window/wwinsline.c

   1 /*      $NetBSD: wwinsline.c,v 1.4 1997/11/21 08:37:29 lukem Exp $      */
   2
   3 /*
   4  * Copyright (c) 1983, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * This code is derived from software contributed to Berkeley by
   8  * Edward Wang at The University of California, Berkeley.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  * 3. All advertising materials mentioning features or use of this software
  19  *    must display the following acknowledgement:
  20  *      This product includes software developed by the University of
  21  *      California, Berkeley and its contributors.
  22  * 4. Neither the name of the University nor the names of its contributors
  23  *    may be used to endorse or promote products derived from this software
  24  *    without specific prior written permission.
  25  *
  26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  36  * SUCH DAMAGE.
  37  */
  38
  39 #include <sys/cdefs.h>
  40 #ifndef lint
  41 #if 0
  42 static char sccsid[] = "@(#)wwinsline.c 8.1 (Berkeley) 6/6/93";
  43 #else
  44 __RCSID("$NetBSD: wwinsline.c,v 1.4 1997/11/21 08:37:29 lukem Exp $");
  45 #endif
  46 #endif /* not lint */
  47
  48 #include "ww.h"
  49
  50 void
  51 wwinsline(w, row)
  52         struct ww *w;
  53         int row;
  54 {
  55         int i;
  56         union ww_char **cpp, **cqq;
  57         union ww_char *cp;
  58         int row1, row2;
  59         char deleted;
  60         int visible;
  61
  62         /*
  63          * Scroll first.
  64          */
  65         if ((row1 = row) < w->ww_i.t) {
  66                 row1 = w->ww_i.t;
  67                 visible = 0;
  68         } else
  69                 visible = 1;
  70         if ((row2 = w->ww_b.b) > w->ww_i.b) {
  71                 row2 = w->ww_i.b;
  72         }
  73         deleted = wwscroll1(w, row1, row2, -1, visible);
  74
  75         /*
  76          * Fix the buffer.
  77          * But leave clearing the last line for wwclreol().
  78          */
  79         cpp = &w->ww_buf[w->ww_b.b];
  80         cqq = cpp - 1;
  81         cp = *cqq;
  82         for (i = w->ww_b.b - row; --i > 0;)
  83                 *--cpp = *--cqq;
  84         *cqq = cp;
  85
  86         /*
  87          * Now clear the last line.
  88          */
  89         if (visible)
  90                 wwclreol1(w, row, w->ww_b.l, deleted);
  91         else {
  92                 cp += w->ww_b.l;
  93                 for (i = w->ww_b.nc; --i >= 0;)
  94                         cp++->c_w = ' ';
  95         }
  96 }