usr/src/lib/libcurses/screen/wsyncdown.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 /*
  23  * Copyright 1997 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 /*      Copyright (c) 1988 AT&T */
  28 /*        All Rights Reserved   */
  29
  30 /*
  31  * University Copyright- Copyright (c) 1982, 1986, 1988
  32  * The Regents of the University of California
  33  * All Rights Reserved
  34  *
  35  * University Acknowledgment- Portions of this document are derived from
  36  * software developed by the University of California, Berkeley, and its
  37  * contributors.
  38  */
  39
  40 #pragma ident   "%Z%%M% %I%     %E% SMI"
  41
  42 /*LINTLIBRARY*/
  43
  44 #include        <sys/types.h>
  45 #include        "curses_inc.h"
  46
  47 /* Make the changes in ancestors visible in win. */
  48
  49 void
  50 wsyncdown(WINDOW *win)
  51 {
  52         short   *wbch, *wech, *pbch, *pech, bch, ech, endx;
  53         int     wy, px, py, endy;
  54         WINDOW  *par;
  55
  56         py = win->_pary;
  57         px = win->_parx;
  58         endy = win->_maxy;
  59         endx = win->_maxx - 1;
  60
  61         for (par = win->_parent; par != NULL; par = par->_parent) {
  62                 if (par->_flags & (_WINCHANGED | _WIN_ADD_ONE |
  63                     _WIN_INS_ONE)) {
  64                         wbch = win->_firstch;
  65                         wech = win->_lastch;
  66                         pbch = par->_firstch + py;
  67                         pech = par->_lastch + py;
  68
  69                         for (wy = 0; wy < endy; ++wy, ++wbch, ++wech,
  70                             ++pbch, ++pech) {
  71                                 if (*pbch != _INFINITY) {
  72                                         if ((bch = *pbch - px) < 0)
  73                                                 bch = 0;
  74                                         if ((ech = *pech - px) > endx)
  75                                                 ech = endx;
  76                                         if (!(bch > endx || ech < 0)) {
  77                                                 if (*wbch > bch)
  78                                                         *wbch = bch;
  79                                                 if (*wech < ech)
  80                                                         *wech = ech;
  81                                         }
  82                                 }
  83                         }
  84                         win->_flags |= _WINCHANGED;
  85                 }
  86
  87                 py += par->_pary;
  88                 px += par->_parx;
  89         }
  90 }