b) ((b)->base + (b)->off + (b)->size)
#define BUFFER_OUT(b) ((b)->base + (b)->off)

/* Buffer structure. */
struct buffer {
	u_char	*base;		/* buffer start */
	size_t	 space;		/* total size of buffer */

	size_t	 size;		/* size of data in buffer */
	size_t	 off;		/* offset of data in buffer */
};

/* Bell option values. */
#define BELL_NONE 0
#define BELL_ANY 1
#define BELL_CURRENT 2

/* Key codes. ncurses defines KEY_*. Grrr. */
#define KEYC_NONE 0xfff
/* 0x1000 is base for special keys */
#define KEYC_ESCAPE 0x2000
#define KEYC_CTRL 0x4000
#define KEYC_SHIFT 0x8000
#define KEYC_PREFIX 0x10000

enum key_code {
	/* Mouse key. */
	KEYC_MOUSE = 0x1000,

	/* Function keys. */
	KEYC_F1,
	KEYC_F2,
	KEYC_F3,
	KEYC_F4,
	KEYC_F5,
	KEYC_F6,
	KEYC_F7,
	KEYC_F8,
	KEYC_F9,
	KEYC_F10,
	KEYC_F11,
	KEYC_F12,
	KEYC_F13,
	KEYC_F14,
	KEYC_F15,
	KEYC_F16,
	KEYC_F17,
	KEYC_F18,
	KEYC_F19,
	KEYC_F20,
	KEYC_IC,
	KEYC_DC,
	KEYC_HOME,
	KEYC_END,
	KEYC_NPAGE,
	KEYC_PPAGE,
	KEYC_BTAB,

	/* Arrow keys. */
	KEYC_UP,
	KEYC_DOWN,
	KEYC_LEFT,
	KEYC_RIGHT,

	/* Numeric keypad. Numbered from top-left, KPY_X. */
	KEYC_KP0_1,
	KEYC_KP0_2,
	KEYC_KP0_3,
	KEYC_KP1_0,
	KEYC_KP1_1,
	KEYC_KP1_2,
	KEYC_KP1_3,
	KEYC_KP2_0,
	KEYC_KP2_1,
	KEYC_KP2_2,
	KEYC_KP3_0,
	KEYC_KP3_1,
	KEYC_KP3_2,
	KEYC_KP3_3,
	KEYC_KP4_0,
	KEYC_KP4_2,
};

/* Termcap codes. */
enum tty_code_code {
	TTYC_AX = 0,
	TTYC_ACSC,	/* acs_chars, ac */
	TTYC_BEL,	/* bell, bl */
	TTYC_BLINK,	/* enter_blink_mode, mb */
	TTYC_BOLD,	/* enter_bold_mode, md */
	TTYC_CIVIS,	/* cursor_invisible, vi */
	TTYC_CLEAR,	/* clear_screen, cl */
	TTYC_CNORM,	/* cursor_normal, ve */
	TTYC_COLORS,	/* max_colors, Co */
	TTYC_CSR,	/* change_scroll_region, cs */
	TTYC_CUD,	/* parm_down_cursor, DO */
	TTYC_CUD1,	/* cursor_down, do */
	TTYC_CUP,	/* cursor_address, cm */
	TTYC_DCH,	/* parm_dch, DC */
	TTYC_DCH1,	/* delete_character, dc */
	TTYC_DIM,	/* enter_dim_mode, mh */
	TTYC_DL,	/* parm_delete_line, DL */
	TTYC_DL1,	/* delete_line, dl */
	TTYC_EL,	/* clr_eol, ce */
	TTYC_EL1,	/* clr_bol, cb */
	TTYC_ENACS,	/* ena_acs, eA */
	TTYC_ICH,	/* parm_ich, IC */
	TTYC_ICH1,	/* insert_character, ic */
	TTYC_IL,	/* parm_insert_line, IL */
	TTYC_IL1,	/* insert_line, il */
	TTYC_INVIS,	/* enter_secure_mode, mk */
	TTYC_IS1,	/* init_1string, i1 */
	TTYC_IS2,	/* init_2string, i2 */
	TTYC_IS3,	/* init_3string, i3 */
	TTYC_KCBT,	/* key_btab, kB */
	TTYC_KCUB1,	/* key_left, kl */
	TTYC_KCUD1,	/* key_down, kd */
	TTYC_KCUF1,	/* key_right, kr */
	TTYC_KCUU1,	/* key_up, ku */
	TTYC_KDCH1,	/* key_dc, kD */
	TTYC_KEND,	/* key_end, ke */
	TTYC_KF1,	/* key_f1, k1 */
	TTYC_KF10,	/* key_f10, k; */
	TTYC_KF11,	/* key_f11, F1 */
	TTYC_KF12,	/* key_f12, F2 */
	TTYC_KF13,	/* key_f13, F3 */
	TTYC_KF14,	/* key_f14, F4 */
	TTYC_KF15,	/* key_f15, F5 */
	TTYC_KF16,	/* key_f16, F6 */
	TTYC_KF17,	/* key_f17, F7 */
	TTYC_KF18,	/* key_f18, F8 */
	TTYC_KF19,	/* key_f19, F9 */
	TTYC_KF20,	/* key_f20, F10 */
	TTYC_KF2,	/* key_f2, k2 */
	TTYC_KF3,	/* key_f3, k3 */
	TTYC_KF4,	/* key_f4, k4 */
	TTYC_KF5,	/* key_f5, k5 */
	TTYC_KF6,	/* key_f6, k6 */
	TTYC_KF7,	/* key_f7, k7 */
	TTYC_KF8,	/* key_f8, k8 */
	TTYC_KF9,	/* key_f9, k9 */
	TTYC_KHOME,	/* key_home, kh */
	TTYC_KICH1,	/* key_ic, kI */
	TTYC_KMOUS,	/* key_mouse, Km */
	TTYC_KNP,	/* key_npage, kN */
	TTYC_KPP,	/* key_ppage, kP */
	TTYC_OP,	/* orig_pair, op */
	TTYC_REV,	/* enter_reverse_mode, mr */
	TTYC_RI,	/* scroll_reverse, sr */
	TTYC_RMACS,	/* exit_alt_charset_mode */
	TTYC_RMCUP,	/* exit_ca_mode, te */
	TTYC_RMIR,	/* exit_insert_mode, ei */
	TTYC_RMKX,	/* keypad_local, ke */
	TTYC_SETAB,	/* set_a_background, AB */
	TTYC_SETAF,	/* set_a_foreground, AF */
	TTYC_SGR0,	/* exit_attribute_mode, me */
	TTYC_SMACS,	/* enter_alt_charset_mode, as */
	TTYC_SMCUP,	/* enter_ca_mode, ti */
	TTYC_SMIR,	/* enter_insert_mode, im */
	TTYC_SMKX,	/* keypad_xmit, ks */
	TTYC_SMSO,	/* enter_standout_mode, so */
	TTYC_SMUL,	/* enter_underline_mode, us */
	TTYC_XENL,	/* eat_newline_glitch, xn */
};
#define NTTYCODE (TTYC_XENL + 1)

/* Termcap types. */
enum tty_code_type {
	TTYCODE_NONE = 0,
	TTYCODE_STRING,
	TTYCODE_NUMBER,
	TTYCODE_FLAG,
};

