usr/src/lib/libcurses/screen/wtouchln.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 /*
  48  * Make a number of lines look like they have/have not been changed.
  49  * y: the start line
  50  * n: the number of lines affected
  51  * changed:     1: changed
  52  *              0: not changed
  53  *              -1: changed. Called internally - In this mode
  54  *              even REDRAW lines are changed.
  55  */
  56
  57 int
  58 wtouchln(WINDOW *win, int y, int n, int changed)
  59 {
  60         short   *firstch, *lastch, b, e;
  61         int     maxy = win->_maxy;
  62
  63         if (y >= maxy)
  64                 return (ERR);
  65         if (y < 0)
  66                 y = 0;
  67         if ((y + n) > maxy)
  68                 n = maxy - y;
  69         firstch = win->_firstch + y;
  70         lastch = win->_lastch + y;
  71         if (changed) {
  72                 win->_flags |= _WINCHANGED;
  73                 b = 0;
  74                 e = win->_maxx - 1;
  75         } else {
  76                 b = _INFINITY;
  77                 e = -1;
  78                 win->_flags &= ~_WINCHANGED;
  79         }
  80
  81         for (; n-- > 0; firstch++, lastch++) {
  82                 if (changed == -1 || *firstch != _REDRAW)
  83                         *firstch = b, *lastch = e;
  84         }
  85
  86         if ((changed == 1) && win->_sync)
  87                 wsyncup(win);
  88
  89         return (((changed == 1) && win->_immed) ? wrefresh(win) : OK);
  90 }