path: root/lib/libcurses/curses.priv.h

/* $OpenBSD: curses.priv.h,v 1.35 2021/03/10 20:16:08 millert Exp $ */

/****************************************************************************
 * Copyright (c) 1998-2007,2008 Free Software Foundation, Inc.              *
 *                                                                          *
 * Permission is hereby granted, free of charge, to any person obtaining a  *
 * copy of this software and associated documentation files (the            *
 * "Software"), to deal in the Software without restriction, including      *
 * without limitation the rights to use, copy, modify, merge, publish,      *
 * distribute, distribute with modifications, sublicense, and/or sell       *
 * copies of the Software, and to permit persons to whom the Software is    *
 * furnished to do so, subject to the following conditions:                 *
 *                                                                          *
 * The above copyright notice and this permission notice shall be included  *
 * in all copies or substantial portions of the Software.                   *
 *                                                                          *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS  *
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF               *
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.   *
 * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,   *
 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR    *
 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR    *
 * THE USE OR OTHER DEALINGS IN THE SOFTWARE.                               *
 *                                                                          *
 * Except as contained in this notice, the name(s) of the above copyright   *
 * holders shall not be used in advertising or otherwise to promote the     *
 * sale, use or other dealings in this Software without prior written       *
 * authorization.                                                           *
 ****************************************************************************/

/****************************************************************************
 *  Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995               *
 *     and: Eric S. Raymond <esr@snark.thyrsus.com>                         *
 *     and: Thomas E. Dickey                        1996-on                 *
 ****************************************************************************/


/*
 * $Id: curses.priv.h,v 1.35 2021/03/10 20:16:08 millert Exp $
 *
 *	curses.priv.h
 *
 *	Header file for curses library objects which are private to
 *	the library.
 *
 */

#ifndef CURSES_PRIV_H
#define CURSES_PRIV_H 1

#if !defined(NCURSES_IMPEXP)
#  define NCURSES_IMPEXP /* nothing */
#endif
#if !defined(NCURSES_API)
#  define NCURSES_API /* nothing */
#endif
#if !defined(NCURSES_EXPORT)
#  define NCURSES_EXPORT(type) NCURSES_IMPEXP type NCURSES_API
#endif
#if !defined(NCURSES_EXPORT_VAR)
#  define NCURSES_EXPORT_VAR(type) NCURSES_IMPEXP type
#endif

#ifdef __cplusplus
extern "C" {
#endif

#include <ncurses_cfg.h>

#if USE_RCS_IDS
#define MODULE_ID(id) static const char Ident[] = id;
#else
#define MODULE_ID(id) /*nothing*/
#endif

#include <stdlib.h>
#include <string.h>
#include <sys/types.h>

#if HAVE_UNISTD_H
#include <unistd.h>
#endif

#if HAVE_SYS_BSDTYPES_H
#include <sys/bsdtypes.h>	/* needed for ISC */
#endif

#if HAVE_LIMITS_H
# include <limits.h>
#elif HAVE_SYS_PARAM_H
# include <sys/param.h>
#endif

#include <assert.h>
#include <stdio.h>

#include <errno.h>

#ifndef PATH_MAX
# if defined(_POSIX_PATH_MAX)
#  define PATH_MAX _POSIX_PATH_MAX
# elif defined(MAXPATHLEN)
#  define PATH_MAX MAXPATHLEN
# else
#  define PATH_MAX 255	/* the Posix minimum path-size */
# endif
#endif

#if DECL_ERRNO
extern int errno;
#endif

#include <nc_panel.h>

/* Some systems have a broken 'select()', but workable 'poll()'.  Use that */
#if HAVE_WORKING_POLL
#define USE_FUNC_POLL 1
#if HAVE_POLL_H
#include <poll.h>
#else
#include <sys/poll.h>
#endif
#else
#define USE_FUNC_POLL 0
#endif

/* include signal.h before curses.h to work-around defect in glibc 2.1.3 */
#include <signal.h>

/* Alessandro Rubini's GPM (general-purpose mouse) */
#if HAVE_LIBGPM && HAVE_GPM_H
#define USE_GPM_SUPPORT 1
#else
#define USE_GPM_SUPPORT 0
#endif

/* QNX mouse support */
#if defined(__QNX__) && !defined(__QNXNTO__)
#define USE_QNX_MOUSE 1
#else
#define USE_QNX_MOUSE 0
#endif

/* EMX mouse support */
#ifdef __EMX__
#define USE_EMX_MOUSE 1
#else
#define USE_EMX_MOUSE 0
#endif

#define DEFAULT_MAXCLICK 166
#define EV_MAX		8	/* size of mouse circular event queue */

/*
 * If we don't have signals to support it, don't add a sigwinch handler.
 * In any case, resizing is an extended feature.  Use it if we've got it.
 */
#if !NCURSES_EXT_FUNCS
#undef HAVE_SIZECHANGE
#define HAVE_SIZECHANGE 0
#endif

#if HAVE_SIZECHANGE && USE_SIGWINCH && defined(SIGWINCH)
#define USE_SIZECHANGE 1
#else
#define USE_SIZECHANGE 0
#undef USE_SIGWINCH
#define USE_SIGWINCH 0
#endif

/*
 * If desired, one can configure this, disabling environment variables that
 * point to custom terminfo/termcap locations.
 */
#ifdef USE_ROOT_ENVIRON
#ifdef __OpenBSD__
#define use_terminfo_vars() (!issetugid())
#else
#define use_terminfo_vars() 1
#endif
#else
#define use_terminfo_vars() _nc_env_access()
extern NCURSES_EXPORT(int) _nc_env_access (void);
#endif

/*
 * Not all platforms have memmove; some have an equivalent bcopy.  (Some may
 * have neither).
 */
#if USE_OK_BCOPY
#define memmove(d,s,n) bcopy(s,d,n)
#elif USE_MY_MEMMOVE
#define memmove(d,s,n) _nc_memmove(d,s,n)
extern NCURSES_EXPORT(void *) _nc_memmove (void *, const void *, size_t);
#endif

/*
 * Scroll hints are useless when hashmap is used
 */
#if !USE_SCROLL_HINTS
#if !USE_HASHMAP
#define USE_SCROLL_HINTS 1
#else
#define USE_SCROLL_HINTS 0
#endif
#endif

#if USE_SCROLL_HINTS
#define if_USE_SCROLL_HINTS(stmt) stmt
#else
#define if_USE_SCROLL_HINTS(stmt) /*nothing*/
#endif

/*
 * Note:  ht/cbt expansion flakes out randomly under Linux 1.1.47, but only
 * when we're throwing control codes at the screen at high volume.  To see
 * this, re-enable USE_HARD_TABS and run worm for a while.  Other systems
 * probably don't want to define this either due to uncertainties about tab
 * delays and expansion in raw mode.
 */

#define TRIES struct tries
typedef TRIES {
	TRIES    *child;            /* ptr to child.  NULL if none          */
	TRIES    *sibling;          /* ptr to sibling.  NULL if none        */
	unsigned char    ch;        /* character at this node               */
	unsigned short   value;     /* code of string so far.  0 if none.   */
#undef TRIES
} TRIES;

/*
 * Common/troublesome character definitions
 */
#define StringOf(ch) {ch, 0}

#define L_BRACE '{'
#define R_BRACE '}'
#define S_QUOTE '\''
#define D_QUOTE '"'

#define VT_ACSC "``aaffggiijjkkllmmnnooppqqrrssttuuvvwwxxyyzz{{||}}~~"

/*
 * Structure for palette tables
 */

typedef struct
{
    short red, green, blue;	/* what color_content() returns */
    short r, g, b;		/* params to init_color() */
    int init;			/* true if we called init_color() */
}
color_t;

#define MAXCOLUMNS    135
#define MAXLINES      66
#define FIFO_SIZE     MAXCOLUMNS+2  /* for nocbreak mode input */

#define ACS_LEN       128

#define WINDOWLIST struct _win_list

#if USE_WIDEC_SUPPORT
#define _nc_bkgd    _bkgrnd
#define _XOPEN_SOURCE_EXTENDED 1
#else
#undef _XOPEN_SOURCE_EXTENDED
#define _nc_bkgd    _bkgd
#define wgetbkgrnd(win, wch)	*wch = win->_bkgd
#define wbkgrnd	    wbkgd
#endif

#undef NCURSES_OPAQUE
#define NCURSES_INTERNALS 1
#define NCURSES_OPAQUE 0

#include <curses.h>	/* we'll use -Ipath directive to get the right one! */
#include <term.h>
#include <term_entry.h>
#include <nc_tparm.h>

