/****************************************************************************
 * Copyright (c) 1998 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>                         *
 ****************************************************************************/


/*
 * $Id: curses.priv.h,v 1.2 1998/08/05 15:08:08 xtang 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	__WATCOMC__ > 1000
#pragma	pack(__push,1);
#else
#pragma	pack(1);
#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

#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

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

#include <errno.h>

#if DECL_ERRNO
extern int errno;
#endif

#include <nc_panel.h>

/* Some systems have a broken 'select()', but workable 'poll()'.  Use that */
#if HAVE_POLL && HAVE_SYS_STROPTS_H && HAVE_POLL_H
#define USE_FUNC_POLL 1
#else
#define USE_FUNC_POLL 0
#endif

/* 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

#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.
 */
#ifndef NCURSES_EXT_FUNCS
#undef HAVE_SIZECHANGE
#endif

#if HAVE_SIZECHANGE
#define USE_SIZECHANGE 1
#else
#undef USE_SIGWINCH
#endif

/*
 * As currently coded, hashmap relies on the scroll-hints logic.
 */
#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.
 */

struct tries {
	struct tries    *child;     /* ptr to child.  NULL if none          */
	struct 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.   */
};

/*
 * Definitions for color pairs
 */
#define C_SHIFT 8		/* 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))

/*
 * Structure for palette tables
 */

typedef struct
{
    short red, green, blue;
}
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

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

#if	defined(__QNX__) && !defined(__QNXNTO__)
#include	<sys/kernel.h>
#include	<sys/mouse.h>

/* internal KEY_MOUSE value for M_QNX_TERM mouse */
#define		KEY_MOUSE_SUB1	(KEY_MAX - 1)
#define		KEY_MOUSE_SUB2	(KEY_MAX - 2)
#define		KEY_MOUSE_SUB3	(KEY_MAX - 3)
#endif

/*
 * Structure for soft labels.
 */

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

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

struct screen {
	int             _ifd;           /* input file ptr for screen        */
	FILE            *_ofp;          /* output file ptr for screen       */
	char            *_setbuf;       /* buffered I/O for output          */
	int             _checkfd;       /* filedesc for typeahead check     */
	struct term     *_term;         /* terminal type information        */
	short           _lines;         /* screen lines                     */
	short           _columns;       /* screen columns                   */
	short           _lines_avail;   /* lines available for stdscr       */
	short           _topstolen;     /* lines stolen from top            */

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

	struct tries    *_keytry;       /* "Try" for use with keypad mode   */
	struct tries    *_key_ok;       /* Disabled keys via keyok(,FALSE)  */
	int             _tried;         /* keypad mode was initialized      */

	unsigned 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?       */
	unsigned long   _current_attr;  /* terminal attribute current set   */
	int             _coloron;       /* is color enabled?                */
	int             _cursor;        /* visibility of the cursor         */
	int             _cursrow;       /* physical cursor row              */
	int             _curscol;       /* physical cursor column           */
	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?                */
	SLK             *_slk;          /* ptr to soft key struct / NULL    */

	/* cursor movement costs; units are 10ths of milliseconds */
	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 lib_doupdate.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)         */
	/* used in lib_mvcur.c */
	char *          _address_cursor;
	int             _carriage_return_length;
	int             _cursor_home_length;
	int             _cursor_to_ll_length;
	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        */
	unsigned short  *_color_pairs;  /* screen's color pair list          */
	int             _pair_count;    /* count of color pairs              */
	int             _default_color; /* use default colors                */
	chtype          _xmc_suppress;  /* attributes to suppress if xmc     */
	chtype          _xmc_triggers;  /* attributes to process if xmc      */
	chtype          _acs_map[ACS_LEN];

	/*
	 * 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.
	 */
	int             _maxclick;
	bool            (*_mouse_event) (SCREEN *);
	bool            (*_mouse_inline)(SCREEN *);
	bool            (*_mouse_parse) (int);
	void            (*_mouse_resume)(SCREEN *);
	void            (*_mouse_wrap)  (SCREEN *);
	int             _mouse_fd;      /* file-descriptor, if any */

