/* -*- C -*-
 * $Id$
 *
 * ext/curses/curses.c
 *
 * by MAEDA Shugo (ender@pic-internet.or.jp)
 * modified by Yukihiro Matsumoto (matz@netlab.co.jp),
 *         Toki Yoshinori,
 *         Hitoshi Takahashi,
 *         and Takaaki Tateishi (ttate@kt.jaist.ac.jp)
 *
 * maintainers:
 * - Takaaki Tateishi (ttate@kt.jaist.ac.jp)
 *
 * documentation:
 * - Vincent Batts (vbatts@hashbangbash.com)
 */

#include "ruby.h"
#include "ruby/io.h"
#include "ruby/thread.h"

#if defined(HAVE_PDCURSES_H)
# include <pdcurses.h>
#elif defined(HAVE_NCURSESW_CURSES_H)
# include <ncursesw/curses.h>
#elif defined(HAVE_NCURSES_CURSES_H)
# include <ncurses/curses.h>
#elif defined(HAVE_NCURSES_H)
# include <ncurses.h>
#elif defined(HAVE_CURSES_COLR_CURSES_H)
# ifdef HAVE_STDARG_PROTOTYPES
#  include <stdarg.h>
# else
#  include <varargs.h>
# endif
# include <curses_colr/curses.h>
#else
# include <curses.h>
# if defined(__bsdi__) || defined(__NetBSD__) || defined(__APPLE__)
#  if !defined(_maxx)
#  define _maxx maxx
#  endif
#  if !defined(_maxy)
#  define _maxy maxy
#  endif
#  if !defined(_begx)
#  define _begx begx
#  endif
#  if !defined(_begy)
#  define _begy begy
#  endif
# endif
#endif

#if defined(HAVE_NCURSESW_MENU_H)
# include <ncursesw/menu.h>
#elif defined(HAVE_NCURSES_MENU_H)
# include <ncurses/menu.h>
#elif defined(HAVE_CURSES_MENU_H)
# include <curses/menu.h>
#elif defined(HAVE_MENU_H)
# include <menu.h>
#endif

#if defined(HAVE_NCURSESW_FORM_H)
# include <ncursesw/form.h>
#elif defined(HAVE_NCURSES_FORM_H)
# include <ncurses/form.h>
#elif defined(HAVE_CURSES_FORM_H)
# include <curses/form.h>
#elif defined(HAVE_FORM_H)
# include <form.h>
#endif

#ifdef HAVE_INIT_COLOR
# define USE_COLOR 1
#endif

/* supports only ncurses mouse routines */
#ifdef NCURSES_MOUSE_VERSION
# define USE_MOUSE 1
#endif

#define OBJ2CHTYPE rb_obj2chtype_inline

static inline chtype
rb_obj2chtype_inline(VALUE x)
{
    if (RB_TYPE_P(x, RUBY_T_STRING)) {
	ID id_ord;

	CONST_ID(id_ord, "ord");
	x = rb_funcall(x, id_ord, 0);
    }
    return NUM2CHTYPE(x);
}

static VALUE mCurses;
static VALUE mKey;
#ifdef HAVE_NEWTERM
static VALUE cScreen;
#endif
static VALUE cWindow;
#ifdef HAVE_NEWPAD
static VALUE cPad;
#endif
#ifdef USE_MOUSE
static VALUE cMouseEvent;
#endif
#ifdef HAVE_MENU
static VALUE cItem;
static VALUE cMenu;
#endif
#ifdef HAVE_FORM
static VALUE cField;
static VALUE cForm;
#endif
static VALUE eError;
static VALUE eSystemError;
static VALUE eBadArgumentError;
static VALUE ePostedError;
static VALUE eConnectedError;
static VALUE eBadStateError;
static VALUE eNoRoomError;
static VALUE eNotPostedError;
static VALUE eUnknownCommandError;
static VALUE eNoMatchError;
static VALUE eNotSelectableError;
static VALUE eNotConnectedError;
static VALUE eRequestDeniedError;
static VALUE eInvalidFieldError;
static VALUE eCurrentError;

static VALUE rb_stdscr;

static rb_encoding *keyboard_encoding;
static rb_encoding *terminal_encoding;

#ifndef E_OK
#define E_OK 0
#endif

static void
check_curses_error(int error)
{
    switch (error) {
    case E_OK:
	break;
#ifdef E_SYSTEM_ERROR
    case E_SYSTEM_ERROR:
	rb_raise(eSystemError, "A system error occurred");
	break;
#endif
#ifdef E_BAD_ARGUMENT
    case E_BAD_ARGUMENT:
	rb_raise(eBadArgumentError, "Incorrect or out-of-range argument");
	break;
#endif
#ifdef E_POSTED
    case E_POSTED:
	rb_raise(ePostedError, "The menu has already been posted");
	break;
#endif
#ifdef E_CONNECTED
    case E_CONNECTED:
	rb_raise(eConnectedError, "The field is already connected to a form");
	break;
#endif
#ifdef E_BAD_STATE
    case E_BAD_STATE:
	rb_raise(eBadStateError, "Called from an initialization or termination function");
	break;
#endif
#ifdef E_NO_ROOM
    case E_NO_ROOM:
	rb_raise(eNoRoomError, "Form is too large for its window");
	break;
#endif
#ifdef E_NOT_POSTED
    case E_NOT_POSTED:
	rb_raise(eNotPostedError, "The menu has not been posted");
	break;
#endif
#ifdef E_UNKNOWN_COMMAND
    case E_UNKNOWN_COMMAND:
	rb_raise(eUnknownCommandError, "Unknown command");
	break;
#endif
#ifdef E_NO_MATCH
    case E_NO_MATCH:
	rb_raise(eNoMatchError, "Character failed to match");
	break;
#endif
#ifdef E_NOT_SELECTABLE
    case E_NOT_SELECTABLE:
	rb_raise(eNotSelectableError, "The designated item cannot be selected");
	break;
#endif
#ifdef E_NOT_CONNECTED
    case E_NOT_CONNECTED:
	rb_raise(eNotConnectedError, "No fields or items are connected");
	break;
#endif
#ifdef E_REQUEST_DENIED
    case E_REQUEST_DENIED:
	rb_raise(eRequestDeniedError, "The request could not be processed");
	break;
#endif
#ifdef E_INVALID_FIELD
    case E_INVALID_FIELD:
	rb_raise(eInvalidFieldError, "Contents of a field is not valid");
	break;
#endif
#ifdef E_CURRENT
    case E_CURRENT:
	rb_raise(eCurrentError, "The field is the current field");
	break;
#endif
    default:
	rb_raise(eError, "Unknown error");
	break;
    }
}

struct windata {
    WINDOW *window;
    int is_stdscr;
};

static VALUE window_attroff(VALUE obj, VALUE attrs);
static VALUE window_attron(VALUE obj, VALUE attrs);
static VALUE window_attrset(VALUE obj, VALUE attrs);

NORETURN(static void no_window(void));
static void
no_window(void)
{
    rb_raise(rb_eRuntimeError, "already closed window");
}

#define GetWINDOW(obj, winp) do {\
    TypedData_Get_Struct((obj), struct windata, &windata_type, (winp));\
    if ((winp)->window == 0) no_window();\
} while (0)

static void
window_free(void *p)
{
    struct windata *winp = p;
    if (winp->window && !winp->is_stdscr) delwin(winp->window);
    winp->window = 0;
    xfree(winp);
}

static size_t
window_memsize(const void *p)
{
    const struct windata *winp = p;
    size_t size = sizeof(*winp);
    if (!winp) return 0;
    if (winp->window && winp->window != stdscr) size += CURSES_SIZEOF_WINDOW;
    return size;
}

static const rb_data_type_t windata_type = {
    "windata",
    {0, window_free, window_memsize,}
};

static VALUE
prep_window(VALUE class, WINDOW *window, int is_stdscr)
{
    VALUE obj;
    struct windata *winp;

    if (window == NULL) {
	rb_raise(rb_eRuntimeError, "failed to create window");
    }

    obj = rb_obj_alloc(class);
    TypedData_Get_Struct(obj, struct windata, &windata_type, winp);
    winp->window = window;
    winp->is_stdscr = is_stdscr;

    return obj;
}

#if (defined(HAVE_ADDNWSTR) || defined(HAVE_WADDNWSTR)) && defined(_WIN32)
static inline rb_encoding *
get_wide_encoding(void)
{
    static rb_encoding *utf16le = NULL;
    if (!utf16le) {
	utf16le = rb_enc_find("utf-16le");
    }
    return utf16le;
}
#endif

/*-------------------------- module Curses --------------------------*/

static void curses_finalize(VALUE);
/*
 * Document-method: Curses.init_screen
 *
 * Initialize a standard screen
 *
 * see also Curses.stdscr
 */
static VALUE
curses_init_screen(VALUE self)
{
    if (rb_stdscr) return rb_stdscr;
    initscr();
    if (stdscr == 0) {
	rb_raise(rb_eRuntimeError, "can't initialize curses");
    }
    rb_set_end_proc(curses_finalize, 0);
    clear();
    rb_stdscr = prep_window(cWindow, stdscr, 1);
    return rb_stdscr;
}

/*
 * Document-method: Curses.stdscr
 *
 * The Standard Screen.
 *
 * Upon initializing curses, a default window called stdscr,
 * which is the size of the terminal screen, is created.
 *
 * Many curses functions use this window.
 */
#define curses_stdscr() curses_init_screen(Qnil)

/*
 * Document-method: Curses.close_screen
 *
 * A program should always call Curses.close_screen before exiting or
 * escaping from curses mode temporarily. This routine
 * restores tty modes, moves the cursor to the lower
 * left-hand corner of the screen and resets the terminal
 * into the proper non-visual mode.
 *
 * Calling Curses.refresh or Curses.doupdate after a temporary
 * escape causes the program to resume visual mode.
 *
 */
static VALUE
curses_close_screen(VALUE self)
{
    curses_stdscr();
#ifdef HAVE_ISENDWIN
    if (!isendwin())
#endif
	endwin();
    rb_stdscr = 0;
    return Qnil;
}

/*
 * This is no runtime method,
 * but a function called before the proc ends
 *
 * Similar to Curses.close_screen, except that it also
 * garbage collects/unregisters the Curses.stdscr
 */
static void
curses_finalize(VALUE dummy)
{
    if (stdscr
#ifdef HAVE_ISENDWIN
	&& !isendwin()
#endif
	)
	endwin();
    rb_stdscr = 0;
    rb_gc_unregister_address(&rb_stdscr);
}

#ifdef HAVE_ISENDWIN
/*
 * Document-method: Curses.closed?
 *
 * Returns +true+ if the window/screen has been closed,
 * without any subsequent Curses.refresh calls,
 * returns +false+ otherwise.
 */
static VALUE
curses_closed(VALUE self)
{
    curses_stdscr();
    if (isendwin()) {
	return Qtrue;
    }
    return Qfalse;
}
#else
#define curses_closed rb_f_notimplement
#endif

/*
 * Document-method: Curses.clear
 *
 * Clears every position on the screen completely,
 * so that a subsequent call by Curses.refresh for the screen/window
 * will be repainted from scratch.
 */
static VALUE
curses_clear(VALUE obj)
{
    curses_stdscr();
    wclear(stdscr);
    return Qnil;
}

#ifdef HAVE_WERASE
/*
 * Document-method: Curses.erase
 *
 * Erase the screen.
 */
static VALUE
curses_erase(VALUE obj)
{
    curses_stdscr();
    werase(stdscr);
    return Qnil;
}
#else
#define curses_erase rb_f_notimplement
#endif

/*
 * Document-method: Curses.clrtoeol
 *
 * Clears to the end of line, that the cursor is currently on.
 */
static VALUE
curses_clrtoeol(VALUE self)
{
    curses_stdscr();
    clrtoeol();
    return Qnil;
}

/*
 * Document-method: Curses.refresh
 *
 * Refreshes the windows and lines.
 *
 */
static VALUE
curses_refresh(VALUE obj)
{
    curses_stdscr();
    refresh();
    return Qnil;
}

/*
 * Document-method: Curses.doupdate
 *
 * Refreshes the windows and lines.
 *
 * Curses.doupdate allows multiple updates with
 * more efficiency than Curses.refresh alone.
 */
static VALUE
curses_doupdate(VALUE obj)
{
    curses_stdscr();
#ifdef HAVE_DOUPDATE
    doupdate();
#else
    refresh();
#endif
    return Qnil;
}

/*
 * Document-method: Curses.echo
 *
 * Enables characters typed by the user
 * to be echoed by Curses.getch as they are typed.
 */
static VALUE
curses_echo(VALUE obj)
{
    curses_stdscr();
    echo();
    return Qnil;
}

/*
 * Document-method: Curses.noecho
 *
 * Disables characters typed by the user
 * to be echoed by Curses.getch as they are typed.
 */
static VALUE
curses_noecho(VALUE obj)
{
    curses_stdscr();
    noecho();
    return Qnil;
}

/*
 * Document-method: Curses.raw
 *
 * Put the terminal into raw mode.
 *
 * Raw mode is similar to Curses.cbreak mode, in that characters typed
 * are immediately passed through to the user program.
 *
 * The differences are that in raw mode, the interrupt, quit,
 * suspend, and flow control characters are all passed through
 * uninterpreted, instead of generating a signal. The behavior
 * of the BREAK key depends on other bits in the tty driver
 * that are not set by curses.
 */
static VALUE
curses_raw(VALUE obj)
{
    curses_stdscr();
    raw();
    return Qnil;
}

/*
 * Document-method: Curses.noraw
 *
 * Put the terminal out of raw mode.
 *
 * see Curses.raw for more detail
 */
static VALUE
curses_noraw(VALUE obj)
{
    curses_stdscr();
    noraw();
    return Qnil;
}

/*
 * Document-method: Curses.cbreak
 *
 * Put the terminal into cbreak mode.
 *
 * Normally, the tty driver buffers typed characters until
 * a newline or carriage return is typed. The Curses.cbreak
 * routine disables line buffering and erase/kill
 * character-processing (interrupt and flow control characters
 * are unaffected), making characters typed by the user
 * immediately available to the program.
 *
 * The Curses.nocbreak routine returns the terminal to normal (cooked) mode.
 *
 * Initially the terminal may or may not be in cbreak mode,
 * as the mode is inherited; therefore, a program should
 * call Curses.cbreak or Curses.nocbreak explicitly.
 * Most interactive programs using curses set the cbreak mode.
 * Note that Curses.cbreak overrides Curses.raw.
 *
 * see also Curses.raw
 */
static VALUE
curses_cbreak(VALUE obj)
{
    curses_stdscr();
    cbreak();
    return Qnil;
}

/*
 * Document-method: Curses.nocbreak
 *
 * Put the terminal into normal mode (out of cbreak mode).
 *
 * See Curses.cbreak for more detail.
 */
static VALUE
curses_nocbreak(VALUE obj)
{
    curses_stdscr();
    nocbreak();
    return Qnil;
}

/*
 * Document-method: Curses.nl
 *
 * Enable the underlying display device to translate
 * the return key into newline on input, and whether it
 * translates newline into return and line-feed on output
 * (in either case, the call Curses.addch('\n') does the
 * equivalent of return and line feed on the virtual screen).
 *
 * Initially, these translations do occur. If you disable
 * them using Curses.nonl, curses will be able to make better use
 * of the line-feed capability, resulting in faster cursor
 * motion. Also, curses will then be able to detect the return key.
 */
static VALUE
curses_nl(VALUE obj)
{
    curses_stdscr();
    nl();
    return Qnil;
}

/*
 * Document-method: Curses.nl
 *
 * Disable the underlying display device to translate
 * the return key into newline on input
 *
 * See Curses.nl for more detail
 */
static VALUE
curses_nonl(VALUE obj)
{
    curses_stdscr();
    nonl();
    return Qnil;
}

/*
 * Document-method: Curses.flushinp
 *
 * The flushinp routine throws away any typeahead that has been
 * typed by the user and has not yet been read by the program.
 */
static VALUE
curses_flushinp(VALUE obj)
{
    curses_stdscr();
    flushinp();
    return Qnil;
}

/*
 * Document-method: Curses.beep
 *
 * Sounds an audible alarm on the terminal, if possible;
 * otherwise it flashes the screen (visual bell).
 *
 * see also Curses.flash
 */
static VALUE
curses_beep(VALUE obj)
{
#ifdef HAVE_BEEP
    curses_stdscr();
    beep();
#endif
    return Qnil;
}

/*
 * Document-method: Curses.flash
 *
 * Flashes the screen, for visual alarm on the terminal, if possible;
 * otherwise it sounds the alert.
 *
 * see also Curses.beep
 */
static VALUE
curses_flash(VALUE obj)
{
#ifdef HAVE_FLASH
    curses_stdscr();
    flash();
#endif
    return Qnil;
}

static int
curses_char(VALUE c)
{
    if (FIXNUM_P(c)) {
	return NUM2INT(c);
    }
    else {
	int cc;

	StringValue(c);
	if (RSTRING_LEN(c) == 0 || RSTRING_LEN(c) > 1) {
	    rb_raise(rb_eArgError, "string not corresponding a character");
	}
	cc = RSTRING_PTR(c)[0];
	if (cc > 0x7f) {
	    rb_raise(rb_eArgError, "no multibyte string supported (yet)");
	}
	return cc;
    }
}

#ifdef HAVE_UNGETCH
/*
 * Document-method: Curses.ungetch
 * call-seq: ungetch(ch)
 *
 * Places +ch+ back onto the input queue to be returned by
 * the next call to Curses.getch.
 *
 * There is just one input queue for all windows.
 */
static VALUE
curses_ungetch(VALUE obj, VALUE ch)
{
    int c = curses_char(ch);
    curses_stdscr();
    ungetch(c);
    return Qnil;
}
#else
#define curses_ungetch rb_f_notimplement
#endif

/*
 * Document-method: Curses.setpos
 * call-seq: setpos(y, x)
 *
 * A setter for the position of the cursor,
 * using coordinates +x+ and +y+
 *
 */
static VALUE
curses_setpos(VALUE obj, VALUE y, VALUE x)
{
    curses_stdscr();
    move(NUM2INT(y), NUM2INT(x));
    return Qnil;
}

/*
 * Document-method: Curses.standout
 *
 * Enables the best highlighting mode of the terminal.
 *
 * This is equivalent to Curses:Window.attron(A_STANDOUT)
 *
 * see also Curses::Window.attrset additional information
 */
static VALUE
curses_standout(VALUE obj)
{
    curses_stdscr();
    standout();
    return Qnil;
}

/*
 * Document-method: Curses.standend
 *
 * Enables the Normal display (no highlight)
 *
 * This is equivalent to Curses.attron(A_NORMAL)
 *
 * see also Curses::Window.attrset for additional information.
 */
static VALUE
curses_standend(VALUE obj)
{
    curses_stdscr();
    standend();
    return Qnil;
}

/*
 * Document-method: Curses.inch
 *
 * Returns the character at the current position.
 */
static VALUE
curses_inch(VALUE obj)
{
    curses_stdscr();
    return CHTYPE2NUM(inch());
}

/*
 * Document-method: Curses.addch
 * call-seq: addch(ch)
 *
 * Add a character +ch+, with attributes, then advance the cursor.
 *
 * see also the system manual for curs_addch(3)
 */
static VALUE
curses_addch(VALUE obj, VALUE ch)
{
    curses_stdscr();
    addch(OBJ2CHTYPE(ch));
    return Qnil;
}

/*
 * Document-method: Curses.insch
 * call-seq: insch(ch)
 *
 * Insert a character +ch+, before the cursor.
 *
 */
static VALUE
curses_insch(VALUE obj, VALUE ch)
{
    curses_stdscr();
    insch(OBJ2CHTYPE(ch));
    return Qnil;
}

/*
 * Document-method: Curses.addstr
 * call-seq: addstr(str)
 *
 * add a string of characters +str+, to the window and advance cursor
 *
 */
static VALUE
curses_addstr(VALUE obj, VALUE str)
{
    StringValue(str);
#if defined(HAVE_ADDNWSTR) && defined(_WIN32)
    str = rb_str_export_to_enc(str, get_wide_encoding());
    curses_stdscr();
    if (!NIL_P(str)) {
	addnwstr((wchar_t *)RSTRING_PTR(str), RSTRING_LEN(str) / sizeof(wchar_t));
    }
#else
    str = rb_str_export_to_enc(str, terminal_encoding);
    curses_stdscr();
    if (!NIL_P(str)) {
	addstr(StringValueCStr(str));
    }
#endif
    return Qnil;
}

static void *
getch_func(void *arg)
{
    int *ip = (int *)arg;
    *ip = getch();
    return 0;
}

/*
 * Document-method: Curses.getch
 *
 * Read and returns a character from the window.
 *
 * See Curses::Key to all the function KEY_* available
 *
 */
static VALUE
curses_getch(VALUE obj)
{
    int c;

    curses_stdscr();
    rb_thread_call_without_gvl(getch_func, &c, RUBY_UBF_IO, 0);
    if (c == EOF) return Qnil;
    if (rb_isprint(c)) {
	char ch = (char)c;

	return rb_external_str_new_with_enc(&ch, 1, keyboard_encoding);
    }
    return UINT2NUM(c);
}

/* This should be big enough.. I hope */
#define GETSTR_BUF_SIZE 1024

static void *
getstr_func(void *arg)
{
    char *rtn = (char *)arg;
#if defined(HAVE_GETNSTR)
    getnstr(rtn,GETSTR_BUF_SIZE-1);
#else
    getstr(rtn);
#endif
    return 0;
}

/*
 * Document-method: Curses.getstr
 *
 * This is equivalent to a series of Curses::Window.getch calls
 *
 */
static VALUE
curses_getstr(VALUE obj)
{
    char rtn[GETSTR_BUF_SIZE];

    curses_stdscr();
    rb_thread_call_without_gvl(getstr_func, rtn, RUBY_UBF_IO, 0);
    return rb_external_str_new_with_enc(rtn, strlen(rtn), keyboard_encoding);
}

/*
 * Document-method: Curses.delch
 *
 * Delete the character under the cursor
 *
 */
static VALUE
curses_delch(VALUE obj)
{
    curses_stdscr();
    delch();
    return Qnil;
}

/*
 * Document-method: Curses.deleteln
 *
 * Delete the line under the cursor.
 *
 */
static VALUE
curses_deleteln(VALUE obj)
{
    curses_stdscr();
#if defined(HAVE_DELETELN) || defined(deleteln)
    deleteln();
#endif
    return Qnil;
}

/*
 * Document-method: Curses.insertln
 *
 * Inserts a line above the cursor, and the bottom line is lost
 *
 */
static VALUE
curses_insertln(VALUE obj)
{
    curses_stdscr();
#if defined(HAVE_INSERTLN) || defined(insertln)
    insertln();
#endif
    return Qnil;
}

/*
 * Document-method: Curses.keyname
 * call-seq: keyname(c)
 *
 * Returns the character string corresponding to key +c+
 */
static VALUE
curses_keyname(VALUE obj, VALUE c)
{
#ifdef HAVE_KEYNAME
    int cc = curses_char(c);
    const char *name;

    curses_stdscr();
    name = keyname(cc);
    if (name) {
	return rb_str_new_cstr(name);
    }
    else {
	return Qnil;
    }
#else
    return Qnil;
#endif
}

/*
 * Document-method: Curses.lines
 *
 * Returns the number of lines on the screen
 */
static VALUE
curses_lines(VALUE self)
{
    return INT2FIX(LINES);
}

/*
 * Document-method: Curses.cols
 *
 * Returns the number of columns on the screen
 */
static VALUE
curses_cols(VALUE self)
{
    return INT2FIX(COLS);
}

/*
 * Document-method: Curses.curs_set
 * call-seq: curs_set(visibility)
 *
 * Sets Cursor Visibility.
 * 0: invisible
 * 1: visible
 * 2: very visible
 */
static VALUE
curses_curs_set(VALUE obj, VALUE visibility)
{
#ifdef HAVE_CURS_SET
    int n;
    curses_stdscr();
    return (n = curs_set(NUM2INT(visibility)) != ERR) ? INT2FIX(n) : Qnil;
#else
    return Qnil;
#endif
}

/*
 * Document-method: Curses.scrl
 * call-seq: scrl(num)
 *
 * Scrolls the current window Fixnum +num+ lines.
 * The current cursor position is not changed.
 *
 * For positive +num+, it scrolls up.
 *
 * For negative +num+, it scrolls down.
 *
 */
static VALUE
curses_scrl(VALUE obj, VALUE n)
{
    /* may have to raise exception on ERR */
#ifdef HAVE_SCRL
    curses_stdscr();
    return (scrl(NUM2INT(n)) == OK) ? Qtrue : Qfalse;
#else
    return Qfalse;
#endif
}