#if NCURSES_EXT_COLORS && USE_WIDEC_SUPPORT
#define if_EXT_COLORS(stmt)	stmt
#define NetPair(value,p)	(value).ext_color = (p), \
				AttrOf(value) &= ALL_BUT_COLOR, \
				AttrOf(value) |= (A_COLOR & COLOR_PAIR((p > 255) ? 255 : p))
#define SetPair(value,p)	(value).ext_color = (p)
#define GetPair(value)		(value).ext_color
#define unColor(n)		(AttrOf(n) & ALL_BUT_COLOR)
#define GET_WINDOW_PAIR(w)	(w)->_color
#define SET_WINDOW_PAIR(w,p)	(w)->_color = (p)
#define SameAttrOf(a,b)		(AttrOf(a) == AttrOf(b) && GetPair(a) == GetPair(b))
#define VIDATTR(attr, pair)	vid_attr(attr, pair, 0)
#else
#define if_EXT_COLORS(stmt)	/* nothing */
#define SetPair(value,p)	RemAttr(value, A_COLOR), \
				SetAttr(value, AttrOf(value) | (A_COLOR & COLOR_PAIR(p)))
#define GetPair(value)		PAIR_NUMBER(AttrOf(value))
#define unColor(n)		(AttrOf(n) & ALL_BUT_COLOR)
#define GET_WINDOW_PAIR(w)	PAIR_NUMBER(WINDOW_ATTRS(w))
#define SET_WINDOW_PAIR(w,p)	WINDOW_ATTRS(w) &= ALL_BUT_COLOR, \
				WINDOW_ATTRS(w) |= (A_COLOR & COLOR_PAIR(p))
#define SameAttrOf(a,b)		(AttrOf(a) == AttrOf(b))
#define VIDATTR(attr, pair)	vidattr(attr)
#endif

#if NCURSES_NO_PADDING
#define GetNoPadding(sp)	((sp) ? (sp)->_no_padding : _nc_prescreen._no_padding)
#define SetNoPadding(sp)	_nc_set_no_padding(sp)
extern NCURSES_EXPORT(void) _nc_set_no_padding(SCREEN *);
#else
#define GetNoPadding(sp)	FALSE
#define SetNoPadding(sp)	/*nothing*/
#endif

#define WINDOW_ATTRS(w)		((w)->_attrs)

#define SCREEN_ATTRS(s)		(*((s)->_current_attr))
#define GET_SCREEN_PAIR(s)	GetPair(SCREEN_ATTRS(s))
#define SET_SCREEN_PAIR(s,p)	SetPair(SCREEN_ATTRS(s), p)

#if USE_REENTRANT
NCURSES_EXPORT(int *) _nc_ptr_Lines (void);
NCURSES_EXPORT(int *) _nc_ptr_Cols (void);
#define ptrLines() (SP ? &(SP->_LINES) : &(_nc_prescreen._LINES))
#define ptrCols()  (SP ? &(SP->_COLS)  : &(_nc_prescreen._COLS))
#define SET_LINES(value) *_nc_ptr_Lines() = value
#define SET_COLS(value)  *_nc_ptr_Cols() = value
#else
#define ptrLines() &LINES
#define ptrCols()  &COLS
#define SET_LINES(value) LINES = value
#define SET_COLS(value)  COLS = value
#endif

#define TR_MUTEX(data) _tracef("%s@%d: me:%08lX COUNT:%2u/%2d/%6d/%2d/%s%9u: " #data, \
	    __FILE__, __LINE__, \
	    (unsigned long) (pthread_self()), \
	    data.__data.__lock, \
	    data.__data.__count, \
	    data.__data.__owner, \
	    data.__data.__kind, \
	    (data.__data.__nusers > 5) ? " OOPS " : "", \
	    data.__data.__nusers)
#define TR_GLOBAL_MUTEX(name) TR_MUTEX(_nc_globals.mutex_##name)

#ifdef USE_PTHREADS

#if USE_REENTRANT
#include <pthread.h>
extern NCURSES_EXPORT(void) _nc_init_pthreads(void);
extern NCURSES_EXPORT(void) _nc_mutex_init(pthread_mutex_t *);
extern NCURSES_EXPORT(int) _nc_mutex_lock(pthread_mutex_t *);
extern NCURSES_EXPORT(int) _nc_mutex_trylock(pthread_mutex_t *);
extern NCURSES_EXPORT(int) _nc_mutex_unlock(pthread_mutex_t *);
#define _nc_lock_global(name)	_nc_mutex_lock(&_nc_globals.mutex_##name)
#define _nc_try_global(name)    _nc_mutex_trylock(&_nc_globals.mutex_##name)
#define _nc_unlock_global(name)	_nc_mutex_unlock(&_nc_globals.mutex_##name)

#else
#error POSIX threads requires --enable-reentrant option
#endif

#if USE_WEAK_SYMBOLS
#if defined(__GNUC__)
#  if defined __USE_ISOC99
#    define _cat_pragma(exp)	_Pragma(#exp)
#    define _weak_pragma(exp)	_cat_pragma(weak name)
#  else
#    define _weak_pragma(exp)
#  endif
#  define _declare(name)	__extension__ extern __typeof__(name) name
#  define weak_symbol(name)	_weak_pragma(name) _declare(name) __attribute__((weak))
#endif
#endif

#ifdef USE_PTHREADS
#  if USE_WEAK_SYMBOLS
weak_symbol(pthread_sigmask);
weak_symbol(pthread_self);
weak_symbol(pthread_equal);
weak_symbol(pthread_mutex_init);
weak_symbol(pthread_mutex_lock);
weak_symbol(pthread_mutex_unlock);
weak_symbol(pthread_mutex_trylock);
weak_symbol(pthread_mutexattr_settype);
weak_symbol(pthread_mutexattr_init);
extern NCURSES_EXPORT(int) _nc_sigprocmask(int, const sigset_t *, sigset_t *);
#    undef  sigprocmask
#    define sigprocmask _nc_sigprocmask
#  endif
#endif

#if HAVE_NANOSLEEP
#undef HAVE_NANOSLEEP
#define HAVE_NANOSLEEP 0	/* nanosleep suspends all threads */
#endif

#else /* !USE_PTHREADS */

#define _nc_init_pthreads()	/* nothing */
#define _nc_mutex_init(obj)	/* nothing */

#define _nc_lock_global(name)	/* nothing */
#define _nc_try_global(name)    0
#define _nc_unlock_global(name)	/* nothing */

#endif /* USE_PTHREADS */

#if HAVE_GETTIMEOFDAY
# define PRECISE_GETTIME 1
# define TimeType struct timeval
#else
# define PRECISE_GETTIME 0
# define TimeType time_t
#endif

/*
 * Definitions for color pairs
 */
typedef unsigned colorpair_t;	/* type big enough to store PAIR_OF() */
#define C_SHIFT 9		/* we need more bits than there are colors */
#define C_MASK			((1 << C_SHIFT) - 1)
#define PAIR_OF(fg, bg)		((((fg) & C_MASK) << C_SHIFT) | ((bg) & C_MASK))
#define isDefaultColor(c)	((c) >= COLOR_DEFAULT || (c) < 0)

#define COLOR_DEFAULT		C_MASK

#if defined(USE_TERMLIB) && !defined(NEED_NCURSES_CH_T)

#undef NCURSES_CH_T		/* this is not a termlib feature */
#define NCURSES_CH_T void	/* ...but we need a pointer in SCREEN */

#endif	/* USE_TERMLIB */

#ifndef USE_TERMLIB
struct ldat
{
	NCURSES_CH_T	*text;		/* text of the line */
	NCURSES_SIZE_T	firstchar;	/* first changed character in the line */
	NCURSES_SIZE_T	lastchar;	/* last changed character in the line */
	NCURSES_SIZE_T	oldindex;	/* index of the line at last update */
};
#endif	/* USE_TERMLIB */

typedef enum {
	M_XTERM	= -1		/* use xterm's mouse tracking? */
	,M_NONE = 0		/* no mouse device */
#if USE_GPM_SUPPORT
	,M_GPM			/* use GPM */
#endif
#if USE_SYSMOUSE
	,M_SYSMOUSE		/* FreeBSD sysmouse on console */
#endif
} MouseType;

/*
 * Structures for scrolling.
 */

typedef struct {
	unsigned long hashval;
	int oldcount, newcount;
	int oldindex, newindex;
} HASHMAP;

/*
 * Structures for soft labels.
 */

struct _SLK;

#ifndef USE_TERMLIB

typedef struct
{
	char *ent_text;		/* text for the label */
	char *form_text;	/* formatted text (left/center/...) */
	int ent_x;		/* x coordinate of this field */
	char dirty;		/* this label has changed */
	char visible;		/* field is visible */
} slk_ent;

typedef struct _SLK {
	char dirty;		/* all labels have changed */
	char hidden;		/* soft labels are hidden */
	WINDOW *win;
	slk_ent *ent;
	short  maxlab;		/* number of available labels */
	short  labcnt;		/* number of allocated labels */
	short  maxlen;		/* length of labels */
	NCURSES_CH_T attr;	/* soft label attribute */
} SLK;

