usr.bin/window/wwadd.c

   1 /*
   2  * Copyright (c) 1983, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * This code is derived from software contributed to Berkeley by
   6  * Edward Wang at The University of California, Berkeley.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. All advertising materials mentioning features or use of this software
  17  *    must display the following acknowledgement:
  18  *      This product includes software developed by the University of
  19  *      California, Berkeley and its contributors.
  20  * 4. Neither the name of the University nor the names of its contributors
  21  *    may be used to endorse or promote products derived from this software
  22  *    without specific prior written permission.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  34  * SUCH DAMAGE.
  35  *
  36  * @(#)wwadd.c  8.1 (Berkeley) 6/6/93
  37  * $FreeBSD: src/usr.bin/window/wwadd.c,v 1.1.1.1.14.1 2001/05/17 09:45:01 obrien Exp $
  38  * $DragonFly: src/usr.bin/window/wwadd.c,v 1.2 2003/06/17 04:29:34 dillon Exp $
  39  */
  40
  41 #include "ww.h"
  42
  43 /*
  44  * Stick w1 behind w2.
  45  */
  46 wwadd(w1, w2)
  47 register struct ww *w1;
  48 struct ww *w2;
  49 {
  50         register i;
  51         register struct ww *w;
  52
  53         w1->ww_order = w2->ww_order + 1;
  54         w1->ww_back = w2;
  55         w1->ww_forw = w2->ww_forw;
  56         w2->ww_forw->ww_back = w1;
  57         w2->ww_forw = w1;
  58
  59         for (w = w1->ww_forw; w != &wwhead; w = w->ww_forw)
  60                 w->ww_order++;
  61         for (i = w1->ww_i.t; i < w1->ww_i.b; i++) {
  62                 register j;
  63                 register char *smap = wwsmap[i];
  64                 register char *win = w1->ww_win[i];
  65                 union ww_char *ns = wwns[i];
  66                 union ww_char *buf = w1->ww_buf[i];
  67                 int nvis = 0;
  68                 int nchanged = 0;
  69
  70                 for (j = w1->ww_i.l; j < w1->ww_i.r; j++) {
  71                         w = wwindex[smap[j]];
  72                         if (w1->ww_order > w->ww_order)
  73                                 continue;
  74                         if (win[j] & WWM_GLS)
  75                                 continue;
  76                         if (w != &wwnobody && w->ww_win[i][j] == 0)
  77                                 w->ww_nvis[i]--;
  78                         smap[j] = w1->ww_index;
  79                         if (win[j] == 0)
  80                                 nvis++;
  81                         ns[j].c_w = buf[j].c_w ^ win[j] << WWC_MSHIFT;
  82                         nchanged++;
  83                 }
  84                 if (nchanged > 0)
  85                         wwtouched[i] |= WWU_TOUCHED;
  86                 w1->ww_nvis[i] = nvis;
  87         }
  88 }