/*
 * Document-method: Curses.setscrreg
 *
 * call-seq:
 *   setscrreg(top, bottom)
 *
 * Set a software scrolling region in a window.
 * +top+ and +bottom+ are lines numbers of the margin.
 *
 * If this option and Curses.scrollok are enabled, an attempt to move off
 * the bottom margin line causes all lines in the scrolling region
 * to scroll one line in the direction of the first line.
 * Only the text of the window is scrolled.
 *
 */
static VALUE
curses_setscrreg(VALUE obj, VALUE top, VALUE bottom)
{
    /* may have to raise exception on ERR */
#ifdef HAVE_SETSCRREG
    curses_stdscr();
    return (setscrreg(NUM2INT(top), NUM2INT(bottom)) == OK) ? Qtrue : Qfalse;
#else
    return Qfalse;
#endif
}

/*
 * Document-method: Curses.attroff
 * call-seq: attroff(attrs)
 *
 * Turns off the named attributes +attrs+
 * without affecting any others.
 *
 * See also Curses::Window.attrset for additional information.
 */
static VALUE
curses_attroff(VALUE obj, VALUE attrs)
{
    curses_stdscr();
    return window_attroff(rb_stdscr,attrs);
    /* return INT2FIX(attroff(NUM2INT(attrs))); */
}

/*
 * Document-method: Curses.attron
 * call-seq: attron(attrs)
 *
 * Turns on the named attributes +attrs+
 * without turning any other attributes on or off.
 *
 * See also Curses::Window.attrset for additional information.
 */
static VALUE
curses_attron(VALUE obj, VALUE attrs)
{
    curses_stdscr();
    return window_attron(rb_stdscr,attrs);
    /* return INT2FIX(attroff(NUM2INT(attrs))); */
}

/*
 * Document-method: Curses.attrset
 * call-seq: attrset(attrs)
 *
 * Sets the current attributes of the given window to +attrs+.
 *
 * see also Curses::Window.attrset
 *
 */
static VALUE
curses_attrset(VALUE obj, VALUE attrs)
{
    curses_stdscr();
    return window_attrset(rb_stdscr,attrs);
    /* return INT2FIX(attroff(NUM2INT(attrs))); */
}

/*
 * Document-method: Curses.bkgdset
 * call-seq: bkgdset(ch)
 *
 * Manipulate the background of the named window
 * with character Integer +ch+
 *
 * The background becomes a property of the character
 * and moves with the character through any scrolling
 * and insert/delete line/character operations.
 *
 * see also the system manual for curs_bkgd(3)
 */
static VALUE
curses_bkgdset(VALUE obj, VALUE ch)
{
#ifdef HAVE_BKGDSET
    curses_stdscr();
    bkgdset(OBJ2CHTYPE(ch));
#endif
    return Qnil;
}

/*
 * call-seq: bkgd(ch)
 *
 * Window background manipulation routines.
 *
 * Set the background property of the current
 * and then apply the character Integer +ch+ setting
 * to every character position in that window.
 *
 * see also the system manual for curs_bkgd(3)
 */
static VALUE
curses_bkgd(VALUE obj, VALUE ch)
{
#ifdef HAVE_BKGD
    curses_stdscr();
    return (bkgd(OBJ2CHTYPE(ch)) == OK) ? Qtrue : Qfalse;
#else
    return Qfalse;
#endif
}

#if defined(HAVE_USE_DEFAULT_COLORS)
/*
 * tells the curses library to use terminal's default colors.
 *
 * see also the system manual for default_colors(3)
 */
static VALUE
curses_use_default_colors(VALUE obj)
{
    curses_stdscr();
    use_default_colors();
    return Qnil;
}
#else
#define curses_use_default_colors rb_f_notimplement
#endif

#if defined(HAVE_ASSUME_DEFAULT_COLORS)
/*
 * tells which colors to paint for color pair 0.
 *
 * see also the system manual for default_colors(3)
 */
static VALUE
curses_assume_default_colors(VALUE obj, VALUE fg, VALUE bg)
{
    curses_stdscr();
    assume_default_colors(NUM2INT(fg), NUM2INT(bg));
    return Qnil;
}
#else
#define curses_assume_default_colors rb_f_notimplement
#endif

#if defined(HAVE_TABSIZE)
/*
 * Document-method: Curses.TABSIZE=
 * call-seq: TABSIZE=(value)
 *
 * Sets the TABSIZE to Integer +value+
 */
static VALUE
curses_tabsize_set(VALUE obj, VALUE val)
{
    TABSIZE = NUM2INT(val);
    return INT2NUM(TABSIZE);
}
#else
#define curses_tabsize_set rb_f_notimplement
#endif

#if defined(HAVE_TABSIZE)
/*
 * Returns the number of positions in a tab.
 */
static VALUE
curses_tabsize_get(VALUE ojb)
{
    return INT2NUM(TABSIZE);
}
#else
#define curses_tabsize_get rb_f_notimplement
#endif

#if defined(HAVE_ESCDELAY)
/*
 * call-seq: Curses.ESCDELAY=(value)
 *
 * Sets the ESCDELAY to Integer +value+
 */
static VALUE
curses_escdelay_set(VALUE obj, VALUE val)
{
    ESCDELAY = NUM2INT(val);
    return INT2NUM(ESCDELAY);
}
#else
#define curses_escdelay_set rb_f_notimplement
#endif

#if defined(HAVE_ESCDELAY)
/*
 * Returns the total time, in milliseconds, for which
 * curses will await a character sequence, e.g., a function key
 */
static VALUE
curses_escdelay_get(VALUE obj)
{
    return INT2NUM(ESCDELAY);
}
#else
#define curses_escdelay_get rb_f_notimplement
#endif

/*
 * Document-method: Curses.resize
 * call-seq: resize(lines, cols)
 *
 * alias for Curses.resizeterm
 *
 */

/*
 * Document-method: Curses.resizeterm
 * call-seq: resizeterm(lines, cols)
 *
 * Resize the current term to Fixnum +lines+ and Fixnum +cols+
 *
 */
static VALUE
curses_resizeterm(VALUE obj, VALUE lin, VALUE col)
{
#if defined(HAVE_RESIZETERM)
    curses_stdscr();
    return (resizeterm(NUM2INT(lin),NUM2INT(col)) == OK) ? Qtrue : Qfalse;
#else
    return Qnil;
#endif
}

#ifdef USE_COLOR
/*
 * Document-method: Curses.start_color
 *
 * Initializes the color attributes, for terminals that support it.
 *
 * This must be called, in order to use color attributes.
 * It is good practice to call it just after Curses.init_screen
 */
static VALUE
curses_start_color(VALUE obj)
{
    /* may have to raise exception on ERR */
    curses_stdscr();
    return (start_color() == OK) ? Qtrue : Qfalse;
}

/*
 * Document-method: Curses.init_pair
 * call-seq: init_pair(pair, f, b)
 *
 * Changes the definition of a color-pair.
 *
 * It takes three arguments: the number of the color-pair to be changed +pair+,
 * the foreground color number +f+, and the background color number +b+.
 *
 * If the color-pair was previously initialized, the screen is
 * refreshed and all occurrences of that color-pair are changed
 * to the new definition.
 *
 */
static VALUE
curses_init_pair(VALUE obj, VALUE pair, VALUE f, VALUE b)
{
    /* may have to raise exception on ERR */
    curses_stdscr();
#ifdef HAVE_INIT_EXTENDED_PAIR
    return (init_extended_pair(NUM2INT(pair), NUM2INT(f), NUM2INT(b)) == OK) ? Qtrue : Qfalse;
#else
    return (init_pair(NUM2INT(pair),NUM2INT(f),NUM2INT(b)) == OK) ? Qtrue : Qfalse;
#endif
}

/*
 * Document-method: Curses.init_color
 * call-seq: init_color(color, r, g, b)
 *
 * Changes the definition of a color. It takes four arguments:
 * * the number of the color to be changed, +color+
 * * the amount of red, +r+
 * * the amount of green, +g+
 * * the amount of blue, +b+
 *
 * The value of the first argument must be between 0 and  COLORS.
 * (See the section Colors for the default color index.)  Each
 * of the last three arguments must be a value between 0 and 1000.
 * When Curses.init_color is used, all occurrences of that color
 * on the screen immediately change to the new definition.
 */
static VALUE
curses_init_color(VALUE obj, VALUE color, VALUE r, VALUE g, VALUE b)
{
    /* may have to raise exception on ERR */
    curses_stdscr();
#ifdef HAVE_INIT_EXTENDED_COLOR
    return (init_extended_color(NUM2INT(color), NUM2INT(r),
				NUM2INT(g), NUM2INT(b)) == OK) ? Qtrue : Qfalse;
#else
    return (init_color(NUM2INT(color),NUM2INT(r),
		       NUM2INT(g),NUM2INT(b)) == OK) ? Qtrue : Qfalse;
#endif
}

/*
 * Document-method: Curses.has_colors?
 *
 * Returns +true+ or +false+ depending on whether the terminal has color capabilities.
 */
static VALUE
curses_has_colors(VALUE obj)
{
    curses_stdscr();
    return has_colors() ? Qtrue : Qfalse;
}

/*
 * Document-method: Curses.can_change_color?
 *
 * Returns +true+ or +false+ depending on whether the terminal can change color attributes
 */
static VALUE
curses_can_change_color(VALUE obj)
{
    curses_stdscr();
    return can_change_color() ? Qtrue : Qfalse;
}

#if defined(HAVE_COLORS) || defined(COLORS)
/*
 * Document-method: Curses.colors
 *
 * returns COLORS
 */
static VALUE
curses_colors(VALUE obj)
{
    return INT2FIX(COLORS);
}
#else
#define curses_colors rb_f_notimplement
#endif

/*
 * Document-method: Curses.color_content
 * call-seq: color_content(color)
 *
 * Returns an 3 item Array of the RGB values in +color+
 */
static VALUE
curses_color_content(VALUE obj, VALUE color)
{
    curses_stdscr();
#ifdef HAVE_EXTENDED_COLOR_CONTENT
    {
	int r, g, b;
	if (extended_color_content(NUM2INT(color), &r, &g, &b) == ERR)
	    return Qnil;
	return rb_ary_new3(3, INT2FIX(r), INT2FIX(g), INT2FIX(b));
    }
#else
    {
	short r, g, b;
	if (color_content(NUM2INT(color), &r, &g, &b) == ERR)
	    return Qnil;
	return rb_ary_new3(3, INT2FIX(r), INT2FIX(g), INT2FIX(b));
    }
#endif
}


#if defined(HAVE_COLOR_PAIRS) || defined(COLOR_PAIRS)
/*
 * Document-method: Curses.color_pairs
 *
 * Returns the COLOR_PAIRS available, if the curses library supports it.
 */
static VALUE
curses_color_pairs(VALUE obj)
{
    return INT2FIX(COLOR_PAIRS);
}
#else
#define curses_color_pairs rb_f_notimplement
#endif

/*
 * Document-method: Curses.pair_content
 * call-seq: pair_content(pair)
 *
 * Returns a 2 item Array, with the foreground and
 * background color, in +pair+
 */
static VALUE
curses_pair_content(VALUE obj, VALUE pair)
{
    curses_stdscr();
#ifdef HAVE_EXTENDED_PAIR_CONTENT
    {
	int f, b;
	if (extended_pair_content(NUM2INT(pair), &f, &b) == ERR)
	    return Qnil;
	return rb_ary_new3(2, INT2FIX(f), INT2FIX(b));
    }
#else
    {
	short f, b;
	if (pair_content(NUM2INT(pair), &f, &b) == ERR)
	    return Qnil;
	return rb_ary_new3(2, INT2FIX(f), INT2FIX(b));
    }
#endif
}

/*
 * Document-method: Curses.color_pair
 * call-seq: color_pair(attrs)
 *
 * Sets the color pair attributes to +attrs+.
 *
 * This should be equivalent to Curses.attrset(COLOR_PAIR(+attrs+))
 *
 * TODO: validate that equivalency
 */
static VALUE
curses_color_pair(VALUE obj, VALUE attrs)
{
    return CHTYPE2NUM(COLOR_PAIR(NUM2CHTYPE(attrs)));
}

/*
 * Document-method: Curses.pair_number
 * call-seq: pair_number(attrs)
 *
 * Returns the Fixnum color pair number of attributes +attrs+.
 */
static VALUE
curses_pair_number(VALUE obj, VALUE attrs)
{
    curses_stdscr();
    return INT2FIX(PAIR_NUMBER(NUM2CHTYPE(attrs)));
}

/*
 * Document-method: Curses.support_extended_colors?
 *
 * Returns +true+ if the ncurses library was compiled with extended color
 * support (i.e., init_extended_pair, init_extended_color, etc. are available),
 * +false+ otherwise.
 */
static VALUE
curses_support_extended_colors(VALUE obj)
{
#if defined(HAVE_INIT_EXTENDED_PAIR) && defined(HAVE_INIT_EXTENDED_COLOR) && \
    defined(HAVE_EXTENDED_COLOR_CONTENT) && defined(HAVE_EXTENDED_PAIR_CONTENT)
    return Qtrue;
#else
    return Qfalse;
#endif
}

/*
 * Document-method: Curses.reset_color_pairs
 *
 * Resets all color pairs to undefined. Requires ncurses 6.1+.
 */
#ifdef HAVE_RESET_COLOR_PAIRS
static VALUE
curses_reset_color_pairs(VALUE obj)
{
    curses_stdscr();
    reset_color_pairs();
    return Qnil;
}
#else
#define curses_reset_color_pairs rb_f_notimplement
#endif
#endif /* USE_COLOR */

#ifdef USE_MOUSE
struct mousedata {
    MEVENT *mevent;
};

NORETURN(static void no_mevent(void));
static void
no_mevent(void)
{
    rb_raise(rb_eRuntimeError, "no such mouse event");
}

#define GetMOUSE(obj, data) do {\
    TypedData_Get_Struct((obj), struct mousedata, &mousedata_type, (data));\
    if ((data)->mevent == 0) no_mevent();\
} while (0)

static void
curses_mousedata_free(void *p)
{
    struct mousedata *mdata = p;
    if (mdata->mevent)
	xfree(mdata->mevent);
}

static size_t
curses_mousedata_memsize(const void *p)
{
    const struct mousedata *mdata = p;
    size_t size = sizeof(*mdata);
    if (!mdata) return 0;
    if (mdata->mevent) size += CURSES_SIZEOF_MEVENT;
    return size;
}

static const rb_data_type_t mousedata_type = {
    "mousedata",
    {0, curses_mousedata_free, curses_mousedata_memsize,}
};

/*
 * Document-method: Curses.getmouse
 *
 * Returns coordinates of the mouse.
 *
 * This will read and pop the mouse event data off the queue
 *
 * See the BUTTON*, ALL_MOUSE_EVENTS and REPORT_MOUSE_POSITION constants, to examine the mask of the event
 */
static VALUE
curses_getmouse(VALUE obj)
{
    struct mousedata *mdata;
    VALUE val;

    curses_stdscr();
    val = TypedData_Make_Struct(cMouseEvent,struct mousedata,
				&mousedata_type,mdata);
    mdata->mevent = (MEVENT*)xmalloc(sizeof(MEVENT));
    return (getmouse(mdata->mevent) == OK) ? val : Qnil;
}

/*
 * Document-method: Curses.ungetmouse
 *
 * It pushes a KEY_MOUSE event onto the input queue, and associates with that
 * event the given state data and screen-relative character-cell coordinates.
 *
 * The Curses.ungetmouse function behaves analogously to Curses.ungetch.
 */
static VALUE
curses_ungetmouse(VALUE obj, VALUE mevent)
{
    struct mousedata *mdata;

    curses_stdscr();
    GetMOUSE(mevent,mdata);
    return (ungetmouse(mdata->mevent) == OK) ? Qtrue : Qfalse;
}

/*
 * Document-method: Curses.mouseinterval
 * call-seq: mouseinterval(interval)
 *
 * The Curses.mouseinterval function sets the maximum time
 * (in thousands of a second) that can elapse between press
 * and release events for them to be recognized as a click.
 *
 * Use Curses.mouseinterval(0) to disable click resolution.
 * This function returns the previous interval value.
 *
 * Use Curses.mouseinterval(-1) to obtain the interval without
 * altering it.
 *
 * The default is one sixth of a second.
 */
static VALUE
curses_mouseinterval(VALUE obj, VALUE interval)
{
    curses_stdscr();
    return mouseinterval(NUM2INT(interval)) ? Qtrue : Qfalse;
}

/*
 * Document-method: Curses.mousemask
 * call-seq: mousemask(mask)
 *
 * Returns the +mask+ of the reportable events
 */
static VALUE
curses_mousemask(VALUE obj, VALUE mask)
{
    curses_stdscr();
    return ULONG2NUM(mousemask(NUM2UINT(mask),NULL));
}

#define DEFINE_MOUSE_GET_MEMBER(func_name,mem) \
static VALUE func_name (VALUE mouse) \
{ \
    struct mousedata *mdata; \
    GetMOUSE(mouse, mdata); \
    return (UINT2NUM(mdata->mevent -> mem)); \
}

/*
 * Document-method: Curses::MouseEvent.eid
 *
 * Returns the current mouse id
 */
DEFINE_MOUSE_GET_MEMBER(curs_mouse_id, id)
/*
 * Document-method: Curses::MouseEvent.x
 *
 * Returns the current mouse's X coordinate
 */
DEFINE_MOUSE_GET_MEMBER(curs_mouse_x, x)
/*
 * Document-method: Curses::MouseEvent.y
 *
 * Returns the current mouse's Y coordinate
 */
DEFINE_MOUSE_GET_MEMBER(curs_mouse_y, y)
/*
 * Document-method: Curses::MouseEvent.z
 *
 * Returns the current mouse's Z coordinate
 */
DEFINE_MOUSE_GET_MEMBER(curs_mouse_z, z)
/*
 * Document-method: Curses::MouseEvent.bstate
 *
 * Returns the current mouse's button state.  Use this with the button state
 * constants to determine which buttons were pressed.
 */
static VALUE curs_mouse_bstate(VALUE mouse)
{
    struct mousedata *mdata;
    GetMOUSE(mouse, mdata);
    return ULONG2NUM(mdata->mevent->bstate);
}
#undef define_curs_mouse_member
#endif /* USE_MOUSE */

#ifdef HAVE_TIMEOUT
/*
 * Document-method: Curses.timeout=
 * call-seq: timeout=(delay)
 *
 * Sets block and non-blocking reads for the window.
 * - If delay is negative, blocking read is used (i.e., waits indefinitely for input).
 * - If delay is zero, then non-blocking read is used (i.e., read returns ERR if no input is waiting).
 * - If delay is positive, then read blocks for delay milliseconds, and returns ERR if there is still no input.
 *
 */
static VALUE
curses_timeout(VALUE obj, VALUE delay)
{
    curses_stdscr();
    timeout(NUM2INT(delay));
    return Qnil;
}
#else
#define curses_timeout rb_f_notimplement
#endif

#ifdef HAVE_DEF_PROG_MODE
/*
 * Document-method: Curses.def_prog_mode
 *
 * Save the current terminal modes as the "program"
 * state for use by the Curses.reset_prog_mode
 *
 * This is done automatically by Curses.init_screen
 */
static VALUE
curses_def_prog_mode(VALUE obj)
{
    curses_stdscr();
    return def_prog_mode() == OK ? Qtrue : Qfalse;
}
#else
#define curses_def_prog_mode rb_f_notimplement
#endif

#ifdef HAVE_RESET_PROG_MODE
/*
 * Document-method: Curses.reset_prog_mode
 *
 * Reset the current terminal modes to the saved state
 * by the Curses.def_prog_mode
 *
 * This is done automatically by Curses.close_screen
 */
static VALUE
curses_reset_prog_mode(VALUE obj)
{
    curses_stdscr();
    return reset_prog_mode() == OK ? Qtrue : Qfalse;
}
#else
#define curses_reset_prog_mode rb_f_notimplement
#endif

/*-------------------------- class Screen --------------------------*/

#ifdef HAVE_NEWTERM

struct screendata {
    SCREEN *screen;
    VALUE stdscr_value;
};

NORETURN(static void no_screen(void));
static void
no_screen(void)
{
    rb_raise(rb_eRuntimeError, "no screen");
}

#define GetSCREEN(obj, screenp) do {\
    TypedData_Get_Struct((obj), struct screendata, &screendata_type, (screenp));\
    if ((screenp)->screen == 0) no_screen();\
} while (0)

static void
screen_gc_mark(void *p)
{
    struct screendata *screenp = p;

    rb_gc_mark(screenp->stdscr_value);
}    

static void
screen_free(void *p)
{
    struct screendata *screenp = p;
    if (screenp->screen) delscreen(screenp->screen);
    screenp->screen = 0;
    xfree(screenp);
}

static size_t
screen_memsize(const void *p)
{
    const struct screendata *screenp = p;
    size_t size = sizeof(*screenp);
    if (!screenp) return 0;
    if (screenp->screen) size += CURSES_SIZEOF_SCREEN;
    return size;
}

static const rb_data_type_t screendata_type = {
    "screendata",
    {screen_gc_mark, screen_free, screen_memsize,}
};

/* returns a Curses::Screen object */
static VALUE
screen_s_allocate(VALUE class)
{
    struct screendata *screenp;

    return TypedData_Make_Struct(class, struct screendata, &screendata_type, screenp);
}

/*
 * Document-method: Curses::Screen.new
 * call-seq: new(outf, inf, type=nil)
 *
 * Construct a new Curses::Screen.
 */
static VALUE
screen_initialize(int argc, VALUE *argv, VALUE obj)
{
    VALUE outf, inf, type;
    struct screendata *screenp;
    rb_io_t *outfptr, *infptr;

    rb_scan_args(argc, argv, "21", &outf, &inf, &type);
    TypedData_Get_Struct(obj, struct screendata, &screendata_type, screenp);
    if (screenp->screen) delscreen(screenp->screen);
    Check_Type(outf, T_FILE);
    RB_IO_POINTER(outf, outfptr);
    rb_io_check_writable(outfptr);
    Check_Type(inf, T_FILE);
    RB_IO_POINTER(inf, infptr);
    rb_io_check_readable(infptr);
    screenp->screen = newterm(NIL_P(type) ? NULL : StringValueCStr(type),
                              rb_io_stdio_file(outfptr),
                              rb_io_stdio_file(infptr));
    screenp->stdscr_value = Qnil;

    return obj;
}

/*
 * Document-method: Curses::Screen.set_term
 * call-seq: set_term
 *
 * Set the current terminal.
 */
static VALUE
screen_set_term(VALUE obj)
{
    struct screendata *screenp;

    GetSCREEN(obj, screenp);
    set_term(screenp->screen);
    if (NIL_P(screenp->stdscr_value)) {
        screenp->stdscr_value = prep_window(cWindow, stdscr, 1);
    }
    rb_stdscr = screenp->stdscr_value;

    return Qnil;
}

#endif /* HAVE_NEWTERM */

/*-------------------------- class Window --------------------------*/

/* returns a Curses::Window object */
static VALUE
window_s_allocate(VALUE class)
{
    struct windata *winp;

    return TypedData_Make_Struct(class, struct windata, &windata_type, winp);
}

/*
 * Document-method: Curses::Window.new
 * call-seq: new(height, width, top, left)
 *
 * Construct a new Curses::Window with constraints of
 * +height+ lines, +width+ columns, begin at +top+ line, and begin +left+ most column.
 *
 * A new window using full screen is called as
 * 	Curses::Window.new(0,0,0,0)
 *
 */
static VALUE
window_initialize(VALUE obj, VALUE h, VALUE w, VALUE top, VALUE left)
{
    struct windata *winp;
    WINDOW *window;

    curses_init_screen(Qnil);
    TypedData_Get_Struct(obj, struct windata, &windata_type, winp);
    if (winp->window) delwin(winp->window);
    window = newwin(NUM2INT(h), NUM2INT(w), NUM2INT(top), NUM2INT(left));
    wclear(window);
    winp->window = window;

    return obj;
}

/*
 * Document-method: Curses::Window.subwin
 * call-seq: subwin(height, width, top, left)
 *
 * Construct a new subwindow with constraints of
 * +height+ lines, +width+ columns, begin at +top+ line, and begin +left+ most column.
 *
 */
static VALUE
window_subwin(VALUE obj, VALUE height, VALUE width, VALUE top, VALUE left)
{
    struct windata *winp;
    WINDOW *window;
    VALUE win;
    int h, w, t, l;

    h = NUM2INT(height);
    w = NUM2INT(width);
    t = NUM2INT(top);
    l = NUM2INT(left);
    GetWINDOW(obj, winp);
    window = subwin(winp->window, h, w, t, l);
    win = prep_window(rb_obj_class(obj), window, 0);

    return win;
}

#ifdef HAVE_DERWIN
/*
 * Document-method: Curses::Window.derwin
 * call-seq: derwin(height, width, relative_top, relative_left)
 *
 * Construct a new subwindow with constraints of
 * +height+ lines, +width+ columns, begin at +top+ line, and begin +left+ most column
 * relative to the parent window.
 *
 */
static VALUE
window_derwin(VALUE obj, VALUE height, VALUE width, VALUE top, VALUE left)
{
    struct windata *winp;
    WINDOW *window;
    VALUE win;
    int h, w, t, l;

    h = NUM2INT(height);
    w = NUM2INT(width);
    t = NUM2INT(top);
    l = NUM2INT(left);
    GetWINDOW(obj, winp);
    window = derwin(winp->window, h, w, t, l);
    win = prep_window(rb_obj_class(obj), window, 0);

    return win;
}
#else
#define window_derwin rb_f_notimplement
#endif

/*
 * Document-method: Curses::Window.close
 *
 * Deletes the window, and frees the memory
 */
static VALUE
window_close(VALUE obj)
{
    struct windata *winp;