#endif	/* USE_TERMLIB */

typedef	struct {
	WINDOW *win;		/* the window used in the hook      */
	int	line;		/* lines to take, < 0 => from bottom*/
	int	(*hook)(WINDOW *, int); /* callback for user	    */
} ripoff_t;

#if USE_GPM_SUPPORT
#undef buttons			/* term.h defines this, and gpm uses it! */
#include <gpm.h>

#ifdef HAVE_LIBDL
/* link dynamically to GPM */
typedef int *TYPE_gpm_fd;
typedef int (*TYPE_Gpm_Open) (Gpm_Connect *, int);
typedef int (*TYPE_Gpm_Close) (void);
typedef int (*TYPE_Gpm_GetEvent) (Gpm_Event *);

#define my_gpm_fd       SP->_mouse_gpm_fd
#define my_Gpm_Open     SP->_mouse_Gpm_Open
#define my_Gpm_Close    SP->_mouse_Gpm_Close
#define my_Gpm_GetEvent SP->_mouse_Gpm_GetEvent
#else
/* link statically to GPM */
#define my_gpm_fd       &gpm_fd
#define my_Gpm_Open     Gpm_Open
#define my_Gpm_Close    Gpm_Close
#define my_Gpm_GetEvent Gpm_GetEvent
#endif /* HAVE_LIBDL */
#endif /* USE_GPM_SUPPORT */

typedef struct {
    long sequence;
    bool last_used;
    char *fix_sgr0;		/* this holds the filtered sgr0 string */
    char *last_bufp;		/* help with fix_sgr0 leak */
    TERMINAL *last_term;
} TGETENT_CACHE;

#define TGETENT_MAX 4

/*
 * State of tparm().
 */
#define STACKSIZE 20

typedef struct {
	union {
		int	num;
		char	*str;
	} data;
	bool num_type;
} STACK_FRAME;

#define NUM_VARS 26

typedef struct {
#ifdef TRACE
	const char	*tname;
#endif
	const char	*tparam_base;

	STACK_FRAME	stack[STACKSIZE];
	int		stack_ptr;

	char		*out_buff;
	size_t		out_size;
	size_t		out_used;

	char		*fmt_buff;
	size_t		fmt_size;

	int		dynamic_var[NUM_VARS];
	int		static_vars[NUM_VARS];
} TPARM_STATE;

typedef struct {
    char *text;
    size_t size;
} TRACEBUF;

/*
 * The filesystem database normally uses a single-letter for the lower level
 * of directories.  Use a hexadecimal code for filesystems which do not
 * preserve mixed-case names.
 */
#if MIXEDCASE_FILENAMES
#define LEAF_FMT "%c"
#else
#define LEAF_FMT "%02x"
#endif

/*
 * TRACEMSE_FMT is no longer than 80 columns, there are 5 numbers that
 * could at most have 10 digits, and the mask contains no more than 32 bits
 * with each bit representing less than 15 characters.  Usually the whole
 * string is less than 80 columns, but this buffer size is an absolute
 * limit.
 */
#define TRACEMSE_MAX	(80 + (5 * 10) + (32 * 15))
#define TRACEMSE_FMT	"id %2d  at (%2d, %2d, %2d) state %4lx = {" /* } */

/*
 * Global data which is not specific to a screen.
 */
typedef struct {
	SIG_ATOMIC_T	have_sigwinch;
	SIG_ATOMIC_T	cleanup_nested;

	bool		init_signals;
	bool		init_screen;

	const char	*comp_sourcename;
	char		*comp_termtype;

	bool		have_tic_directory;
	bool		keep_tic_directory;
	const char	*tic_directory;

	char		*dbi_list;
	int		dbi_size;

	char		*first_name;
	char		**keyname_table;

	int		slk_format;

	char		*safeprint_buf;
	size_t		safeprint_used;

	TGETENT_CACHE	tgetent_cache[TGETENT_MAX];
	int		tgetent_index;
	long		tgetent_sequence;

	WINDOWLIST	*_nc_windowlist;
#define _nc_windows	_nc_globals._nc_windowlist

#if USE_HOME_TERMINFO
	char		*home_terminfo;
#endif

#if !USE_SAFE_SPRINTF
	int		safeprint_cols;
	int		safeprint_rows;
#endif

#ifdef TRACE
	bool		init_trace;
	char		trace_fname[PATH_MAX];
	int		trace_level;
	FILE		*trace_fp;

	char		*tracearg_buf;
	size_t		tracearg_used;

	TRACEBUF	*tracebuf_ptr;
	size_t		tracebuf_used;

	char		tracechr_buf[40];

	char		*tracedmp_buf;
	size_t		tracedmp_used;

	unsigned char	*tracetry_buf;
	size_t		tracetry_used;

#define _nc_globals_traceatr_color_buf_size 80
	char		traceatr_color_buf[2][_nc_globals_traceatr_color_buf_size];
	int		traceatr_color_sel;
	int		traceatr_color_last;

#endif	/* TRACE */

#ifdef USE_PTHREADS
	pthread_mutex_t	mutex_curses;
	pthread_mutex_t	mutex_tst_tracef;
	pthread_mutex_t	mutex_tracef;
	int		nested_tracef;
	int		use_pthreads;
#define _nc_use_pthreads	_nc_globals.use_pthreads
#endif
} NCURSES_GLOBALS;

extern NCURSES_EXPORT_VAR(NCURSES_GLOBALS) _nc_globals;

#define N_RIPS 5

/*
 * Global data which can be swept up into a SCREEN when one is created.
 * It may be modified before the next SCREEN is created.
 */
typedef struct {
	bool		use_env;
	bool		filter_mode;
	attr_t		previous_attr;
	ripoff_t	rippedoff[N_RIPS];
	ripoff_t	*rsp;
	TPARM_STATE	tparm_state;
	TTY		*saved_tty;	/* savetty/resetty information	    */
#if NCURSES_NO_PADDING
	bool		_no_padding;	/* flag to set if padding disabled  */
#endif
#if BROKEN_LINKER || USE_REENTRANT
	chtype		*real_acs_map;
	int		_LINES;
	int		_COLS;
	TERMINAL	*_cur_term;
#ifdef TRACE
	long		_outchars;
	const char	*_tputs_trace;
#endif
#endif
} NCURSES_PRESCREEN;

#define ripoff_sp	_nc_prescreen.rsp
#define ripoff_stack	_nc_prescreen.rippedoff

extern NCURSES_EXPORT_VAR(NCURSES_PRESCREEN) _nc_prescreen;

/*
 * The SCREEN structure.
 */

struct screen {
	int		_ifd;		/* input file ptr for screen	    */
	FILE		*_ofp;		/* output file ptr for screen	    */
	char		*_setbuf;	/* buffered I/O for output	    */
	bool		_filtered;	/* filter() was called		    */
	bool		_buffered;	/* setvbuf uses _setbuf data	    */
	int		_checkfd;	/* filedesc for typeahead check	    */
	TERMINAL	*_term;		/* terminal type information	    */
	TTY		_saved_tty;	/* savetty/resetty information	    */
	NCURSES_SIZE_T	_lines;		/* screen lines			    */
	NCURSES_SIZE_T	_columns;	/* screen columns		    */

	NCURSES_SIZE_T	_lines_avail;	/* lines available for stdscr	    */
	NCURSES_SIZE_T	_topstolen;	/* lines stolen from top	    */

	WINDOW		*_curscr;	/* current screen		    */
	WINDOW		*_newscr;	/* virtual screen to be updated to  */
	WINDOW		*_stdscr;	/* screen's full-window context	    */

