reorganize window management to allow display routines to set

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

#ifndef lint
static  char *sccsid = "@(#)wwadd.c     3.5 83/09/15";
#endif

#include "ww.h"

/*
* Stick w1 behind w2
* W1 should have an empty ww_cov map.
*/
wwadd(w1, w2)
register struct ww *w1, *w2;
{
       if (w1->ww_forw != 0 || w1->ww_back != 0)
               return;                         /* sanity */

       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;

       {
               register struct ww *wp;

               for (wp = w2; wp != &wwhead; wp = wp->ww_back)
                       wwcover(wp, w1);
               for (wp = w1->ww_forw; wp != &wwhead; wp = wp->ww_forw) {
                       wp->ww_order++;
                       wwcover(w1, wp);
               }
       }
       {
               int i = w1->ww_i.t;
               char *touched = &wwtouched[i];

               for (; i < w1->ww_i.b; i++, touched++) {
                       int j = w1->ww_i.l;
                       register char *win = &w1->ww_win[i][j];
                       register char *smap = &wwsmap[i][j];
                       register union ww_char *ns = &wwns[i][j];
                       register union ww_char *buf = &w1->ww_buf[i][j];

                       for (; j < w1->ww_i.r; j++) {
                               if ((*win & (WWM_GLS|WWM_COV)) == 0) {
                                       *touched = 1;
                                       *smap++ = w1->ww_index;
                                       ns++->c_w = buf++->c_w
                                               ^ *win++ << WWC_MSHIFT;
                               } else {
                                       smap++;
                                       ns++;
                                       win++;
                                       buf++;
                               }
                       }
               }
       }
}