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[unix-history] / usr / src / usr.bin / window / wwadd.c

#ifndef lint
static char sccsid[] = "@(#)wwadd.c     3.9 %G%";
#endif

/*
* Copyright (c) 1983 Regents of the University of California,
* All rights reserved.  Redistribution permitted subject to
* the terms of the Berkeley Software License Agreement.
*/

#include "ww.h"

/*
* Stick w1 behind w2.
*/
wwadd(w1, w2)
register struct ww *w1;
struct ww *w2;
{
       register i;
       register struct ww *w;

       w1->ww_order = w2->ww_order + 1;
       w1->ww_back = w2;
       w1->ww_forw = w2->ww_forw;
       w2->ww_forw->ww_back = w1;
       w2->ww_forw = w1;

       for (w = w1->ww_forw; w != &wwhead; w = w->ww_forw)
               w->ww_order++;
       for (i = w1->ww_i.t; i < w1->ww_i.b; i++) {
               register j;
               register char *smap = wwsmap[i];
               register char *win = w1->ww_win[i];
               union ww_char *ns = wwns[i];
               union ww_char *buf = w1->ww_buf[i];
               int nvis = 0;
               int nchanged = 0;

               for (j = w1->ww_i.l; j < w1->ww_i.r; j++) {
                       w = wwindex[smap[j]];
                       if (w1->ww_order > w->ww_order)
                               continue;
                       if (win[j] & WWM_GLS)
                               continue;
                       if (w != &wwnobody && w->ww_win[i][j] == 0)
                               w->ww_nvis[i]--;
                       smap[j] = w1->ww_index;
                       if (win[j] == 0)
                               nvis++;
                       ns[j].c_w = buf[j].c_w ^ win[j] << WWC_MSHIFT;
                       nchanged++;
               }
               if (nchanged > 4)
                       wwtouched[i] |= WWU_MAJOR|WWU_TOUCHED;
               else if (nchanged > 0)
                       wwtouched[i] |= WWU_TOUCHED;
               w1->ww_nvis[i] = nvis;
       }
}