	TRIES		*_keytry;	/* "Try" for use with keypad mode   */
	TRIES		*_key_ok;	/* Disabled keys via keyok(,FALSE)  */
	bool		_tried;		/* keypad mode was initialized	    */
	bool		_keypad_on;	/* keypad mode is currently on	    */

	bool		_called_wgetch;	/* check for recursion in wgetch()  */
	int		_fifo[FIFO_SIZE];	/* input push-back buffer   */
	short		_fifohead,	/* head of fifo queue		    */
			_fifotail,	/* tail of fifo queue		    */
			_fifopeek,	/* where to peek for next char	    */
			_fifohold;	/* set if breakout marked	    */

	int		_endwin;	/* are we out of window mode?	    */
	NCURSES_CH_T	*_current_attr; /* holds current attributes set	    */
	int		_coloron;	/* is color enabled?		    */
	int		_color_defs;	/* are colors modified		    */
	int		_cursor;	/* visibility of the cursor	    */
	int		_cursrow;	/* physical cursor row		    */
	int		_curscol;	/* physical cursor column	    */
	bool		_notty;		/* true if we cannot switch non-tty */
	int		_nl;		/* True if NL -> CR/NL is on	    */
	int		_raw;		/* True if in raw mode		    */
	int		_cbreak;	/* 1 if in cbreak mode		    */
					/* > 1 if in halfdelay mode	    */
	int		_echo;		/* True if echo on		    */
	int		_use_meta;	/* use the meta key?		    */
	struct _SLK	*_slk;		/* ptr to soft key struct / NULL    */
	int		slk_format;	/* selected format for this screen  */
	/* cursor movement costs; units are 10ths of milliseconds */
#if NCURSES_NO_PADDING
	bool		_no_padding;	/* flag to set if padding disabled  */
#endif
	int		_char_padding;	/* cost of character put	    */
	int		_cr_cost;	/* cost of (carriage_return)	    */
	int		_cup_cost;	/* cost of (cursor_address)	    */
	int		_home_cost;	/* cost of (cursor_home)	    */
	int		_ll_cost;	/* cost of (cursor_to_ll)	    */
#if USE_HARD_TABS
	int		_ht_cost;	/* cost of (tab)		    */
	int		_cbt_cost;	/* cost of (backtab)		    */
#endif /* USE_HARD_TABS */
	int		_cub1_cost;	/* cost of (cursor_left)	    */
	int		_cuf1_cost;	/* cost of (cursor_right)	    */
	int		_cud1_cost;	/* cost of (cursor_down)	    */
	int		_cuu1_cost;	/* cost of (cursor_up)		    */
	int		_cub_cost;	/* cost of (parm_cursor_left)	    */
	int		_cuf_cost;	/* cost of (parm_cursor_right)	    */
	int		_cud_cost;	/* cost of (parm_cursor_down)	    */
	int		_cuu_cost;	/* cost of (parm_cursor_up)	    */
	int		_hpa_cost;	/* cost of (column_address)	    */
	int		_vpa_cost;	/* cost of (row_address)	    */
	/* used in tty_update.c, must be chars */
	int		_ed_cost;	/* cost of (clr_eos)		    */
	int		_el_cost;	/* cost of (clr_eol)		    */
	int		_el1_cost;	/* cost of (clr_bol)		    */
	int		_dch1_cost;	/* cost of (delete_character)	    */
	int		_ich1_cost;	/* cost of (insert_character)	    */
	int		_dch_cost;	/* cost of (parm_dch)		    */
	int		_ich_cost;	/* cost of (parm_ich)		    */
	int		_ech_cost;	/* cost of (erase_chars)	    */
	int		_rep_cost;	/* cost of (repeat_char)	    */
	int		_hpa_ch_cost;	/* cost of (column_address)	    */
	int		_cup_ch_cost;	/* cost of (cursor_address)	    */
	int		_cuf_ch_cost;	/* cost of (parm_cursor_right)	    */
	int		_inline_cost;	/* cost of inline-move		    */
	int		_smir_cost;	/* cost of (enter_insert_mode)	    */
	int		_rmir_cost;	/* cost of (exit_insert_mode)	    */
	int		_ip_cost;	/* cost of (insert_padding)	    */
	/* used in lib_mvcur.c */
	char *		_address_cursor;
	/* used in tty_update.c */
	int		_scrolling;	/* 1 if terminal's smart enough to  */

	/* used in lib_color.c */
	color_t		*_color_table;	/* screen's color palette	     */
	int		_color_count;	/* count of colors in palette	     */
	colorpair_t	*_color_pairs;	/* screen's color pair list	     */
	int		_pair_count;	/* count of color pairs		     */
#if NCURSES_EXT_FUNCS
	bool		_default_color; /* use default colors		     */
	bool		_has_sgr_39_49; /* has ECMA default color support    */
	int		_default_fg;	/* assumed default foreground	     */
	int		_default_bg;	/* assumed default background	     */
#endif
	chtype		_ok_attributes; /* valid attributes for terminal     */
	chtype		_xmc_suppress;	/* attributes to suppress if xmc     */
	chtype		_xmc_triggers;	/* attributes to process if xmc	     */
	chtype *	_acs_map;	/* the real alternate-charset map    */
	bool *		_screen_acs_map;


	/* used in lib_vidattr.c */
	bool		_use_rmso;	/* true if we may use 'rmso'	     */
	bool		_use_rmul;	/* true if we may use 'rmul'	     */

	/*
	 * These data correspond to the state of the idcok() and idlok()
	 * functions.  A caveat is in order here:  the XSI and SVr4
	 * documentation specify that these functions apply to the window which
	 * is given as an argument.  However, ncurses implements this logic
	 * only for the newscr/curscr update process, _not_ per-window.
	 */
	bool		_nc_sp_idlok;
	bool		_nc_sp_idcok;
#define _nc_idlok SP->_nc_sp_idlok
#define _nc_idcok SP->_nc_sp_idcok

	/*
	 * These are the data that support the mouse interface.
	 */
	bool		_mouse_initialized;
	MouseType	_mouse_type;
	int		_maxclick;
	bool		(*_mouse_event) (SCREEN *);
	bool		(*_mouse_inline)(SCREEN *);
	bool		(*_mouse_parse) (SCREEN *, int);
	void		(*_mouse_resume)(SCREEN *);
	void		(*_mouse_wrap)	(SCREEN *);
	int		_mouse_fd;	/* file-descriptor, if any */
	bool		_mouse_active;	/* true if initialized */
	mmask_t		_mouse_mask;
	NCURSES_CONST char *_mouse_xtermcap; /* string to enable/disable mouse */
	MEVENT		_mouse_events[EV_MAX];	/* hold the last mouse event seen */
	MEVENT		*_mouse_eventp;	/* next free slot in event queue */

#if USE_GPM_SUPPORT
	bool		_mouse_gpm_loaded;
	bool		_mouse_gpm_found;
#ifdef HAVE_LIBDL
	void		*_dlopen_gpm;
	TYPE_gpm_fd	_mouse_gpm_fd;
	TYPE_Gpm_Open	_mouse_Gpm_Open;
	TYPE_Gpm_Close	_mouse_Gpm_Close;
	TYPE_Gpm_GetEvent _mouse_Gpm_GetEvent;
#endif
	Gpm_Connect	_mouse_gpm_connect;
#endif /* USE_GPM_SUPPORT */

#if USE_EMX_MOUSE
	int		_emxmouse_wfd;
	int		_emxmouse_thread;
	int		_emxmouse_activated;
	char		_emxmouse_buttons[4];
#endif

#if USE_SYSMOUSE
	MEVENT		_sysmouse_fifo[FIFO_SIZE];
	int		_sysmouse_head;
	int		_sysmouse_tail;
	int		_sysmouse_char_width;	/* character width */
	int		_sysmouse_char_height;	/* character height */
	int		_sysmouse_old_buttons;
	int		_sysmouse_new_buttons;
#endif

	/*
	 * This supports automatic resizing
	 */
#if USE_SIZECHANGE
	int		(*_resize)(int,int);
	int		(*_ungetch)(SCREEN *, int);
#endif

	/*
	 * These are data that support the proper handling of the panel stack on an
	 * per screen basis.
	 */
	struct panelhook _panelHook;

	bool		_sig_winch;
	SCREEN		*_next_screen;

	/* hashes for old and new lines */
	unsigned long	*oldhash, *newhash;
	HASHMAP		*hashtab;
	int		hashtab_len;
	int		*_oldnum_list;
	int		_oldnum_size;

	bool		_cleanup;	/* cleanup after int/quit signal */
	int		(*_outch)(int); /* output handler if not putc */

	int		_legacy_coding;	/* see use_legacy_coding() */

#if USE_REENTRANT
	char		_ttytype[NAMESIZE];
	int		_ESCDELAY;
	int		_TABSIZE;
	int		_LINES;
	int		_COLS;
#ifdef TRACE
	long		_outchars;
	const char	*_tputs_trace;
#endif
#endif

#ifdef TRACE
#define _nc_screen_tracechr_buf_size 40
	char		tracechr_buf[_nc_screen_tracechr_buf_size];
	char		tracemse_buf[TRACEMSE_MAX];
#endif
	/*
	 * ncurses/ncursesw are the same up to this point.
	 */
#if USE_WIDEC_SUPPORT
	/* recent versions of 'screen' have partially-working support for
	 * UTF-8, but do not permit ACS at the same time (see tty_update.c).
	 */
	bool		_screen_acs_fix;
#endif
};

extern NCURSES_EXPORT_VAR(SCREEN *) _nc_screen_chain;
extern NCURSES_EXPORT_VAR(SIG_ATOMIC_T) _nc_have_sigwinch;

