usr/src/usr.bin/window/wwdelline.c

#ifndef lint
static  char *sccsid = "@(#)wwdelline.c 3.4 83/09/14";
#endif

#include "ww.h"

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

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

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

        /*
         * Now clear the last line.
         */
        if (visible)
                wwclreol1(w, w->ww_nline - 1, 0, deleted);
        else
                for (i = w->ww_w.nc; --i >= 0;)
                        cp++->c_w = ' ';
}