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

        /*
	 * These are data that support the proper handling of the panel stack on an
	 * per screen basis.
	 */
        struct panelhook _panelHook;
	/*
	 * Linked-list of all windows, to support '_nc_resizeall()' and
	 * '_nc_freeall()'
	 */
	WINDOWLIST      *_nc_sp_windows;
#define _nc_windows SP->_nc_sp_windows

	bool            _sig_winch;
	SCREEN          *_next_screen;

#if	defined(__QNX__) && !defined(__QNXNTO__)
	/*
	 * These are QNX porting extension
	 */
	pid_t	_qnx_kbd_proxy;
	pid_t	_qnx_kbd_vproxy;
	pid_t	_qnx_mouse_proxy;
	int		_qnx_mouse_armed;
	struct	_mouse_ctrl	* _qnx_mouse_ctrl;
	pid_t	_qnx_timer_proxy;
	timer_t	_qnx_timer;
	void	(* _qnx_user_callback)(pid_t pid);
	int		_qnx_term_mouse_subkey;
#endif

};

extern SCREEN *_nc_screen_chain;

#ifdef NCURSES_NOMACROS
#include <nomacros.h>
#endif

	WINDOWLIST {
	WINDOWLIST *next;
	WINDOW	*win;
};

typedef	struct {
	int	line;                   /* lines to take, < 0 => from bottom*/
	int	(*hook)(struct _win_st *, int); /* callback for user        */
	struct _win_st *w;              /* maybe we need this for cleanup   */
} ripoff_t;

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

#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 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

#define TextOf(c)    ((c) & (chtype)A_CHARTEXT)
#define AttrOf(c)    ((c) & (chtype)A_ATTRIBUTES)

#define BLANK        (' '|A_NORMAL)

#define CHANGED     -1

#define SIZEOF(v) (sizeof(v)/sizeof(v[0]))
#define typeCalloc(type,elts) (type *)calloc(elts,sizeof(type))
#define FreeIfNeeded(p)  if(p != 0) free(p)
#define FreeAndNull(p)   free(p); p = 0

#include <nc_alloc.h>

/*
 * 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
#define TR(n, a)	if (_nc_tracing & (n)) _tracef a
#define T(a)		TR(TRACE_CALLS, a)
#define TPUTS_TRACE(s)	_nc_tputs_trace = s;
#define TRACE_RETURN(value,type) return _nc_retrace_##type(value)
#define returnAttr(code) TRACE_RETURN(code,attr_t)
#define returnCode(code) TRACE_RETURN(code,int)
#define returnPtr(code)  TRACE_RETURN(code,ptr)
#define returnVoid       T((T_RETURN(""))); return
#define returnWin(code)  TRACE_RETURN(code,win)
extern unsigned _nc_tracing;
extern WINDOW * _nc_retrace_win(WINDOW *);
extern attr_t _nc_retrace_attr_t(attr_t);
extern char *_nc_retrace_ptr(char *);
extern const char *_nc_tputs_trace;
extern int _nc_retrace_int(int);
extern long _nc_outchars;
extern void _nc_fifo_dump(void);
#else
#define T(a)
#define TR(n, a)
#define TPUTS_TRACE(s)
#define returnAttr(code) return code
#define returnCode(code) return code
#define returnPtr(code)  return code
#define returnVoid       return
#define returnWin(code)  return code
#endif

extern const char *_nc_visbuf(const char *);
extern const char *_nc_visbuf2(int, const char *);

#define _trace_key(ch) ((ch > KEY_MIN) ? keyname(ch) : _tracechar((unsigned char)ch))

#define ALL_BUT_COLOR ((chtype)~(A_COLOR))
#define IGNORE_COLOR_OFF FALSE
#define NONBLANK_ATTR (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);\
   T(("new attribute is %s", _traceattr((S))))