    GetWINDOW(obj, winp);
    delwin(winp->window);
    winp->window = 0;

    return Qnil;
}

/*
 * Document-method: Curses::Window.clear
 *
 * Clear the window.
 */
static VALUE
window_clear(VALUE obj)
{
    struct windata *winp;

    GetWINDOW(obj, winp);
    wclear(winp->window);

    return Qnil;
}

#ifdef HAVE_WERASE
/*
 * Document-method: Curses::Window.erase
 *
 * Erase the window.
 */
static VALUE
window_erase(VALUE obj)
{
    struct windata *winp;

    GetWINDOW(obj, winp);
    werase(winp->window);

    return Qnil;
}
#else
#define curses_erase rb_f_notimplement
#endif

/*
 * Document-method: Curses::Window.clrtoeol
 *
 * Clear the window to the end of line, that the cursor is currently on.
 */
static VALUE
window_clrtoeol(VALUE obj)
{
    struct windata *winp;

    GetWINDOW(obj, winp);
    wclrtoeol(winp->window);

    return Qnil;
}

/*
 * Document-method: Curses::Window.refresh
 *
 * Refreshes the windows and lines.
 *
 */
static VALUE
window_refresh(VALUE obj)
{
    struct windata *winp;

    GetWINDOW(obj, winp);
    wrefresh(winp->window);

    return Qnil;
}

/*
 * Document-method: Curses::Window.noutrefresh
 *
 * Refreshes the windows and lines.
 *
 * Curses::Window.noutrefresh allows multiple updates with
 * more efficiency than Curses::Window.refresh alone.
 */
static VALUE
window_noutrefresh(VALUE obj)
{
    struct windata *winp;

    GetWINDOW(obj, winp);
#ifdef HAVE_DOUPDATE
    wnoutrefresh(winp->window);
#else
    wrefresh(winp->window);
#endif

    return Qnil;
}

#ifdef HAVE_REDRAWWIN
/*
 * Document-method: Curses::Window.redraw
 *
 * Redraws the entire window.
 */
static VALUE
window_redraw(VALUE obj)
{
    struct windata *winp;

    GetWINDOW(obj, winp);
    redrawwin(winp->window);

    return Qnil;
}
#else
#define window_redraw rb_f_notimplement
#endif

#ifdef HAVE_TOUCHWIN
/*
 * Document-method: Curses::Window.touch
 *
 * Treat the window as if it has been modified since the last call of refresh.
 */
static VALUE
window_touch(VALUE obj)
{
    struct windata *winp;

    GetWINDOW(obj, winp);
    touchwin(winp->window);

    return Qnil;
}
#else
#define window_touch rb_f_notimplement
#endif

#ifdef HAVE_UNTOUCHWIN
/*
 * Document-method: Curses::Window.untouch
 *
 * Treat the window as if it has not been modified since the last call of
 * refresh.
 */
static VALUE
window_untouch(VALUE obj)
{
    struct windata *winp;

    GetWINDOW(obj, winp);
    untouchwin(winp->window);

    return Qnil;
}
#else
#define window_touch rb_f_notimplement
#endif

#ifdef HAVE_IS_WINTOUCHED
/*
 * Document-method: Curses::Window.touched?
 *
 * Return true if the window has been modified since the last call of refresh.
 */
static VALUE
window_touched(VALUE obj)
{
    struct windata *winp;

    GetWINDOW(obj, winp);
    return is_wintouched(winp->window) ? Qtrue : Qfalse;
}
#else
#define window_touched rb_f_notimplement
#endif

#ifdef HAVE_WTOUCHLN
/*
 * Document-method: Curses::Window.touch_line
 * call-seq: touch_line(y, n, changed = true)
 *
 * Make n lines from line y look as if they have (changed = true) or have not
 * (changed = false) been modified since the last call of refresh.
 */
static VALUE
window_touch_line(int argc, VALUE *argv, VALUE obj)
{
    struct windata *winp;
    VALUE y, n, changed;
    int result;

    rb_scan_args(argc, argv, "12", &y, &n, &changed);
    if (argc < 2) {
	n = INT2NUM(1);
    }
    if (argc < 3) {
	changed = Qtrue;
    }
    GetWINDOW(obj, winp);
    result = wtouchln(winp->window, NUM2INT(y), NUM2INT(n), RTEST(changed));
    if (result == ERR) {
	rb_raise(rb_eRangeError, "Out of window");
    }

    return Qnil;
}
#else
#define window_touch_line rb_f_notimplement
#endif

#ifdef HAVE_IS_LINETOUCHED
/*
 * Document-method: Curses::Window.line_touched?
 * call-seq: line_touched?(line)
 *
 * Return true if the specified line has been modified since the last call of
 * refresh.
 */
static VALUE
window_line_touched(VALUE obj, VALUE line)
{
    struct windata *winp;
    int result, n;

    GetWINDOW(obj, winp);
    n = NUM2INT(line);
    result = is_linetouched(winp->window, n);
    if (result == ERR) {
	rb_raise(rb_eArgError, "Invalid line %d", n);
    }
    return result ? Qtrue : Qfalse;
}
#else
#define window_line_touched rb_f_notimplement
#endif

/*
 * Document-method: Curses::Window.move
 * call-seq: move(y,x)
 *
 * Moves the window so that the upper left-hand corner is at position (+y+, +x+)
 */
static VALUE
window_move(VALUE obj, VALUE y, VALUE x)
{
    struct windata *winp;

    GetWINDOW(obj, winp);
    mvwin(winp->window, NUM2INT(y), NUM2INT(x));

    return Qnil;
}

#ifdef HAVE_MVDERWIN
/*
 * Document-method: Curses::Window.move_relative
 * call-seq: move_relative(x,y)
 *
 * Moves the derived or subwindow inside its parent window. The screen-relative
 * parameters of the window are not changed.
 */
static VALUE
window_move_relative(VALUE obj, VALUE y, VALUE x)
{
    struct windata *winp;

    GetWINDOW(obj, winp);
    mvderwin(winp->window, NUM2INT(y), NUM2INT(x));

    return Qnil;
}
#else
#define window_move_relative rb_f_notimplement
#endif

/*
 * Document-method: Curses::Window.setpos
 * call-seq: setpos(y, x)
 *
 * A setter for the position of the cursor
 * in the current window,
 * using coordinates +x+ and +y+
 *
 */
static VALUE
window_setpos(VALUE obj, VALUE y, VALUE x)
{
    struct windata *winp;

    GetWINDOW(obj, winp);
    wmove(winp->window, NUM2INT(y), NUM2INT(x));
    return Qnil;
}

/*
 * Document-method: Curses::Window.cury
 *
 * A getter for the current line (Y coord) of the window
 */
static VALUE
window_cury(VALUE obj)
{
    struct windata *winp;
    int RB_UNUSED_VAR(x), y;

    GetWINDOW(obj, winp);
    getyx(winp->window, y, x);
    return INT2FIX(y);
}

/*
 * Document-method: Curses::Window.curx
 *
 * A getter for the current column (X coord) of the window
 */
static VALUE
window_curx(VALUE obj)
{
    struct windata *winp;
    int x, RB_UNUSED_VAR(y);

    GetWINDOW(obj, winp);
    getyx(winp->window, y, x);
    return INT2FIX(x);
}

/*
 * Document-method: Curses::Window.maxy
 *
 * A getter for the maximum lines for the window
 */
static VALUE
window_maxy(VALUE obj)
{
    struct windata *winp;

    GetWINDOW(obj, winp);
#if defined(getmaxy)
    return INT2FIX(getmaxy(winp->window));
#elif defined(getmaxyx)
    {
	int RB_UNUSED_VAR(x), y;
	getmaxyx(winp->window, y, x);
	return INT2FIX(y);
    }
#else
    return INT2FIX(winp->window->_maxy+1);
#endif
}

/*
 * Document-method: Curses::Window.maxx
 *
 * A getter for the maximum columns for the window
 */
static VALUE
window_maxx(VALUE obj)
{
    struct windata *winp;

    GetWINDOW(obj, winp);
#if defined(getmaxx)
    return INT2FIX(getmaxx(winp->window));
#elif defined(getmaxyx)
    {
	int x, RB_UNUSED_VAR(y);
	getmaxyx(winp->window, y, x);
	return INT2FIX(x);
    }
#else
    return INT2FIX(winp->window->_maxx+1);
#endif
}

/*
 * Document-method: Curses::Window.begy
 *
 * A getter for the beginning line (Y coord) of the window
 */
static VALUE
window_begy(VALUE obj)
{
    struct windata *winp;
    int RB_UNUSED_VAR(x), y;

    GetWINDOW(obj, winp);
#ifdef getbegyx
    getbegyx(winp->window, y, x);
#else
    y = winp->window->_begy;
#endif
    return INT2FIX(y);
}

/*
 * Document-method: Curses::Window.begx
 *
 * A getter for the beginning column (X coord) of the window
 */
static VALUE
window_begx(VALUE obj)
{
    struct windata *winp;
    int x, RB_UNUSED_VAR(y);

    GetWINDOW(obj, winp);
#ifdef getbegyx
    getbegyx(winp->window, y, x);
#else
    x = winp->window->_begx;
#endif
    return INT2FIX(x);
}

/*
 * Document-method: Curses::Window.box
 * call-seq: box(vert = nil, hor = nil, corn = nil)
 *
 * set the characters to frame the window in.
 * The vertical +vert+ and horizontal +hor+ character.
 *
 * 	win = Curses::Window.new(5,5,5,5)
 * 	win.box(?|, ?-)
 *
 */
static VALUE
window_box(int argc, VALUE *argv, VALUE self)
{
    struct windata *winp;
    VALUE vert, hor, corn;

    rb_scan_args(argc, argv, "03", &vert, &hor, &corn);

    GetWINDOW(self, winp);
    box(winp->window,
	NIL_P(vert) ? 0 : OBJ2CHTYPE(vert),
	NIL_P(hor) ? 0 : OBJ2CHTYPE(hor));

    if (!NIL_P(corn)) {
	int cur_x, cur_y, x, y;
	chtype c;

	c = OBJ2CHTYPE(corn);
	getyx(winp->window, cur_y, cur_x);
	x = NUM2INT(window_maxx(self)) - 1;
	y = NUM2INT(window_maxy(self)) - 1;
	wmove(winp->window, 0, 0);
	waddch(winp->window, c);
	wmove(winp->window, y, 0);
	waddch(winp->window, c);
	wmove(winp->window, y, x);
	waddch(winp->window, c);
	wmove(winp->window, 0, x);
	waddch(winp->window, c);
	wmove(winp->window, cur_y, cur_x);
    }

    return Qnil;
}

/*
 * Document-method: Curses::Window.standout
 *
 * Enables the best highlighting mode of the terminal.
 *
 * This is equivalent to Curses::Window.attron(A_STANDOUT)
 *
 * see also Curses::Window.attrset
 */
static VALUE
window_standout(VALUE obj)
{
    struct windata *winp;

    GetWINDOW(obj, winp);
    wstandout(winp->window);
    return Qnil;
}

/*
 * Document-method: Curses::Window.standend
 *
 * Enables the Normal display (no highlight)
 *
 * This is equivalent to Curses::Window.attron(A_NORMAL)
 *
 * see also Curses::Window.attrset
 */
static VALUE
window_standend(VALUE obj)
{
    struct windata *winp;

    GetWINDOW(obj, winp);
    wstandend(winp->window);
    return Qnil;
}

/*
 * Document-method: Curses::Window.inch
 *
 * Returns the character at the current position of the window.
 */
static VALUE
window_inch(VALUE obj)
{
    struct windata *winp;

    GetWINDOW(obj, winp);
    return CHTYPE2NUM(winch(winp->window));
}

/*
 * Document-method: Curses::Window.addch
 * call-seq: addch(ch)
 *
 * Add a character +ch+, with attributes, to the window, then advance the cursor.
 *
 * see also the system manual for curs_addch(3)
 */
static VALUE
window_addch(VALUE obj, VALUE ch)
{
    struct windata *winp;

    GetWINDOW(obj, winp);
    waddch(winp->window, OBJ2CHTYPE(ch));

    return Qnil;
}

/*
 * Document-method: Curses::Window.insch
 * call-seq: insch(ch)
 *
 * Insert a character +ch+, before the cursor, in the current window
 *
 */
static VALUE
window_insch(VALUE obj, VALUE ch)
{
    struct windata *winp;

    GetWINDOW(obj, winp);
    winsch(winp->window, OBJ2CHTYPE(ch));

    return Qnil;
}

/*
 * Document-method: Curses::Window.addstr
 * call-seq: addstr(str)
 *
 * add a string of characters +str+, to the window and advance cursor
 *
 */
static VALUE
window_addstr(VALUE obj, VALUE str)
{
    if (!NIL_P(str)) {
	struct windata *winp;

	StringValue(str);
#if defined(HAVE_WADDNWSTR) && defined(_WIN32)
	str = rb_str_export_to_enc(str, get_wide_encoding());
	GetWINDOW(obj, winp);
	waddnwstr(winp->window, (wchar_t *)RSTRING_PTR(str), RSTRING_LEN(str) / sizeof(wchar_t));
#else
	str = rb_str_export_to_enc(str, terminal_encoding);
	GetWINDOW(obj, winp);
	waddstr(winp->window, StringValueCStr(str));
#endif
    }
    return Qnil;
}

/*
 * Document-method: Curses::Window.<<
 *
 * call-seq:
 *   <<(str)
 *
 * Add String +str+ to the current string.
 *
 * See also Curses::Window.addstr
 */
static VALUE
window_addstr2(VALUE obj, VALUE str)
{
    window_addstr(obj, str);
    return obj;
}

struct wgetch_arg {
    WINDOW *win;
    int c;
};

static void *
wgetch_func(void *_arg)
{
    struct wgetch_arg *arg = (struct wgetch_arg *)_arg;
    arg->c = wgetch(arg->win);
    return 0;
}

/*
 * Document-method: Curses::Window.getch
 *
 * Read and returns a character from the window.
 *
 * See Curses::Key to all the function KEY_* available
 *
 */
static VALUE
window_getch(VALUE obj)
{
    struct windata *winp;
    struct wgetch_arg arg;
    int c;

    GetWINDOW(obj, winp);
    arg.win = winp->window;
    rb_thread_call_without_gvl(wgetch_func, (void *)&arg, RUBY_UBF_IO, 0);
    c = arg.c;
    if (c == EOF) return Qnil;
    if (rb_isprint(c)) {
	char ch = (char)c;

	return rb_external_str_new_with_enc(&ch, 1, keyboard_encoding);
    }
    return UINT2NUM(c);
}

struct wgetstr_arg {
    WINDOW *win;
    char rtn[GETSTR_BUF_SIZE];
};

static void *
wgetstr_func(void *_arg)
{
    struct wgetstr_arg *arg = (struct wgetstr_arg *)_arg;
#if defined(HAVE_WGETNSTR)
    wgetnstr(arg->win, arg->rtn, GETSTR_BUF_SIZE-1);
#else
    wgetstr(arg->win, arg->rtn);
#endif
    return 0;
}

/*
 * Document-method: Curses::Window.getstr
 *
 * This is equivalent to a series of Curses::Window.getch calls
 *
 */
static VALUE
window_getstr(VALUE obj)
{
    struct windata *winp;
    struct wgetstr_arg arg;

    GetWINDOW(obj, winp);
    arg.win = winp->window;
    rb_thread_call_without_gvl(wgetstr_func, (void *)&arg, RUBY_UBF_IO, 0);
    return rb_external_str_new_with_enc(arg.rtn, strlen(arg.rtn),
				       	keyboard_encoding);
}

/*
 * Document-method: Curses::Window.delch
 *
 * Delete the character under the cursor
 *
 */
static VALUE
window_delch(VALUE obj)
{
    struct windata *winp;

    GetWINDOW(obj, winp);
    wdelch(winp->window);
    return Qnil;
}

/*
 * Document-method: Curses::Window.deleteln
 *
 * Delete the line under the cursor.
 *
 */
static VALUE
window_deleteln(VALUE obj)
{
#if defined(HAVE_WDELETELN) || defined(wdeleteln)
    struct windata *winp;

    GetWINDOW(obj, winp);
    wdeleteln(winp->window);
#endif
    return Qnil;
}

/*
 * Document-method: Curses::Window.insertln
 *
 * Inserts a line above the cursor, and the bottom line is lost
 *
 */
static VALUE
window_insertln(VALUE obj)
{
#if defined(HAVE_WINSERTLN) || defined(winsertln)
    struct windata *winp;

    GetWINDOW(obj, winp);
    winsertln(winp->window);
#endif
    return Qnil;
}

/*
 * Document-method: Curses::Window.scrollok
 * call-seq: scrollok(bool)
 *
 * Controls what happens when the cursor of a window
 * is moved off the edge of the window or scrolling region,
 * either as a result of a newline action on the bottom line,
 * or typing the last character of the last line.
 *
 * If disabled, (+bool+ is false), the cursor is left on the bottom line.
 *
 * If enabled, (+bool+ is true), the window is scrolled up one line
 * (Note that to get the physical scrolling effect on the terminal,
 * it is also necessary to call Curses::Window.idlok)
 */
static VALUE
window_scrollok(VALUE obj, VALUE bf)
{
    struct windata *winp;

    GetWINDOW(obj, winp);
    scrollok(winp->window, RTEST(bf) ? TRUE : FALSE);
    return Qnil;
}

/*
 * Document-method: Curses::Window.idlok
 * call-seq: idlok(bool)
 *
 * If +bool+ is +true+ curses considers using the hardware insert/delete
 * line feature of terminals so equipped.
 *
 * If +bool+ is +false+, disables use of line insertion and deletion.
 * This option should be enabled only if the application needs insert/delete
 * line, for example, for a screen editor.
 *
 * It is disabled by default because insert/delete line tends to be visually
 * annoying when used in applications where it is not really needed.
 * If insert/delete line cannot be used, curses redraws the changed portions of all lines.
 *
 */
static VALUE
window_idlok(VALUE obj, VALUE bf)
{
    struct windata *winp;

    GetWINDOW(obj, winp);
    idlok(winp->window, RTEST(bf) ? TRUE : FALSE);
    return Qnil;
}

/*
 * Document-method: Curses::Window.setscrreg
 * call-seq:
 *   setscrreg(top, bottom)
 *
 * Set a software scrolling region in a window.
 * +top+ and +bottom+ are lines numbers of the margin.
 *
 * If this option and Curses::Window.scrollok are enabled, an attempt to move
 * off the bottom margin line causes all lines in the scrolling region to
 * scroll one line in the direction of the first line.  Only the text of the
 * window is scrolled.
 *
 */
static VALUE
window_setscrreg(VALUE obj, VALUE top, VALUE bottom)
{
#ifdef HAVE_WSETSCRREG
    struct windata *winp;
    int res;

    GetWINDOW(obj, winp);
    res = wsetscrreg(winp->window, NUM2INT(top), NUM2INT(bottom));
    /* may have to raise exception on ERR */
    return (res == OK) ? Qtrue : Qfalse;
#else
    return Qfalse;
#endif
}

#if defined(USE_COLOR) && ((defined(HAVE_WATTR_SET) && defined(HAVE_WATTR_GET)) || defined(HAVE_WCOLOR_SET))
/*
 * Document-method: Curses::Window.color_set
 * call-seq: color_set(col)
 *
 * Sets the current color of the given window to the
 * foreground/background combination described by the Fixnum +col+.
 */
static VALUE
window_color_set(VALUE obj, VALUE col)
{
    struct windata *winp;

    GetWINDOW(obj, winp);
#if defined(HAVE_WATTR_SET) && defined(HAVE_WATTR_GET)
    /* Use wattr_set to support pair numbers > 255; preserve existing attrs. */
    {
	attr_t attrs;
#ifdef NCURSES_PAIRS_T
	NCURSES_PAIRS_T current_pair;
#else
	short current_pair;
#endif
	if (wattr_get(winp->window, &attrs, &current_pair, NULL) == ERR)
	    return Qfalse;
	return (wattr_set(winp->window, attrs, NUM2INT(col), NULL) == OK) ? Qtrue : Qfalse;
    }
#else
    return (wcolor_set(winp->window, NUM2INT(col), NULL) == OK) ? Qtrue : Qfalse;
#endif
}
#endif /* defined(USE_COLOR) && ((defined(HAVE_WATTR_SET) && defined(HAVE_WATTR_GET)) || defined(HAVE_WCOLOR_SET)) */

/*
 * Document-method: Curses::Window.scroll
 *
 * Scrolls the current window up one line.
 */
static VALUE
window_scroll(VALUE obj)
{
    struct windata *winp;

    GetWINDOW(obj, winp);
    /* may have to raise exception on ERR */
    return (scroll(winp->window) == OK) ? Qtrue : Qfalse;
}

/*
 * Document-method: Curses::Window.scrl
 * call-seq: scrl(num)
 *
 * Scrolls the current window Fixnum +num+ lines.
 * The current cursor position is not changed.
 *
 * For positive +num+, it scrolls up.
 *
 * For negative +num+, it scrolls down.
 *
 */
static VALUE
window_scrl(VALUE obj, VALUE n)
{
#ifdef HAVE_WSCRL
    struct windata *winp;

    GetWINDOW(obj, winp);
    /* may have to raise exception on ERR */
    return (wscrl(winp->window,NUM2INT(n)) == OK) ? Qtrue : Qfalse;
#else
    return Qfalse;
#endif
}

/*
 * Document-method: Curses::Window.attroff
 * call-seq: attroff(attrs)
 *
 * Turns off the named attributes +attrs+
 * without affecting any others.
 *
 * See also Curses::Window.attrset
 */
static VALUE
window_attroff(VALUE obj, VALUE attrs)
{
#ifdef HAVE_WATTROFF
    struct windata *winp;

    GetWINDOW(obj,winp);
    return INT2FIX(wattroff(winp->window,NUM2CHTYPE(attrs)));
#else
    return Qtrue;
#endif
}

/*
 * Document-method: Curses::Window.attron
 * call-seq: attron(attrs)
 *
 * Turns on the named attributes +attrs+
 * without turning any other attributes on or off.
 *
 * See also Curses::Window.attrset
 */
static VALUE
window_attron(VALUE obj, VALUE attrs)
{
#ifdef HAVE_WATTRON
    struct windata *winp;
    VALUE val;

    GetWINDOW(obj,winp);
    val = INT2FIX(wattron(winp->window,NUM2CHTYPE(attrs)));
    if (rb_block_given_p()) {
	rb_yield(val);
	wattroff(winp->window,NUM2CHTYPE(attrs));
	return val;
    }
    else{
	return val;
    }
#else
    return Qtrue;
#endif
}

/*
 * Document-method: Curses::Window.attrset
 * call-seq: attrset(attrs)
 *
 * Sets the current attributes of the given window to +attrs+.
 *
 * The following video attributes, defined in <curses.h>, can
 * be passed to the routines Curses::Window.attron, Curses::Window.attroff,
 * and Curses::Window.attrset, or OR'd with the characters passed to addch.
 *   A_NORMAL        Normal display (no highlight)
 *   A_STANDOUT      Best highlighting mode of the terminal.
 *   A_UNDERLINE     Underlining
 *   A_REVERSE       Reverse video
 *   A_BLINK         Blinking
 *   A_DIM           Half bright
 *   A_BOLD          Extra bright or bold
 *   A_PROTECT       Protected mode
 *   A_INVIS         Invisible or blank mode
 *   A_ALTCHARSET    Alternate character set
 *   A_CHARTEXT      Bit-mask to extract a character
 *   COLOR_PAIR(n)   Color-pair number n
 *
 * TODO: provide some examples here.
 *
 * see also system manual curs_attr(3)
 */
static VALUE
window_attrset(VALUE obj, VALUE attrs)
{
#ifdef HAVE_WATTRSET
    struct windata *winp;

    GetWINDOW(obj,winp);
    return INT2FIX(wattrset(winp->window,NUM2CHTYPE(attrs)));
#else
    return Qtrue;
#endif
}

/*
 * Document-method: Curses::Window.attr_set
 * call-seq: attr_set(attrs, pair)
 *
 * Sets the current attributes and color pair of the given window.
 * Unlike Curses::Window.attrset, this method accepts an extended color
 * pair number (> 255) when the ncurses extended colors API is available.
 *
 * Returns +true+ on success, +false+ on failure.
 *
 * see also system manual curs_attr(3)
 */
#ifdef HAVE_WATTR_SET
static VALUE
window_attr_set(VALUE obj, VALUE attrs, VALUE pair)
{
    struct windata *winp;

