lib/libcurses/mvwin.c

   1 /*      $NetBSD: mvwin.c,v 1.17 2012/09/28 06:03:45 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 1.17 2012/09/28 06:03:45 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, y, 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         y = parent->begy + dy;
  77
  78         win->ch_off = x;
  79         /* Point the line pointers to line space */
  80         for (lp = win->lspace, i = 0; i < win->maxy; i++, lp++) {
  81                 lp->flags = __ISDIRTY;
  82                 win->alines[i] = lp;
  83                 olp = parent->alines[i + dy];
  84 #ifdef DEBUG
  85                 lp->sentinel = SENTINEL_VALUE;
  86 #endif
  87                 lp->line = &olp->line[win->ch_off];
  88                 lp->firstchp = &olp->firstch;
  89                 lp->lastchp = &olp->lastch;
  90 #ifndef HAVE_WCHAR
  91                 lp->hash = __hash((char *)(void *)lp->line,
  92                     (size_t) (win->maxx * __LDATASIZE));
  93 #else
  94                 for (cp = lp->line, j = 0; j < win->maxx; j++, cp++) {
  95                         lp->hash = __hash_more(&cp->ch, sizeof(wchar_t),
  96                             lp->hash);
  97                         lp->hash = __hash_more(&cp->attr, sizeof(wchar_t),
  98                             lp->hash);
  99                         if (cp->nsp) {
 100                                 np = cp->nsp;
 101                                 while (np) {
 102                                         lp->hash = __hash_more(&np->ch,
 103                                             sizeof(wchar_t), lp->hash);
 104                                         np = np->next;
 105                                 }
 106                         }
 107                 }
 108 #endif /* HAVE_WCHAR */
 109         }
 110
 111         return OK;
 112 }
 113
 114 /*
 115  * mvwin --
 116  *      Relocate the starting position of a window.
 117  */
 118 int
 119 mvwin(WINDOW *win, int by, int bx)
 120 {
 121         WINDOW *orig;
 122         int     dy, dx;
 123
 124         if (by < 0 || by + win->maxy > LINES || bx < 0 || bx + win->maxx > COLS)
 125                 return (ERR);
 126         dy = by - win->begy;
 127         dx = bx - win->begx;
 128         orig = win->orig;
 129         if (orig == NULL) {
 130                 orig = win;
 131                 do {
 132                         win->begy += dy;
 133                         win->begx += dx;
 134                         __swflags(win);
 135                         win = win->nextp;
 136                 } while (win != orig);
 137         } else {
 138                 if (by < orig->begy || win->maxy + dy > orig->maxy)
 139                         return (ERR);
 140                 if (bx < orig->begx || win->maxx + dx > orig->maxx)
 141                         return (ERR);
 142                 win->begy = by;
 143                 win->begx = bx;
 144                 __swflags(win);
 145                 __set_subwin(orig, win);
 146         }
 147         __touchwin(win);
 148         return (OK);
 149 }