/* Termcap code. */
struct tty_code {
	enum tty_code_type	type;
	union {
		char 	       *string;
		int	 	number;
		int	 	flag;
	} value;
};

/* Entry in terminal code table. */
struct tty_term_code_entry {
	enum tty_code_code	code;
	enum tty_code_type	type;
	const char	       *name;
};

/* Message codes. */
enum hdrtype {
	MSG_COMMAND,
	MSG_DETACH,
	MSG_ERROR,
	MSG_EXIT,
	MSG_EXITED,
	MSG_EXITING,
	MSG_IDENTIFY,
	MSG_PRINT,
	MSG_READY,
	MSG_RESIZE,
	MSG_SHUTDOWN,
	MSG_SUSPEND,
	MSG_UNLOCK,
	MSG_WAKEUP,
};

/*
 * Message header and data. 
 *
 * Don't forget to bump PROTOCOL_VERSION if any of these change!
 *
 * Changing sizeof (struct hdr) or sizeof (struct msg_identify_data) will make
 * the tmux client hang even if the protocol version is bumped.
 */
struct hdr {
	enum hdrtype	type;
	size_t		size;
};

struct msg_print_data {
	char		msg[PRINT_LENGTH];
};

struct msg_command_data {
	pid_t		pid;			/* pid from $TMUX or -1 */
	u_int		idx;			/* index from $TMUX */

	int		argc;
	char		argv[COMMAND_LENGTH];
};

struct msg_identify_data {
	char		tty[TTY_NAME_MAX];
	int	        version;

	char		cwd[MAXPATHLEN];

	char		term[TERMINAL_LENGTH];

#define IDENTIFY_UTF8 0x1
#define IDENTIFY_256COLOURS 0x2
#define IDENTIFY_88COLOURS 0x4
#define IDENTIFY_HASDEFAULTS 0x8
	int		flags;

	u_int		sx;
	u_int		sy;
};

struct msg_resize_data {
	u_int		sx;
	u_int		sy;
};

struct msg_unlock_data {
	char	       	pass[PASS_MAX];
};

/* Editing keys. */
enum mode_key_cmd {
	MODEKEYCMD_BACKSPACE = 0x1000,
	MODEKEYCMD_BACKTOINDENTATION,
	MODEKEYCMD_CHOOSE,
	MODEKEYCMD_CLEARSELECTION,
	MODEKEYCMD_COMPLETE,
	MODEKEYCMD_COPYSELECTION,
	MODEKEYCMD_DELETE,
	MODEKEYCMD_DOWN,
	MODEKEYCMD_ENDOFLINE,
	MODEKEYCMD_LEFT,
	MODEKEYCMD_NEXTPAGE,
	MODEKEYCMD_NEXTWORD,
	MODEKEYCMD_NONE,
	MODEKEYCMD_OTHERKEY,
	MODEKEYCMD_PASTE,
	MODEKEYCMD_PREVIOUSPAGE,
	MODEKEYCMD_PREVIOUSWORD,
	MODEKEYCMD_QUIT,
	MODEKEYCMD_RIGHT,
	MODEKEYCMD_STARTOFLINE,
	MODEKEYCMD_STARTSELECTION,
	MODEKEYCMD_UP,
};

struct mode_key_data {
	int			 type;

	int			 flags;
#define MODEKEY_EDITMODE 0x1
#define MODEKEY_CANEDIT 0x2
#define MODEKEY_CHOOSEMODE 0x4
};

#define MODEKEY_EMACS 0
#define MODEKEY_VI 1

/* Modes. */
#define MODE_CURSOR 0x1
#define MODE_INSERT 0x2
#define MODE_KCURSOR 0x4
#define MODE_KKEYPAD 0x8
#define MODE_MOUSE 0x10

/* Grid output. */
#if defined(DEBUG) && \
    ((defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L) || \
     (defined(__GNUC__) && __GNUC__ >= 3))
#define GRID_DEBUG(gd, fmt, ...) log_debug2("%s: (sx=%u, sy=%u, hsize=%u) " \
    fmt, __func__, (gd)->sx, (gd)->sy, (gd)->hsize, ## __VA_ARGS__)
#else
#define GRID_DEBUG(...)
#endif

/* Grid attributes. */
#define GRID_ATTR_BRIGHT 0x1
#define GRID_ATTR_DIM 0x2
#define GRID_ATTR_UNDERSCORE 0x4
#define GRID_ATTR_BLINK 0x8
#define GRID_ATTR_REVERSE 0x10
#define GRID_ATTR_HIDDEN 0x20
#define GRID_ATTR_ITALICS 0x40
#define GRID_ATTR_CHARSET 0x80	/* alternative character set */

/* Grid flags. */
#define GRID_FLAG_FG256 0x1
#define GRID_FLAG_BG256 0x2
#define GRID_FLAG_PADDING 0x4
#define GRID_FLAG_UTF8 0x8

/* Grid cell data. */
struct grid_cell {
	u_char	attr;
	u_char	flags;
	u_char	fg;
	u_char	bg;
	u_char	data;
} __packed;

/* Grid cell UTF-8 data. Used instead of data in grid_cell for UTF-8 cells. */
#define UTF8_SIZE 8
struct grid_utf8 {
	u_char	width;
	u_char	data[UTF8_SIZE];
} __packed;

/* Entire grid of cells. */
struct grid {
	int	flags;
#define GRID_HISTORY 0x1	/* scroll lines into history */

	u_int	sx;
	u_int	sy;

	u_int	hsize;
	u_int	hlimit;

	u_int  *size;
	struct grid_cell **data;

	u_int  *usize;
 	struct grid_utf8 **udata;
};

/* Option data structures. */
struct options_entry {
	char		*name;

	enum {
		OPTIONS_STRING,
		OPTIONS_NUMBER,
		OPTIONS_KEY,
	} type;
	union {
		char	*string;
		long long number;
		int	 key;
	} value;

	SPLAY_ENTRY(options_entry) entry;
};

struct options {
	SPLAY_HEAD(options_tree, options_entry) tree;
	struct options	*parent;
};

/* Screen selection. */
struct screen_sel {
	int		 flag;

	u_int		 sx;
	u_int		 sy;

	u_int		 ex;
	u_int		 ey;

	struct grid_cell cell;
};

/* Virtual screen. */
struct screen {
	char		*title;

	struct grid     *grid;		/* grid data */

	u_int		 cx;		/* cursor x */
	u_int		 cy;		/* cursor y */

	u_int		 rupper;	/* scroll region top */
	u_int		 rlower;	/* scroll region bottom */

	int		 mode;

	bitstr_t      	*tabs;

	struct screen_sel sel;
};

/* Screen write context. */
struct screen_write_ctx {
	struct window_pane *wp;
	struct screen	*s;
};

/* Screen size. */
#define screen_size_x(s) ((s)->grid->sx)
#define screen_size_y(s) ((s)->grid->sy)
#define screen_hsize(s) ((s)->grid->hsize)
#define screen_hlimit(s) ((s)->grid->hlimit)

/* Input parser sequence argument. */
struct input_arg {
	u_char		 data[64];
	size_t		 used;
};

