Now uses screen address for all buffers.

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

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

#include "ww.h"

wwinsline(w, row)
register struct ww *w;
int row;
{
       register i;
       register union ww_char **cpp, **cqq;
       register union ww_char *cp;
       int row1, row2;
       char deleted;
       int visible;

       /*
        * Scroll first.
        */
       if ((row1 = row) < w->ww_i.t) {
               row1 = w->ww_i.t;
               visible = 0;
       } else
               visible = 1;
       if ((row2 = w->ww_b.b) > w->ww_i.b) {
               row2 = w->ww_i.b;
       }
       deleted = wwscroll1(w, row1, row2, -1, visible);

       /*
        * Fix the buffer.
        * But leave clearing the last line for wwclreol().
        */
       cpp = &w->ww_buf[w->ww_b.b];
       cqq = cpp - 1;
       cp = *cqq;
       for (i = w->ww_b.b - row; --i > 0;)
               *--cpp = *--cqq;
       *cqq = cp;

       /*
        * Now clear the last line.
        */
       if (visible)
               wwclreol1(w, row, w->ww_b.l, deleted);
       else
               for (i = w->ww_b.nc; --i >= 0;)
                       cp++->c_w = ' ';
}