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      1 /*	$NetBSD: mvwin.c,v 1.25 2024/12/23 02:58:04 blymn Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1981, 1993, 1994
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. Neither the name of the University nor the names of its contributors
     16  *    may be used to endorse or promote products derived from this software
     17  *    without specific prior written permission.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     29  * SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 #ifndef lint
     34 #if 0
     35 static char sccsid[] = "@(#)mvwin.c	8.2 (Berkeley) 5/4/94";
     36 #else
     37 __RCSID("$NetBSD: mvwin.c,v 1.25 2024/12/23 02:58:04 blymn Exp $");
     38 #endif
     39 #endif				/* not lint */
     40 
     41 #include "curses.h"
     42 #include "curses_private.h"
     43 
     44 /*
     45  * mvderwin --
     46  *      Move a derived window.  This does not change the physical screen
     47  * coordinates of the subwin, rather maps the characters in the subwin
     48  * sized part of the parent window starting at dy, dx into the subwin.
     49  *
     50  */
     51 int
     52 mvderwin(WINDOW *win, int dy, int dx)
     53 {
     54 	WINDOW *parent;
     55 	int x, i;
     56 	__LINE *plp;
     57 
     58 	if (__predict_false(win == NULL))
     59 		return ERR;
     60 
     61 	parent = win->orig;
     62 
     63 	if (parent == NULL)
     64 		return ERR;
     65 
     66 	if (((win->maxx + dx) > parent->maxx) ||
     67 	    ((win->maxy + dy) > parent->maxy))
     68 		return ERR;
     69 
     70 	win->flags |= __ISDERWIN;
     71 	win->derx = dx;
     72 	win->dery = dy;
     73 
     74 	x = parent->begx + dx;
     75 
     76 	/*
     77 	 * Mark the source area for the derwin as changed so it will be
     78 	 * copied to the destination window on refresh.
     79 	 */
     80 	for (i = 0; i < win->maxy; i++) {
     81 		plp = parent->alines[i + dy];
     82 		plp->flags = __ISDIRTY;
     83 		if (*plp->firstchp > x)
     84 			*plp->firstchp = x;
     85 		if (*plp->lastchp < x + win->maxx)
     86 			*plp->lastchp = x + win->maxx;
     87 		__CTRACE(__CTRACE_REFRESH,
     88 		    "mvderwin: firstchp = %d, lastchp = %d\n",
     89 		    *plp->firstchp, *plp->lastchp);
     90 	}
     91 
     92 	return OK;
     93 }
     94 
     95 /*
     96  * mvwin --
     97  *	Relocate the starting position of a window.
     98  */
     99 int
    100 mvwin(WINDOW *win, int by, int bx)
    101 {
    102 	WINDOW *orig;
    103 	int     dy, dx;
    104 
    105 	if (__predict_false(win == NULL))
    106 		return ERR;
    107 
    108 	if (by < 0 || by + win->maxy > win->screen->LINES ||
    109 	    bx < 0 || bx + win->maxx > win->screen->COLS)
    110 		return ERR;
    111 	dy = by - win->begy;
    112 	dx = bx - win->begx;
    113 	orig = win->orig;
    114 	if (orig == NULL) {
    115 		orig = win;
    116 		do {
    117 			win->begy += dy;
    118 			win->begx += dx;
    119 			__swflags(win);
    120 			win = win->nextp;
    121 		} while (win != orig);
    122 	} else {
    123 		if (by < orig->begy || win->maxy + dy > orig->maxy)
    124 			return ERR;
    125 		if (bx < orig->begx || win->maxx + dx > orig->maxx)
    126 			return ERR;
    127 		win->begy = by;
    128 		win->begx = bx;
    129 		__swflags(win);
    130 		__set_subwin(orig, win);
    131 	}
    132 	__touchwin(win, 0);
    133 	return OK;
    134 }
    135