	WINDOWLIST {
	WINDOW	win;		/* first, so WINDOW_EXT() works */
	WINDOWLIST *next;
	SCREEN *screen;		/* screen containing the window */
#ifdef _XOPEN_SOURCE_EXTENDED
	char addch_work[(MB_LEN_MAX * 9) + 1];
	unsigned addch_used;	/* number of bytes in addch_work[] */
	int addch_x;		/* x-position for addch_work[] */
	int addch_y;		/* y-position for addch_work[] */
#endif
};

#define WINDOW_EXT(win,field) (((WINDOWLIST *)(win))->field)

/* usually in <limits.h> */
#ifndef UCHAR_MAX
#define UCHAR_MAX 255
#endif

/* The terminfo source is assumed to be 7-bit ASCII */
#define is7bits(c)	((unsigned)(c) < 128)

/* Checks for isprint() should be done on 8-bit characters (non-wide) */
#define is8bits(c)	((unsigned)(c) <= UCHAR_MAX)

#ifndef min
#define min(a,b)	((a) > (b)  ?  (b)  :  (a))
#endif

#ifndef max
#define max(a,b)	((a) < (b)  ?  (b)  :  (a))
#endif

/* usually in <unistd.h> */
#ifndef STDIN_FILENO
#define STDIN_FILENO 0
#endif

#ifndef STDOUT_FILENO
#define STDOUT_FILENO 1
#endif

#ifndef STDERR_FILENO
#define STDERR_FILENO 2
#endif

#ifndef EXIT_SUCCESS
#define EXIT_SUCCESS 0
#endif

#ifndef EXIT_FAILURE
#define EXIT_FAILURE 1
#endif

#ifndef R_OK
#define	R_OK	4		/* Test for read permission.  */
#endif
#ifndef W_OK
#define	W_OK	2		/* Test for write permission.  */
#endif
#ifndef X_OK
#define	X_OK	1		/* Test for execute permission.  */
#endif
#ifndef F_OK
#define	F_OK	0		/* Test for existence.  */
#endif

#if HAVE_FCNTL_H
#include <fcntl.h>		/* may define O_BINARY	*/
#endif

#ifndef O_BINARY
#define O_BINARY 0
#endif

#ifdef TRACE
#if USE_REENTRANT
#define COUNT_OUTCHARS(n) _nc_count_outchars(n);
#else
#define COUNT_OUTCHARS(n) _nc_outchars += (n);
#endif
#else
#define COUNT_OUTCHARS(n) /* nothing */
#endif

#define RESET_OUTCHARS() COUNT_OUTCHARS(-_nc_outchars)

#define UChar(c)	((unsigned char)(c))
#define ChCharOf(c)	((c) & (chtype)A_CHARTEXT)
#define ChAttrOf(c)	((c) & (chtype)A_ATTRIBUTES)

#ifndef MB_LEN_MAX
#define MB_LEN_MAX 8 /* should be >= MB_CUR_MAX, but that may be a function */
#endif

#if USE_WIDEC_SUPPORT /* { */
#define isEILSEQ(status) (((size_t)status == (size_t)-1) && (errno == EILSEQ))

#define init_mb(state)	memset(&state, 0, sizeof(state))

#if NCURSES_EXT_COLORS
#define NulColor	, 0
#else
#define NulColor	/* nothing */
#endif

#define NulChar		0,0,0,0	/* FIXME: see CCHARW_MAX */
#define CharOf(c)	((c).chars[0])
#define AttrOf(c)	((c).attr)

#define AddAttr(c,a)	AttrOf(c) |=  ((a) & A_ATTRIBUTES)
#define RemAttr(c,a)	AttrOf(c) &= ~((a) & A_ATTRIBUTES)
#define SetAttr(c,a)	AttrOf(c) =   ((a) & A_ATTRIBUTES) | WidecExt(c)

#define NewChar2(c,a)	{ a, { c, NulChar } NulColor }
#define NewChar(ch)	NewChar2(ChCharOf(ch), ChAttrOf(ch))

#if CCHARW_MAX == 5
#define CharEq(a,b)	(((a).attr == (b).attr) \
		       && (a).chars[0] == (b).chars[0] \
		       && (a).chars[1] == (b).chars[1] \
		       && (a).chars[2] == (b).chars[2] \
		       && (a).chars[3] == (b).chars[3] \
		       && (a).chars[4] == (b).chars[4] \
			if_EXT_COLORS(&& (a).ext_color == (b).ext_color))
#else
#define CharEq(a,b)	(!memcmp(&(a), &(b), sizeof(a)))
#endif

#define SetChar(ch,c,a) do {							    \
			    NCURSES_CH_T *_cp = &ch;				    \
			    memset(_cp, 0, sizeof(ch));				    \
			    _cp->chars[0] = (c);					    \
			    _cp->attr = (a);					    \
			    if_EXT_COLORS(SetPair(ch, PAIR_NUMBER(a)));		    \
			} while (0)
#define CHREF(wch)	(&wch)
#define CHDEREF(wch)	(*wch)
#define ARG_CH_T	NCURSES_CH_T *
#define CARG_CH_T	const NCURSES_CH_T *
#define PUTC_DATA	char PUTC_buf[MB_LEN_MAX]; int PUTC_i, PUTC_n; \
			mbstate_t PUT_st; wchar_t PUTC_ch
#define PUTC_INIT	init_mb (PUT_st)
#define PUTC(ch,b)	do { if(!isWidecExt(ch)) {				    \
			if (Charable(ch)) {					    \
			    fputc(CharOf(ch), b);				    \
			    COUNT_OUTCHARS(1);					    \
			} else {						    \
			    PUTC_INIT;						    \
			    for (PUTC_i = 0; PUTC_i < CCHARW_MAX; ++PUTC_i) {	    \
				PUTC_ch = (ch).chars[PUTC_i];			    \
				if (PUTC_ch == L'\0')				    \
				    break;					    \
				PUTC_n = wcrtomb(PUTC_buf,			    \
						 (ch).chars[PUTC_i], &PUT_st);	    \
				if (PUTC_n <= 0) {				    \
				    if (PUTC_ch && is8bits(PUTC_ch) && PUTC_i == 0) \
					putc(PUTC_ch,b);			    \
				    break;					    \
				}						    \
				fwrite(PUTC_buf, (unsigned) PUTC_n, 1, b);	    \
			    }							    \
			    COUNT_OUTCHARS(PUTC_i);				    \
			} } } while (0)

#define BLANK		NewChar2(' ', WA_NORMAL)
#define ZEROS		NewChar2('\0', WA_NORMAL)
#define ISBLANK(ch)	((ch).chars[0] == L' ' && (ch).chars[1] == L'\0')

	/*
	 * Wide characters cannot be represented in the A_CHARTEXT mask of
	 * attr_t's but an application might have set a narrow character there.
	 * But even in that case, it would only be a printable character, or
	 * zero.  Otherwise we can use those bits to tell if a cell is the
	 * first or extension part of a wide character.
	 */
#define WidecExt(ch)	(AttrOf(ch) & A_CHARTEXT)
#define isWidecBase(ch)	(WidecExt(ch) == 1)
#define isWidecExt(ch)	(WidecExt(ch) > 1 && WidecExt(ch) < 32)
#define SetWidecExt(dst, ext)	AttrOf(dst) &= ~A_CHARTEXT,		\
				AttrOf(dst) |= (ext + 1)

#define if_WIDEC(code)  code
#define Charable(ch)	((SP != 0 && SP->_legacy_coding)		\
			 || (AttrOf(ch) & A_ALTCHARSET)			\
			 || (!isWidecExt(ch) &&				\
			     (ch).chars[1] == L'\0' &&			\
			     _nc_is_charable(CharOf(ch))))

#define L(ch)		L ## ch
#else /* }{ */
#define CharOf(c)	ChCharOf(c)
#define AttrOf(c)	ChAttrOf(c)
#define AddAttr(c,a)	c |= (a)
#define RemAttr(c,a)	c &= ~((a) & A_ATTRIBUTES)
#define SetAttr(c,a)	c = ((c) & ~A_ATTRIBUTES) | (a)
#define NewChar(ch)	(ch)
#define NewChar2(c,a)	((c) | (a))
#define CharEq(a,b)	((a) == (b))
#define SetChar(ch,c,a)	ch = (c) | (a)
#define CHREF(wch)	wch
#define CHDEREF(wch)	wch
#define ARG_CH_T	NCURSES_CH_T
#define CARG_CH_T	NCURSES_CH_T
#define PUTC_DATA	int data = 0
#define PUTC(ch,b)	do { data = CharOf(ch); putc(data,b); } while (0)

#define BLANK		(' '|A_NORMAL)
#define ZEROS		('\0'|A_NORMAL)
#define ISBLANK(ch)	(CharOf(ch) == ' ')