    GetWINDOW(obj, winp);
    return (wattr_set(winp->window, NUM2UINT(attrs), NUM2INT(pair), NULL) == OK) ? Qtrue : Qfalse;
}
#endif

/*
 * Document-method: Curses::Window.attr_get
 * call-seq: attr_get => [attrs, pair]
 *
 * Returns a 2-element Array of the current attributes and color pair
 * of the given window. The color pair number may exceed 255 when the
 * ncurses extended colors API is available.
 *
 * Returns +nil+ on failure.
 *
 * see also system manual curs_attr(3)
 */
#ifdef HAVE_WATTR_GET
static VALUE
window_attr_get(VALUE obj)
{
    struct windata *winp;
    attr_t attrs;
#ifdef NCURSES_PAIRS_T
    NCURSES_PAIRS_T pair;
#else
    short pair;
#endif

    GetWINDOW(obj, winp);
    if (wattr_get(winp->window, &attrs, &pair, NULL) == ERR)
	return Qnil;
    return rb_ary_new3(2, UINT2NUM(attrs), INT2NUM(pair));
}
#endif

/*
 * Document-method: Curses::Window.bkgdset
 * call-seq: bkgdset(ch)
 *
 * Manipulate the background of the current window
 * with character Integer +ch+
 *
 * see also Curses.bkgdset
 */
static VALUE
window_bkgdset(VALUE obj, VALUE ch)
{
#ifdef HAVE_WBKGDSET
    struct windata *winp;

    GetWINDOW(obj,winp);
    wbkgdset(winp->window, OBJ2CHTYPE(ch));
#endif
    return Qnil;
}

/*
 * Document-method: Curses::Window.bkgd
 * call-seq: bkgd(ch)
 *
 * Set the background of the current window
 * and apply character Integer +ch+ to every character.
 *
 * see also Curses.bkgd
 */
static VALUE
window_bkgd(VALUE obj, VALUE ch)
{
#ifdef HAVE_WBKGD
    struct windata *winp;

    GetWINDOW(obj,winp);
    return (wbkgd(winp->window, OBJ2CHTYPE(ch)) == OK) ? Qtrue : Qfalse;
#else
    return Qfalse;
#endif
}

/*
 * Document-method: Curses::Window.getbkgd
 *
 * Returns an Integer (+ch+) for the character property in the current window.
 */
static VALUE
window_getbkgd(VALUE obj)
{
#ifdef HAVE_WGETBKGD
    chtype c;
    struct windata *winp;

    GetWINDOW(obj,winp);
    return (c = getbkgd(winp->window) != ERR) ? ULONG2NUM(c) : Qnil;
#else
    return Qnil;
#endif
}

/*
 * Document-method: Curses::Window.chgat
 * call-seq: chgat(n, attrs)
 *
 * Changes the attributes of a given number of characters starting at
 * the current cursor location.
 */
static VALUE
window_chgat(VALUE obj, VALUE n, VALUE attrs)
{
#ifdef HAVE_WCHGAT
    chtype a = NUM2CHTYPE(attrs);
    attr_t attr;
    short pair;
    struct windata *winp;

    GetWINDOW(obj,winp);
    attr = a & A_ATTRIBUTES;
    pair = PAIR_NUMBER(attr);
    return (wchgat(winp->window, NUM2INT(n), attr, pair, NULL) == OK) ? Qtrue : Qfalse;
#else
    return Qnil;
#endif
}

/*
 * Document-method: Curses::Window.resize
 * call-seq: resize(lines, cols)
 *
 * Resize the current window to Fixnum +lines+ and Fixnum +cols+
 *
 */
static VALUE
window_resize(VALUE obj, VALUE lin, VALUE col)
{
#if defined(HAVE_WRESIZE)
    struct windata *winp;

    GetWINDOW(obj,winp);
    return wresize(winp->window, NUM2INT(lin), NUM2INT(col)) == OK ? Qtrue : Qfalse;
#else
    return Qnil;
#endif
}


#ifdef HAVE_KEYPAD
/*
 * Document-method: Curses::Window.keypad=
 * call-seq:
 *   keypad=(bool)
 *
 * See Curses::Window.keypad
 */

/*
 * Document-method: Curses::Window.keypad
 * call-seq:
 *   keypad(bool)
 *
 * Enables the keypad of the user's terminal.
 *
 * If enabled (+bool+ is +true+), the user can press a function key
 * (such as an arrow key) and wgetch returns a single value representing
 * the function key, as in KEY_LEFT.  If disabled (+bool+ is +false+),
 * curses does not treat function keys specially and the program has to
 * interpret the escape sequences itself.  If the keypad in the terminal
 * can be turned on (made to transmit) and off (made to work locally),
 * turning on this option causes the terminal keypad to be turned on when
 * Curses::Window.getch is called.
 *
 * The default value for keypad is false.
 *
 */
static VALUE
window_keypad(VALUE obj, VALUE val)
{
    struct windata *winp;

    GetWINDOW(obj,winp);
    /* keypad() of NetBSD's libcurses returns no value */
#if defined(__NetBSD__) && !defined(NCURSES_VERSION)
    keypad(winp->window,(RTEST(val) ? TRUE : FALSE));
    return Qnil;
#else
    /* may have to raise exception on ERR */
    return (keypad(winp->window,RTEST(val) ? TRUE : FALSE)) == OK ?
	Qtrue : Qfalse;
#endif
}
#else
#define window_keypad rb_f_notimplement
#endif

#ifdef HAVE_NODELAY
/*
 * Document-method: Curses::Window.nodelay
 * call-seq:
 *   window.nodelay = bool
 *
 * When in no-delay mode Curses::Window#getch is a non-blocking call.  If no
 * input is ready #getch returns ERR.
 *
 * When in delay mode (+bool+ is +false+ which is the default),
 * Curses::Window#getch blocks until a key is pressed.
 *
 */
static VALUE
window_nodelay(VALUE obj, VALUE val)
{
    struct windata *winp;
    GetWINDOW(obj,winp);

    /* nodelay() of NetBSD's libcurses returns no value */
#if defined(__NetBSD__) && !defined(NCURSES_VERSION)
    nodelay(winp->window, RTEST(val) ? TRUE : FALSE);
    return Qnil;
#else
    return nodelay(winp->window,RTEST(val) ? TRUE : FALSE) == OK ? Qtrue : Qfalse;
#endif
}
#else
#define window_nodelay rb_f_notimplement
#endif

#ifdef HAVE_WTIMEOUT
/*
 * Document-method: Curses::Window.timeout=
 * call-seq: timeout=(delay)
 *
 * Sets block and non-blocking reads for the window.
 * - If delay is negative, blocking read is used (i.e., waits indefinitely for input).
 * - If delay is zero, then non-blocking read is used (i.e., read returns ERR if no input is waiting).
 * - If delay is positive, then read blocks for delay milliseconds, and returns ERR if there is still no input.
 *
 */
static VALUE
window_timeout(VALUE obj, VALUE delay)
{
    struct windata *winp;
    GetWINDOW(obj,winp);

    wtimeout(winp->window,NUM2INT(delay));
    return Qnil;
}
#else
#define window_timeout rb_f_notimplement
#endif

/*--------------------------- class Pad ----------------------------*/

#ifdef HAVE_NEWPAD
/*
 * Document-method: Curses::Pad.new
 *
 * call-seq:
 *   new(height, width)
 *
 * Construct a new Curses::Pad with constraints of +height+ lines, +width+
 * columns
 *
 */
static VALUE
pad_initialize(VALUE obj, VALUE h, VALUE w)
{
    struct windata *padp;
    WINDOW *window;

    curses_init_screen(Qnil);
    TypedData_Get_Struct(obj, struct windata, &windata_type, padp);
    if (padp->window) delwin(padp->window);
    window = newpad(NUM2INT(h), NUM2INT(w));
    wclear(window);
    padp->window = window;

    return obj;
}

/*
 * Document-method: Curses::Pad.subpad
 * call-seq:
 *   subpad(height, width, begin_x, begin_y)
 *
 * Construct a new subpad with constraints of +height+ lines, +width+ columns,
 * begin at +begin_x+ line, and +begin_y+ columns on the pad.
 *
 */
static VALUE
pad_subpad(VALUE obj, VALUE height, VALUE width, VALUE begin_x, VALUE begin_y)
{
    struct windata *padp;
    WINDOW *sub_pad;
    VALUE pad;
    int h, w, x, y;

    h = NUM2INT(height);
    w = NUM2INT(width);
    x = NUM2INT(begin_x);
    y = NUM2INT(begin_y);
    GetWINDOW(obj, padp);
    sub_pad = subpad(padp->window, h, w, x, y);
    pad = prep_window(rb_obj_class(obj), sub_pad, 0);

    return pad;
}

/*
 * Document-method: Curses::Pad.refresh
 *
 * call-seq:
 *   pad.refresh(pad_minrow, pad_mincol, screen_minrow, screen_mincol, screen_maxrow, screen_maxcol)
 *
 * Refreshes the pad.  +pad_minrow+ and pad_mincol+ define the upper-left
 * corner of the rectangle to be displayed.  +screen_minrow+, +screen_mincol+,
 * +screen_maxrow+, +screen_maxcol+ define the edges of the rectangle to be
 * displayed on the screen.
 *
 */
static VALUE
pad_refresh(VALUE obj, VALUE pminrow, VALUE pmincol, VALUE sminrow,
	    VALUE smincol, VALUE smaxrow, VALUE smaxcol)
{
    struct windata *padp;
    int pmr, pmc, smr, smc, sxr, sxc;

    pmr = NUM2INT(pminrow);
    pmc = NUM2INT(pmincol);
    smr = NUM2INT(sminrow);
    smc = NUM2INT(smincol);
    sxr = NUM2INT(smaxrow);
    sxc = NUM2INT(smaxcol);

    GetWINDOW(obj, padp);
    prefresh(padp->window, pmr, pmc, smr, smc, sxr, sxc);

    return Qnil;
}

/*
 * Document-method: Curses::Pad.noutrefresh
 *
 * call-seq:
 *   pad.noutrefresh(pad_minrow, pad_mincol, screen_minrow, screen_mincol, screen_maxrow, screen_maxcol)
 *
 * Refreshes the pad.  +pad_minrow+ and pad_mincol+ define the upper-left
 * corner of the rectangle to be displayed.  +screen_minrow+, +screen_mincol+,
 * +screen_maxrow+, +screen_maxcol+ define the edges of the rectangle to be
 * displayed on the screen.
 *
 */
static VALUE
pad_noutrefresh(VALUE obj, VALUE pminrow, VALUE pmincol, VALUE sminrow,
		VALUE smincol, VALUE smaxrow, VALUE smaxcol)
{
    struct windata *padp;
    int pmr, pmc, smr, smc, sxr, sxc;

    pmr = NUM2INT(pminrow);
    pmc = NUM2INT(pmincol);
    smr = NUM2INT(sminrow);
    smc = NUM2INT(smincol);
    sxr = NUM2INT(smaxrow);
    sxc = NUM2INT(smaxcol);

    GetWINDOW(obj, padp);
#ifdef HAVE_DOUPDATE
    pnoutrefresh(padp->window, pmr, pmc, smr, smc, sxr, sxc);
#else
    prefresh(padp->window, pmr, pmc, smr, smc, sxr, sxc);
#endif

    return Qnil;
}
#endif /* HAVE_NEWPAD */

#ifdef HAVE_MENU
/*--------------------------- class Item ----------------------------*/

struct itemdata {
    ITEM *item;
};

static void
no_item(void)
{
    rb_raise(rb_eRuntimeError, "already deleted item");
}

#define GetITEM(obj, itemp) do {\
    TypedData_Get_Struct((obj), struct itemdata, &itemdata_type, (itemp));\
    if ((itemp)->item == 0) no_item();\
} while (0)

static void
item_free(void *p)
{
    struct itemdata *itemp = p;
    if (itemp->item) free_item(itemp->item);
    itemp->item = 0;
    xfree(itemp);
}

static size_t
item_memsize(const void *p)
{
    const struct itemdata *itemp = p;
    size_t size = sizeof(*itemp);
    if (!itemp) return 0;
    if (itemp->item) size += CURSES_SIZEOF_ITEM;
    return size;
}

static const rb_data_type_t itemdata_type = {
    "itemdata",
    {0, item_free, item_memsize,}
};

/* returns a Curses::Item object */
static VALUE
item_s_allocate(VALUE class)
{
    struct itemdata *itemp;

    return TypedData_Make_Struct(class, struct itemdata, &itemdata_type, itemp);
}

/*
 * Document-method: Curses::Item.new
 *
 * call-seq:
 *   new(name, description)
 *
 * Construct a new Curses::Item.
 */
static VALUE
item_initialize(VALUE obj, VALUE name, VALUE description)
{
    struct itemdata *itemp;

    curses_init_screen(Qnil);
    TypedData_Get_Struct(obj, struct itemdata, &itemdata_type, itemp);
    if (itemp->item) {
	rb_raise(rb_eRuntimeError, "already initialized item");
    }
    name = rb_str_export_to_enc(name, terminal_encoding);
    description = rb_str_export_to_enc(description, terminal_encoding);
    itemp->item = new_item(StringValueCStr(name),
			   StringValueCStr(description));
    if (itemp->item == NULL) {
	check_curses_error(errno);
    }

    return obj;
}

static VALUE
item_new(ITEM *item)
{
    VALUE obj = item_s_allocate(cItem);
    struct itemdata *itemp;

    TypedData_Get_Struct(obj, struct itemdata, &itemdata_type, itemp);
    itemp->item = item;
    return obj;
}

static VALUE
item_eq(VALUE obj, VALUE other)
{
    struct itemdata *item1, *item2;

    GetITEM(obj, item1);
    GetITEM(other, item2);
    return item1->item == item2->item ? Qtrue : Qfalse;
}

static VALUE
item_name_m(VALUE obj)
{
    struct itemdata *itemp;
    const char *name;

    GetITEM(obj, itemp);
    name = item_name(itemp->item);
    return rb_external_str_new_with_enc(name, strlen(name), terminal_encoding);
}

static VALUE
item_description_m(VALUE obj)
{
    struct itemdata *itemp;
    const char *desc;

    GetITEM(obj, itemp);
    desc = item_description(itemp->item);
    return rb_external_str_new_with_enc(desc, strlen(desc), terminal_encoding);
}

/*
 * Document-method: Curses::Item#set_opts
 *
 * call-seq:
 *   set_opts(opts)
 *
 * Set the option bits of the item.
 */
static VALUE
item_set_opts(VALUE obj, VALUE opts)
{
    struct itemdata *itemp;
    int error;

    GetITEM(obj, itemp);
    error = set_item_opts(itemp->item, NUM2INT(opts));
    check_curses_error(error);
    return obj;
}

/*
 * Document-method: Curses::Item#opts_on
 *
 * call-seq:
 *   opts_on(opts)
 *
 * Turn on the option bits of the item.
 */
static VALUE
item_opts_on_m(VALUE obj, VALUE opts)
{
    struct itemdata *itemp;
    int error;

    GetITEM(obj, itemp);
    error = item_opts_on(itemp->item, NUM2INT(opts));
    check_curses_error(error);
    return obj;
}

/*
 * Document-method: Curses::Item#opts_off
 *
 * call-seq:
 *   opts_off(opts)
 *
 * Turn off the option bits of the item.
 */
static VALUE
item_opts_off_m(VALUE obj, VALUE opts)
{
    struct itemdata *itemp;
    int error;

    GetITEM(obj, itemp);
    error = item_opts_off(itemp->item, NUM2INT(opts));
    check_curses_error(error);
    return obj;
}

/*
 * Document-method: Curses::Item#opts
 *
 * call-seq:
 *   opts
 *
 * Get the current option bits of the item.
 */
static VALUE
item_opts_m(VALUE obj)
{
    struct itemdata *itemp;

    GetITEM(obj, itemp);
    return INT2NUM(item_opts(itemp->item));
}

struct menudata {
    MENU *menu;
    VALUE items;
};

static void
no_menu(void)
{
    rb_raise(rb_eRuntimeError, "already deleted menu");
}

#define GetMENU(obj, menup) do {\
    TypedData_Get_Struct((obj), struct menudata, &menudata_type, (menup));\
    if ((menup)->menu == 0) no_menu();\
} while (0)

static void
menu_gc_mark(void *p)
{
    struct menudata *menup = p;

    rb_gc_mark(menup->items);
}    

static void
menu_free(void *p)
{
    struct menudata *menup = p;
    ITEM **items = menu_items(menup->menu);
    if (menup->menu) free_menu(menup->menu);
    xfree(items);
    menup->menu = 0;
    menup->items = Qnil;
    xfree(menup);
}

static size_t
menu_memsize(const void *p)
{
    const struct menudata *menup = p;
    size_t size = sizeof(*menup);
    if (!menup) return 0;
    if (menup->menu) size += CURSES_SIZEOF_MENU;
    return size;
}

static const rb_data_type_t menudata_type = {
    "menudata",
    {menu_gc_mark, menu_free, menu_memsize,}
};

/* returns a Curses::Menu object */
static VALUE
menu_s_allocate(VALUE class)
{
    struct menudata *menup;

    return TypedData_Make_Struct(class, struct menudata, &menudata_type, menup);
}

/*
 * Document-method: Curses::Menu.new
 *
 * call-seq:
 *   new(items)
 *
 * Construct a new Curses::Menu.
 */
static VALUE
menu_initialize(VALUE obj, VALUE items)
{
    struct menudata *menup;
    ITEM **menu_items;
    int i;
    ID id_new;

    Check_Type(items, T_ARRAY);
    curses_init_screen(Qnil);
    TypedData_Get_Struct(obj, struct menudata, &menudata_type, menup);
    if (menup->menu) {
	rb_raise(rb_eRuntimeError, "already initialized menu");
    }
    menup->items = rb_ary_new();
    menu_items = ALLOC_N(ITEM *, RARRAY_LEN(items) + 1);
    CONST_ID(id_new, "new");
    for (i = 0; i < RARRAY_LEN(items); i++) {
	VALUE item = RARRAY_AREF(items, i);
	struct itemdata *itemp;

	if (RB_TYPE_P(item, T_ARRAY)) {
	    item = rb_apply(cItem, id_new, item);
	}
	GetITEM(item, itemp);
	menu_items[i] = itemp->item;
	rb_ary_push(menup->items, item);
    }
    menu_items[RARRAY_LEN(items)] = NULL;
    menup->menu = new_menu(menu_items);
    if (menup->menu == NULL) {
	check_curses_error(errno);
    }

    return obj;
}

/*
 * Document-method: Curses::Menu#post
 *
 * call-seq:
 *   post
 *
 * Post the menu.
 */
static VALUE
menu_post(VALUE obj)
{
    struct menudata *menup;
    int error;

    GetMENU(obj, menup);
    error = post_menu(menup->menu);
    check_curses_error(error);

    return obj;
}

/*
 * Document-method: Curses::Menu#unpost
 *
 * call-seq:
 *   unpost
 *
 * Unpost the menu.
 */
static VALUE
menu_unpost(VALUE obj)
{
    struct menudata *menup;
    int error;

    GetMENU(obj, menup);
    error = unpost_menu(menup->menu);
    check_curses_error(error);

    return obj;
}

/*
 * Document-method: Curses::Menu#driver
 *
 * call-seq:
 *   driver(command)
 *
 * Perform the command on the menu.
 */
static VALUE
menu_driver_m(VALUE obj, VALUE command)
{
    struct menudata *menup;
    int error;

    GetMENU(obj, menup);
    error = menu_driver(menup->menu, NUM2INT(command));
    check_curses_error(error);

    return obj;
}

/*
 * Document-method: Curses::Menu#item_count
 *
 * call-seq:
 *   item_count
 *
 * Returns the count of items in the menu.
 */
static VALUE
menu_item_count(VALUE obj)
{
    struct menudata *menup;

    GetMENU(obj, menup);
    return INT2NUM(item_count(menup->menu));
}

/*
 * Document-method: Curses::Menu#items
 *
 * call-seq:
 *   items
 *
 * Returns the items of the menu.
 */
static VALUE
menu_get_items(VALUE obj)
{
    struct menudata *menup;
    ITEM **items;
    int count, i;
    VALUE ary;

    GetMENU(obj, menup);
    items = menu_items(menup->menu);
    if (items == NULL) {
	return Qnil;
    }
    count = item_count(menup->menu);
    ary = rb_ary_new();
    for (i = 0; i < count; i++) {
	rb_ary_push(ary, item_new(items[i]));
    }
    return ary;
}

/*
 * Document-method: Curses::Menu#items=
 *
 * call-seq:
 *   items=(items)
 *
 * Returns the items of the menu.
 */
static VALUE
menu_set_items(VALUE obj, VALUE items)
{
    struct menudata *menup;
    ITEM **old_items, **new_items;
    int i, error;

    Check_Type(items, T_ARRAY);
    GetMENU(obj, menup);
    old_items = menu_items(menup->menu);
    new_items = ALLOC_N(ITEM*, RARRAY_LEN(items) + 1);
    for (i = 0; i < RARRAY_LEN(items); i++) {
	struct itemdata *itemp;
	GetITEM(RARRAY_AREF(items, i), itemp);
	new_items[i] = itemp->item;
    }
    new_items[RARRAY_LEN(items)] = NULL;
    error = set_menu_items(menup->menu, new_items);
    if (error != E_OK) {
	xfree(new_items);
	check_curses_error(error);
	return items;
    }
    xfree(old_items);
    menup->items = rb_ary_dup(items);
    return items;
}

/*
 * Document-method: Curses::Menu#current_item
 *
 * call-seq:
 *   current_item
 *
 * Returns the current item.
 */
static VALUE
menu_get_current_item(VALUE obj)
{
    struct menudata *menup;
    ITEM *item;

    GetMENU(obj, menup);
    item = current_item(menup->menu);
    if (item == NULL) {
	return Qnil;
    }
    return item_new(item);
}

/*
 * Document-method: Curses::Menu#current_item=
 *
 * call-seq:
 *   current_item=(item)
 *
 * Sets the current item.
 */
static VALUE
menu_set_current_item(VALUE obj, VALUE item)
{
    struct menudata *menup;
    struct itemdata *itemp;

    GetMENU(obj, menup);
    GetITEM(item, itemp);
    set_current_item(menup->menu, itemp->item);
    return item;
}

/*
 * Document-method: Curses::Menu#set_win
 *
 * call-seq:
 *   set_win=(win)
 *
 * Set the window of the menu.
 */
static VALUE
menu_set_win(VALUE obj, VALUE win)
{
    struct menudata *menup;
    struct windata *winp;

    GetMENU(obj, menup);
    GetWINDOW(win, winp);
    set_menu_win(menup->menu, winp->window);
    return win;
}

/*
 * Document-method: Curses::Menu#set_sub
 *
 * call-seq:
 *   set_sub=(win)
 *
 * Set the subwindow of the menu.
 */
static VALUE
menu_set_sub(VALUE obj, VALUE win)
{
    struct menudata *menup;
    struct windata *winp;

    GetMENU(obj, menup);
    GetWINDOW(win, winp);
    set_menu_sub(menup->menu, winp->window);
    return win;
}

/*
 * Document-method: Curses::Menu#scale
 *
 * call-seq:
 *   scale
 *
 * Return the minimum rows and columns required for the subwindow of the menu.
 */
static VALUE
menu_scale(VALUE obj)
{
    struct menudata *menup;
    int error, rows, columns;

    GetMENU(obj, menup);
    error = scale_menu(menup->menu, &rows, &columns);
    check_curses_error(error);
    return rb_assoc_new(INT2NUM(rows), INT2NUM(columns));
}

/*
 * Document-method: Curses::Menu#set_format
 *
 * call-seq:
 *   set_format(rows, cols)
 *
 * Set the maximum size of the menu.
 */
static VALUE
menu_set_format(VALUE obj, VALUE rows, VALUE cols)
{
    struct menudata *menup;
    int error;

    GetMENU(obj, menup);
    error = set_menu_format(menup->menu, NUM2INT(rows), NUM2INT(cols));
    check_curses_error(error);
    return obj;
}

/*
 * Document-method: Curses::Menu#mark=
 *
 * call-seq:
 *   mark=(str)
 *
 * Set the mark string to distinguish the selected items
 */
static VALUE
menu_set_mark(VALUE obj, VALUE mark)
{
    struct menudata *menup;

    GetMENU(obj, menup);
    set_menu_mark(menup->menu, StringValueCStr(mark));

    return obj;
}

/*
 * Document-method: Curses::Menu#mark
 *
 * call-seq:
 *   mark
 *
 * Get the Menu's mark string
 */
static VALUE
menu_get_mark(VALUE obj)
{
    struct menudata *menup;
    const char *mark;