/* Input parser context. */
struct input_ctx {
	struct window_pane *wp;
	struct screen_write_ctx ctx;

	u_char		*buf;
	size_t		 len;
	size_t		 off;

	struct grid_cell cell;


	struct grid_cell saved_cell;
	u_int		 saved_cx;
	u_int		 saved_cy;

#define MAXSTRINGLEN	1024
	u_char		*string_buf;
	size_t		 string_len;
	int		 string_type;
#define STRING_SYSTEM 0
#define STRING_APPLICATION 1
#define STRING_NAME 2

	u_char		 utf8_buf[4];
	u_int		 utf8_len;
	u_int		 utf8_off;

	u_char		 intermediate;
	void 		*(*state)(u_char, struct input_ctx *);

	u_char		 private;
	ARRAY_DECL(, struct input_arg) args;
};

/*
 * Window mode. Windows can be in several modes and this is used to call the
 * right function to handle input and output.
 */
struct client;
struct window;
struct window_mode {
	struct screen *(*init)(struct window_pane *);
	void	(*free)(struct window_pane *);
	void	(*resize)(struct window_pane *, u_int, u_int);
	void	(*key)(struct window_pane *, struct client *, int);
	void	(*mouse)(struct window_pane *,
	    	    struct client *, u_char, u_char, u_char);
	void	(*timer)(struct window_pane *);
};

/* Child window structure. */
struct window_pane {
	struct window	*window;
	struct layout_cell *layout_cell;

	u_int		 sx;
	u_int		 sy;

	u_int		 xoff;
	u_int		 yoff;

	int		 flags;
#define PANE_REDRAW 0x1

	char		*cmd;
	char		*cwd;

	pid_t		 pid;
	int		 fd;
	char		 tty[TTY_NAME_MAX];
	struct buffer	*in;
	struct buffer	*out;

	struct input_ctx ictx;

	struct screen	*screen;
	struct screen	 base;

	/* Saved in alternative screen mode. */
 	u_int		 saved_cx;
 	u_int		 saved_cy;
	struct grid	*saved_grid;

	const struct window_mode *mode;
	void		*modedata;

	TAILQ_ENTRY(window_pane) entry;
};
TAILQ_HEAD(window_panes, window_pane);

/* Window structure. */
struct window {
	char		*name;
	struct timeval	 name_timer;

	struct window_pane *active;
	struct window_panes panes;

	u_int		 layout;
	struct layout_cell *layout_root;

	u_int		 sx;
	u_int		 sy;

	int		 flags;
#define WINDOW_BELL 0x1
#define WINDOW_HIDDEN 0x2
#define WINDOW_ACTIVITY 0x4
#define WINDOW_CONTENT 0x8
#define WINDOW_REDRAW 0x10

	struct options	 options;

	u_int		 references;
};
ARRAY_DECL(windows, struct window *);

/* Entry on local window list. */
struct winlink {
	int		 idx;
	struct window	*window;

	RB_ENTRY(winlink) entry;
	SLIST_ENTRY(winlink) sentry;
};
RB_HEAD(winlinks, winlink);
SLIST_HEAD(winlink_stack, winlink);

/* Layout direction. */
enum layout_type {
	LAYOUT_LEFTRIGHT,
	LAYOUT_TOPBOTTOM,
	LAYOUT_WINDOWPANE
};

/* Layout cells queue. */
TAILQ_HEAD(layout_cells, layout_cell);

/* Layout cell. */
struct layout_cell {
	enum layout_type type;

	struct layout_cell *parent;

	u_int		 sx;
	u_int		 sy;

	u_int		 xoff;
	u_int		 yoff;

	struct window_pane *wp;
	struct layout_cells cells;

	TAILQ_ENTRY(layout_cell) entry;
};

/* Paste buffer. */
struct paste_buffer {
     	char		*data;
	struct timeval	 tv;
};
ARRAY_DECL(paste_stack, struct paste_buffer *);

/* Client session. */
struct session_alert {
	struct winlink	*wl;
	int		 type;

	SLIST_ENTRY(session_alert) entry;
};

struct session {
	char		*name;
	struct timeval	 tv;

	u_int		 sx;
	u_int		 sy;

	struct winlink	*curw;
	struct winlink_stack lastw;
	struct winlinks	 windows;

	struct options	 options;

	struct paste_stack buffers;

	SLIST_HEAD(, session_alert) alerts;

#define SESSION_UNATTACHED 0x1	/* not attached to any clients */
	int		 flags;
};
ARRAY_DECL(sessions, struct session *);

/* TTY information. */
struct tty_key {
	int	 	 key;
	char		*string;

	int		 flags;
#define TTYKEY_CTRL 0x1
#define TTYKEY_RAW 0x2

	RB_ENTRY(tty_key) entry;
};

struct tty_term {
	char		*name;
	u_int		 references;

	struct tty_code	 codes[NTTYCODE];

#define TERM_HASDEFAULTS 0x1
#define TERM_256COLOURS 0x2
#define TERM_88COLOURS 0x4
#define TERM_EARLYWRAP 0x8
	int		 flags;

	SLIST_ENTRY(tty_term) entry;
};
SLIST_HEAD(tty_terms, tty_term);

struct tty {
	char		*path;

        u_int            sx;
        u_int            sy;

	u_int		 cx;
	u_int		 cy;

	int		 mode;

	u_int		 rlower;
	u_int		 rupper;

	char		*termname;
	struct tty_term	*term;

	int		 fd;
	struct buffer	*in;
	struct buffer	*out;

	int		 log_fd;

	struct termios   tio;

	struct grid_cell cell;

	u_char		 acs[UCHAR_MAX + 1];

#define TTY_NOCURSOR 0x1
#define TTY_FREEZE 0x2
#define TTY_ESCAPE 0x4
#define TTY_UTF8 0x8
	int    		 flags;

	int		 term_flags;

	struct timeval	 key_timer;

	size_t		 ksize;	/* maximum key size */
	RB_HEAD(tty_keys, tty_key) ktree;
};

/* TTY command context and function pointer. */
struct tty_ctx {
	struct window_pane *wp;

	const struct grid_cell *cell;
	const struct grid_utf8 *utf8;

	u_int		 num;
	void		*ptr; 

	/* 
	 * Cursor and region position before the screen was updated - this is
	 * where the command should be applied; the values in the screen have
	 * already been updated.
	 */
	u_int		 ocx;
	u_int		 ocy;

	u_int		 orupper;
	u_int		 orlower;
};

/* Client connection. */
struct client {
	int		 fd;
	struct buffer	*in;
	struct buffer	*out;

	char		*title;
	char		*cwd;

	struct tty 	 tty;
	struct timeval	 status_timer;
	struct timeval	 repeat_timer;

	struct screen	 status;

#define CLIENT_TERMINAL 0x1
#define CLIENT_PREFIX 0x2
#define CLIENT_MOUSE 0x4
#define CLIENT_REDRAW 0x8
#define CLIENT_STATUS 0x10
#define CLIENT_REPEAT 0x20	/* allow command to repeat within repeat time */
#define CLIENT_SUSPENDED 0x40
	int		 flags;

	char		*message_string;
	struct timeval	 message_timer;

	char		*prompt_string;
	char		*prompt_buffer;
	size_t		 prompt_index;
	int		 (*prompt_callbackfn)(void *, const char *);
	void		 (*prompt_freefn)(void *);
	void		*prompt_data;