#define isWidecExt(ch)	(0)
#define if_WIDEC(code) /* nothing */

#define L(ch)		ch
#endif /* } */

#define AttrOfD(ch)	AttrOf(CHDEREF(ch))
#define CharOfD(ch)	CharOf(CHDEREF(ch))
#define SetChar2(wch,ch)    SetChar(wch,ChCharOf(ch),ChAttrOf(ch))

#define BLANK_ATTR	A_NORMAL
#define BLANK_TEXT	L(' ')

#define CHANGED     -1

#define LEGALYX(w, y, x) \
	      ((w) != 0 && \
		((x) >= 0 && (x) <= (w)->_maxx && \
		 (y) >= 0 && (y) <= (w)->_maxy))

#define CHANGED_CELL(line,col) \
	if (line->firstchar == _NOCHANGE) \
		line->firstchar = line->lastchar = col; \
	else if ((col) < line->firstchar) \
		line->firstchar = col; \
	else if ((col) > line->lastchar) \
		line->lastchar = col

#define CHANGED_RANGE(line,start,end) \
	if (line->firstchar == _NOCHANGE \
	 || line->firstchar > (start)) \
		line->firstchar = start; \
	if (line->lastchar == _NOCHANGE \
	 || line->lastchar < (end)) \
		line->lastchar = end

#define CHANGED_TO_EOL(line,start,end) \
	if (line->firstchar == _NOCHANGE \
	 || line->firstchar > (start)) \
		line->firstchar = start; \
	line->lastchar = end

#define SIZEOF(v) (sizeof(v)/sizeof(v[0]))

#define FreeIfNeeded(p)  if ((p) != 0) free(p)

/* FreeAndNull() is not a comma-separated expression because some compilers
 * do not accept a mixture of void with values.
 */
#define FreeAndNull(p)   free(p); p = 0

#include <nc_alloc.h>

/*
 * TTY bit definition for converting tabs to spaces.
 */
#ifdef TAB3
# define OFLAGS_TABS TAB3	/* POSIX specifies TAB3 */
#else
# ifdef XTABS
#  define OFLAGS_TABS XTABS	/* XTABS is usually the "same" */
# else
#  ifdef OXTABS
#   define OFLAGS_TABS OXTABS	/* the traditional BSD equivalent */
#  else
#   define OFLAGS_TABS 0
#  endif
# endif
#endif

/*
 * Standardize/simplify common loops
 */
#define each_screen(p) p = _nc_screen_chain; p != 0; p = (p)->_next_screen
#define each_window(p) p = _nc_windows; p != 0; p = (p)->next
#define each_ripoff(p) p = ripoff_stack; (p - ripoff_stack) < N_RIPS; ++p

/*
 * Prefixes for call/return points of library function traces.  We use these to
 * instrument the public functions so that the traces can be easily transformed
 * into regression scripts.
 */
#define T_CALLED(fmt) "called {" fmt
#define T_CREATE(fmt) "create :" fmt
#define T_RETURN(fmt) "return }" fmt

#ifdef TRACE

#if USE_REENTRANT
#define TPUTS_TRACE(s)	_nc_set_tputs_trace(s);
#else
#define TPUTS_TRACE(s)	_nc_tputs_trace = s;
#endif

#define START_TRACE() \
	if ((_nc_tracing & TRACE_MAXIMUM) == 0) { \
	    int t = _nc_getenv_num("NCURSES_TRACE"); \
	    if (t >= 0) \
		trace((unsigned) t); \
	}

/*
 * Many of the _tracef() calls use static buffers; lock the trace state before
 * trying to fill them.
 */
#if USE_REENTRANT
#define USE_TRACEF(mask) _nc_use_tracef(mask)
extern NCURSES_EXPORT(int)	_nc_use_tracef (unsigned);
extern NCURSES_EXPORT(void)	_nc_locked_tracef (const char *, ...) GCC_PRINTFLIKE(1,2);
#else
#define USE_TRACEF(mask) (_nc_tracing & (mask))
#define _nc_locked_tracef _tracef
#endif

#define TR(n, a)	if (USE_TRACEF(n)) _nc_locked_tracef a
#define T(a)		TR(TRACE_CALLS, a)
#define TRACE_RETURN(value,type) return _nc_retrace_##type(value)

#define returnAttr(code)	TRACE_RETURN(code,attr_t)
#define returnBits(code)	TRACE_RETURN(code,unsigned)
#define returnBool(code)	TRACE_RETURN(code,bool)
#define returnCPtr(code)	TRACE_RETURN(code,cptr)
#define returnCVoidPtr(code)	TRACE_RETURN(code,cvoid_ptr)
#define returnChar(code)	TRACE_RETURN(code,chtype)
#define returnCode(code)	TRACE_RETURN(code,int)
#define returnPtr(code)		TRACE_RETURN(code,ptr)
#define returnSP(code)		TRACE_RETURN(code,sp)
#define returnVoid		T((T_RETURN(""))); return
#define returnVoidPtr(code)	TRACE_RETURN(code,void_ptr)
#define returnWin(code)		TRACE_RETURN(code,win)

extern NCURSES_EXPORT(NCURSES_BOOL)     _nc_retrace_bool (NCURSES_BOOL);
extern NCURSES_EXPORT(NCURSES_CONST void *) _nc_retrace_cvoid_ptr (NCURSES_CONST void *);
extern NCURSES_EXPORT(SCREEN *)         _nc_retrace_sp (SCREEN *);
extern NCURSES_EXPORT(WINDOW *)         _nc_retrace_win (WINDOW *);
extern NCURSES_EXPORT(attr_t)           _nc_retrace_attr_t (attr_t);
extern NCURSES_EXPORT(char *)           _nc_retrace_ptr (char *);
extern NCURSES_EXPORT(char *)           _nc_trace_ttymode(TTY *tty);
extern NCURSES_EXPORT(char *)           _nc_varargs (const char *, va_list);
extern NCURSES_EXPORT(chtype)           _nc_retrace_chtype (chtype);
extern NCURSES_EXPORT(const char *)     _nc_altcharset_name(attr_t, chtype);
extern NCURSES_EXPORT(const char *)     _nc_retrace_cptr (const char *);
extern NCURSES_EXPORT(int)              _nc_retrace_int (int);
extern NCURSES_EXPORT(unsigned)         _nc_retrace_unsigned (unsigned);
extern NCURSES_EXPORT(void *)           _nc_retrace_void_ptr (void *);
extern NCURSES_EXPORT(void)             _nc_fifo_dump (SCREEN *);

#if USE_REENTRANT
NCURSES_WRAPPED_VAR(long, _nc_outchars);
NCURSES_WRAPPED_VAR(const char *, _nc_tputs_trace);
#define _nc_outchars       NCURSES_PUBLIC_VAR(_nc_outchars())
#define _nc_tputs_trace    NCURSES_PUBLIC_VAR(_nc_tputs_trace())
extern NCURSES_EXPORT(void)		_nc_set_tputs_trace (const char *);
extern NCURSES_EXPORT(void)		_nc_count_outchars (long);
#else
extern NCURSES_EXPORT_VAR(const char *) _nc_tputs_trace;
extern NCURSES_EXPORT_VAR(long)         _nc_outchars;
#endif

extern NCURSES_EXPORT_VAR(unsigned)     _nc_tracing;

#if USE_WIDEC_SUPPORT
extern NCURSES_EXPORT(const char *) _nc_viswbuf2 (int, const wchar_t *);
extern NCURSES_EXPORT(const char *) _nc_viswbufn (const wchar_t *, int);
#endif

extern NCURSES_EXPORT(const char *) _nc_viscbuf2 (int, const NCURSES_CH_T *, int);
extern NCURSES_EXPORT(const char *) _nc_viscbuf (const NCURSES_CH_T *, int);

#else /* !TRACE */

#define START_TRACE() /* nothing */

#define T(a)
#define TR(n, a)
#define TPUTS_TRACE(s)

#define returnAttr(code)	return code
#define returnBits(code)	return code
#define returnBool(code)	return code
#define returnCPtr(code)	return code
#define returnCVoidPtr(code)	return code
#define returnChar(code)	return code
#define returnCode(code)	return code
#define returnPtr(code)		return code
#define returnSP(code)		return code
#define returnVoid		return
#define returnVoidPtr(code)	return code
#define returnWin(code)		return code

#endif /* TRACE/!TRACE */

/*
 * Return-codes for tgetent() and friends.
 */
#define TGETENT_YES  1		/* entry is found */
#define TGETENT_NO   0		/* entry is not found */
#define TGETENT_ERR -1		/* an error occurred */

extern NCURSES_EXPORT(const char *) _nc_visbuf2 (int, const char *);
extern NCURSES_EXPORT(const char *) _nc_visbufn (const char *, int);

