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mvwin.c revision 1.18 
      1 /*	$NetBSD: mvwin.c,v 1.18 2013/10/18 19:53:59 christos 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 1.18 2013/10/18 19:53:59 christos 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 *lp, *olp;
     57 #ifdef HAVE_WCHAR
     58 	__LDATA *cp;
     59 	int j;
     60 	nschar_t *np;
     61 #endif /* HAVE_WCHAR */
     62 
     63 	if (win == NULL)
     64 		return ERR;
     65 
     66 	parent = win->orig;
     67 
     68 	if (parent == NULL)
     69 		return ERR;
     70 
     71 	if (((win->maxx + dx) > parent->maxx) ||
     72 	    ((win->maxy + dy) > parent->maxy))
     73 		return ERR;
     74 
     75 	x = parent->begx + dx;
     76 
     77 	win->ch_off = x;
     78 	/* Point the line pointers to line space */
     79 	for (lp = win->lspace, i = 0; i < win->maxy; i++, lp++) {
     80 		lp->flags = __ISDIRTY;
     81 		win->alines[i] = lp;
     82 		olp = parent->alines[i + dy];
     83 #ifdef DEBUG
     84 		lp->sentinel = SENTINEL_VALUE;
     85 #endif
     86 		lp->line = &olp->line[win->ch_off];
     87 		lp->firstchp = &olp->firstch;
     88 		lp->lastchp = &olp->lastch;
     89 #ifndef HAVE_WCHAR
     90 		lp->hash = __hash((char *)(void *)lp->line,
     91 		    (size_t) (win->maxx * __LDATASIZE));
     92 #else
     93 		for (cp = lp->line, j = 0; j < win->maxx; j++, cp++) {
     94 			lp->hash = __hash_more(&cp->ch, sizeof(wchar_t),
     95 			    lp->hash);
     96 			lp->hash = __hash_more(&cp->attr, sizeof(wchar_t),
     97 			    lp->hash);
     98 			if (cp->nsp) {
     99 				np = cp->nsp;
    100 				while (np) {
    101 					lp->hash = __hash_more(&np->ch,
    102 					    sizeof(wchar_t), lp->hash);
    103 					np = np->next;
    104 				}
    105 			}
    106 		}
    107 #endif /* HAVE_WCHAR */
    108 	}
    109 
    110 	return OK;
    111 }
    112 
    113 /*
    114  * mvwin --
    115  *	Relocate the starting position of a window.
    116  */
    117 int
    118 mvwin(WINDOW *win, int by, int bx)
    119 {
    120 	WINDOW *orig;
    121 	int     dy, dx;
    122 
    123 	if (by < 0 || by + win->maxy > LINES || bx < 0 || bx + win->maxx > COLS)
    124 		return (ERR);
    125 	dy = by - win->begy;
    126 	dx = bx - win->begx;
    127 	orig = win->orig;
    128 	if (orig == NULL) {
    129 		orig = win;
    130 		do {
    131 			win->begy += dy;
    132 			win->begx += dx;
    133 			__swflags(win);
    134 			win = win->nextp;
    135 		} while (win != orig);
    136 	} else {
    137 		if (by < orig->begy || win->maxy + dy > orig->maxy)
    138 			return (ERR);
    139 		if (bx < orig->begx || win->maxx + dx > orig->maxx)
    140 			return (ERR);
    141 		win->begy = by;
    142 		win->begx = bx;
    143 		__swflags(win);
    144 		__set_subwin(orig, win);
    145 	}
    146 	__touchwin(win);
    147 	return (OK);
    148 }
    149