#define PROMPT_HIDDEN 0x1
#define PROMPT_SINGLE 0x2
	int		 prompt_flags;

	u_int		 prompt_hindex;
	ARRAY_DECL(, char *) prompt_hdata;

	struct mode_key_data prompt_mdata;

	struct session	*session;
};
ARRAY_DECL(clients, struct client *);

/* Client context. */
struct client_ctx {
	int		 srv_fd;
	struct buffer	*srv_in;
	struct buffer	*srv_out;

	enum {
		CCTX_DETACH,
		CCTX_EXIT,
		CCTX_DIED,
		CCTX_SHUTDOWN,
	} exittype;
	const char	*errstr;
};

/* Key/command line command. */
struct cmd_ctx {
	/*
	 * curclient is the client where this command was executed if inside
	 * tmux. This is NULL if the command came from the command-line.
	 *
	 * cmdclient is the client which sent the MSG_COMMAND to the server, if
	 * any. This is NULL unless the command came from the command-line.
	 *
	 * cmdclient and curclient may both be NULL if the command is in the
	 * configuration file.
	 */
	struct client  *curclient;
	struct client  *cmdclient;

	struct session *cursession;

	struct msg_command_data	*msgdata;

	void		(*print)(struct cmd_ctx *, const char *, ...);
	void		(*info)(struct cmd_ctx *, const char *, ...);
	void		(*error)(struct cmd_ctx *, const char *, ...);
};

struct cmd {
	const struct cmd_entry *entry;
	void	       	*data;

	TAILQ_ENTRY(cmd) qentry;
};
TAILQ_HEAD(cmd_list, cmd);

struct cmd_entry {
	const char	*name;
	const char	*alias;
	const char	*usage;

#define CMD_STARTSERVER 0x1
#define CMD_CANTNEST 0x2
#define CMD_ARG1 0x4
#define CMD_ARG01 0x8
	int		 flags;

#define CMD_CHFLAG(flag) \
	((flag) >= 'a' && (flag) <= 'z' ? 1ULL << ((flag) - 'a') :	\
	(flag) >= 'A' && (flag) <= 'Z' ? 1ULL << (26 + (flag) - 'A') : 0)
	uint64_t	 chflags;

	void		 (*init)(struct cmd *, int);
	int		 (*parse)(struct cmd *, int, char **, char **);
	int		 (*exec)(struct cmd *, struct cmd_ctx *);
	void		 (*free)(struct cmd *);
	size_t 		 (*print)(struct cmd *, char *, size_t);
};

/* Generic command data. */
struct cmd_target_data {
	uint64_t chflags;
	char	*target;
	char	*arg;
};

struct cmd_srcdst_data {
	uint64_t chflags;
	char	*src;
	char	*dst;
	char	*arg;
};

struct cmd_buffer_data {
	uint64_t chflags;
	char	*target;
	int	 buffer;
	char	*arg;
};

struct cmd_option_data {
	uint64_t chflags;
	char	*target;
	char	*option;
	char	*value;
};

struct cmd_pane_data {
	uint64_t chflags;
	char	*target;
	char	*arg;
	int	 pane;
};

/* Key binding. */
struct key_binding {
	int		 key;
	struct cmd_list	*cmdlist;
	int		 can_repeat;

	SPLAY_ENTRY(key_binding) entry;
};
SPLAY_HEAD(key_bindings, key_binding);

/* Set/display option data. */
struct set_option_entry {
	const char	*name;
	enum {
		SET_OPTION_STRING,
		SET_OPTION_NUMBER,
		SET_OPTION_KEY,
		SET_OPTION_COLOUR,
		SET_OPTION_ATTRIBUTES,
		SET_OPTION_FLAG,
		SET_OPTION_CHOICE
	} type;

	u_int		 minimum;
	u_int		 maximum;

	const char     **choices;
};
extern const struct set_option_entry set_option_table[];
extern const struct set_option_entry set_window_option_table[];

/* tmux.c */
extern volatile sig_atomic_t sigwinch;
extern volatile sig_atomic_t sigterm;
extern volatile sig_atomic_t sigcont;
extern volatile sig_atomic_t sigchld;
extern volatile sig_atomic_t sigusr1;
extern volatile sig_atomic_t sigusr2;
extern struct options global_s_options;
extern struct options global_w_options;
extern char	*cfg_file;
extern int	 server_locked;
extern u_int	 password_failures;
extern char	*server_password;
extern time_t	 server_activity;
extern int	 debug_level;
extern int	 be_quiet;
extern time_t	 start_time;
extern char 	*socket_path;
void		 logfile(const char *);
void		 siginit(void);
void		 sigreset(void);
void		 sighandler(int);

/* cfg.c */
int		 load_cfg(const char *, char **x);

/* mode-key.c */
void		 mode_key_init(struct mode_key_data *, int, int);
void		 mode_key_free(struct mode_key_data *);
enum mode_key_cmd mode_key_lookup(struct mode_key_data *, int);

/* options.c */
int	options_cmp(struct options_entry *, struct options_entry *);
SPLAY_PROTOTYPE(options_tree, options_entry, entry, options_cmp);
void	options_init(struct options *, struct options *);
void	options_free(struct options *);
struct options_entry *options_find1(struct options *, const char *);
struct options_entry *options_find(struct options *, const char *);
void	options_remove(struct options *, const char *);
void printflike3 options_set_string(
    	    struct options *, const char *, const char *, ...);
char   *options_get_string(struct options *, const char *);
void	options_set_number(struct options *, const char *, long long);
long long options_get_number(struct options *, const char *);

/* tty.c */
u_char	tty_get_acs(struct tty *, u_char);
void	tty_reset(struct tty *);
void	tty_region(struct tty *, u_int, u_int, u_int);
void	tty_cursor(struct tty *, u_int, u_int, u_int, u_int);
void	tty_putcode(struct tty *, enum tty_code_code);
void	tty_putcode1(struct tty *, enum tty_code_code, int);
void	tty_putcode2(struct tty *, enum tty_code_code, int, int);
void	tty_puts(struct tty *, const char *);
void	tty_putc(struct tty *, u_char);
void	tty_pututf8(struct tty *, const struct grid_utf8 *);
void	tty_init(struct tty *, char *, char *);
void	tty_start_tty(struct tty *);
void	tty_stop_tty(struct tty *);
void	tty_detect_utf8(struct tty *);
void	tty_set_title(struct tty *, const char *);
void	tty_update_mode(struct tty *, int);
void	tty_draw_line(struct tty *, struct screen *, u_int, u_int, u_int);
int	tty_open(struct tty *, char **);
void	tty_close(struct tty *, int);
void	tty_free(struct tty *, int);
void	tty_write(void (*)(struct tty *, struct tty_ctx *), struct tty_ctx *);
void	tty_cmd_alignmenttest(struct tty *, struct tty_ctx *);
void	tty_cmd_cell(struct tty *, struct tty_ctx *);
void	tty_cmd_clearendofline(struct tty *, struct tty_ctx *);
void	tty_cmd_clearendofscreen(struct tty *, struct tty_ctx *);
void	tty_cmd_clearline(struct tty *, struct tty_ctx *);
void	tty_cmd_clearscreen(struct tty *, struct tty_ctx *);
void	tty_cmd_clearstartofline(struct tty *, struct tty_ctx *);
void	tty_cmd_clearstartofscreen(struct tty *, struct tty_ctx *);
void	tty_cmd_deletecharacter(struct tty *, struct tty_ctx *);
void	tty_cmd_deleteline(struct tty *, struct tty_ctx *);
void	tty_cmd_insertcharacter(struct tty *, struct tty_ctx *);
void	tty_cmd_insertline(struct tty *, struct tty_ctx *);
void	tty_cmd_linefeed(struct tty *, struct tty_ctx *);
void	tty_cmd_utf8character(struct tty *, struct tty_ctx *);
void	tty_cmd_reverseindex(struct tty *, struct tty_ctx *);