    GetMENU(obj, menup);
    mark = menu_mark(menup->menu);

    return rb_external_str_new_with_enc(mark, strlen(mark), terminal_encoding);
}

/*
 * Document-method: Curses::Menu#fore=
 *
 * call-seq:
 *   fore=(attr)
 *
 * Sets the foreground attribute of menu.
 * This is the highlight used for selected menu items.
 */
static VALUE
menu_set_fore(VALUE obj, VALUE attr)
{
    struct menudata *menup;

    GetMENU(obj, menup);
    set_menu_fore(menup->menu, NUM2CHTYPE(attr));

    return attr;
}

/*
 * Document-method: Curses::Menu#fore
 *
 * call-seq:
 *   fore
 *
 * Sets the foreground attribute of menu.
 * This is the highlight used for selected menu items.
 */
static VALUE
menu_get_fore(VALUE obj)
{
    struct menudata *menup;

    GetMENU(obj, menup);

    return CHTYPE2NUM(menu_fore(menup->menu));
}

/*
 * Document-method: Curses::Menu#set_back
 *
 * call-seq:
 *   set_back(attr)
 *
 * Get the background attribute of menu.
 */
static VALUE
menu_set_back(VALUE obj, VALUE attr)
{
    struct menudata *menup;

    GetMENU(obj, menup);
    CHTYPE2NUM(set_menu_back(menup->menu, NUM2CHTYPE(attr)));

    return attr;
}

/*
 * Document-method: Curses::Menu#back
 *
 * call-seq:
 *   back
 *
 * Get the background attribute of menu.
 */
static VALUE
menu_get_back(VALUE obj)
{
    struct menudata *menup;

    GetMENU(obj, menup);

    return CHTYPE2NUM(menu_back(menup->menu));
}

/*
 * Document-method: Curses::Menu#format
 *
 * call-seq:
 *   format
 *
 * Get the maximum size of the menu.
 */
static VALUE
menu_format_m(VALUE obj)
{
    struct menudata *menup;
    int rows, cols;

    GetMENU(obj, menup);
    menu_format(menup->menu, &rows, &cols);
    return rb_assoc_new(INT2NUM(rows), INT2NUM(cols));
}

/*
 * Document-method: Curses::Menu#set_opts
 *
 * call-seq:
 *   set_opts(opts)
 *
 * Set the option bits of the menu.
 */
static VALUE
menu_set_opts(VALUE obj, VALUE opts)
{
    struct menudata *menup;
    int error;

    GetMENU(obj, menup);
    error = set_menu_opts(menup->menu, NUM2INT(opts));
    check_curses_error(error);
    return obj;
}

/*
 * Document-method: Curses::Menu#opts_on
 *
 * call-seq:
 *   opts_on(opts)
 *
 * Turn on the option bits of the menu.
 */
static VALUE
menu_opts_on_m(VALUE obj, VALUE opts)
{
    struct menudata *menup;
    int error;

    GetMENU(obj, menup);
    error = menu_opts_on(menup->menu, NUM2INT(opts));
    check_curses_error(error);
    return obj;
}

/*
 * Document-method: Curses::Menu#opts_off
 *
 * call-seq:
 *   opts_off(opts)
 *
 * Turn off the option bits of the menu.
 */
static VALUE
menu_opts_off_m(VALUE obj, VALUE opts)
{
    struct menudata *menup;
    int error;

    GetMENU(obj, menup);
    error = menu_opts_off(menup->menu, NUM2INT(opts));
    check_curses_error(error);
    return obj;
}

/*
 * Document-method: Curses::Menu#opts
 *
 * call-seq:
 *   opts
 *
 * Get the current option bits of the menu.
 */
static VALUE
menu_opts_m(VALUE obj)
{
    struct menudata *menup;

    GetMENU(obj, menup);
    return INT2NUM(menu_opts(menup->menu));
}
#endif /* HAVE_MENU */

#ifdef HAVE_FORM
struct fielddata {
    FIELD *field;
};

NORETURN(static void no_field(void));
static void
no_field(void)
{
    rb_raise(rb_eRuntimeError, "already deleted field");
}

#define GetFIELD(obj, fieldp) do {\
    TypedData_Get_Struct((obj), struct fielddata, &fielddata_type, (fieldp));\
    if ((fieldp)->field == 0) no_field();\
} while (0)

static void
field_free(void *p)
{
    struct fielddata *fieldp = p;
    if (fieldp->field) free_field(fieldp->field);
    fieldp->field = 0;
    xfree(fieldp);
}

static size_t
field_memsize(const void *p)
{
    const struct fielddata *fieldp = p;
    size_t size = sizeof(*fieldp);
    if (!fieldp) return 0;
    if (fieldp->field) size += CURSES_SIZEOF_FIELD;
    return size;
}

static const rb_data_type_t fielddata_type = {
    "fielddata",
    {0, field_free, field_memsize,}
};

/* returns a Curses::Menu object */
static VALUE
field_s_allocate(VALUE class)
{
    struct fielddata *fieldp;

    return TypedData_Make_Struct(class, struct fielddata, &fielddata_type, fieldp);
}

/*
 * Document-method: Curses::Field.new
 *
 * call-seq:
 *   new(height, width, toprow, leftcol, offscreen, nbuffers)
 *
 * Construct a new Curses::Field.
 */
static VALUE
field_initialize(VALUE obj, VALUE height, VALUE width,
		 VALUE toprow, VALUE leftcol, VALUE offscreen, VALUE nbuffers)
{
    struct fielddata *fieldp;

    curses_init_screen(Qnil);
    TypedData_Get_Struct(obj, struct fielddata, &fielddata_type, fieldp);
    if (fieldp->field) {
	rb_raise(rb_eRuntimeError, "already initialized field");
    }
    fieldp->field = new_field(NUM2INT(height), NUM2INT(width),
			      NUM2INT(toprow), NUM2INT(leftcol),
			      NUM2INT(offscreen), NUM2INT(nbuffers));
    if (fieldp->field == NULL) {
	check_curses_error(errno);
    }

    return obj;
}

/*
 * Document-method: Curses::Field#set_buffer
 *
 * call-seq:
 *   set_buffer(buf, value)
 *
 * Set the numbered buffer of the field.
 */
static VALUE
field_set_buffer(VALUE obj, VALUE buf, VALUE value)
{
    struct fielddata *fieldp;

    GetFIELD(obj, fieldp);
    value = rb_str_export_to_enc(value, terminal_encoding);
    set_field_buffer(fieldp->field, NUM2INT(buf), StringValueCStr(value));

    return obj;
}

/*
 * Document-method: Curses::Field#buffer
 *
 * call-seq:
 *   buffer(buf)
 *
 * Get the numbered buffer of the field.
 */
static VALUE
field_buffer_m(VALUE obj, VALUE buf)
{
    struct fielddata *fieldp;
    char *s;

    GetFIELD(obj, fieldp);
    s = field_buffer(fieldp->field, NUM2INT(buf));
    return rb_external_str_new_with_enc(s, strlen(s), terminal_encoding);
}

/*
 * Document-method: Curses::Field#set_fore
 *
 * call-seq:
 *   set_fore(attr)
 *
 * Set the foreground attribute of the field.
 */
static VALUE
field_set_fore(VALUE obj, VALUE attr)
{
    struct fielddata *fieldp;

    GetFIELD(obj, fieldp);
    set_field_fore(fieldp->field, NUM2CHTYPE(attr));

    return attr;
}

/*
 * Document-method: Curses::Field#fore
 *
 * call-seq:
 *   fore
 *
 * Get the foreground attribute of the field.
 */
static VALUE
field_get_fore(VALUE obj)
{
    struct fielddata *fieldp;

    GetFIELD(obj, fieldp);
    return CHTYPE2NUM(field_fore(fieldp->field));
}

/*
 * Document-method: Curses::Field#set_back
 *
 * call-seq:
 *   set_back(attr)
 *
 * Set the background attribute of the field.
 */
static VALUE
field_set_back(VALUE obj, VALUE attr)
{
    struct fielddata *fieldp;

    GetFIELD(obj, fieldp);
    set_field_back(fieldp->field, NUM2CHTYPE(attr));

    return attr;
}

/*
 * Document-method: Curses::Field#back
 *
 * call-seq:
 *   back
 *
 * Get the background attribute of the field.
 */
static VALUE
field_get_back(VALUE obj)
{
    struct fielddata *fieldp;

    GetFIELD(obj, fieldp);
    return CHTYPE2NUM(field_back(fieldp->field));
}

/*
 * Document-method: Curses::Field#opts_on
 *
 * call-seq:
 *   opts_on(opts)
 *
 * Turn on the given option bits.
 */
static VALUE
field_opts_on_m(VALUE obj, VALUE opts)
{
    struct fielddata *fieldp;

    GetFIELD(obj, fieldp);
    field_opts_on(fieldp->field, NUM2INT(opts));

    return opts;
}

/*
 * Document-method: Curses::Field#opts_off
 *
 * call-seq:
 *   opts_off(opts)
 *
 * Turn off the given option bits.
 */
static VALUE
field_opts_off_m(VALUE obj, VALUE opts)
{
    struct fielddata *fieldp;

    GetFIELD(obj, fieldp);
    field_opts_off(fieldp->field, NUM2INT(opts));

    return opts;
}

/*
 * Document-method: Curses::Field#opts
 *
 * call-seq:
 *   opts
 *
 * Get the current option bits.
 */
static VALUE
field_opts_m(VALUE obj)
{
    struct fielddata *fieldp;

    GetFIELD(obj, fieldp);
    return INT2NUM(field_opts(fieldp->field));
}

static VALUE
field_height(VALUE obj)
{
    struct fielddata *fieldp;
    int error, val;

    GetFIELD(obj, fieldp);
    error = field_info(fieldp->field, &val, NULL, NULL, NULL, NULL, NULL);
    check_curses_error(error);
    return INT2NUM(val);
}

static VALUE
field_width(VALUE obj)
{
    struct fielddata *fieldp;
    int error, val;

    GetFIELD(obj, fieldp);
    error = field_info(fieldp->field, NULL, &val, NULL, NULL, NULL, NULL);
    check_curses_error(error);
    return INT2NUM(val);
}

static VALUE
field_toprow(VALUE obj)
{
    struct fielddata *fieldp;
    int error, val;

    GetFIELD(obj, fieldp);
    error = field_info(fieldp->field, NULL, NULL, &val, NULL, NULL, NULL);
    check_curses_error(error);
    return INT2NUM(val);
}

static VALUE
field_leftcol(VALUE obj)
{
    struct fielddata *fieldp;
    int error, val;

    GetFIELD(obj, fieldp);
    error = field_info(fieldp->field, NULL, NULL, NULL, &val, NULL, NULL);
    check_curses_error(error);
    return INT2NUM(val);
}

static VALUE
field_offscreen(VALUE obj)
{
    struct fielddata *fieldp;
    int error, val;

    GetFIELD(obj, fieldp);
    error = field_info(fieldp->field, NULL, NULL, NULL, NULL, &val, NULL);
    check_curses_error(error);
    return INT2NUM(val);
}

static VALUE
field_nbuffers(VALUE obj)
{
    struct fielddata *fieldp;
    int error, val;

    GetFIELD(obj, fieldp);
    error = field_info(fieldp->field, NULL, NULL, NULL, NULL, NULL, &val);
    check_curses_error(error);
    return INT2NUM(val);
}

static VALUE
field_dynamic_height(VALUE obj)
{
    struct fielddata *fieldp;
    int error, val;

    GetFIELD(obj, fieldp);
    error = dynamic_field_info(fieldp->field, &val, NULL, NULL);
    check_curses_error(error);
    return INT2NUM(val);
}

static VALUE
field_dynamic_width(VALUE obj)
{
    struct fielddata *fieldp;
    int error, val;

    GetFIELD(obj, fieldp);
    error = dynamic_field_info(fieldp->field, NULL, &val, NULL);
    check_curses_error(error);
    return INT2NUM(val);
}

static VALUE
field_max(VALUE obj)
{
    struct fielddata *fieldp;
    int error, val;

    GetFIELD(obj, fieldp);
    error = dynamic_field_info(fieldp->field, NULL, NULL, &val);
    check_curses_error(error);
    return INT2NUM(val);
}

static VALUE
field_set_max(VALUE obj, VALUE max)
{
    struct fielddata *fieldp;
    int error;

    GetFIELD(obj, fieldp);
    error = set_max_field(fieldp->field, NUM2INT(max));
    check_curses_error(error);
    return max;
}

#define TYPE_CODE_ALPHA 1
#define TYPE_CODE_ALNUM 2
#define TYPE_CODE_ENUM 3
#define TYPE_CODE_INTEGER 4
#define TYPE_CODE_NUMERIC 5
#define TYPE_CODE_REGEXP 6

static VALUE
field_set_type(int argc, VALUE *argv, VALUE obj)
{
    struct fielddata *fieldp;
    VALUE type;
    int type_code;
    int error;

    if (argc < 1) {
	rb_raise(rb_eArgError,
                 "wrong number of arguments (given %d, expected 1)", argc);
    }
    type_code = NUM2INT(argv[0]);
    GetFIELD(obj, fieldp);
    switch (type_code) {
    case TYPE_CODE_ALPHA:
        {
            VALUE width;
	    rb_scan_args(argc, argv, "11", &type, &width);
	    error = set_field_type(fieldp->field, TYPE_ALPHA,
                                   NIL_P(width) ? 0 : NUM2INT(width));
	}
        break;
    case TYPE_CODE_ALNUM:
        {
            VALUE width;
	    rb_scan_args(argc, argv, "11", &type, &width);
	    error = set_field_type(fieldp->field, TYPE_ALNUM,
                                   NIL_P(width) ? 0 : NUM2INT(width));
	}
        break;
#if 0
    case TYPE_CODE_ENUM:
        {
            /* TODO: consider how valuelist should be allocated? */
	}
        break;
#endif
    case TYPE_CODE_INTEGER:
        {
            VALUE padding, vmin, vmax;
	    rb_scan_args(argc, argv, "13", &type, &padding, &vmin, &vmax);
	    error = set_field_type(fieldp->field, TYPE_INTEGER,
                                   NIL_P(padding) ? 0 : NUM2INT(padding),
                                   NIL_P(vmin) ? INT_MIN : NUM2INT(vmin),
                                   NIL_P(vmax) ? INT_MAX : NUM2INT(vmax));
	}
        break;
    case TYPE_CODE_NUMERIC:
        {
            VALUE padding, vmin, vmax;
	    rb_scan_args(argc, argv, "13", &type, &padding, &vmin, &vmax);
	    error = set_field_type(fieldp->field, TYPE_INTEGER,
                                   NIL_P(padding) ? 0 : NUM2INT(padding),
                                   NIL_P(vmin) ? INT_MIN : NUM2INT(vmin),
                                   NIL_P(vmax) ? INT_MAX : NUM2INT(vmax));
	}
        break;
#if 0
    case TYPE_CODE_REGEXP:
        {
            /* TODO: consider how regexp should be allocated? */
	}
        break;
#endif
    default:
	rb_raise(rb_eArgError, "unknwon type: %d", type_code);
	break;
    }
    check_curses_error(error);
    return obj;
}

struct formdata {
    FORM *form;
    VALUE fields;
};

NORETURN(static void no_form(void));
static void
no_form(void)
{
    rb_raise(rb_eRuntimeError, "already deleted form");
}

#define GetFORM(obj, formp) do {\
    TypedData_Get_Struct((obj), struct formdata, &formdata_type, (formp));\
    if ((formp)->form == 0) no_form();\
} while (0)

static void
form_gc_mark(void *p)
{
    struct formdata *formp = p;

    rb_gc_mark(formp->fields);
}    

static void
form_free(void *p)
{
    struct formdata *formp = p;
    FIELD **fields = form_fields(formp->form);
    if (formp->form) free_form(formp->form);
    xfree(fields);
    formp->form = 0;
    formp->fields = Qnil;
    xfree(formp);
}

static size_t
form_memsize(const void *p)
{
    const struct formdata *formp = p;
    size_t size = sizeof(*formp);
    if (!formp) return 0;
    if (formp->form) size += CURSES_SIZEOF_FORM;
    return size;
}

static const rb_data_type_t formdata_type = {
    "formdata",
    {form_gc_mark, form_free, form_memsize,}
};

/* returns a Curses::Form object */
static VALUE
form_s_allocate(VALUE class)
{
    struct formdata *formp;

    return TypedData_Make_Struct(class, struct formdata, &formdata_type, formp);
}

/*
 * Document-method: Curses::Form.new
 *
 * call-seq:
 *   new(fields)
 *
 * Construct a new Curses::Form.
 */
static VALUE
form_initialize(VALUE obj, VALUE fields)
{
    struct formdata *formp;
    FIELD **form_fields;
    int i;

    Check_Type(fields, T_ARRAY);
    curses_init_screen(Qnil);
    TypedData_Get_Struct(obj, struct formdata, &formdata_type, formp);
    if (formp->form) {
	rb_raise(rb_eRuntimeError, "already initialized form");
    }
    formp->fields = rb_ary_new();
    form_fields = ALLOC_N(FIELD *, RARRAY_LEN(fields) + 1);
    for (i = 0; i < RARRAY_LEN(fields); i++) {
	VALUE field = RARRAY_AREF(fields, i);
	struct fielddata *fieldp;

	GetFIELD(field, fieldp);
	form_fields[i] = fieldp->field;
	rb_ary_push(formp->fields, field);
    }
    form_fields[RARRAY_LEN(fields)] = NULL;
    formp->form = new_form(form_fields);
    if (formp->form == NULL) {
	check_curses_error(errno);
    }

    return obj;
}

/*
 * Document-method: Curses::Form#post
 *
 * call-seq:
 *   post
 *
 * Post the form.
 */
static VALUE
form_post(VALUE obj)
{
    struct formdata *formp;
    int error;

    GetFORM(obj, formp);
    error = post_form(formp->form);
    check_curses_error(error);

    return obj;
}

/*
 * Document-method: Curses::Form#unpost
 *
 * call-seq:
 *   unpost
 *
 * Unpost the form.
 */
static VALUE
form_unpost(VALUE obj)
{
    struct formdata *formp;
    int error;

    GetFORM(obj, formp);
    error = unpost_form(formp->form);
    check_curses_error(error);

    return obj;
}

/*
 * Document-method: Curses::Form#driver
 *
 * call-seq:
 *   driver(command)
 *
 * Perform the command on the form.
 */
static VALUE
form_driver_m(VALUE obj, VALUE command)
{
    struct formdata *formp;
    int error, c;

    GetFORM(obj, formp);
    if (FIXNUM_P(command)) {
	c = NUM2INT(command);
    }
    else {
	ID id_ord;

	StringValue(command);
	CONST_ID(id_ord, "ord");
	c = NUM2INT(rb_funcall(command, id_ord, 0));
    }
#ifdef HAVE_FORM_DRIVER_W
    error = form_driver_w(formp->form,
			  FIXNUM_P(command) ? KEY_CODE_YES : OK,
			  c);
#else
    error = form_driver(formp->form, c);
#endif
    check_curses_error(error);

    return obj;
}

/*
 * Document-method: Curses::Form#set_win
 *
 * call-seq:
 *   set_win=(win)
 *
 * Set the window of the form.
 */
static VALUE
form_set_win(VALUE obj, VALUE win)
{
    struct formdata *formp;
    struct windata *winp;

    GetFORM(obj, formp);
    GetWINDOW(win, winp);
    set_form_win(formp->form, winp->window);
    return win;
}

/*
 * Document-method: Curses::Form#set_sub
 *
 * call-seq:
 *   set_sub=(win)
 *
 * Set the subwindow of the form.
 */
static VALUE
form_set_sub(VALUE obj, VALUE win)
{
    struct formdata *formp;
    struct windata *winp;

    GetFORM(obj, formp);
    GetWINDOW(win, winp);
    set_form_sub(formp->form, winp->window);
    return win;
}

/*
 * Document-method: Curses::Form#scale
 *
 * call-seq:
 *   scale
 *
 * Return the minimum rows and columns required for the subwindow of the form.
 */
static VALUE
form_scale(VALUE obj)
{
    struct formdata *formp;
    int error, rows, columns;

    GetFORM(obj, formp);
    error = scale_form(formp->form, &rows, &columns);
    check_curses_error(error);
    return rb_assoc_new(INT2NUM(rows), INT2NUM(columns));
}

#endif /* HAVE_FORM */

/*
 * Document-method: Curses.keyboard_encoding
 * call-seq: Curses.keyboard_encoding
 *
 * Returns the encoding for keyboard input.
 */
static VALUE
curses_get_keyboard_encoding(VALUE obj)
{
    return rb_enc_from_encoding(keyboard_encoding);
}

/*
 * Document-method: Curses.keyboard_encoding=
 * call-seq: Curses.keyboard_encoding = encoding
 *
 * Sets the encoding for keyboard input.
 */
static VALUE
curses_set_keyboard_encoding(VALUE obj, VALUE enc)
{
    keyboard_encoding = rb_to_encoding(enc);
    return enc;
}

/*
 * Document-method: Curses.terminal_encoding
 * call-seq: Curses.terminal_encoding
 *
 * Returns the encoding for terminal output.
 */
static VALUE
curses_get_terminal_encoding(VALUE obj)
{
    return rb_enc_from_encoding(terminal_encoding);
}

/*
 * Document-method: Curses.terminal_encoding=
 * call-seq: Curses.terminal_encoding = encoding
 *
 * Sets the encoding for terminal output.
 */
static VALUE
curses_set_terminal_encoding(VALUE obj, VALUE enc)
{
    terminal_encoding = rb_to_encoding(enc);
    return enc;
}

/*
 * Document-method: Curses.unget_char
 * call-seq: unget_char(ch)
 *
 * Places +ch+ back onto the input queue to be returned by
 * the next call to Curses.get_char etc.
 *
 * There is just one input queue for all windows.
 */
static VALUE
curses_unget_char(VALUE obj, VALUE ch)
{
    ID id_ord;
    unsigned int c;

    curses_stdscr();
    if (FIXNUM_P(ch)) {
	ungetch(NUM2UINT(ch));
    }
    else {
	StringValue(ch);
	CONST_ID(id_ord, "ord");
	c = NUM2UINT(rb_funcall(ch, id_ord, 0));
#ifdef HAVE_UNGET_WCH
	unget_wch(c);
#else
	if (c > 0xff) {
	    rb_raise(rb_eRangeError, "Out of range: %u", c);
	}
	ungetch(c);
#endif
    }
    return Qnil;
}

static VALUE
keyboard_uint_chr(unsigned int ch)
{
    return rb_enc_uint_chr(ch, keyboard_encoding);
}

#if defined(HAVE_GET_WCH) || defined(HAVE_WGET_WCH)
static VALUE
key_code_value(unsigned int ch)
{
#ifdef CTL_FSLASH
    if (ch == CTL_FSLASH) {
	return keyboard_uint_chr(0x1F);
    }
#endif
    return UINT2NUM(ch);
}
#endif

#ifdef HAVE_GET_WCH
struct get_wch_arg {
    int retval;
    wint_t ch;
};

static void *
get_wch_func(void *_arg)
{
    struct get_wch_arg *arg = (struct get_wch_arg *) _arg;
    arg->retval = get_wch(&arg->ch);
    return 0;
}
#endif

/*
 * Document-method: Curses.get_char
 *
 * Read and returns a character or function key from the window.
 * A single or multibyte character is represented by a String, and
 * a function key is represented by an Integer.
 * Returns nil if no input is ready.
 *
 * See Curses::Key to all the function KEY_* available
 *
 */
static VALUE
curses_get_char(VALUE obj)
{
#ifdef HAVE_GET_WCH
    struct get_wch_arg arg;

    curses_stdscr();
    rb_thread_call_without_gvl(get_wch_func, &arg, RUBY_UBF_IO, 0);
    switch (arg.retval) {
    case OK:
	return keyboard_uint_chr(arg.ch);
    case KEY_CODE_YES:
	return key_code_value(arg.ch);
    }
    return Qnil;
#else
    int c;

    curses_stdscr();
    rb_thread_call_without_gvl(getch_func, &c, RUBY_UBF_IO, 0);
    if (c > 0xff) {
	return INT2NUM(c);
    }
    else if (c >= 0) {
	return keyboard_uint_chr(c);
    }
    else {
	return Qnil;
    }
#endif
}


#ifdef HAVE_WGET_WCH
struct wget_wch_arg {
    WINDOW *win;
    int retval;
    wint_t ch;
};

static void *
wget_wch_func(void *_arg)
{
    struct wget_wch_arg *arg = (struct wget_wch_arg *) _arg;
    arg->retval = wget_wch(arg->win, &arg->ch);
    return 0;
}
#endif

/*
 * Document-method: Curses::Window.get_char
 *
 * Read and returns a character or function key from the window.
 * A single or multibyte character is represented by a String, and
 * a function key is represented by an Integer.
 * Returns nil if no input is ready.
 *
 * See Curses::Key to all the function KEY_* available
 *
 */
static VALUE
window_get_char(VALUE obj)
{
#ifdef HAVE_WGET_WCH
    struct windata *winp;
    struct wget_wch_arg arg;

