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curses: fix ripoffline

When creating stdscr, ensure it's placed and sized in accordance with
lines ripped off.
LINES is no longer adjusted for lines ripped off.
POSIX makes no mention that it should be adjusted.
Bottom lines are now placed correctly.
Lines ripped off are now displayed after calling initscr.

ok kamil@

Fixes PR #53635

/*	$NetBSD: screen.c,v 1.34 2018/10/02 17:35:44 roy Exp $	*/

/*
 * Copyright (c) 1981, 1993, 1994
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/cdefs.h>
#ifndef lint
#if 0
static char sccsid[] = "@(#)screen.c	8.2 (blymn) 11/27/2001";
#else
__RCSID("$NetBSD: screen.c,v 1.34 2018/10/02 17:35:44 roy Exp $");
#endif
#endif					/* not lint */

#include <stdlib.h>

#include "curses.h"
#include "curses_private.h"

static int filtered;

static void	 __delscreen(SCREEN *);

/*
 * filter has to be called before either initscr or newterm.
 */
void
filter(void)
{

	filtered = TRUE;
}

/*
 * set_term --
 *      Change the term to the given screen.
 *
 */
SCREEN *
set_term(SCREEN *new)
{
	SCREEN *old_screen = _cursesi_screen;

	if (_cursesi_screen != NULL) {
		  /* save changes made to the current screen... */
		old_screen->echoit = __echoit;
		old_screen->pfast = __pfast;
		old_screen->rawmode = __rawmode;
		old_screen->noqch = __noqch;
		old_screen->COLS = COLS;
		old_screen->LINES = LINES;
		old_screen->ESCDELAY = ESCDELAY;
		old_screen->TABSIZE = TABSIZE;
		old_screen->COLORS = COLORS;
		old_screen->COLOR_PAIRS = COLOR_PAIRS;
		old_screen->GT = __GT;
		old_screen->NONL = __NONL;
		old_screen->UPPERCASE = __UPPERCASE;
	}

	_cursesi_screen = new;

	__echoit = new->echoit;
        __pfast = new->pfast;
	__rawmode = new->rawmode;
	__noqch = new->noqch;
	COLS = new->COLS;
	LINES = new->LINES;
	ESCDELAY = new->ESCDELAY;
	TABSIZE = new->TABSIZE;
	COLORS = new->COLORS;
	COLOR_PAIRS = new->COLOR_PAIRS;
	__GT = new->GT;
	__NONL = new->NONL;
	__UPPERCASE = new->UPPERCASE;

	_cursesi_resetterm(new);

	curscr = new->curscr;
	clearok(curscr, new->clearok);
	stdscr = new->stdscr;
	__virtscr = new->__virtscr;

	_cursesi_reset_acs(new);
#ifdef HAVE_WCHAR
	_cursesi_reset_wacs(new);
#endif /* HAVE_WCHAR */

#ifdef DEBUG
	__CTRACE(__CTRACE_SCREEN, "set_term: LINES = %d, COLS = %d\n",
	    LINES, COLS);
#endif

	return old_screen;
}

/*
 * newterm --
 *      Set up a new screen.
 *
 */
SCREEN *
newterm(char *type, FILE *outfd, FILE *infd)
{
	SCREEN *new_screen;
	char *sp;

	sp = type;
	if (type == NULL && (sp = getenv("TERM")) == NULL)
		return NULL;

	if ((new_screen = calloc(1, sizeof(SCREEN))) == NULL)
		return NULL;