/* tty-term.c */
extern struct tty_terms tty_terms;
extern struct tty_term_code_entry tty_term_codes[NTTYCODE];
struct tty_term *tty_term_find(char *, int, char **);
void 		 tty_term_free(struct tty_term *);
int		 tty_term_has(struct tty_term *, enum tty_code_code);
const char	*tty_term_string(struct tty_term *, enum tty_code_code);
const char	*tty_term_string1(struct tty_term *, enum tty_code_code, int);
const char	*tty_term_string2(
    		     struct tty_term *, enum tty_code_code, int, int);
int		 tty_term_number(struct tty_term *, enum tty_code_code);
int		 tty_term_flag(struct tty_term *, enum tty_code_code);

/* tty-keys.c */
int	tty_keys_cmp(struct tty_key *, struct tty_key *);
RB_PROTOTYPE(tty_keys, tty_key, entry, tty_keys_cmp);
void	tty_keys_init(struct tty *);
void	tty_keys_free(struct tty *);
int	tty_keys_next(struct tty *, int *, u_char *);

/* options-cmd.c */
void	set_option_string(struct cmd_ctx *,
	    struct options *, const struct set_option_entry *, char *);
void	set_option_number(struct cmd_ctx *,
    	    struct options *, const struct set_option_entry *, char *);
void	set_option_key(struct cmd_ctx *,
    	    struct options *, const struct set_option_entry *, char *);
void	set_option_colour(struct cmd_ctx *,
    	    struct options *, const struct set_option_entry *, char *);
void	set_option_attributes(struct cmd_ctx *,
    	    struct options *, const struct set_option_entry *, char *);
void	set_option_flag(struct cmd_ctx *,
    	    struct options *, const struct set_option_entry *, char *);
void	set_option_choice(struct cmd_ctx *,
    	    struct options *, const struct set_option_entry *, char *);

/* paste.c */
void		 paste_init_stack(struct paste_stack *);
void		 paste_free_stack(struct paste_stack *);
struct paste_buffer *paste_walk_stack(struct paste_stack *, uint *);
struct paste_buffer *paste_get_top(struct paste_stack *);
struct paste_buffer *paste_get_index(struct paste_stack *, u_int);
int	     	 paste_free_top(struct paste_stack *);
int		 paste_free_index(struct paste_stack *, u_int);
void		 paste_add(struct paste_stack *, char *, u_int);
int		 paste_replace(struct paste_stack *, u_int, char *);

/* clock.c */
void		 clock_draw(struct screen_write_ctx *, u_int, int);

/* cmd.c */
int		 cmd_pack_argv(int, char **, char *, size_t);
int		 cmd_unpack_argv(char *, size_t, int, char ***);
void		 cmd_free_argv(int, char **);
struct cmd	*cmd_parse(int, char **, char **);
int		 cmd_exec(struct cmd *, struct cmd_ctx *);
void		 cmd_free(struct cmd *);
size_t		 cmd_print(struct cmd *, char *, size_t);
struct session	*cmd_current_session(struct cmd_ctx *);
struct client	*cmd_find_client(struct cmd_ctx *, const char *);
struct session	*cmd_find_session(struct cmd_ctx *, const char *);
struct winlink	*cmd_find_window(
		     struct cmd_ctx *, const char *, struct session **);
int		 cmd_find_index(
		     struct cmd_ctx *, const char *, struct session **);
extern const struct cmd_entry *cmd_table[];
extern const struct cmd_entry cmd_attach_session_entry;
extern const struct cmd_entry cmd_bind_key_entry;
extern const struct cmd_entry cmd_break_pane_entry;
extern const struct cmd_entry cmd_choose_session_entry;
extern const struct cmd_entry cmd_choose_window_entry;
extern const struct cmd_entry cmd_clear_history_entry;
extern const struct cmd_entry cmd_clock_mode_entry;
extern const struct cmd_entry cmd_command_prompt_entry;
extern const struct cmd_entry cmd_confirm_before_entry;
extern const struct cmd_entry cmd_copy_buffer_entry;
extern const struct cmd_entry cmd_copy_mode_entry;
extern const struct cmd_entry cmd_delete_buffer_entry;
extern const struct cmd_entry cmd_detach_client_entry;
extern const struct cmd_entry cmd_display_message_entry;
extern const struct cmd_entry cmd_down_pane_entry;
extern const struct cmd_entry cmd_find_window_entry;
extern const struct cmd_entry cmd_has_session_entry;
extern const struct cmd_entry cmd_if_shell_entry;
extern const struct cmd_entry cmd_kill_pane_entry;
extern const struct cmd_entry cmd_kill_server_entry;
extern const struct cmd_entry cmd_kill_session_entry;
extern const struct cmd_entry cmd_kill_window_entry;
extern const struct cmd_entry cmd_last_window_entry;
extern const struct cmd_entry cmd_link_window_entry;
extern const struct cmd_entry cmd_list_buffers_entry;
extern const struct cmd_entry cmd_list_clients_entry;
extern const struct cmd_entry cmd_list_commands_entry;
extern const struct cmd_entry cmd_list_keys_entry;
extern const struct cmd_entry cmd_list_sessions_entry;
extern const struct cmd_entry cmd_list_windows_entry;
extern const struct cmd_entry cmd_load_buffer_entry;
extern const struct cmd_entry cmd_lock_server_entry;
extern const struct cmd_entry cmd_move_window_entry;
extern const struct cmd_entry cmd_new_session_entry;
extern const struct cmd_entry cmd_new_window_entry;
extern const struct cmd_entry cmd_next_layout_entry;
extern const struct cmd_entry cmd_next_window_entry;
extern const struct cmd_entry cmd_paste_buffer_entry;
extern const struct cmd_entry cmd_previous_layout_entry;
extern const struct cmd_entry cmd_previous_window_entry;
extern const struct cmd_entry cmd_refresh_client_entry;
extern const struct cmd_entry cmd_rename_session_entry;
extern const struct cmd_entry cmd_rename_window_entry;
extern const struct cmd_entry cmd_resize_pane_entry;
extern const struct cmd_entry cmd_respawn_window_entry;
extern const struct cmd_entry cmd_rotate_window_entry;
extern const struct cmd_entry cmd_save_buffer_entry;
extern const struct cmd_entry cmd_scroll_mode_entry;
extern const struct cmd_entry cmd_select_layout_entry;
extern const struct cmd_entry cmd_select_pane_entry;
extern const struct cmd_entry cmd_select_prompt_entry;
extern const struct cmd_entry cmd_select_window_entry;
extern const struct cmd_entry cmd_send_keys_entry;
extern const struct cmd_entry cmd_send_prefix_entry;
extern const struct cmd_entry cmd_server_info_entry;
extern const struct cmd_entry cmd_set_buffer_entry;
extern const struct cmd_entry cmd_set_option_entry;
extern const struct cmd_entry cmd_set_password_entry;
extern const struct cmd_entry cmd_set_window_option_entry;
extern const struct cmd_entry cmd_show_buffer_entry;
extern const struct cmd_entry cmd_show_options_entry;
extern const struct cmd_entry cmd_show_window_options_entry;
extern const struct cmd_entry cmd_source_file_entry;
extern const struct cmd_entry cmd_split_window_entry;
extern const struct cmd_entry cmd_start_server_entry;
extern const struct cmd_entry cmd_suspend_client_entry;
extern const struct cmd_entry cmd_swap_pane_entry;
extern const struct cmd_entry cmd_swap_window_entry;
extern const struct cmd_entry cmd_switch_client_entry;
extern const struct cmd_entry cmd_unbind_key_entry;
extern const struct cmd_entry cmd_unlink_window_entry;
extern const struct cmd_entry cmd_up_pane_entry;

