usr.bin/window/wwadd.c

   1 /*      @(#)wwadd.c     8.1 (Berkeley) 6/6/93   */
   2 /*      $NetBSD: wwadd.c,v 1.7 2003/08/07 11:17:35 agc Exp $    */
   3
   4 /*
   5  * Copyright (c) 1983, 1993
   6  *      The Regents of the University of California.  All rights reserved.
   7  *
   8  * This code is derived from software contributed to Berkeley by
   9  * Edward Wang at The University of California, Berkeley.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  * 3. Neither the name of the University nor the names of its contributors
  20  *    may be used to endorse or promote products derived from this software
  21  *    without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  */
  35
  36 #include "ww.h"
  37
  38 /*
  39  * Stick w1 behind w2.
  40  */
  41 void
  42 wwadd(struct ww *w1, struct ww *w2)
  43 {
  44         int i;
  45         struct ww *w;
  46
  47         w1->ww_order = w2->ww_order + 1;
  48         w1->ww_back = w2;
  49         w1->ww_forw = w2->ww_forw;
  50         w2->ww_forw->ww_back = w1;
  51         w2->ww_forw = w1;
  52
  53         for (w = w1->ww_forw; w != &wwhead; w = w->ww_forw)
  54                 w->ww_order++;
  55         for (i = w1->ww_i.t; i < w1->ww_i.b; i++) {
  56                 int j;
  57                 unsigned char *smap = wwsmap[i];
  58                 char *win = w1->ww_win[i];
  59                 union ww_char *ns = wwns[i];
  60                 union ww_char *buf = w1->ww_buf[i];
  61                 int nvis = 0;
  62                 int nchanged = 0;
  63
  64                 for (j = w1->ww_i.l; j < w1->ww_i.r; j++) {
  65                         w = wwindex[smap[j]];
  66                         if (w1->ww_order > w->ww_order)
  67                                 continue;
  68                         if (win[j] & WWM_GLS)
  69                                 continue;
  70                         if (w != &wwnobody && w->ww_win[i][j] == 0)
  71                                 w->ww_nvis[i]--;
  72                         smap[j] = w1->ww_index;
  73                         if (win[j] == 0)
  74                                 nvis++;
  75                         ns[j].c_w = buf[j].c_w ^ win[j] << WWC_MSHIFT;
  76                         nchanged++;
  77                 }
  78                 if (nchanged > 0)
  79                         wwtouched[i] |= WWU_TOUCHED;
  80                 w1->ww_nvis[i] = nvis;
  81         }
  82 }