    GetWINDOW(obj, winp);
    arg.win = winp->window;
    rb_thread_call_without_gvl(wget_wch_func, &arg, RUBY_UBF_IO, 0);
    switch (arg.retval) {
    case OK:
	return keyboard_uint_chr(arg.ch);
    case KEY_CODE_YES:
	return key_code_value(arg.ch);
    }
    return Qnil;
#else
    struct windata *winp;
    struct wgetch_arg arg;

    GetWINDOW(obj, winp);
    arg.win = winp->window;
    rb_thread_call_without_gvl(wgetch_func, (void *)&arg, RUBY_UBF_IO, 0);
    if (arg.c > 0xff) {
	return INT2NUM(arg.c);
    }
    else if (arg.c >= 0) {
	return keyboard_uint_chr(arg.c);
    }
    else {
	return Qnil;
    }
#endif
}

#ifdef HAVE_PDC_GET_KEY_MODIFIERS
static VALUE
curses_get_key_modifiers(VALUE obj)
{
    return ULONG2NUM(PDC_get_key_modifiers());
}

static VALUE
curses_return_key_modifiers(VALUE obj, VALUE flag)
{
    return INT2NUM(PDC_return_key_modifiers(RTEST(flag)));
}

static VALUE
curses_save_key_modifiers(VALUE obj, VALUE flag)
{
    return INT2NUM(PDC_save_key_modifiers(RTEST(flag)));
}
#endif

/*------------------------- Initialization -------------------------*/

/*
 * Document-module: Curses
 *
 * == Description
 * An implementation of the CRT screen handling and optimization library.
 *
 * == Structures and such
 *
 * === Classes
 *
 * * Curses::Window - class with the means to draw a window or box
 * * Curses::MouseEvent - class for collecting mouse events
 *
 * === Modules
 *
 * Curses:: The curses implementation
 * Curses::Key:: Collection of constants for keypress events
 *
 * == Examples
 *
 * * hello.rb
 *     :include: ../../sample/hello.rb
 *
 *
 * * rain.rb
 *     :include: ../../sample/rain.rb
 *
 *
 */
void
Init_curses(void)
{
#ifdef HAVE_GET_WCH
    keyboard_encoding = rb_locale_encoding();
#else
    keyboard_encoding = rb_ascii8bit_encoding();
#endif
    terminal_encoding = rb_locale_encoding();

    mCurses    = rb_define_module("Curses");

    /*
     * Document-module: Curses::Key
     *
     *
     * a container for the KEY_* values.
     *
     * See also system manual for getch(3)
     *
     */
    mKey       = rb_define_module_under(mCurses, "Key");

    rb_gc_register_address(&rb_stdscr);

#ifdef USE_MOUSE
    /*
     * Document-class: Curses::MouseEvent
     *
     * == Description
     *
     * Curses::MouseEvent
     *
     * == Example
     *
     * * mouse.rb
     *     :include: ../../sample/mouse.rb
     *
     */
    cMouseEvent = rb_define_class_under(mCurses,"MouseEvent",rb_cObject);
    rb_undef_method(CLASS_OF(cMouseEvent),"new");
    rb_define_method(cMouseEvent, "eid", curs_mouse_id, 0);
    rb_define_method(cMouseEvent, "x", curs_mouse_x, 0);
    rb_define_method(cMouseEvent, "y", curs_mouse_y, 0);
    rb_define_method(cMouseEvent, "z", curs_mouse_z, 0);
    rb_define_method(cMouseEvent, "bstate", curs_mouse_bstate, 0);
#endif /* USE_MOUSE */

    rb_define_module_function(mCurses, "ESCDELAY=", curses_escdelay_set, 1);
    rb_define_module_function(mCurses, "ESCDELAY", curses_escdelay_get, 0);
    rb_define_module_function(mCurses, "TABSIZE", curses_tabsize_get, 0);
    rb_define_module_function(mCurses, "TABSIZE=", curses_tabsize_set, 1);

    rb_define_module_function(mCurses, "use_default_colors", curses_use_default_colors, 0);
    rb_define_module_function(mCurses, "assume_default_colors", curses_assume_default_colors, 2);
    rb_define_module_function(mCurses, "init_screen", curses_init_screen, 0);
    rb_define_module_function(mCurses, "close_screen", curses_close_screen, 0);
    rb_define_module_function(mCurses, "closed?", curses_closed, 0);
    rb_define_module_function(mCurses, "stdscr", curses_init_screen, 0);
    rb_define_module_function(mCurses, "refresh", curses_refresh, 0);
    rb_define_module_function(mCurses, "doupdate", curses_doupdate, 0);
    rb_define_module_function(mCurses, "clear", curses_clear, 0);
    rb_define_module_function(mCurses, "erase", curses_erase, 0);
    rb_define_module_function(mCurses, "clrtoeol", curses_clrtoeol, 0);
    rb_define_module_function(mCurses, "echo", curses_echo, 0);
    rb_define_module_function(mCurses, "noecho", curses_noecho, 0);
    rb_define_module_function(mCurses, "raw", curses_raw, 0);
    rb_define_module_function(mCurses, "noraw", curses_noraw, 0);
    rb_define_module_function(mCurses, "cbreak", curses_cbreak, 0);
    rb_define_module_function(mCurses, "nocbreak", curses_nocbreak, 0);
    rb_define_module_function(mCurses, "crmode", curses_cbreak, 0);
    rb_define_module_function(mCurses, "nocrmode", curses_nocbreak, 0);
    rb_define_module_function(mCurses, "nl", curses_nl, 0);
    rb_define_module_function(mCurses, "nonl", curses_nonl, 0);
    rb_define_module_function(mCurses, "flushinp", curses_flushinp, 0);
    rb_define_module_function(mCurses, "beep", curses_beep, 0);
    rb_define_module_function(mCurses, "flash", curses_flash, 0);
    rb_define_module_function(mCurses, "ungetch", curses_ungetch, 1);
    rb_define_module_function(mCurses, "setpos", curses_setpos, 2);
    rb_define_module_function(mCurses, "standout", curses_standout, 0);
    rb_define_module_function(mCurses, "standend", curses_standend, 0);
    rb_define_module_function(mCurses, "inch", curses_inch, 0);
    rb_define_module_function(mCurses, "addch", curses_addch, 1);
    rb_define_module_function(mCurses, "insch", curses_insch, 1);
    rb_define_module_function(mCurses, "addstr", curses_addstr, 1);
    rb_define_module_function(mCurses, "getch", curses_getch, 0);
    rb_define_module_function(mCurses, "getstr", curses_getstr, 0);
    rb_define_module_function(mCurses, "delch", curses_delch, 0);
    rb_define_module_function(mCurses, "deleteln", curses_deleteln, 0);
    rb_define_module_function(mCurses, "insertln", curses_insertln, 0);
    rb_define_module_function(mCurses, "keyname", curses_keyname, 1);
    rb_define_module_function(mCurses, "lines", curses_lines, 0);
    rb_define_module_function(mCurses, "cols", curses_cols, 0);
    rb_define_module_function(mCurses, "curs_set", curses_curs_set, 1);
    rb_define_module_function(mCurses, "scrl", curses_scrl, 1);
    rb_define_module_function(mCurses, "setscrreg", curses_setscrreg, 2);
    rb_define_module_function(mCurses, "attroff", curses_attroff, 1);
    rb_define_module_function(mCurses, "attron", curses_attron, 1);
    rb_define_module_function(mCurses, "attrset", curses_attrset, 1);
    rb_define_module_function(mCurses, "bkgdset", curses_bkgdset, 1);
    rb_define_module_function(mCurses, "bkgd", curses_bkgd, 1);
    rb_define_module_function(mCurses, "resizeterm", curses_resizeterm, 2);
    rb_define_module_function(mCurses, "resize", curses_resizeterm, 2);
#ifdef USE_COLOR
    rb_define_module_function(mCurses, "start_color", curses_start_color, 0);
    rb_define_module_function(mCurses, "init_pair", curses_init_pair, 3);
    rb_define_module_function(mCurses, "init_color", curses_init_color, 4);
    rb_define_module_function(mCurses, "has_colors?", curses_has_colors, 0);
    rb_define_module_function(mCurses, "can_change_color?",
			      curses_can_change_color, 0);
    rb_define_module_function(mCurses, "colors", curses_colors, 0);
    rb_define_module_function(mCurses, "color_content", curses_color_content, 1);
    rb_define_module_function(mCurses, "color_pairs", curses_color_pairs, 0);
    rb_define_module_function(mCurses, "pair_content", curses_pair_content, 1);
    rb_define_module_function(mCurses, "color_pair", curses_color_pair, 1);
    rb_define_module_function(mCurses, "pair_number", curses_pair_number, 1);
    rb_define_module_function(mCurses, "support_extended_colors?", curses_support_extended_colors, 0);
    rb_define_module_function(mCurses, "reset_color_pairs", curses_reset_color_pairs, 0);
#endif /* USE_COLOR */
#ifdef USE_MOUSE
    rb_define_module_function(mCurses, "getmouse", curses_getmouse, 0);
    rb_define_module_function(mCurses, "ungetmouse", curses_ungetmouse, 1);
    rb_define_module_function(mCurses, "mouseinterval", curses_mouseinterval, 1);
    rb_define_module_function(mCurses, "mousemask", curses_mousemask, 1);
#endif /* USE_MOUSE */

    rb_define_module_function(mCurses, "timeout=", curses_timeout, 1);
    rb_define_module_function(mCurses, "def_prog_mode", curses_def_prog_mode, 0);
    rb_define_module_function(mCurses, "reset_prog_mode", curses_reset_prog_mode, 0);
    rb_define_module_function(mCurses, "keyboard_encoding", curses_get_keyboard_encoding, 0);
    rb_define_module_function(mCurses, "keyboard_encoding=", curses_set_keyboard_encoding, 1);
    rb_define_module_function(mCurses, "terminal_encoding", curses_get_terminal_encoding, 0);
    rb_define_module_function(mCurses, "terminal_encoding=", curses_set_terminal_encoding, 1);
    rb_define_module_function(mCurses, "unget_char", curses_unget_char, 1);
    rb_define_module_function(mCurses, "get_char", curses_get_char, 0);
#ifdef HAVE_PDC_GET_KEY_MODIFIERS
    rb_define_module_function(mCurses, "get_key_modifiers", curses_get_key_modifiers, 0);
    rb_define_module_function(mCurses, "return_key_modifiers", curses_return_key_modifiers, 1);
    rb_define_module_function(mCurses, "save_key_modifiers", curses_save_key_modifiers, 1);
#endif

    {
        VALUE version;
#if defined(HAVE_FUNC_CURSES_VERSION)
        /* ncurses and PDcurses */
        version = rb_str_new2(curses_version());
#elif defined(HAVE_VAR_CURSES_VERSION)
        /* SVR4 curses has an undocumented and undeclared variable, curses_version.
         * It contains a string, "SVR4".  */
        RUBY_EXTERN char *curses_version;
        version = rb_sprintf("curses (%s)", curses_version);
#else
        /* BSD curses, perhaps.  NetBSD 5 still use it. */
        version = rb_str_new2("curses (unknown)");
#endif
        /*
         * Identifies curses library version.
         *
         * - "ncurses 5.9.20110404"
         * - "PDCurses 3.4 - Public Domain 2008"
         * - "curses (SVR4)" (System V curses)
         * - "curses (unknown)" (The original BSD curses?  NetBSD maybe.)
         *
         */
        rb_define_const(mCurses, "VERSION", version);
    }

#ifdef HAVE_NEWTERM
    /*
     * Document-class: Curses::Screen
     *
     * == Description
     *
     * A Screen represents a terminal.
     * A program that outputs to more than one terminal should create a Screen
     *  for each terminal instead of calling Curses.init_screen.
     *
     * == Usage
     *
     *   require "curses"
     *
     *   screen = Screen.new(STDOUT, STDIN, "xterm")
     *   screen.set_term
     *   
     *   Curses.addstr("Hit any key")
     *   Curses.refresh
     *   Curses.getch
     *   Curses.close_screen
     */
    cScreen = rb_define_class_under(mCurses, "Screen", rb_cObject);
    rb_define_alloc_func(cScreen, screen_s_allocate);
    rb_define_method(cScreen, "initialize", screen_initialize, -1);
    rb_define_method(cScreen, "set_term", screen_set_term, 0);
#endif

    /*
     * Document-class: Curses::Window
     *
     * == Description
     *
     * The means by which to create and manage frames or windows.
     * While there may be more than one window at a time, only one window
     * will receive input.
     *
     * == Usage
     *
     *   require "curses"
     *
     *   Curses.init_screen
     *
     *   my_str = "LOOK! PONIES!"
     *
     *   height, width = 12, my_str.length + 10
     *   top, left = (Curses.lines - height) / 2, (Curses.cols - width) / 2
     *   bwin = Curses::Window.new(height, width, top, left)
     *   bwin.box("\\", "/")
     *   bwin.refresh
     *
     *   win = bwin.subwin(height - 4, width - 4, top + 2, left + 2)
     *   win.setpos(2, 3)
     *   win.addstr(my_str)
     *   # or even
     *   win << "\nOH REALLY?"
     *   win << "\nYES!! " + my_str
     *   win.refresh
     *   win.getch
     *   win.close
     *
     */
    cWindow = rb_define_class_under(mCurses, "Window", rb_cObject);
    rb_define_alloc_func(cWindow, window_s_allocate);
    rb_define_method(cWindow, "initialize", window_initialize, 4);
    rb_define_method(cWindow, "subwin", window_subwin, 4);
    rb_define_method(cWindow, "derwin", window_derwin, 4);
    rb_define_method(cWindow, "close", window_close, 0);
    rb_define_method(cWindow, "clear", window_clear, 0);
    rb_define_method(cWindow, "erase", window_erase, 0);
    rb_define_method(cWindow, "clrtoeol", window_clrtoeol, 0);
    rb_define_method(cWindow, "refresh", window_refresh, 0);
    rb_define_method(cWindow, "noutrefresh", window_noutrefresh, 0);
    rb_define_method(cWindow, "redraw", window_redraw, 0);
    rb_define_method(cWindow, "touch", window_touch, 0);
    rb_define_method(cWindow, "untouch", window_untouch, 0);
    rb_define_method(cWindow, "touched?", window_touched, 0);
    rb_define_method(cWindow, "touch_line", window_touch_line, -1);
    rb_define_method(cWindow, "line_touched?", window_line_touched, 1);
    rb_define_method(cWindow, "box", window_box, -1);
    rb_define_method(cWindow, "move", window_move, 2);
    rb_define_method(cWindow, "move_relative", window_move_relative, 2);
    rb_define_method(cWindow, "setpos", window_setpos, 2);
#if defined(USE_COLOR) && ((defined(HAVE_WATTR_SET) && defined(HAVE_WATTR_GET)) || defined(HAVE_WCOLOR_SET))
    rb_define_method(cWindow, "color_set", window_color_set, 1);
#endif
    rb_define_method(cWindow, "cury", window_cury, 0);
    rb_define_method(cWindow, "curx", window_curx, 0);
    rb_define_method(cWindow, "maxy", window_maxy, 0);
    rb_define_method(cWindow, "maxx", window_maxx, 0);
    rb_define_method(cWindow, "begy", window_begy, 0);
    rb_define_method(cWindow, "begx", window_begx, 0);
    rb_define_method(cWindow, "standout", window_standout, 0);
    rb_define_method(cWindow, "standend", window_standend, 0);
    rb_define_method(cWindow, "inch", window_inch, 0);
    rb_define_method(cWindow, "addch", window_addch, 1);
    rb_define_method(cWindow, "insch", window_insch, 1);
    rb_define_method(cWindow, "addstr", window_addstr, 1);
    rb_define_method(cWindow, "<<", window_addstr2, 1);
    rb_define_method(cWindow, "getch", window_getch, 0);
    rb_define_method(cWindow, "getstr", window_getstr, 0);
    rb_define_method(cWindow, "delch", window_delch, 0);
    rb_define_method(cWindow, "deleteln", window_deleteln, 0);
    rb_define_method(cWindow, "insertln", window_insertln, 0);
    rb_define_method(cWindow, "scroll", window_scroll, 0);
    rb_define_method(cWindow, "scrollok", window_scrollok, 1);
    rb_define_method(cWindow, "idlok", window_idlok, 1);
    rb_define_method(cWindow, "setscrreg", window_setscrreg, 2);
    rb_define_method(cWindow, "scrl", window_scrl, 1);
    rb_define_method(cWindow, "resize", window_resize, 2);
    rb_define_method(cWindow, "keypad", window_keypad, 1);
    rb_define_method(cWindow, "keypad=", window_keypad, 1);

    rb_define_method(cWindow, "attroff", window_attroff, 1);
    rb_define_method(cWindow, "attron", window_attron, 1);
    rb_define_method(cWindow, "attrset", window_attrset, 1);
#ifdef HAVE_WATTR_SET
    rb_define_method(cWindow, "attr_set", window_attr_set, 2);
#endif
#ifdef HAVE_WATTR_GET
    rb_define_method(cWindow, "attr_get", window_attr_get, 0);
#endif
    rb_define_method(cWindow, "bkgdset", window_bkgdset, 1);
    rb_define_method(cWindow, "bkgd", window_bkgd, 1);
    rb_define_method(cWindow, "getbkgd", window_getbkgd, 0);
    rb_define_method(cWindow, "chgat", window_chgat, 2);

    rb_define_method(cWindow, "nodelay=", window_nodelay, 1);
    rb_define_method(cWindow, "timeout=", window_timeout, 1);

    rb_define_method(cWindow, "get_char", window_get_char, 0);

#ifdef HAVE_NEWPAD
    /*
     * Document-class: Curses::Pad
     *
     * == Description
     *
     * A Pad is like a Window but allows for scrolling of contents that cannot
     * fit on the screen.  Pads do not refresh automatically, use Pad#refresh
     * or Pad#noutrefresh instead.
     *
     */
    cPad = rb_define_class_under(mCurses, "Pad", cWindow);
    /* inherits alloc_func from cWindow */
    rb_define_method(cPad, "initialize", pad_initialize, 2);
    rb_define_method(cPad, "subpad", pad_subpad, 4);
    rb_define_method(cPad, "refresh", pad_refresh, 6);
    rb_define_method(cPad, "noutrefresh", pad_noutrefresh, 6);
    rb_undef_method(cPad, "subwin");
#endif

#ifdef HAVE_MENU
    cItem = rb_define_class_under(mCurses, "Item", rb_cObject);
    rb_define_alloc_func(cItem, item_s_allocate);
    rb_define_method(cItem, "initialize", item_initialize, 2);
    rb_define_method(cItem, "==", item_eq, 1);
    rb_define_method(cItem, "name", item_name_m, 0);
    rb_define_method(cItem, "description", item_description_m, 0);
    rb_define_method(cItem, "set_opts", item_set_opts, 1);
    rb_define_method(cItem, "opts_on", item_opts_on_m, 1);
    rb_define_method(cItem, "opts_off", item_opts_off_m, 1);
    rb_define_method(cItem, "opts", item_opts_m, 0);

    cMenu = rb_define_class_under(mCurses, "Menu", rb_cObject);
    rb_define_alloc_func(cMenu, menu_s_allocate);
    rb_define_method(cMenu, "initialize", menu_initialize, 1);
    rb_define_method(cMenu, "post", menu_post, 0);
    rb_define_method(cMenu, "unpost", menu_unpost, 0);
    rb_define_method(cMenu, "driver", menu_driver_m, 1);
    rb_define_method(cMenu, "item_count", menu_item_count, 0);
    rb_define_method(cMenu, "items", menu_get_items, 0);
    rb_define_method(cMenu, "items=", menu_set_items, 1);
    rb_define_method(cMenu, "current_item", menu_get_current_item, 0);
    rb_define_method(cMenu, "current_item=", menu_set_current_item, 1);
    rb_define_method(cMenu, "set_win", menu_set_win, 1);
    rb_define_method(cMenu, "set_sub", menu_set_sub, 1);
    rb_define_method(cMenu, "scale", menu_scale, 0);
    rb_define_method(cMenu, "set_format", menu_set_format, 2);
    rb_define_method(cMenu, "format", menu_format_m, 0);
    rb_define_method(cMenu, "mark=", menu_set_mark, 1);
    rb_define_method(cMenu, "mark", menu_get_mark, 0);
    rb_define_method(cMenu, "fore=", menu_set_fore, 1);
    rb_define_method(cMenu, "fore", menu_get_fore, 0);
    rb_define_method(cMenu, "back=", menu_set_back, 1);
    rb_define_method(cMenu, "back", menu_get_back, 0);
    rb_define_method(cMenu, "set_opts", menu_set_opts, 1);
    rb_define_method(cMenu, "opts_on", menu_opts_on_m, 1);
    rb_define_method(cMenu, "opts_off", menu_opts_off_m, 1);
    rb_define_method(cMenu, "opts", menu_opts_m, 0);
#endif

#ifdef HAVE_FORM
    cField = rb_define_class_under(mCurses, "Field", rb_cObject);
    rb_define_alloc_func(cField, field_s_allocate);
    rb_define_method(cField, "initialize", field_initialize, 6);
    rb_define_method(cField, "set_buffer", field_set_buffer, 2);
    rb_define_method(cField, "buffer", field_buffer_m, 1);
    rb_define_method(cField, "set_fore", field_set_fore, 1);
    rb_define_method(cField, "fore=", field_set_fore, 1);
    rb_define_method(cField, "fore", field_get_fore, 0);
    rb_define_method(cField, "set_back", field_set_back, 1);
    rb_define_method(cField, "back=", field_set_back, 1);
    rb_define_method(cField, "back", field_get_back, 0);
    rb_define_method(cField, "opts_on", field_opts_on_m, 1);
    rb_define_method(cField, "opts_off", field_opts_off_m, 1);
    rb_define_method(cField, "opts", field_opts_m, 0);
    rb_define_method(cField, "height", field_height, 0);
    rb_define_method(cField, "width", field_width, 0);
    rb_define_method(cField, "toprow", field_toprow, 0);
    rb_define_method(cField, "leftcol", field_leftcol, 0);
    rb_define_method(cField, "offscreen", field_offscreen, 0);
    rb_define_method(cField, "nbuffers", field_nbuffers, 0);
    rb_define_method(cField, "dynamic_height", field_dynamic_height, 0);
    rb_define_method(cField, "dynamic_width", field_dynamic_width, 0);
    rb_define_method(cField, "max", field_max, 0);
    rb_define_method(cField, "set_max", field_set_max, 1);
    rb_define_method(cField, "max=", field_set_max, 1);
    rb_define_method(cField, "set_type", field_set_type, -1);

    cForm = rb_define_class_under(mCurses, "Form", rb_cObject);
    rb_define_alloc_func(cForm, form_s_allocate);
    rb_define_method(cForm, "initialize", form_initialize, 1);
    rb_define_method(cForm, "post", form_post, 0);
    rb_define_method(cForm, "unpost", form_unpost, 0);
    rb_define_method(cForm, "driver", form_driver_m, 1);
    rb_define_method(cForm, "set_win", form_set_win, 1);
    rb_define_method(cForm, "set_sub", form_set_sub, 1);
    rb_define_method(cForm, "scale", form_scale, 0);
#endif

#define rb_curses_define_error(c) do { \
	e##c = rb_define_class_under(mCurses, #c, eError); \
} while (0)    

    eError = rb_define_class_under(mCurses, "Error", rb_eStandardError);
    rb_curses_define_error(SystemError);
    rb_curses_define_error(BadArgumentError);
    rb_curses_define_error(PostedError);
    rb_curses_define_error(ConnectedError);
    rb_curses_define_error(BadStateError);
    rb_curses_define_error(NoRoomError);
    rb_curses_define_error(NotPostedError);
    rb_curses_define_error(UnknownCommandError);
    rb_curses_define_error(NoMatchError);
    rb_curses_define_error(NotSelectableError);
    rb_curses_define_error(NotConnectedError);
    rb_curses_define_error(RequestDeniedError);
    rb_curses_define_error(InvalidFieldError);
    rb_curses_define_error(CurrentError);

#define rb_curses_define_const(c) rb_define_const(mCurses,#c,CHTYPE2NUM(c))