/* cmd-list.c */
struct cmd_list	*cmd_list_parse(int, char **, char **);
int		 cmd_list_exec(struct cmd_list *, struct cmd_ctx *);
void		 cmd_list_free(struct cmd_list *);
size_t		 cmd_list_print(struct cmd_list *, char *, size_t);

/* cmd-string.c */
int	cmd_string_parse(const char *, struct cmd_list **, char **);

/* cmd-generic.c */
size_t  cmd_prarg(char *, size_t, const char *, char *);
#define CMD_TARGET_WINDOW_USAGE "[-t target-window]"
#define CMD_TARGET_SESSION_USAGE "[-t target-session]"
#define CMD_TARGET_CLIENT_USAGE "[-t target-client]"
void	cmd_target_init(struct cmd *, int);
int	cmd_target_parse(struct cmd *, int, char **, char **);
void	cmd_target_free(struct cmd *);
size_t	cmd_target_print(struct cmd *, char *, size_t);
#define CMD_SRCDST_WINDOW_USAGE "[-s src-window] [-t dst-window]"
#define CMD_SRCDST_SESSION_USAGE "[-s src-session] [-t dst-session]"
#define CMD_SRCDST_CLIENT_USAGE "[-s src-client] [-t dst-client]"
void	cmd_srcdst_init(struct cmd *, int);
int	cmd_srcdst_parse(struct cmd *, int, char **, char **);
void	cmd_srcdst_free(struct cmd *);
size_t	cmd_srcdst_print(struct cmd *, char *, size_t);
#define CMD_BUFFER_WINDOW_USAGE "[-b buffer-index] [-t target-window]"
#define CMD_BUFFER_SESSION_USAGE "[-b buffer-index] [-t target-session]"
#define CMD_BUFFER_CLIENT_USAGE "[-b buffer-index] [-t target-client]"
void	cmd_buffer_init(struct cmd *, int);
int	cmd_buffer_parse(struct cmd *, int, char **, char **);
void	cmd_buffer_free(struct cmd *);
size_t	cmd_buffer_print(struct cmd *, char *, size_t);
#define CMD_OPTION_WINDOW_USAGE "[-gu] [-t target-window] option [value]"
#define CMD_OPTION_SESSION_USAGE "[-gu] [-t target-session] option [value]"
#define CMD_OPTION_CLIENT_USAGE "[-gu] [-t target-client] option [value]"
void	cmd_option_init(struct cmd *, int);
int	cmd_option_parse(struct cmd *, int, char **, char **);
void	cmd_option_free(struct cmd *);
size_t	cmd_option_print(struct cmd *, char *, size_t);
#define CMD_PANE_WINDOW_USAGE "[-t target-window] [-p pane-index]"
#define CMD_PANE_SESSION_USAGE "[-t target-session] [-p pane-index]"
#define CMD_PANE_CLIENT_USAGE "[-t target-client] [-p pane-index]"
void	cmd_pane_init(struct cmd *, int);
int	cmd_pane_parse(struct cmd *, int, char **, char **);
void	cmd_pane_free(struct cmd *);
size_t	cmd_pane_print(struct cmd *, char *, size_t);

/* client.c */
int	 client_init(char *, struct client_ctx *, int, int);
int	 client_main(struct client_ctx *);

/* client-msg.c */
int	 client_msg_dispatch(struct client_ctx *);

/* client-fn.c */
void	 client_write_server(struct client_ctx *, enum hdrtype, void *, size_t);
void	 client_fill_session(struct msg_command_data *);

/* key-bindings.c */
extern struct key_bindings key_bindings;
int	 key_bindings_cmp(struct key_binding *, struct key_binding *);
SPLAY_PROTOTYPE(key_bindings, key_binding, entry, key_bindings_cmp);
struct key_binding *key_bindings_lookup(int);
void	 key_bindings_add(int, int, struct cmd_list *);
void	 key_bindings_remove(int);
void	 key_bindings_clean(void);
void	 key_bindings_init(void);
void	 key_bindings_free(void);
void	 key_bindings_dispatch(struct key_binding *, struct client *);
void printflike2 key_bindings_error(struct cmd_ctx *, const char *, ...);
void printflike2 key_bindings_print(struct cmd_ctx *, const char *, ...);
void printflike2 key_bindings_info(struct cmd_ctx *, const char *, ...);

/* key-string.c */
int	 key_string_lookup_string(const char *);
const char *key_string_lookup_key(int);

/* server.c */
extern struct clients clients;
int	 server_client_index(struct client *);
int	 server_start(char *);

/* server-msg.c */
int	 server_msg_dispatch(struct client *);

/* server-fn.c */
const char **server_fill_environ(struct session *);
void	 server_write_error(struct client *, const char *);
void	 server_write_client(
             struct client *, enum hdrtype, const void *, size_t);
void	 server_write_session(
             struct session *, enum hdrtype, const void *, size_t);
void	 server_redraw_client(struct client *);
void	 server_status_client(struct client *);
void	 server_redraw_session(struct session *);
void	 server_status_session(struct session *);
void	 server_redraw_window(struct window *);
void	 server_status_window(struct window *);
void	 server_lock(void);
int	 server_unlock(const char *);
void	 server_kill_window(struct window *);

/* status.c */
int	 status_redraw(struct client *);
char	*status_replace(struct session *, const char *, time_t);
void printflike2 status_message_set(struct client *, const char *, ...);
void	 status_message_clear(struct client *);
int	 status_message_redraw(struct client *);
void	 status_prompt_set(struct client *, const char *,
    	     int (*)(void *, const char *), void (*)(void *), void *, int);
void	 status_prompt_clear(struct client *);
int	 status_prompt_redraw(struct client *);
void	 status_prompt_key(struct client *, int);

/* resize.c */
void	 recalculate_sizes(void);