#ifdef DEBUG
	__CTRACE(__CTRACE_INIT, "newterm\n");
#endif

	new_screen->infd = infd;
	/*
	 * POSIX standard says this should be set to infd by default,
	 * but this seems to break nvi by leaving an unrefreshed screen.
	 * Also, the line breakout optimisation advertised in ncurses
	 * doesn't actually do anything, so explicitly disabling it here makes
	 * sense for the time being.
	 * A caller can always enable it by calling typeahead(3) anyway.
	 */
	new_screen->checkfd = -1; // fileno(infd);
	new_screen->outfd = outfd;
	new_screen->echoit = new_screen->nl = 1;
	new_screen->pfast = new_screen->rawmode = new_screen->noqch = 0;
	new_screen->filtered = filtered;
	filtered = FALSE; /* filter() must preceed each newterm() */
	new_screen->nca = A_NORMAL;
	new_screen->color_type = COLOR_NONE;
	new_screen->COLOR_PAIRS = 0;
	new_screen->old_mode = 2;
	new_screen->stdbuf = NULL;
	new_screen->stdscr = NULL;
	new_screen->curscr = NULL;
	new_screen->__virtscr = NULL;
	new_screen->curwin = 0;
	new_screen->notty = FALSE;
	new_screen->half_delay = FALSE;
	new_screen->resized = 0;
	new_screen->unget_len = 32;

	if ((new_screen->unget_list =
	    malloc(sizeof(wchar_t) * new_screen->unget_len)) == NULL)
	{
		goto error_exit;
	}
	new_screen->unget_pos = 0;

	if (_cursesi_gettmode(new_screen) == ERR)
		goto error_exit;

	if (_cursesi_setterm((char *)sp, new_screen) == ERR)
		goto error_exit;

	/* Need either homing or cursor motion for refreshes */
	if (!t_cursor_home(new_screen->term) &&
	    !t_cursor_address(new_screen->term))
		goto error_exit;

	new_screen->winlistp = NULL;

	if ((new_screen->curscr = __newwin(new_screen, 0,
	    0, 0, 0, FALSE, FALSE)) == NULL)
		goto error_exit;

	if ((new_screen->__virtscr = __newwin(new_screen, 0,
	    0, 0, 0, FALSE, FALSE)) == NULL)
		goto error_exit;

	/* If Soft Label Keys are setup, they will ripoffline. */
	if (__slk_init(new_screen) == ERR)
		goto error_exit;

	if (__ripoffscreen(new_screen) == ERR)
		goto error_exit;

	new_screen->stdscr = __newwin(new_screen, 0, 0, 0, 0, FALSE, TRUE);
	if (new_screen->stdscr == NULL)
		goto error_exit;

	clearok(new_screen->stdscr, 1);

	__init_getch(new_screen);
	__init_acs(new_screen);
#ifdef HAVE_WCHAR
	__init_get_wch(new_screen);
	__init_wacs(new_screen);
#endif /* HAVE_WCHAR */

	__set_stophandler();
	__set_winchhandler();

	  /*
	   * bleh - it seems that apps expect the first newterm to set
	   * up the curses screen.... emulate this.
	   */
	if (_cursesi_screen == NULL || _cursesi_screen->endwin) {
		set_term(new_screen);
	}

#ifdef DEBUG
	__CTRACE(__CTRACE_SCREEN, "newterm: LINES = %d, COLS = %d\n",
	    LINES, COLS);
#endif
	__startwin(new_screen);

	return new_screen;

  error_exit:
	__delscreen(new_screen);
	free(new_screen->unget_list);

	free(new_screen);
	return NULL;
}

/*
 * delscreen --
 *   Free resources used by the given screen and destroy it.
 *
 */
void
delscreen(SCREEN *screen)
{

#ifdef DEBUG
	__CTRACE(__CTRACE_SCREEN, "delscreen(%p)\n", screen);
#endif

	__delscreen(screen);

	  /* free the storage of the keymaps */
	_cursesi_free_keymap(screen->base_keymap);

	  /* free the Soft Label Keys */
	__slk_free(screen);

	free(screen->stdbuf);
	free(screen->unget_list);
	if (_cursesi_screen == screen)
		_cursesi_screen = NULL;
	free(screen);
}

static void
__delscreen(SCREEN *screen)
{
        struct __winlist *list;

	  /* free up the terminfo stuff */
	if (screen->term != NULL)
		del_curterm(screen->term);

	  /* walk the window list and kill all the parent windows */
	while ((list = screen->winlistp) != NULL) {
		delwin(list->winp);
		if (list == screen->winlistp)
			/* sanity - abort if window didn't remove itself */
			break;
	}
}