#ifdef USE_COLOR
    /* Document-const: A_ATTRIBUTES
     *
     * Character attribute mask:
     * Bit-mask to extract attributes
     *
     * See Curses.inch or Curses::Window.inch
     */
    rb_curses_define_const(A_ATTRIBUTES);
#ifdef A_NORMAL
    /* Document-const: A_NORMAL
     *
     * Attribute mask:
     * Normal display (no highlight)
     *
     * See Curses.attrset
     */
    rb_curses_define_const(A_NORMAL);
#endif
    /* Document-const: A_STANDOUT
     *
     * Attribute mask:
     * Best highlighting mode of the terminal.
     *
     * See Curses.attrset
     */
    rb_curses_define_const(A_STANDOUT);
    /* Document-const: A_UNDERLINE
     *
     * Attribute mask:
     * Underlining
     *
     * See Curses.attrset
     */
    rb_curses_define_const(A_UNDERLINE);
    /* Document-const: A_REVERSE
     *
     * Attribute mask:
     * Reverse video
     *
     * See Curses.attrset
     */
    rb_curses_define_const(A_REVERSE);
    /* Document-const: A_BLINK
     *
     * Attribute mask:
     * Blinking
     *
     * See Curses.attrset
     */
    rb_curses_define_const(A_BLINK);
    /* Document-const: A_DIM
     *
     * Attribute mask:
     * Half bright
     *
     * See Curses.attrset
     */
    rb_curses_define_const(A_DIM);
    /* Document-const: A_BOLD
     *
     * Attribute mask:
     * Extra bright or bold
     *
     * See Curses.attrset
     */
    rb_curses_define_const(A_BOLD);
    /* Document-const: A_PROTECT
     *
     * Attribute mask:
     * Protected mode
     *
     * See Curses.attrset
     */
    rb_curses_define_const(A_PROTECT);
#ifdef A_INVIS /* for NetBSD */
    /* Document-const: A_INVIS
     *
     * Attribute mask:
     * Invisible or blank mode
     *
     * See Curses.attrset
     */
    rb_curses_define_const(A_INVIS);
#endif
    /* Document-const: A_ALTCHARSET
     *
     * Attribute mask:
     * Alternate character set
     *
     * See Curses.attrset
     */
    rb_curses_define_const(A_ALTCHARSET);
    /* Document-const: A_CHARTEXT
     *
     * Attribute mask:
     * Bit-mask to extract a character
     *
     * See Curses.attrset
     */
    rb_curses_define_const(A_CHARTEXT);
#ifdef A_HORIZONTAL
    /* Document-const: A_HORIZONTAL
     *
     * Attribute mask:
     * horizontal highlight
     *
     * Check system curs_attr(3x) for support
     */
    rb_curses_define_const(A_HORIZONTAL);
#endif
#ifdef A_LEFT
    /* Document-const: A_LEFT
     *
     * Attribute mask:
     * left highlight
     *
     * Check system curs_attr(3x) for support
     */
    rb_curses_define_const(A_LEFT);
#endif
#ifdef A_LOW
    /* Document-const: A_LOW
     *
     * Attribute mask:
     * low highlight
     *
     * Check system curs_attr(3x) for support
     */
    rb_curses_define_const(A_LOW);
#endif
#ifdef A_RIGHT
    /* Document-const: A_RIGHT
     *
     * Attribute mask:
     * right highlight
     *
     * Check system curs_attr(3x) for support
     */
    rb_curses_define_const(A_RIGHT);
#endif
#ifdef A_TOP
    /* Document-const: A_TOP
     *
     * Attribute mask:
     * top highlight
     *
     * Check system curs_attr(3x) for support
     */
    rb_curses_define_const(A_TOP);
#endif
#ifdef A_VERTICAL
    /* Document-const: A_VERTICAL
     *
     * Attribute mask:
     * vertical highlight
     *
     * Check system curs_attr(3x) for support
     */
    rb_curses_define_const(A_VERTICAL);
#endif
    /* Document-const: A_COLOR
     *
     * Character attribute mask:
     * Bit-mask to extract color-pair field information
     *
     * See Curses.inch or Curses::Window.inch
     */
    rb_curses_define_const(A_COLOR);

#ifdef COLORS
    /*
     * Document-const: Curses::COLORS
     *
     * Number of the colors available
     */
    rb_curses_define_const(COLORS);
#endif
    /*
     * Document-const: Curses::COLOR_BLACK
     *
     * Value of the color black
     */
    rb_curses_define_const(COLOR_BLACK);
    /*
     * Document-const: COLOR_RED
     *
     * Value of the color red
     */
    rb_curses_define_const(COLOR_RED);
    /*
     * Document-const: COLOR_GREEN
     *
     * Value of the color green
     */
    rb_curses_define_const(COLOR_GREEN);
    /*
     * Document-const: COLOR_YELLOW
     *
     * Value of the color yellow
     */
    rb_curses_define_const(COLOR_YELLOW);
    /*
     * Document-const: COLOR_BLUE
     *
     * Value of the color blue
     */
    rb_curses_define_const(COLOR_BLUE);
    /*
     * Document-const: COLOR_MAGENTA
     *
     * Value of the color magenta
     */
    rb_curses_define_const(COLOR_MAGENTA);
    /*
     * Document-const: COLOR_CYAN
     *
     * Value of the color cyan
     */
    rb_curses_define_const(COLOR_CYAN);
    /*
     * Document-const: COLOR_WHITE
     *
     * Value of the color white
     */
    rb_curses_define_const(COLOR_WHITE);
#endif /* USE_COLOR */
#ifdef USE_MOUSE
#ifdef BUTTON1_PRESSED
    /* Document-const: BUTTON1_PRESSED
     *
     * Mouse event mask:
     * mouse button 1 down
     *
     * See Curses.getmouse
     */
    rb_curses_define_const(BUTTON1_PRESSED);
#endif
#ifdef BUTTON1_RELEASED
    /* Document-const: BUTTON1_RELEASED
     *
     * Mouse event mask:
     * mouse button 1 up
     *
     * See Curses.getmouse
     */
    rb_curses_define_const(BUTTON1_RELEASED);
#endif
#ifdef BUTTON1_CLICKED
    /* Document-const: BUTTON1_CLICKED
     *
     * Mouse event mask:
     * mouse button 1 clicked
     *
     * See Curses.getmouse
     */
    rb_curses_define_const(BUTTON1_CLICKED);
#endif
#ifdef BUTTON1_DOUBLE_CLICKED
    /* Document-const: BUTTON1_DOUBLE_CLICKED
     *
     * Mouse event mask:
     * mouse button 1 double clicked
     *
     * See Curses.getmouse
     */
    rb_curses_define_const(BUTTON1_DOUBLE_CLICKED);
#endif
#ifdef BUTTON1_TRIPLE_CLICKED
    /* Document-const: BUTTON1_TRIPLE_CLICKED
     *
     * Mouse event mask:
     * mouse button 1 triple clicked
     *
     * See Curses.getmouse
     */
    rb_curses_define_const(BUTTON1_TRIPLE_CLICKED);
#endif
#ifdef BUTTON2_PRESSED
    /* Document-const: BUTTON2_PRESSED
     *
     * Mouse event mask:
     * mouse button 2 down
     *
     * See Curses.getmouse
     */
    rb_curses_define_const(BUTTON2_PRESSED);
#endif
#ifdef BUTTON2_RELEASED
    /* Document-const: BUTTON2_RELEASED
     *
     * Mouse event mask:
     * mouse button 2 up
     *
     * See Curses.getmouse
     */
    rb_curses_define_const(BUTTON2_RELEASED);
#endif
#ifdef BUTTON2_CLICKED
    /* Document-const: BUTTON2_CLICKED
     *
     * Mouse event mask:
     * mouse button 2 clicked
     *
     * See Curses.getmouse
     */
    rb_curses_define_const(BUTTON2_CLICKED);
#endif
#ifdef BUTTON2_DOUBLE_CLICKED
    /* Document-const: BUTTON2_DOUBLE_CLICKED
     *
     * Mouse event mask:
     * mouse button 2 double clicked
     *
     * See Curses.getmouse
     */
    rb_curses_define_const(BUTTON2_DOUBLE_CLICKED);
#endif
#ifdef BUTTON2_TRIPLE_CLICKED
    /* Document-const: BUTTON2_TRIPLE_CLICKED
     *
     * Mouse event mask:
     * mouse button 2 triple clicked
     *
     * See Curses.getmouse
     */
    rb_curses_define_const(BUTTON2_TRIPLE_CLICKED);
#endif
#ifdef BUTTON3_PRESSED
    /* Document-const: BUTTON3_PRESSED
     *
     * Mouse event mask:
     * mouse button 3 down
     *
     * See Curses.getmouse
     */
    rb_curses_define_const(BUTTON3_PRESSED);
#endif
#ifdef BUTTON3_RELEASED
    /* Document-const: BUTTON3_RELEASED
     *
     * Mouse event mask:
     * mouse button 3 up
     *
     * See Curses.getmouse
     */
    rb_curses_define_const(BUTTON3_RELEASED);
#endif
#ifdef BUTTON3_CLICKED
    /* Document-const: BUTTON3_CLICKED
     *
     * Mouse event mask:
     * mouse button 3 clicked
     *
     * See Curses.getmouse
     */
    rb_curses_define_const(BUTTON3_CLICKED);
#endif
#ifdef BUTTON3_DOUBLE_CLICKED
    /* Document-const: BUTTON3_DOUBLE_CLICKED
     *
     * Mouse event mask:
     * mouse button 3 double clicked
     *
     * See Curses.getmouse
     */
    rb_curses_define_const(BUTTON3_DOUBLE_CLICKED);
#endif
#ifdef BUTTON3_TRIPLE_CLICKED
    /* Document-const: BUTTON3_TRIPLE_CLICKED
     *
     * Mouse event mask:
     * mouse button 3 triple clicked
     *
     * See Curses.getmouse
     */
    rb_curses_define_const(BUTTON3_TRIPLE_CLICKED);
#endif
#ifdef BUTTON4_PRESSED
    /* Document-const: BUTTON4_PRESSED
     *
     * Mouse event mask:
     * mouse button 4 down
     *
     * See Curses.getmouse
     */
    rb_curses_define_const(BUTTON4_PRESSED);
#endif
#ifdef BUTTON4_RELEASED
    /* Document-const: BUTTON4_RELEASED
     *
     * Mouse event mask:
     * mouse button 4 up
     *
     * See Curses.getmouse
     */
    rb_curses_define_const(BUTTON4_RELEASED);
#endif
#ifdef BUTTON4_CLICKED
    /* Document-const: BUTTON4_CLICKED
     *
     * Mouse event mask:
     * mouse button 4 clicked
     *
     * See Curses.getmouse
     */
    rb_curses_define_const(BUTTON4_CLICKED);
#endif
#ifdef BUTTON4_DOUBLE_CLICKED
    /* Document-const: BUTTON4_DOUBLE_CLICKED
     *
     * Mouse event mask:
     * mouse button 4 double clicked
     *
     * See Curses.getmouse
     */
    rb_curses_define_const(BUTTON4_DOUBLE_CLICKED);
#endif
#ifdef BUTTON4_TRIPLE_CLICKED
    /* Document-const: BUTTON4_TRIPLE_CLICKED
     *
     * Mouse event mask:
     * mouse button 4 triple clicked
     *
     * See Curses.getmouse
     */
    rb_curses_define_const(BUTTON4_TRIPLE_CLICKED);
#endif
#ifdef BUTTON_SHIFT
    /* Document-const: BUTTON_SHIFT
     *
     * Mouse event mask:
     * shift was down during button state change
     *
     * See Curses.getmouse
     */
    rb_curses_define_const(BUTTON_SHIFT);
#endif
#ifdef BUTTON_CTRL
    /* Document-const: BUTTON_CTRL
     *
     * Mouse event mask:
     * control was down during button state change
     *
     * See Curses.getmouse
     */
    rb_curses_define_const(BUTTON_CTRL);
#endif
#ifdef BUTTON_ALT
    /* Document-const: BUTTON_ALT
     *
     * Mouse event mask:
     * alt was down during button state change
     *
     * See Curses.getmouse
     */
    rb_curses_define_const(BUTTON_ALT);
#endif
#ifdef ALL_MOUSE_EVENTS
    /* Document-const: ALL_MOUSE_EVENTS
     *
     * Mouse event mask:
     * report all button state changes
     *
     * See Curses.getmouse
     */
    rb_curses_define_const(ALL_MOUSE_EVENTS);
#endif
#ifdef REPORT_MOUSE_POSITION
    /* Document-const: REPORT_MOUSE_POSITION
     *
     * Mouse event mask:
     * report mouse movement
     *
     * See Curses.getmouse
     */
    rb_curses_define_const(REPORT_MOUSE_POSITION);
#endif
#endif /* USE_MOUSE */