/* input.c */
void	 input_init(struct window_pane *);
void	 input_free(struct window_pane *);
void	 input_parse(struct window_pane *);

/* input-key.c */
void	 input_key(struct window_pane *, int);
void	 input_mouse(struct window_pane *, u_char, u_char, u_char);

/* colour.c */
const char *colour_tostring(u_char);
int	 colour_fromstring(const char *);
u_char	 colour_256to16(u_char);
u_char	 colour_256to88(u_char);

/* attributes.c */
const char *attributes_tostring(u_char);
int	 attributes_fromstring(const char *);

/* grid.c */
extern const struct grid_cell grid_default_cell;
struct grid *grid_create(u_int, u_int, u_int);
void	 grid_destroy(struct grid *);
int	 grid_compare(struct grid *, struct grid *);
void	 grid_expand_line(struct grid *, u_int, u_int);
void	 grid_expand_line_utf8(struct grid *, u_int, u_int);
void	 grid_scroll_line(struct grid *);
const struct grid_cell *grid_peek_cell(struct grid *, u_int, u_int);
struct grid_cell *grid_get_cell(struct grid *, u_int, u_int);
void	 grid_set_cell(struct grid *, u_int, u_int, const struct grid_cell *);
const struct grid_utf8 *grid_peek_utf8(struct grid *, u_int, u_int);
struct grid_utf8 *grid_get_utf8(struct grid *, u_int, u_int);
void	 grid_set_utf8(struct grid *, u_int, u_int, const struct grid_utf8 *);
void	 grid_clear(struct grid *, u_int, u_int, u_int, u_int);
void	 grid_clear_lines(struct grid *, u_int, u_int);
void	 grid_move_lines(struct grid *, u_int, u_int, u_int);
void	 grid_move_cells(struct grid *, u_int, u_int, u_int, u_int);
char	*grid_string_cells(struct grid *, u_int, u_int, u_int);
void	 grid_duplicate_lines(
    	     struct grid *, u_int, struct grid *, u_int, u_int);

/* grid-view.c */
const struct grid_cell *grid_view_peek_cell(struct grid *, u_int, u_int);
struct grid_cell *grid_view_get_cell(struct grid *, u_int, u_int);
void	 grid_view_set_cell(
    	     struct grid *, u_int, u_int, const struct grid_cell *);
const struct grid_utf8 *grid_view_peek_utf8(struct grid *, u_int, u_int);
struct grid_utf8 *grid_view_get_utf8(struct grid *, u_int, u_int);
void	 grid_view_set_utf8(
    	     struct grid *, u_int, u_int, const struct grid_utf8 *);
void	 grid_view_clear(struct grid *, u_int, u_int, u_int, u_int);
void	 grid_view_scroll_region_up(struct grid *, u_int, u_int);
void	 grid_view_scroll_region_down(struct grid *, u_int, u_int);
void	 grid_view_insert_lines(struct grid *, u_int, u_int);
void	 grid_view_insert_lines_region(struct grid *, u_int, u_int, u_int);
void	 grid_view_delete_lines(struct grid *, u_int, u_int);
void	 grid_view_delete_lines_region(struct grid *, u_int, u_int, u_int);
void	 grid_view_insert_cells(struct grid *, u_int, u_int, u_int);
void	 grid_view_delete_cells(struct grid *, u_int, u_int, u_int);
char	*grid_view_string_cells(struct grid *, u_int, u_int, u_int);

/* screen-write.c */
void	 screen_write_start(
    	     struct screen_write_ctx *, struct window_pane *, struct screen *);
void	 screen_write_stop(struct screen_write_ctx *);
size_t printflike2 screen_write_strlen(int, const char *, ...);
void printflike3 screen_write_puts(struct screen_write_ctx *,
    	     struct grid_cell *, const char *, ...);
void printflike5 screen_write_nputs(struct screen_write_ctx *,
    ssize_t, struct grid_cell *, int, const char *, ...);
void	 screen_write_vnputs(struct screen_write_ctx *,
	     ssize_t, struct grid_cell *, int, const char *, va_list);
void	 screen_write_putc(
    	     struct screen_write_ctx *, struct grid_cell *, u_char);
void	 screen_write_copy(struct screen_write_ctx *,
	     struct screen *, u_int, u_int, u_int, u_int);
void	 screen_write_cursorup(struct screen_write_ctx *, u_int);
void	 screen_write_cursordown(struct screen_write_ctx *, u_int);
void	 screen_write_cursorright(struct screen_write_ctx *, u_int);
void	 screen_write_cursorleft(struct screen_write_ctx *, u_int);
void	 screen_write_alignmenttest(struct screen_write_ctx *);
void	 screen_write_insertcharacter(struct screen_write_ctx *, u_int);
void	 screen_write_deletecharacter(struct screen_write_ctx *, u_int);
void	 screen_write_insertline(struct screen_write_ctx *, u_int);
void	 screen_write_deleteline(struct screen_write_ctx *, u_int);
void	 screen_write_clearline(struct screen_write_ctx *);
void	 screen_write_clearendofline(struct screen_write_ctx *);
void	 screen_write_clearstartofline(struct screen_write_ctx *);
void	 screen_write_cursormove(struct screen_write_ctx *, u_int, u_int);
void	 screen_write_cursormode(struct screen_write_ctx *, int);
void	 screen_write_reverseindex(struct screen_write_ctx *);
void	 screen_write_scrollregion(struct screen_write_ctx *, u_int, u_int);
void	 screen_write_insertmode(struct screen_write_ctx *, int);
void	 screen_write_mousemode(struct screen_write_ctx *, int);
void	 screen_write_linefeed(struct screen_write_ctx *);
void	 screen_write_carriagereturn(struct screen_write_ctx *);
void	 screen_write_kcursormode(struct screen_write_ctx *, int);
void	 screen_write_kkeypadmode(struct screen_write_ctx *, int);
void	 screen_write_clearendofscreen(struct screen_write_ctx *);
void	 screen_write_clearstartofscreen(struct screen_write_ctx *);
void	 screen_write_clearscreen(struct screen_write_ctx *);
void	 screen_write_cell(
    	     struct screen_write_ctx *, const struct grid_cell *, u_char *);

/* screen-redraw.c */
void	 screen_redraw_screen(struct client *, int);
void	 screen_redraw_pane(struct client *, struct window_pane *);

/* screen.c */
void	 screen_init(struct screen *, u_int, u_int, u_int);
void	 screen_reinit(struct screen *);
void	 screen_free(struct screen *);
void	 screen_reset_tabs(struct screen *);
void	 screen_set_title(struct screen *, const char *);
void	 screen_resize(struct screen *, u_int, u_int);
void	 screen_set_selection(
	     struct screen *, u_int, u_int, u_int, u_int, struct grid_cell *);
void	 screen_clear_selection(struct screen *);
int	 screen_check_selection(struct screen *, u_int, u_int);

