usr.bin/window/wwinsline.c

   1 /*
   2  * Copyright (c) 1983, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * This code is derived from software contributed to Berkeley by
   6  * Edward Wang at The University of California, Berkeley.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. All advertising materials mentioning features or use of this software
  17  *    must display the following acknowledgement:
  18  *      This product includes software developed by the University of
  19  *      California, Berkeley and its contributors.
  20  * 4. Neither the name of the University nor the names of its contributors
  21  *    may be used to endorse or promote products derived from this software
  22  *    without specific prior written permission.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  34  * SUCH DAMAGE.
  35  *
  36  * @(#)wwinsline.c      8.1 (Berkeley) 6/6/93
  37  * $FreeBSD: src/usr.bin/window/wwinsline.c,v 1.1.1.1.14.1 2001/05/17 09:45:01 obrien Exp $
  38  * $DragonFly: src/usr.bin/window/wwinsline.c,v 1.2 2003/06/17 04:29:34 dillon Exp $
  39  */
  40
  41 #include "ww.h"
  42
  43 wwinsline(w, row)
  44 register struct ww *w;
  45 int row;
  46 {
  47         register i;
  48         register union ww_char **cpp, **cqq;
  49         register union ww_char *cp;
  50         int row1, row2;
  51         char deleted;
  52         int visible;
  53
  54         /*
  55          * Scroll first.
  56          */
  57         if ((row1 = row) < w->ww_i.t) {
  58                 row1 = w->ww_i.t;
  59                 visible = 0;
  60         } else
  61                 visible = 1;
  62         if ((row2 = w->ww_b.b) > w->ww_i.b) {
  63                 row2 = w->ww_i.b;
  64         }
  65         deleted = wwscroll1(w, row1, row2, -1, visible);
  66
  67         /*
  68          * Fix the buffer.
  69          * But leave clearing the last line for wwclreol().
  70          */
  71         cpp = &w->ww_buf[w->ww_b.b];
  72         cqq = cpp - 1;
  73         cp = *cqq;
  74         for (i = w->ww_b.b - row; --i > 0;)
  75                 *--cpp = *--cqq;
  76         *cqq = cp;
  77
  78         /*
  79          * Now clear the last line.
  80          */
  81         if (visible)
  82                 wwclreol1(w, row, w->ww_b.l, deleted);
  83         else {
  84                 cp += w->ww_b.l;
  85                 for (i = w->ww_b.nc; --i >= 0;)
  86                         cp++->c_w = ' ';
  87         }
  88 }