#if defined(KEY_MOUSE) && defined(USE_MOUSE)
    /* Document-const: KEY_MOUSE
     * Mouse event read
     */
    /* Document-const: MOUSE
     * Mouse event read
     */
    rb_curses_define_const(KEY_MOUSE);
    rb_define_const(mKey, "MOUSE", INT2NUM(KEY_MOUSE));
#endif
#ifdef KEY_MIN
    /* Document-const: KEY_MIN
     * The minimum allowed curses key value.
     */
    /* Document-const: MIN
     * The minimum allowed curses key value.
     */
    rb_curses_define_const(KEY_MIN);
    rb_define_const(mKey, "MIN", INT2NUM(KEY_MIN));
#endif
#ifdef KEY_BREAK
    /* Document-const: KEY_BREAK
     * Break key
     */
    /* Document-const: BREAK
     * Break key
     */
    rb_curses_define_const(KEY_BREAK);
    rb_define_const(mKey, "BREAK", INT2NUM(KEY_BREAK));
#endif
#ifdef KEY_DOWN
    /* Document-const: KEY_DOWN
     * the down arrow key
     */
    /* Document-const: DOWN
     * the down arrow key
     */
    rb_curses_define_const(KEY_DOWN);
    rb_define_const(mKey, "DOWN", INT2NUM(KEY_DOWN));
#endif
#ifdef KEY_UP
    /* Document-const: KEY_UP
     * the up arrow key
     */
    /* Document-const: UP
     * the up arrow key
     */
    rb_curses_define_const(KEY_UP);
    rb_define_const(mKey, "UP", INT2NUM(KEY_UP));
#endif
#ifdef KEY_LEFT
    /* Document-const: KEY_LEFT
     * the left arrow key
     */
    /* Document-const: LEFT
     * the left arrow key
     */
    rb_curses_define_const(KEY_LEFT);
    rb_define_const(mKey, "LEFT", INT2NUM(KEY_LEFT));
#endif
#ifdef KEY_RIGHT
    /* Document-const: KEY_RIGHT
     * the right arrow key
     */
    /* Document-const: RIGHT
     * the right arrow key
     */
    rb_curses_define_const(KEY_RIGHT);
    rb_define_const(mKey, "RIGHT", INT2NUM(KEY_RIGHT));
#endif
#ifdef KEY_HOME
    /* Document-const: KEY_HOME
     * Home key (upward+left arrow)
     */
    /* Document-const: HOME
     * Home key (upward+left arrow)
     */
    rb_curses_define_const(KEY_HOME);
    rb_define_const(mKey, "HOME", INT2NUM(KEY_HOME));
#endif
#ifdef KEY_BACKSPACE
    /* Document-const: KEY_BACKSPACE
     * Backspace
     */
    /* Document-const: BACKSPACE
     * Backspace
     */
    rb_curses_define_const(KEY_BACKSPACE);
    rb_define_const(mKey, "BACKSPACE", INT2NUM(KEY_BACKSPACE));
#endif
#ifdef KEY_F
    /* KEY_F(n) : 0 <= n <= 63 */
    {
	int i;
	char c[8];
	for (i=0; i<64; i++) {
	    sprintf(c, "KEY_F%d", i);
	    rb_define_const(mCurses, c, INT2NUM(KEY_F(i)));
	    sprintf(c, "F%d", i);
	    rb_define_const(mKey, c, INT2NUM(KEY_F(i)));
	}
    }
#endif
#ifdef KEY_DL
    /* Document-const: KEY_DL
     * Delete line
     */
    /* Document-const: DL
     * Delete line
     */
    rb_curses_define_const(KEY_DL);
    rb_define_const(mKey, "DL", INT2NUM(KEY_DL));
#endif
#ifdef KEY_IL
    /* Document-const: KEY_IL
     * Insert line
     */
    /* Document-const: IL
     * Insert line
     */
    rb_curses_define_const(KEY_IL);
    rb_define_const(mKey, "IL", INT2NUM(KEY_IL));
#endif
#ifdef KEY_DC
    /* Document-const: KEY_DC
     * Delete character
     */
    /* Document-const: DC
     * Delete character
     */
    rb_curses_define_const(KEY_DC);
    rb_define_const(mKey, "DC", INT2NUM(KEY_DC));
#endif
#ifdef KEY_IC
    /* Document-const: KEY_IC
     * Insert char or enter insert mode
     */
    /* Document-const: IC
     * Insert char or enter insert mode
     */
    rb_curses_define_const(KEY_IC);
    rb_define_const(mKey, "IC", INT2NUM(KEY_IC));
#endif
#ifdef KEY_EIC
    /* Document-const: KEY_EIC
     * Enter insert char mode
     */
    /* Document-const: EIC
     * Enter insert char mode
     */
    rb_curses_define_const(KEY_EIC);
    rb_define_const(mKey, "EIC", INT2NUM(KEY_EIC));
#endif
#ifdef KEY_CLEAR
    /* Document-const: KEY_CLEAR
     * Clear Screen
     */
    /* Document-const: CLEAR
     * Clear Screen
     */
    rb_curses_define_const(KEY_CLEAR);
    rb_define_const(mKey, "CLEAR", INT2NUM(KEY_CLEAR));
#endif
#ifdef KEY_EOS
    /* Document-const: KEY_EOS
     * Clear to end of screen
     */
    /* Document-const: EOS
     * Clear to end of screen
     */
    rb_curses_define_const(KEY_EOS);
    rb_define_const(mKey, "EOS", INT2NUM(KEY_EOS));
#endif
#ifdef KEY_EOL
    /* Document-const: KEY_EOL
     * Clear to end of line
     */
    /* Document-const: EOL
     * Clear to end of line
     */
    rb_curses_define_const(KEY_EOL);
    rb_define_const(mKey, "EOL", INT2NUM(KEY_EOL));
#endif
#ifdef KEY_SF
    /* Document-const: KEY_SF
     * Scroll 1 line forward
     */
    /* Document-const: SF
     * Scroll 1 line forward
     */
    rb_curses_define_const(KEY_SF);
    rb_define_const(mKey, "SF", INT2NUM(KEY_SF));
#endif
#ifdef KEY_SR
    /* Document-const: KEY_SR
     * Scroll 1 line backward (reverse)
     */
    /* Document-const: SR
     * Scroll 1 line backward (reverse)
     */
    rb_curses_define_const(KEY_SR);
    rb_define_const(mKey, "SR", INT2NUM(KEY_SR));
#endif
#ifdef KEY_NPAGE
    /* Document-const: KEY_NPAGE
     * Next page
     */
    /* Document-const: NPAGE
     * Next page
     */
    rb_curses_define_const(KEY_NPAGE);
    rb_define_const(mKey, "NPAGE", INT2NUM(KEY_NPAGE));
#endif
#ifdef KEY_PPAGE
    /* Document-const: KEY_PPAGE
     * Previous page
     */
    /* Document-const: PPAGE
     * Previous page
     */
    rb_curses_define_const(KEY_PPAGE);
    rb_define_const(mKey, "PPAGE", INT2NUM(KEY_PPAGE));
#endif
#ifdef KEY_STAB
    /* Document-const: KEY_STAB
     * Set tab
     */
    /* Document-const: STAB
     * Set tab
     */
    rb_curses_define_const(KEY_STAB);
    rb_define_const(mKey, "STAB", INT2NUM(KEY_STAB));
#endif
#ifdef KEY_CTAB
    /* Document-const: KEY_CTAB
     * Clear tab
     */
    /* Document-const: CTAB
     * Clear tab
     */
    rb_curses_define_const(KEY_CTAB);
    rb_define_const(mKey, "CTAB", INT2NUM(KEY_CTAB));
#endif
#ifdef KEY_CATAB
    /* Document-const: KEY_CATAB
     * Clear all tabs
     */
    /* Document-const: CATAB
     * Clear all tabs
     */
    rb_curses_define_const(KEY_CATAB);
    rb_define_const(mKey, "CATAB", INT2NUM(KEY_CATAB));
#endif
#ifdef KEY_ENTER
    /* Document-const: KEY_ENTER
     * Enter or send
     */
    /* Document-const: ENTER
     * Enter or send
     */
    rb_curses_define_const(KEY_ENTER);
    rb_define_const(mKey, "ENTER", INT2NUM(KEY_ENTER));
#endif
#ifdef KEY_SRESET
    /* Document-const: KEY_SRESET
     * Soft (partial) reset
     */
    /* Document-const: SRESET
     * Soft (partial) reset
     */
    rb_curses_define_const(KEY_SRESET);
    rb_define_const(mKey, "SRESET", INT2NUM(KEY_SRESET));
#endif
#ifdef KEY_RESET
    /* Document-const: KEY_RESET
     * Reset or hard reset
     */
    /* Document-const: RESET
     * Reset or hard reset
     */
    rb_curses_define_const(KEY_RESET);
    rb_define_const(mKey, "RESET", INT2NUM(KEY_RESET));
#endif
#ifdef KEY_PRINT
    /* Document-const: KEY_PRINT
     * Print or copy
     */
    /* Document-const: PRINT
     * Print or copy
     */
    rb_curses_define_const(KEY_PRINT);
    rb_define_const(mKey, "PRINT", INT2NUM(KEY_PRINT));
#endif
#ifdef KEY_LL
    /* Document-const: KEY_LL
     * Home down or bottom (lower left)
     */
    /* Document-const: LL
     * Home down or bottom (lower left)
     */
    rb_curses_define_const(KEY_LL);
    rb_define_const(mKey, "LL", INT2NUM(KEY_LL));
#endif
#ifdef KEY_A1
    /* Document-const: KEY_A1
     * Upper left of keypad
     */
    /* Document-const: A1
     * Upper left of keypad
     */
    rb_curses_define_const(KEY_A1);
    rb_define_const(mKey, "A1", INT2NUM(KEY_A1));
#endif
#ifdef KEY_A3
    /* Document-const: KEY_A3
     * Upper right of keypad
     */
    /* Document-const: A3
     * Upper right of keypad
     */
    rb_curses_define_const(KEY_A3);
    rb_define_const(mKey, "A3", INT2NUM(KEY_A3));
#endif
#ifdef KEY_B2
    /* Document-const: KEY_B2
     * Center of keypad
     */
    /* Document-const: B2
     * Center of keypad
     */
    rb_curses_define_const(KEY_B2);
    rb_define_const(mKey, "B2", INT2NUM(KEY_B2));
#endif
#ifdef KEY_C1
    /* Document-const: KEY_C1
     * Lower left of keypad
     */
    /* Document-const: C1
     * Lower left of keypad
     */
    rb_curses_define_const(KEY_C1);
    rb_define_const(mKey, "C1", INT2NUM(KEY_C1));
#endif
#ifdef KEY_C3
    /* Document-const: KEY_C3
     * Lower right of keypad
     */
    /* Document-const: C3
     * Lower right of keypad
     */
    rb_curses_define_const(KEY_C3);
    rb_define_const(mKey, "C3", INT2NUM(KEY_C3));
#endif
#ifdef KEY_BTAB
    /* Document-const: BTAB
     * Back tab key
     */
    /* Document-const: KEY_BTAB
     * Back tab key
     */
    rb_curses_define_const(KEY_BTAB);
    rb_define_const(mKey, "BTAB", INT2NUM(KEY_BTAB));
#endif
#ifdef KEY_BEG
    /* Document-const: KEY_BEG
     * Beginning key
     */
    /* Document-const: BEG
     * Beginning key
     */
    rb_curses_define_const(KEY_BEG);
    rb_define_const(mKey, "BEG", INT2NUM(KEY_BEG));
#endif
#ifdef KEY_CANCEL
    /* Document-const: KEY_CANCEL
     * Cancel key
     */
    /* Document-const: CANCEL
     * Cancel key
     */
    rb_curses_define_const(KEY_CANCEL);
    rb_define_const(mKey, "CANCEL", INT2NUM(KEY_CANCEL));
#endif
#ifdef KEY_CLOSE
    /* Document-const: KEY_CLOSE
     * Close key
     */
    /* Document-const: CLOSE
     * Close key
     */
    rb_curses_define_const(KEY_CLOSE);
    rb_define_const(mKey, "CLOSE", INT2NUM(KEY_CLOSE));
#endif
#ifdef KEY_COMMAND
    /* Document-const: KEY_COMMAND
     * Cmd (command) key
     */
    /* Document-const: COMMAND
     * Cmd (command) key
     */
    rb_curses_define_const(KEY_COMMAND);
    rb_define_const(mKey, "COMMAND", INT2NUM(KEY_COMMAND));
#endif
#ifdef KEY_COPY
    /* Document-const: KEY_COPY
     * Copy key
     */
    /* Document-const: COPY
     * Copy key
     */
    rb_curses_define_const(KEY_COPY);
    rb_define_const(mKey, "COPY", INT2NUM(KEY_COPY));
#endif
#ifdef KEY_CREATE
    /* Document-const: KEY_CREATE
     * Create key
     */
    /* Document-const: CREATE
     * Create key
     */
    rb_curses_define_const(KEY_CREATE);
    rb_define_const(mKey, "CREATE", INT2NUM(KEY_CREATE));
#endif
#ifdef KEY_END
    /* Document-const: KEY_END
     * End key
     */
    /* Document-const: END
     * End key
     */
    rb_curses_define_const(KEY_END);
    rb_define_const(mKey, "END", INT2NUM(KEY_END));
#endif
#ifdef KEY_EXIT
    /* Document-const: KEY_EXIT
     * Exit key
     */
    /* Document-const: EXIT
     * Exit key
     */
    rb_curses_define_const(KEY_EXIT);
    rb_define_const(mKey, "EXIT", INT2NUM(KEY_EXIT));
#endif
#ifdef KEY_FIND
    /* Document-const: KEY_FIND
     * Find key
     */
    /* Document-const: FIND
     * Find key
     */
    rb_curses_define_const(KEY_FIND);
    rb_define_const(mKey, "FIND", INT2NUM(KEY_FIND));
#endif
#ifdef KEY_HELP
    /* Document-const: KEY_HELP
     * Help key
     */
    /* Document-const: HELP
     * Help key
     */
    rb_curses_define_const(KEY_HELP);
    rb_define_const(mKey, "HELP", INT2NUM(KEY_HELP));
#endif
#ifdef KEY_MARK
    /* Document-const: KEY_MARK
     * Mark key
     */
    /* Document-const: MARK
     * Mark key
     */
    rb_curses_define_const(KEY_MARK);
    rb_define_const(mKey, "MARK", INT2NUM(KEY_MARK));
#endif
#ifdef KEY_MESSAGE
    /* Document-const: KEY_MESSAGE
     * Message key
     */
    /* Document-const: MESSAGE
     * Message key
     */
    rb_curses_define_const(KEY_MESSAGE);
    rb_define_const(mKey, "MESSAGE", INT2NUM(KEY_MESSAGE));
#endif
#ifdef KEY_MOVE
    /* Document-const: KEY_MOVE
     * Move key
     */
    /* Document-const: MOVE
     * Move key
     */
    rb_curses_define_const(KEY_MOVE);
    rb_define_const(mKey, "MOVE", INT2NUM(KEY_MOVE));
#endif
#ifdef KEY_NEXT
    /* Document-const: KEY_NEXT
     * Next object key
     */
    /* Document-const: NEXT
     * Next object key
     */
    rb_curses_define_const(KEY_NEXT);
    rb_define_const(mKey, "NEXT", INT2NUM(KEY_NEXT));
#endif
#ifdef KEY_OPEN
    /* Document-const: KEY_OPEN
     * Open key
     */
    /* Document-const: OPEN
     * Open key
     */
    rb_curses_define_const(KEY_OPEN);
    rb_define_const(mKey, "OPEN", INT2NUM(KEY_OPEN));
#endif
#ifdef KEY_OPTIONS
    /* Document-const: KEY_OPTIONS
     * Options key
     */
    /* Document-const: OPTIONS
     * Options key
     */
    rb_curses_define_const(KEY_OPTIONS);
    rb_define_const(mKey, "OPTIONS", INT2NUM(KEY_OPTIONS));
#endif
#ifdef KEY_PREVIOUS
    /* Document-const: KEY_PREVIOUS
     * Previous object key
     */
    /* Document-const: PREVIOUS
     * Previous object key
     */
    rb_curses_define_const(KEY_PREVIOUS);
    rb_define_const(mKey, "PREVIOUS", INT2NUM(KEY_PREVIOUS));
#endif
#ifdef KEY_REDO
    /* Document-const: KEY_REDO
     * Redo key
     */
    /* Document-const: REDO
     * Redo key
     */
    rb_curses_define_const(KEY_REDO);
    rb_define_const(mKey, "REDO", INT2NUM(KEY_REDO));
#endif
#ifdef KEY_REFERENCE
    /* Document-const: KEY_REFERENCE
     * Reference key
     */
    /* Document-const: REFERENCE
     * Reference key
     */
    rb_curses_define_const(KEY_REFERENCE);
    rb_define_const(mKey, "REFERENCE", INT2NUM(KEY_REFERENCE));
#endif
#ifdef KEY_REFRESH
    /* Document-const: KEY_REFRESH
     * Refresh key
     */
    /* Document-const: REFRESH
     * Refresh key
     */
    rb_curses_define_const(KEY_REFRESH);
    rb_define_const(mKey, "REFRESH", INT2NUM(KEY_REFRESH));
#endif
#ifdef KEY_REPLACE
    /* Document-const: KEY_REPLACE
     * Replace key
     */
    /* Document-const: REPLACE
     * Replace key
     */
    rb_curses_define_const(KEY_REPLACE);
    rb_define_const(mKey, "REPLACE", INT2NUM(KEY_REPLACE));
#endif
#ifdef KEY_RESTART
    /* Document-const: KEY_RESTART
     * Restart key
     */
    /* Document-const: RESTART
     * Restart key
     */
    rb_curses_define_const(KEY_RESTART);
    rb_define_const(mKey, "RESTART", INT2NUM(KEY_RESTART));
#endif
#ifdef KEY_RESUME
    /* Document-const: KEY_RESUME
     * Resume key
     */
    /* Document-const: RESUME
     * Resume key
     */
    rb_curses_define_const(KEY_RESUME);
    rb_define_const(mKey, "RESUME", INT2NUM(KEY_RESUME));
#endif
#ifdef KEY_SAVE
    /* Document-const: KEY_SAVE
     * Save key
     */
    /* Document-const: SAVE
     * Save key
     */
    rb_curses_define_const(KEY_SAVE);
    rb_define_const(mKey, "SAVE", INT2NUM(KEY_SAVE));
#endif
#ifdef KEY_SBEG
    /* Document-const: KEY_SBEG
     * Shifted beginning key
     */
    /* Document-const: SBEG
     * Shifted beginning key
     */
    rb_curses_define_const(KEY_SBEG);
    rb_define_const(mKey, "SBEG", INT2NUM(KEY_SBEG));
#endif
#ifdef KEY_SCANCEL
    /* Document-const: KEY_SCANCEL
     * Shifted cancel key
     */
    /* Document-const: SCANCEL
     * Shifted cancel key
     */
    rb_curses_define_const(KEY_SCANCEL);
    rb_define_const(mKey, "SCANCEL", INT2NUM(KEY_SCANCEL));
#endif
#ifdef KEY_SCOMMAND
    /* Document-const: KEY_SCOMMAND
     * Shifted command key
     */
    /* Document-const: SCOMMAND
     * Shifted command key
     */
    rb_curses_define_const(KEY_SCOMMAND);
    rb_define_const(mKey, "SCOMMAND", INT2NUM(KEY_SCOMMAND));
#endif
#ifdef KEY_SCOPY
    /* Document-const: KEY_SCOPY
     * Shifted copy key
     */
    /* Document-const: SCOPY
     * Shifted copy key
     */
    rb_curses_define_const(KEY_SCOPY);
    rb_define_const(mKey, "SCOPY", INT2NUM(KEY_SCOPY));
#endif
#ifdef KEY_SCREATE
    /* Document-const: KEY_SCREATE
     * Shifted create key
     */
    /* Document-const: SCREATE
     * Shifted create key
     */
    rb_curses_define_const(KEY_SCREATE);
    rb_define_const(mKey, "SCREATE", INT2NUM(KEY_SCREATE));
#endif
#ifdef KEY_SDC
    /* Document-const: KEY_SDC
     * Shifted delete char key
     */
    /* Document-const: SDC
     * Shifted delete char key
     */
    rb_curses_define_const(KEY_SDC);
    rb_define_const(mKey, "SDC", INT2NUM(KEY_SDC));
#endif
#ifdef KEY_SDL
    /* Document-const: KEY_SDL
     * Shifted delete line key
     */
    /* Document-const: SDL
     * Shifted delete line key
     */
    rb_curses_define_const(KEY_SDL);
    rb_define_const(mKey, "SDL", INT2NUM(KEY_SDL));
#endif
#ifdef KEY_SELECT
    /* Document-const: KEY_SELECT
     * Select key
     */
    /* Document-const: SELECT
     * Select key
     */
    rb_curses_define_const(KEY_SELECT);
    rb_define_const(mKey, "SELECT", INT2NUM(KEY_SELECT));
#endif
#ifdef KEY_SEND
    /* Document-const: KEY_SEND
     * Shifted end key
     */
    /* Document-const: SEND
     * Shifted end key
     */
    rb_curses_define_const(KEY_SEND);
    rb_define_const(mKey, "SEND", INT2NUM(KEY_SEND));
#endif
#ifdef KEY_SEOL
    /* Document-const: KEY_SEOL
     * Shifted clear line key
     */
    /* Document-const: SEOL
     * Shifted clear line key
     */
    rb_curses_define_const(KEY_SEOL);
    rb_define_const(mKey, "SEOL", INT2NUM(KEY_SEOL));
#endif
#ifdef KEY_SEXIT
    /* Document-const: KEY_SEXIT
     * Shifted exit key
     */
    /* Document-const: SEXIT
     * Shifted exit key
     */
    rb_curses_define_const(KEY_SEXIT);
    rb_define_const(mKey, "SEXIT", INT2NUM(KEY_SEXIT));
#endif
#ifdef KEY_SFIND
    /* Document-const: KEY_SFIND
     * Shifted find key
     */
    /* Document-const: SFIND
     * Shifted find key
     */
    rb_curses_define_const(KEY_SFIND);
    rb_define_const(mKey, "SFIND", INT2NUM(KEY_SFIND));
#endif
#ifdef KEY_SHELP
    /* Document-const: KEY_SHELP
     * Shifted help key
     */
    /* Document-const: SHELP
     * Shifted help key
     */
    rb_curses_define_const(KEY_SHELP);
    rb_define_const(mKey, "SHELP", INT2NUM(KEY_SHELP));
#endif
#ifdef KEY_SHOME
    /* Document-const: KEY_SHOME
     * Shifted home key
     */
    /* Document-const: SHOME
     * Shifted home key
     */
    rb_curses_define_const(KEY_SHOME);
    rb_define_const(mKey, "SHOME", INT2NUM(KEY_SHOME));
#endif
#ifdef KEY_SIC
    /* Document-const: KEY_SIC
     * Shifted input key
     */
    /* Document-const: SIC
     * Shifted input key
     */
    rb_curses_define_const(KEY_SIC);
    rb_define_const(mKey, "SIC", INT2NUM(KEY_SIC));
#endif
#ifdef KEY_SLEFT
    /* Document-const: KEY_SLEFT
     * Shifted left arrow key
     */
    /* Document-const: SLEFT
     * Shifted left arrow key
     */
    rb_curses_define_const(KEY_SLEFT);
    rb_define_const(mKey, "SLEFT", INT2NUM(KEY_SLEFT));
#endif
#ifdef KEY_SMESSAGE
    /* Document-const: KEY_SMESSAGE
     * Shifted message key
     */
    /* Document-const: SMESSAGE
     * Shifted message key
     */
    rb_curses_define_const(KEY_SMESSAGE);
    rb_define_const(mKey, "SMESSAGE", INT2NUM(KEY_SMESSAGE));
#endif
#ifdef KEY_SMOVE
    /* Document-const: KEY_SMOVE
     * Shifted move key
     */
    /* Document-const: SMOVE
     * Shifted move key
     */
    rb_curses_define_const(KEY_SMOVE);
    rb_define_const(mKey, "SMOVE", INT2NUM(KEY_SMOVE));
#endif
#ifdef KEY_SNEXT
    /* Document-const: KEY_SNEXT
     * Shifted next key
     */
    /* Document-const: SNEXT
     * Shifted next key
     */
    rb_curses_define_const(KEY_SNEXT);
    rb_define_const(mKey, "SNEXT", INT2NUM(KEY_SNEXT));
#endif
#ifdef KEY_SOPTIONS
    /* Document-const: KEY_SOPTIONS
     * Shifted options key
     */
    /* Document-const: SOPTIONS
     * Shifted options key
     */
    rb_curses_define_const(KEY_SOPTIONS);
    rb_define_const(mKey, "SOPTIONS", INT2NUM(KEY_SOPTIONS));
#endif
#ifdef KEY_SPREVIOUS
    /* Document-const: KEY_SPREVIOUS
     * Shifted previous key
     */
    /* Document-const: SPREVIOUS
     * Shifted previous key
     */
    rb_curses_define_const(KEY_SPREVIOUS);
    rb_define_const(mKey, "SPREVIOUS", INT2NUM(KEY_SPREVIOUS));
#endif
#ifdef KEY_SPRINT
    /* Document-const: KEY_SPRINT
     * Shifted print key
     */
    /* Document-const: SPRINT
     * Shifted print key
     */
    rb_curses_define_const(KEY_SPRINT);
    rb_define_const(mKey, "SPRINT", INT2NUM(KEY_SPRINT));
#endif
#ifdef KEY_SREDO
    /* Document-const: KEY_SREDO
     * Shifted redo key
     */
    /* Document-const: SREDO
     * Shifted redo key
     */
    rb_curses_define_const(KEY_SREDO);
    rb_define_const(mKey, "SREDO", INT2NUM(KEY_SREDO));
#endif
#ifdef KEY_SREPLACE
    /* Document-const: KEY_SREPLACE
     * Shifted replace key
     */
    /* Document-const: SREPLACE
     * Shifted replace key
     */
    rb_curses_define_const(KEY_SREPLACE);
    rb_define_const(mKey, "SREPLACE", INT2NUM(KEY_SREPLACE));
#endif
#ifdef KEY_SRIGHT
    /* Document-const: KEY_SRIGHT
     * Shifted right arrow key
     */
    /* Document-const: SRIGHT
     * Shifted right arrow key
     */
    rb_curses_define_const(KEY_SRIGHT);
    rb_define_const(mKey, "SRIGHT", INT2NUM(KEY_SRIGHT));
#endif
#ifdef KEY_SRSUME
    /* Document-const: KEY_SRSUME
     * Shifted resume key
     */
    /* Document-const: SRSUME
     * Shifted resume key
     */
    rb_curses_define_const(KEY_SRSUME);
    rb_define_const(mKey, "SRSUME", INT2NUM(KEY_SRSUME));
#endif
#ifdef KEY_SSAVE
    /* Document-const: KEY_SSAVE
     * Shifted save key
     */
    /* Document-const: SSAVE
     * Shifted save key
     */
    rb_curses_define_const(KEY_SSAVE);
    rb_define_const(mKey, "SSAVE", INT2NUM(KEY_SSAVE));
#endif
#ifdef KEY_SSUSPEND
    /* Document-const: KEY_SSUSPEND
     * Shifted suspend key
     */
    /* Document-const: SSUSPEND
     * Shifted suspend key
     */
    rb_curses_define_const(KEY_SSUSPEND);
    rb_define_const(mKey, "SSUSPEND", INT2NUM(KEY_SSUSPEND));
#endif
#ifdef KEY_SUNDO
    /* Document-const: KEY_SUNDO
     * Shifted undo key
     */
    /* Document-const: SUNDO
     * Shifted undo key
     */
    rb_curses_define_const(KEY_SUNDO);
    rb_define_const(mKey, "SUNDO", INT2NUM(KEY_SUNDO));
#endif
#ifdef KEY_SUSPEND
    /* Document-const: KEY_SUSPEND
     * Suspend key
     */
    /* Document-const: SUSPEND
     * Suspend key
     */
    rb_curses_define_const(KEY_SUSPEND);
    rb_define_const(mKey, "SUSPEND", INT2NUM(KEY_SUSPEND));
#endif
#ifdef KEY_UNDO
    /* Document-const: KEY_UNDO
     * Undo key
     */
    /* Document-const: UNDO
     * Undo key
     */
    rb_curses_define_const(KEY_UNDO);
    rb_define_const(mKey, "UNDO", INT2NUM(KEY_UNDO));
#endif
#ifdef KEY_RESIZE
    /* Document-const: KEY_RESIZE
     * Screen Resized
     */
    /* Document-const: RESIZE
     * Screen Resized
     */
    rb_curses_define_const(KEY_RESIZE);
    rb_define_const(mKey, "RESIZE", INT2NUM(KEY_RESIZE));
#endif
#ifdef KEY_MAX
    /* Document-const: KEY_MAX
     * The maximum allowed curses key value.
     */
    /* Document-const: MAX
     * The maximum allowed curses key value.
     */
    rb_curses_define_const(KEY_MAX);
    rb_define_const(mKey, "MAX", INT2NUM(KEY_MAX));
#endif
    {
	int c;
	char name[] = "KEY_CTRL_x";
	for (c = 'A'; c <= 'Z'; c++) {
	    name[sizeof(name) - 2] = c;
	    rb_define_const(mCurses, name, INT2FIX(c - 'A' + 1));
	}
    }
#ifdef PDC_KEY_MODIFIER_SHIFT
    /* PDCurses-specific keys */
    rb_curses_define_const(ALT_0);
    rb_curses_define_const(ALT_1);
    rb_curses_define_const(ALT_2);
    rb_curses_define_const(ALT_3);
    rb_curses_define_const(ALT_4);
    rb_curses_define_const(ALT_5);
    rb_curses_define_const(ALT_6);
    rb_curses_define_const(ALT_7);
    rb_curses_define_const(ALT_8);
    rb_curses_define_const(ALT_9);
    rb_curses_define_const(ALT_A);
    rb_curses_define_const(ALT_B);
    rb_curses_define_const(ALT_C);
    rb_curses_define_const(ALT_D);
    rb_curses_define_const(ALT_E);
    rb_curses_define_const(ALT_F);
    rb_curses_define_const(ALT_G);
    rb_curses_define_const(ALT_H);
    rb_curses_define_const(ALT_I);
    rb_curses_define_const(ALT_J);
    rb_curses_define_const(ALT_K);
    rb_curses_define_const(ALT_L);
    rb_curses_define_const(ALT_M);
    rb_curses_define_const(ALT_N);
    rb_curses_define_const(ALT_O);
    rb_curses_define_const(ALT_P);
    rb_curses_define_const(ALT_Q);
    rb_curses_define_const(ALT_R);
    rb_curses_define_const(ALT_S);
    rb_curses_define_const(ALT_T);
    rb_curses_define_const(ALT_U);
    rb_curses_define_const(ALT_V);
    rb_curses_define_const(ALT_W);
    rb_curses_define_const(ALT_X);
    rb_curses_define_const(ALT_Y);
    rb_curses_define_const(ALT_Z);
    rb_curses_define_const(PDC_KEY_MODIFIER_SHIFT);
    rb_curses_define_const(PDC_KEY_MODIFIER_CONTROL);
    rb_curses_define_const(PDC_KEY_MODIFIER_ALT);
    rb_curses_define_const(PDC_KEY_MODIFIER_NUMLOCK);
#endif

#ifdef HAVE_MENU
    rb_curses_define_const(O_ONEVALUE);
    rb_curses_define_const(O_SHOWDESC);
    rb_curses_define_const(O_ROWMAJOR);
    rb_curses_define_const(O_IGNORECASE);
    rb_curses_define_const(O_SHOWMATCH);
    rb_curses_define_const(O_NONCYCLIC);
#ifdef O_MOUSE_MENU
    rb_curses_define_const(O_MOUSE_MENU);
#endif
    rb_curses_define_const(O_SELECTABLE);

    rb_curses_define_const(REQ_LEFT_ITEM);
    rb_curses_define_const(REQ_RIGHT_ITEM);
    rb_curses_define_const(REQ_UP_ITEM);
    rb_curses_define_const(REQ_DOWN_ITEM);
    rb_curses_define_const(REQ_SCR_ULINE);
    rb_curses_define_const(REQ_SCR_DLINE);
    rb_curses_define_const(REQ_SCR_DPAGE);
    rb_curses_define_const(REQ_SCR_UPAGE);
    rb_curses_define_const(REQ_FIRST_ITEM);
    rb_curses_define_const(REQ_LAST_ITEM);
    rb_curses_define_const(REQ_NEXT_ITEM);
    rb_curses_define_const(REQ_PREV_ITEM);
    rb_curses_define_const(REQ_TOGGLE_ITEM);
    rb_curses_define_const(REQ_CLEAR_PATTERN);
    rb_curses_define_const(REQ_BACK_PATTERN);
    rb_curses_define_const(REQ_NEXT_MATCH);
    rb_curses_define_const(REQ_PREV_MATCH);
#endif

#ifdef HAVE_FORM
    rb_curses_define_const(O_VISIBLE);
    rb_curses_define_const(O_ACTIVE);
    rb_curses_define_const(O_PUBLIC);
    rb_curses_define_const(O_EDIT);
    rb_curses_define_const(O_WRAP);
    rb_curses_define_const(O_BLANK);
    rb_curses_define_const(O_AUTOSKIP);
    rb_curses_define_const(O_NULLOK);
    rb_curses_define_const(O_PASSOK);
    rb_curses_define_const(O_STATIC);
#ifdef O_DYNAMIC_JUSTIFY
    rb_curses_define_const(O_DYNAMIC_JUSTIFY);
#endif
#ifdef O_NO_LEFT_STRIP
    rb_curses_define_const(O_NO_LEFT_STRIP);
#endif

    rb_define_const(mCurses, "TYPE_ALPHA", INT2NUM(TYPE_CODE_ALPHA));
    rb_define_const(mCurses, "TYPE_ALNUM", INT2NUM(TYPE_CODE_ALNUM));
    rb_define_const(mCurses, "TYPE_ENUM", INT2NUM(TYPE_CODE_ENUM));
    rb_define_const(mCurses, "TYPE_INTEGER", INT2NUM(TYPE_CODE_INTEGER));
    rb_define_const(mCurses, "TYPE_NUMERIC", INT2NUM(TYPE_CODE_NUMERIC));
    rb_define_const(mCurses, "TYPE_REGEXP", INT2NUM(TYPE_CODE_REGEXP));

    rb_curses_define_const(REQ_NEXT_PAGE);
    rb_curses_define_const(REQ_PREV_PAGE);
    rb_curses_define_const(REQ_FIRST_PAGE);
    rb_curses_define_const(REQ_LAST_PAGE);

    rb_curses_define_const(REQ_NEXT_FIELD);
    rb_curses_define_const(REQ_PREV_FIELD);
    rb_curses_define_const(REQ_FIRST_FIELD);
    rb_curses_define_const(REQ_LAST_FIELD);
    rb_curses_define_const(REQ_SNEXT_FIELD);
    rb_curses_define_const(REQ_SPREV_FIELD);
    rb_curses_define_const(REQ_SFIRST_FIELD);
    rb_curses_define_const(REQ_SLAST_FIELD);
    rb_curses_define_const(REQ_LEFT_FIELD);
    rb_curses_define_const(REQ_RIGHT_FIELD);
    rb_curses_define_const(REQ_UP_FIELD);
    rb_curses_define_const(REQ_DOWN_FIELD);

    rb_curses_define_const(REQ_NEXT_CHAR);
    rb_curses_define_const(REQ_PREV_CHAR);
    rb_curses_define_const(REQ_NEXT_LINE);
    rb_curses_define_const(REQ_PREV_LINE);
    rb_curses_define_const(REQ_NEXT_WORD);
    rb_curses_define_const(REQ_PREV_WORD);
    rb_curses_define_const(REQ_BEG_FIELD);
    rb_curses_define_const(REQ_END_FIELD);
    rb_curses_define_const(REQ_BEG_LINE);
    rb_curses_define_const(REQ_END_LINE);
    rb_curses_define_const(REQ_LEFT_CHAR);
    rb_curses_define_const(REQ_RIGHT_CHAR);
    rb_curses_define_const(REQ_UP_CHAR);
    rb_curses_define_const(REQ_DOWN_CHAR);

    rb_curses_define_const(REQ_NEW_LINE);
    rb_curses_define_const(REQ_INS_CHAR);
    rb_curses_define_const(REQ_INS_LINE);
    rb_curses_define_const(REQ_DEL_CHAR);
    rb_curses_define_const(REQ_DEL_PREV);
    rb_curses_define_const(REQ_DEL_LINE);
    rb_curses_define_const(REQ_DEL_WORD);
    rb_curses_define_const(REQ_CLR_EOL);
    rb_curses_define_const(REQ_CLR_EOF);
    rb_curses_define_const(REQ_CLR_FIELD);
    rb_curses_define_const(REQ_OVL_MODE);
    rb_curses_define_const(REQ_INS_MODE);
    rb_curses_define_const(REQ_SCR_FLINE);
    rb_curses_define_const(REQ_SCR_BLINE);
    rb_curses_define_const(REQ_SCR_FPAGE);
    rb_curses_define_const(REQ_SCR_BPAGE);
    rb_curses_define_const(REQ_SCR_FHPAGE);
    rb_curses_define_const(REQ_SCR_BHPAGE);
    rb_curses_define_const(REQ_SCR_FCHAR);
    rb_curses_define_const(REQ_SCR_BCHAR);
    rb_curses_define_const(REQ_SCR_HFLINE);
    rb_curses_define_const(REQ_SCR_HBLINE);
    rb_curses_define_const(REQ_SCR_HFHALF);
    rb_curses_define_const(REQ_SCR_HBHALF);

    rb_curses_define_const(REQ_VALIDATION);
    rb_curses_define_const(REQ_NEXT_CHOICE);
    rb_curses_define_const(REQ_PREV_CHOICE);
#endif
#undef rb_curses_define_const
}
