usr.bin/window/wwinsline.c

   1 /*      @(#)wwinsline.c 8.1 (Berkeley) 6/6/93   */
   2 /*      $NetBSD: wwinsline.c,v 1.6 2003/08/07 11:17:40 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 void
  39 wwinsline(struct ww *w, int row)
  40 {
  41         int i;
  42         union ww_char **cpp, **cqq;
  43         union ww_char *cp;
  44         int row1, row2;
  45         char deleted;
  46         int visible;
  47
  48         /*
  49          * Scroll first.
  50          */
  51         if ((row1 = row) < w->ww_i.t) {
  52                 row1 = w->ww_i.t;
  53                 visible = 0;
  54         } else
  55                 visible = 1;
  56         if ((row2 = w->ww_b.b) > w->ww_i.b) {
  57                 row2 = w->ww_i.b;
  58         }
  59         deleted = wwscroll1(w, row1, row2, -1, visible);
  60
  61         /*
  62          * Fix the buffer.
  63          * But leave clearing the last line for wwclreol().
  64          */
  65         cpp = &w->ww_buf[w->ww_b.b];
  66         cqq = cpp - 1;
  67         cp = *cqq;
  68         for (i = w->ww_b.b - row; --i > 0;)
  69                 *--cpp = *--cqq;
  70         *cqq = cp;
  71
  72         /*
  73          * Now clear the last line.
  74          */
  75         if (visible)
  76                 wwclreol1(w, row, w->ww_b.l, deleted);
  77         else {
  78                 cp += w->ww_b.l;
  79                 for (i = w->ww_b.nc; --i >= 0;)
  80                         cp++->c_w = ' ';
  81         }
  82 }