/*	$NetBSD: mvwin.c,v 1.17 2012/09/28 06:03:45 blymn 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[] = "@(#)mvwin.c	8.2 (Berkeley) 5/4/94";
#else
__RCSID("$NetBSD: mvwin.c,v 1.17 2012/09/28 06:03:45 blymn Exp $");
#endif
#endif				/* not lint */

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

/*
 * mvderwin --
 *      Move a derived window.  This does not change the physical screen
 * coordinates of the subwin, rather maps the characters in the subwin
 * sized part of the parent window starting at dy, dx into the subwin.
 *
 */
int
mvderwin(WINDOW *win, int dy, int dx)
{
	WINDOW *parent;
	int x, y, i;
	__LINE *lp, *olp;
#ifdef HAVE_WCHAR
	__LDATA *cp;
	int j;
	nschar_t *np;
#endif /* HAVE_WCHAR */

	if (win == NULL)
		return ERR;

	parent = win->orig;

	if (parent == NULL)
		return ERR;

	if (((win->maxx + dx) > parent->maxx) ||
	    ((win->maxy + dy) > parent->maxy))
		return ERR;

	x = parent->begx + dx;
	y = parent->begy + dy;

	win->ch_off = x;
	/* Point the line pointers to line space */
	for (lp = win->lspace, i = 0; i < win->maxy; i++, lp++) {
		lp->flags = __ISDIRTY;
		win->alines[i] = lp;
		olp = parent->alines[i + dy];
#ifdef DEBUG
		lp->sentinel = SENTINEL_VALUE;
#endif
		lp->line = &olp->line[win->ch_off];
		lp->firstchp = &olp->firstch;
		lp->lastchp = &olp->lastch;
#ifndef HAVE_WCHAR
		lp->hash = __hash((char *)(void *)lp->line,
		    (size_t) (win->maxx * __LDATASIZE));
#else
		for (cp = lp->line, j = 0; j < win->maxx; j++, cp++) {
			lp->hash = __hash_more(&cp->ch, sizeof(wchar_t),
			    lp->hash);
			lp->hash = __hash_more(&cp->attr, sizeof(wchar_t),
			    lp->hash);
			if (cp->nsp) {
				np = cp->nsp;
				while (np) {
					lp->hash = __hash_more(&np->ch,
					    sizeof(wchar_t), lp->hash);
					np = np->next;
				}
			}
		}
#endif /* HAVE_WCHAR */
	}

	return OK;
}

/*
 * mvwin --
 *	Relocate the starting position of a window.
 */
int
mvwin(WINDOW *win, int by, int bx)
{
	WINDOW *orig;
	int     dy, dx;

	if (by < 0 || by + win->maxy > LINES || bx < 0 || bx + win->maxx > COLS)
		return (ERR);
	dy = by - win->begy;
	dx = bx - win->begx;
	orig = win->orig;
	if (orig == NULL) {
		orig = win;
		do {
			win->begy += dy;
			win->begx += dx;
			__swflags(win);
			win = win->nextp;
		} while (win != orig);
	} else {
		if (by < orig->begy || win->maxy + dy > orig->maxy)
			return (ERR);
		if (bx < orig->begx || win->maxx + dx > orig->maxx)
			return (ERR);
		win->begy = by;
		win->begx = bx;
		__swflags(win);
		__set_subwin(orig, win);
	}
	__touchwin(win);
	return (OK);
}