/* window.c */
extern struct windows windows;
const char	*window_default_command(void);
int		 window_cmp(struct window *, struct window *);
int		 winlink_cmp(struct winlink *, struct winlink *);
RB_PROTOTYPE(windows, window, entry, window_cmp);
RB_PROTOTYPE(winlinks, winlink, entry, winlink_cmp);
struct winlink	*winlink_find_by_index(struct winlinks *, int);
struct winlink 	*winlink_find_by_window(struct winlinks *, struct window *);
int		 winlink_next_index(struct winlinks *);
u_int		 winlink_count(struct winlinks *);
struct winlink	*winlink_add(struct winlinks *, struct window *, int);
void		 winlink_remove(struct winlinks *, struct winlink *);
struct winlink	*winlink_next(struct winlinks *, struct winlink *);
struct winlink	*winlink_previous(struct winlinks *, struct winlink *);
void		 winlink_stack_push(struct winlink_stack *, struct winlink *);
void		 winlink_stack_remove(struct winlink_stack *, struct winlink *);
int	 	 window_index(struct window *, u_int *);
struct window	*window_create1(u_int, u_int);
struct window	*window_create(const char *, const char *,
		     const char *, const char **, u_int, u_int, u_int, char **);
void		 window_destroy(struct window *);
void		 window_set_active_pane(struct window *, struct window_pane *);
struct window_pane *window_add_pane(struct window *, u_int);
void		 window_resize(struct window *, u_int, u_int);
void		 window_remove_pane(struct window *, struct window_pane *);
struct window_pane *window_pane_at_index(struct window *, u_int);
u_int		 window_pane_index(struct window *, struct window_pane *);
u_int		 window_count_panes(struct window *);
void		 window_destroy_panes(struct window *);
struct window_pane *window_pane_create(struct window *, u_int, u_int, u_int);
void		 window_pane_destroy(struct window_pane *);
int		 window_pane_spawn(struct window_pane *,
		     const char *, const char *, const char **, char **);
void		 window_pane_resize(struct window_pane *, u_int, u_int);
int		 window_pane_set_mode(
		     struct window_pane *, const struct window_mode *);
void		 window_pane_reset_mode(struct window_pane *);
void		 window_pane_parse(struct window_pane *);
void		 window_pane_key(struct window_pane *, struct client *, int);
void		 window_pane_mouse(struct window_pane *,
    		     struct client *, u_char, u_char, u_char);
int		 window_pane_visible(struct window_pane *);
char		*window_pane_search(
    		     struct window_pane *, const char *, u_int *);

/* layout.c */
struct layout_cell *layout_create_cell(struct layout_cell *);
void		 layout_free_cell(struct layout_cell *);
void		 layout_print_cell(struct layout_cell *, const char *, u_int);
void		 layout_set_size(
		     struct layout_cell *, u_int, u_int, u_int, u_int);
void		 layout_make_leaf(
		     struct layout_cell *, struct window_pane *);
void		 layout_make_node(struct layout_cell *, enum layout_type);
void		 layout_fix_offsets(struct layout_cell *);
void		 layout_fix_panes(struct window *, u_int, u_int);
u_int		 layout_resize_check(struct layout_cell *, enum layout_type);
void		 layout_resize_adjust(
		     struct layout_cell *, enum layout_type, int);
void		 layout_init(struct window *);
void		 layout_free(struct window *);
void		 layout_resize(struct window *, u_int, u_int);
void		 layout_resize_pane(
    		     struct window_pane *, enum layout_type, int);
int		 layout_split_pane(struct window_pane *,
		     enum layout_type, int, struct window_pane *);
void		 layout_close_pane(struct window_pane *);

/* layout-set.c */
const char	*layout_set_name(u_int);
int		 layout_set_lookup(const char *);
u_int		 layout_set_select(struct window *, u_int);
u_int		 layout_set_next(struct window *);
u_int		 layout_set_previous(struct window *);
void		 layout_set_active_changed(struct window *);

/* window-clock.c */
extern const struct window_mode window_clock_mode;

/* window-copy.c */
extern const struct window_mode window_copy_mode;
void 		 window_copy_pageup(struct window_pane *);

/* window-scroll.c */
extern const struct window_mode window_scroll_mode;
void 		 window_scroll_pageup(struct window_pane *);

/* window-more.c */
extern const struct window_mode window_more_mode;
void 		 window_more_vadd(struct window_pane *, const char *, va_list);

/* window-choose.c */
extern const struct window_mode window_choose_mode;
void 		 window_choose_vadd(
    		     struct window_pane *, int, const char *, va_list);
void printflike3 window_choose_add(
    		     struct window_pane *, int, const char *, ...);
void		 window_choose_ready(struct window_pane *,
		     u_int, void (*)(void *, int), void (*)(void *), void *);

/* names.c */
void		 set_window_names(void);
char 		*default_window_name(struct window *);

/* session.c */
extern struct sessions sessions;
void	 session_alert_add(struct session *, struct window *, int);
void	 session_alert_cancel(struct session *, struct winlink *);
int	 session_alert_has(struct session *, struct winlink *, int);
int	 session_alert_has_window(struct session *, struct window *, int);
struct session	*session_find(const char *);
struct session	*session_create(const char *, const char *,
    		     const char *, u_int, u_int, char **);
void	 	 session_destroy(struct session *);
int	 	 session_index(struct session *, u_int *);
struct winlink	*session_new(struct session *,
	    	     const char *, const char *, const char *, int, char **);
struct winlink	*session_attach(
    		     struct session *, struct window *, int, char **);
int		 session_detach(struct session *, struct winlink *);
int		 session_has(struct session *, struct window *);
int		 session_next(struct session *, int);
int		 session_previous(struct session *, int);
int		 session_select(struct session *, int);
int		 session_last(struct session *);

/* utf8.c */
void	utf8_build(void);
int	utf8_width(const u_char *);

/* procname.c */
char   *get_proc_name(int, char *);

/* buffer.c */
struct buffer 	*buffer_create(size_t);
void		 buffer_destroy(struct buffer *);
void		 buffer_ensure(struct buffer *, size_t);
void		 buffer_add(struct buffer *, size_t);
void		 buffer_remove(struct buffer *, size_t);
void		 buffer_write(struct buffer *, const void *, size_t);
void		 buffer_read(struct buffer *, void *, size_t);
void	 	 buffer_write8(struct buffer *, uint8_t);
uint8_t		 buffer_read8(struct buffer *);

/* buffer-poll.c */
int		 buffer_poll(struct pollfd *, struct buffer *, struct buffer *);

/* log.c */
void		 log_open_tty(int);
void		 log_open_file(int, const char *);
void		 log_close(void);
void printflike1 log_warn(const char *, ...);
void printflike1 log_warnx(const char *, ...);
void printflike1 log_info(const char *, ...);
void printflike1 log_debug(const char *, ...);
void printflike1 log_debug2(const char *, ...);
__dead void	 log_fatal(const char *, ...);
__dead void	 log_fatalx(const char *, ...);

/* xmalloc.c */
char		*xstrdup(const char *);
void		*xcalloc(size_t, size_t);
void		*xmalloc(size_t);
void		*xrealloc(void *, size_t, size_t);
void		 xfree(void *);
int printflike2	 xasprintf(char **, const char *, ...);
int		 xvasprintf(char **, const char *, va_list);
int printflike3	 xsnprintf(char *, size_t, const char *, ...);
int		 xvsnprintf(char *, size_t, const char *, va_list);

#endif /* TMUX_H */