#define EMPTY_MODULE(name) \
extern	NCURSES_EXPORT(void) name (void); \
	NCURSES_EXPORT(void) name (void) { }

#define ALL_BUT_COLOR ((chtype)~(A_COLOR))
#define NONBLANK_ATTR (A_NORMAL|A_BOLD|A_DIM|A_BLINK)
#define XMC_CHANGES(c) ((c) & SP->_xmc_suppress)

#define toggle_attr_on(S,at) {\
   if (PAIR_NUMBER(at) > 0) {\
      (S) = ((S) & ALL_BUT_COLOR) | (at);\
   } else {\
      (S) |= (at);\
   }\
   TR(TRACE_ATTRS, ("new attribute is %s", _traceattr((S))));}


#define toggle_attr_off(S,at) {\
   if (PAIR_NUMBER(at) > 0) {\
      (S) &= ~(at|A_COLOR);\
   } else {\
      (S) &= ~(at);\
   }\
   TR(TRACE_ATTRS, ("new attribute is %s", _traceattr((S))));}

#define DelCharCost(count) \
		((parm_dch != 0) \
		? SP->_dch_cost \
		: ((delete_character != 0) \
			? (SP->_dch1_cost * count) \
			: INFINITY))

#define InsCharCost(count) \
		((parm_ich != 0) \
		? SP->_ich_cost \
		: ((enter_insert_mode && exit_insert_mode) \
		  ? SP->_smir_cost + SP->_rmir_cost + (SP->_ip_cost * count) \
		  : ((insert_character != 0) \
		    ? ((SP->_ich1_cost + SP->_ip_cost) * count) \
		    : INFINITY)))

#if USE_XMC_SUPPORT
#define UpdateAttrs(c)	if (!SameAttrOf(SCREEN_ATTRS(SP), c)) { \
				attr_t chg = AttrOf(SCREEN_ATTRS(SP)); \
				VIDATTR(AttrOf(c), GetPair(c)); \
				if (magic_cookie_glitch > 0 \
				 && XMC_CHANGES((chg ^ AttrOf(SCREEN_ATTRS(SP))))) { \
					T(("%s @%d before glitch %d,%d", \
						__FILE__, __LINE__, \
						SP->_cursrow, \
						SP->_curscol)); \
					_nc_do_xmc_glitch(chg); \
				} \
			}
#else
#define UpdateAttrs(c)	if (!SameAttrOf(SCREEN_ATTRS(SP), c)) \
				VIDATTR(AttrOf(c), GetPair(c));
#endif

/*
 * Macros to make additional parameter to implement wgetch_events()
 */
#ifdef NCURSES_WGETCH_EVENTS
#define EVENTLIST_0th(param) param
#define EVENTLIST_1st(param) param
#define EVENTLIST_2nd(param) , param
#else
#define EVENTLIST_0th(param) void
#define EVENTLIST_1st(param) /* nothing */
#define EVENTLIST_2nd(param) /* nothing */
#endif

#if NCURSES_EXPANDED && NCURSES_EXT_FUNCS

#undef  toggle_attr_on
#define toggle_attr_on(S,at) _nc_toggle_attr_on(&(S), at)
extern NCURSES_EXPORT(void) _nc_toggle_attr_on (attr_t *, attr_t);

#undef  toggle_attr_off
#define toggle_attr_off(S,at) _nc_toggle_attr_off(&(S), at)
extern NCURSES_EXPORT(void) _nc_toggle_attr_off (attr_t *, attr_t);

#undef  DelCharCost
#define DelCharCost(count) _nc_DelCharCost(count)
extern NCURSES_EXPORT(int) _nc_DelCharCost (int);

#undef  InsCharCost
#define InsCharCost(count) _nc_InsCharCost(count)
extern NCURSES_EXPORT(int) _nc_InsCharCost (int);

#undef  UpdateAttrs
#define UpdateAttrs(c) _nc_UpdateAttrs(c)
extern NCURSES_EXPORT(void) _nc_UpdateAttrs (NCURSES_CH_T);

#else

extern NCURSES_EXPORT(void) _nc_expanded (void);

#endif

#if !NCURSES_EXT_FUNCS
#define set_escdelay(value) ESCDELAY = value
#endif

#if !HAVE_GETCWD
#define getcwd(buf,len) getwd(buf)
#endif

/* charable.c */
#if USE_WIDEC_SUPPORT
extern NCURSES_EXPORT(bool) _nc_is_charable(wchar_t);
extern NCURSES_EXPORT(int) _nc_to_char(wint_t);
extern NCURSES_EXPORT(wint_t) _nc_to_widechar(int);
#endif

/* comp_captab.c */
typedef struct {
	short	nte_name;	/* offset of name to hash on */
	int	nte_type;	/* BOOLEAN, NUMBER or STRING */
	short	nte_index;	/* index of associated variable in its array */
	short	nte_link;	/* index in table of next hash, or -1 */
} name_table_data;

typedef struct
{
	short	from;
	short	to;
	short	source;
} alias_table_data;

/* doupdate.c */
#if USE_XMC_SUPPORT
extern NCURSES_EXPORT(void) _nc_do_xmc_glitch (attr_t);
#endif

/* hardscroll.c */
#if defined(TRACE) || defined(SCROLLDEBUG) || defined(HASHDEBUG)
extern NCURSES_EXPORT(void) _nc_linedump (void);
#endif

/* lib_acs.c */
extern NCURSES_EXPORT(void) _nc_init_acs (void);	/* corresponds to traditional 'init_acs()' */
extern NCURSES_EXPORT(int) _nc_msec_cost (const char *const, int);  /* used by 'tack' program */

/* lib_addch.c */
#if USE_WIDEC_SUPPORT
NCURSES_EXPORT(int) _nc_build_wch(WINDOW *win, ARG_CH_T ch);
#endif

/* lib_addstr.c */
#if USE_WIDEC_SUPPORT && !defined(USE_TERMLIB)
extern NCURSES_EXPORT(int) _nc_wchstrlen(const cchar_t *);
#endif

/* lib_color.c */
extern NCURSES_EXPORT(bool) _nc_reset_colors(void);

/* lib_getch.c */
extern NCURSES_EXPORT(int) _nc_wgetch(WINDOW *, unsigned long *, int EVENTLIST_2nd(_nc_eventlist *));

/* lib_insch.c */
extern NCURSES_EXPORT(int) _nc_insert_ch(WINDOW *, chtype);

/* lib_mvcur.c */
#define INFINITY	1000000	/* cost: too high to use */

extern NCURSES_EXPORT(void) _nc_mvcur_init (void);
extern NCURSES_EXPORT(void) _nc_mvcur_resume (void);
extern NCURSES_EXPORT(void) _nc_mvcur_wrap (void);

extern NCURSES_EXPORT(int) _nc_scrolln (int, int, int, int);

extern NCURSES_EXPORT(void) _nc_screen_init (void);
extern NCURSES_EXPORT(void) _nc_screen_resume (void);
extern NCURSES_EXPORT(void) _nc_screen_wrap (void);

/* lib_mouse.c */
extern NCURSES_EXPORT(int) _nc_has_mouse (void);

/* lib_mvcur.c */
#define INFINITY	1000000	/* cost: too high to use */
#define BAUDBYTE	9	/* 9 = 7 bits + 1 parity + 1 stop */

/* lib_setup.c */
extern NCURSES_EXPORT(char *) _nc_get_locale(void);
extern NCURSES_EXPORT(int) _nc_unicode_locale(void);
extern NCURSES_EXPORT(int) _nc_locale_breaks_acs(TERMINAL *);
extern NCURSES_EXPORT(int) _nc_setupterm(NCURSES_CONST char *, int, int *, bool);
extern NCURSES_EXPORT(void) _nc_get_screensize(SCREEN *, int *, int *);

/* lib_tstp.c */
#if USE_SIGWINCH
extern NCURSES_EXPORT(int) _nc_handle_sigwinch(SCREEN *);
#else
#define _nc_handle_sigwinch(a) /* nothing */
#endif

/* lib_ungetch.c */
extern NCURSES_EXPORT(int) _nc_ungetch (SCREEN *, int);

/* lib_wacs.c */
#if USE_WIDEC_SUPPORT
extern NCURSES_EXPORT(void) _nc_init_wacs(void);
#endif

typedef struct {
    char *s_head;	/* beginning of the string (may be null) */
    char *s_tail;	/* end of the string (may be null) */
    size_t s_size;	/* current remaining size available */
    size_t s_init;	/* total size available */
} string_desc;

/* strings.c */
extern NCURSES_EXPORT(string_desc *) _nc_str_init (string_desc *, char *, size_t);
extern NCURSES_EXPORT(string_desc *) _nc_str_null (string_desc *, size_t);
extern NCURSES_EXPORT(string_desc *) _nc_str_copy (string_desc *, string_desc *);
extern NCURSES_EXPORT(bool) _nc_safe_strcat (string_desc *, const char *);
extern NCURSES_EXPORT(bool) _nc_safe_strcpy (string_desc *, const char *);