#define toggle_attr_off(S,at) \
   if (IGNORE_COLOR_OFF == TRUE) {\
      if (PAIR_NUMBER(at) == 0xff) /* turn off color */\
	 (S) &= ~(at);\
      else /* leave color alone */\
	 (S) &= ~((at)&ALL_BUT_COLOR);\
   } else {\
      if (PAIR_NUMBER(at) > 0x00) /* turn off color */\
	 (S) &= ~(at|A_COLOR);\
      else /* leave color alone */\
	 (S) &= ~(at);\
   }\
   T(("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 \
		: ((insert_character != 0) \
			? (SP->_ich1_cost * count) \
			: INFINITY))

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

/*
 * Check whether the given character can be output by clearing commands.  This
 * includes test for being a space and not including any 'bad' attributes, such
 * as A_REVERSE.  All attribute flags which don't affect appearance of a space
 * or can be output by clearing (A_COLOR in case of bce-terminal) are excluded.
 */
#define can_clear_with(ch) \
	((ch & ~(NONBLANK_ATTR|(back_color_erase ? A_COLOR:0))) == BLANK)

#ifdef NCURSES_EXPANDED

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

#undef  can_clear_with
#define can_clear_with(ch) _nc_can_clear_with(ch)
extern int _nc_can_clear_with(chtype);

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

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

#undef  UpdateAttrs
#define UpdateAttrs(c) _nc_UpdateAttrs(c)
extern void _nc_UpdateAttrs(chtype);

#else

extern void _nc_expanded(void);

#endif

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

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

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

/* lib_acs.c */
extern void init_acs(void);	/* no prefix, this name is traditional */
extern int _nc_msec_cost(const char *const, int);  /* used by 'tack' program */

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

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

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

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

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

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

/* softscroll.c */
extern void _nc_setup_scroll(void);
extern void _nc_perform_scroll(void);

/* tries.c */
extern void _nc_add_to_try(struct tries **tree, char *str, unsigned short code);
extern char *_nc_expand_try(struct tries *tree, unsigned short code, size_t len);
extern int _nc_remove_key(struct tries **tree, unsigned short code);

/* elsewhere ... */
extern WINDOW *_nc_makenew(int, int, int, int, int);
extern char *_nc_trace_buf(int, size_t);
extern chtype _nc_background(WINDOW *);
extern chtype _nc_render(WINDOW *, chtype);
extern int _nc_keypad(bool);
extern int _nc_outch(int);
extern int _nc_setupscreen(short, short const, FILE *);
extern int _nc_timed_wait(int, int, int *);
extern int _nc_waddch_nosync(WINDOW *, const chtype);
extern void _nc_do_color(int, bool, int (*)(int));
extern void _nc_free_and_exit(int);
extern void _nc_freeall(void);
extern void _nc_freewin(WINDOW *win);
extern void _nc_hash_map(void);
extern void _nc_outstr(const char *str);
extern void _nc_scroll_optimize(void);
extern void _nc_scroll_window(WINDOW *, int const, short const, short const, chtype);
extern void _nc_set_buffer(FILE *ofp, bool buffered);
extern void _nc_signal_handler(bool);
extern void _nc_synchook(WINDOW *win);

#if USE_SIZECHANGE
extern void _nc_update_screensize(void);
#endif

/*
 * On systems with a broken linker, define 'SP' as a function to force the
 * linker to pull in the data-only module with 'SP'.
 */
#ifndef BROKEN_LINKER
#define BROKEN_LINKER 0
#endif

#if BROKEN_LINKER
#define SP _nc_screen()
extern SCREEN *_nc_screen(void);
extern int _nc_alloc_screen(void);
extern void _nc_set_screen(SCREEN *);
#else
/* current screen is private data; avoid possible linking conflicts too */
extern 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 windows, 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 int _nc_slk_format;  /* != 0 if slk_init() called */
extern 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

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

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

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

#ifdef __cplusplus
}
#endif

#endif /* CURSES_PRIV_H */