#if !HAVE_STRSTR
#define strstr _nc_strstr
extern NCURSES_EXPORT(char *) _nc_strstr (const char *, const char *);
#endif

/* safe_sprintf.c */
extern NCURSES_EXPORT(char *) _nc_printf_string (const char *, va_list);

/* tries.c */
extern NCURSES_EXPORT(int) _nc_add_to_try (TRIES **, const char *, unsigned);
extern NCURSES_EXPORT(char *) _nc_expand_try (TRIES *, unsigned, int *, size_t);
extern NCURSES_EXPORT(int) _nc_remove_key (TRIES **, unsigned);
extern NCURSES_EXPORT(int) _nc_remove_string (TRIES **, const char *);

/* elsewhere ... */
extern NCURSES_EXPORT(ENTRY *) _nc_delink_entry (ENTRY *, TERMTYPE *);
extern NCURSES_EXPORT(NCURSES_CONST char *) _nc_keyname (SCREEN *, int);
extern NCURSES_EXPORT(NCURSES_CONST char *) _nc_unctrl (SCREEN *, chtype);
extern NCURSES_EXPORT(SCREEN *) _nc_screen_of (WINDOW *);
extern NCURSES_EXPORT(WINDOW *) _nc_makenew (int, int, int, int, int);
extern NCURSES_EXPORT(char *) _nc_trace_buf (int, size_t);
extern NCURSES_EXPORT(char *) _nc_trace_bufcat (int, const char *);
extern NCURSES_EXPORT(char *) _nc_tracechar (SCREEN *, int);
extern NCURSES_EXPORT(char *) _nc_tracemouse (SCREEN *, MEVENT const *);
extern NCURSES_EXPORT(int) _nc_access (const char *, int);
extern NCURSES_EXPORT(int) _nc_baudrate (int);
extern NCURSES_EXPORT(int) _nc_freewin (WINDOW *);
extern NCURSES_EXPORT(int) _nc_getenv_num (const char *);
extern NCURSES_EXPORT(int) _nc_keypad (SCREEN *, bool);
extern NCURSES_EXPORT(int) _nc_ospeed (int);
extern NCURSES_EXPORT(int) _nc_outch (int);
extern NCURSES_EXPORT(int) _nc_read_termcap_entry (const char *const, TERMTYPE *const);
extern NCURSES_EXPORT(int) _nc_setupscreen (int, int, FILE *, bool, int);
extern NCURSES_EXPORT(int) _nc_timed_wait (SCREEN *, int, int, int * EVENTLIST_2nd(_nc_eventlist *));
extern NCURSES_EXPORT(void) _nc_do_color (short, short, bool, int (*)(int));
extern NCURSES_EXPORT(void) _nc_flush (void);
extern NCURSES_EXPORT(void) _nc_free_and_exit (int);
extern NCURSES_EXPORT(void) _nc_free_entry (ENTRY *, TERMTYPE *);
extern NCURSES_EXPORT(void) _nc_freeall (void);
extern NCURSES_EXPORT(void) _nc_hash_map (void);
extern NCURSES_EXPORT(void) _nc_init_keytry (SCREEN *);
extern NCURSES_EXPORT(void) _nc_keep_tic_dir (const char *);
extern NCURSES_EXPORT(void) _nc_make_oldhash (int i);
extern NCURSES_EXPORT(void) _nc_scroll_oldhash (int n, int top, int bot);
extern NCURSES_EXPORT(void) _nc_scroll_optimize (void);
extern NCURSES_EXPORT(void) _nc_set_buffer (FILE *, bool);
extern NCURSES_EXPORT(void) _nc_signal_handler (bool);
extern NCURSES_EXPORT(void) _nc_synchook (WINDOW *);
extern NCURSES_EXPORT(void) _nc_trace_tries (TRIES *);

#if NO_LEAKS
extern NCURSES_EXPORT(void) _nc_alloc_entry_leaks(void);
extern NCURSES_EXPORT(void) _nc_captoinfo_leaks(void);
extern NCURSES_EXPORT(void) _nc_codes_leaks(void);
extern NCURSES_EXPORT(void) _nc_comp_captab_leaks(void);
extern NCURSES_EXPORT(void) _nc_comp_scan_leaks(void);
extern NCURSES_EXPORT(void) _nc_keyname_leaks(void);
extern NCURSES_EXPORT(void) _nc_names_leaks(void);
extern NCURSES_EXPORT(void) _nc_tgetent_leaks(void);
#endif

#ifndef USE_TERMLIB
extern NCURSES_EXPORT(NCURSES_CH_T) _nc_render (WINDOW *, NCURSES_CH_T);
extern NCURSES_EXPORT(int) _nc_waddch_nosync (WINDOW *, const NCURSES_CH_T);
extern NCURSES_EXPORT(void) _nc_scroll_window (WINDOW *, int const, NCURSES_SIZE_T const, NCURSES_SIZE_T const, NCURSES_CH_T);
#endif

#if USE_WIDEC_SUPPORT && !defined(USE_TERMLIB)
extern NCURSES_EXPORT(size_t) _nc_wcrtomb (char *, wchar_t, mbstate_t *);
#endif

#if USE_SIZECHANGE
extern NCURSES_EXPORT(void) _nc_update_screensize (SCREEN *);
#endif

#if HAVE_RESIZETERM
extern NCURSES_EXPORT(void) _nc_resize_margins (WINDOW *);
#else
#define _nc_resize_margins(wp) /* nothing */
#endif

#ifdef NCURSES_WGETCH_EVENTS
extern NCURSES_EXPORT(int) _nc_eventlist_timeout(_nc_eventlist *);
#else
#define wgetch_events(win, evl) wgetch(win)
#define wgetnstr_events(win, str, maxlen, evl) wgetnstr(win, str, maxlen)
#endif

/*
 * Not everyone has vsscanf(), but we'd like to use it for scanw().
 */
#if !HAVE_VSSCANF
extern int vsscanf(const char *str, const char *format, va_list __arg);
#endif

/* scroll indices */
extern NCURSES_EXPORT_VAR(int *) _nc_oldnums;

#define USE_SETBUF_0 0

#define NC_BUFFERED(flag) _nc_set_buffer(SP->_ofp, flag)

#define NC_OUTPUT ((SP != 0) ? SP->_ofp : stdout)

/*
 * On systems with a broken linker, define 'SP' as a function to force the
 * linker to pull in the data-only module with 'SP'.
 */
#if BROKEN_LINKER
#define SP _nc_screen()
extern NCURSES_EXPORT(SCREEN *) _nc_screen (void);
extern NCURSES_EXPORT(int) _nc_alloc_screen (void);
extern NCURSES_EXPORT(void) _nc_set_screen (SCREEN *);
#else
/* current screen is private data; avoid possible linking conflicts too */
extern NCURSES_EXPORT_VAR(SCREEN *) SP;
#define _nc_alloc_screen() ((SP = typeCalloc(SCREEN, 1)) != 0)
#define _nc_set_screen(sp) SP = sp
#endif

/*
 * We don't want to use the lines or columns capabilities internally, because
 * if the application is running multiple screens under X, it's quite possible
 * they could all have type xterm but have different sizes!  So...
 */
#define screen_lines	SP->_lines
#define screen_columns	SP->_columns

extern NCURSES_EXPORT(int) _nc_slk_initialize (WINDOW *, int);

/*
 * Some constants related to SLK's
 */
#define MAX_SKEY_OLD	   8	/* count of soft keys */
#define MAX_SKEY_LEN_OLD   8	/* max length of soft key text */
#define MAX_SKEY_PC       12    /* This is what most PC's have */
#define MAX_SKEY_LEN_PC    5

/* Macro to check whether or not we use a standard format */
#define SLK_STDFMT(fmt) (fmt < 3)
/* Macro to determine height of label window */
#define SLK_LINES(fmt)  (SLK_STDFMT(fmt) ? 1 : ((fmt) - 2))

#define MAX_SKEY(fmt)     (SLK_STDFMT(fmt)? MAX_SKEY_OLD : MAX_SKEY_PC)
#define MAX_SKEY_LEN(fmt) (SLK_STDFMT(fmt)? MAX_SKEY_LEN_OLD : MAX_SKEY_LEN_PC)

extern NCURSES_EXPORT(int) _nc_ripoffline (int line, int (*init)(WINDOW *,int));

/*
 * Common error messages
 */
#define MSG_NO_MEMORY "Out of memory"
#define MSG_NO_INPUTS "Premature EOF"

#ifdef __cplusplus
}
#endif

#endif /* CURSES_PRIV_H */