usr.bin/window/wwinsline.c

   1 /*      $NetBSD: wwinsline.c,v 1.6 2003/08/07 11:17:40 agc 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. Neither the name of the University nor the names of its contributors
  19  *    may be used to endorse or promote products derived from this software
  20  *    without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  */
  34
  35 #include <sys/cdefs.h>
  36 #ifndef lint
  37 #if 0
  38 static char sccsid[] = "@(#)wwinsline.c 8.1 (Berkeley) 6/6/93";
  39 #else
  40 __RCSID("$NetBSD: wwinsline.c,v 1.6 2003/08/07 11:17:40 agc Exp $");
  41 #endif
  42 #endif /* not lint */
  43
  44 #include "ww.h"
  45
  46 void
  47 wwinsline(struct ww *w, int row)
  48 {
  49         int i;
  50         union ww_char **cpp, **cqq;
  51         union ww_char *cp;
  52         int row1, row2;
  53         char deleted;
  54         int visible;
  55
  56         /*
  57          * Scroll first.
  58          */
  59         if ((row1 = row) < w->ww_i.t) {
  60                 row1 = w->ww_i.t;
  61                 visible = 0;
  62         } else
  63                 visible = 1;
  64         if ((row2 = w->ww_b.b) > w->ww_i.b) {
  65                 row2 = w->ww_i.b;
  66         }
  67         deleted = wwscroll1(w, row1, row2, -1, visible);
  68
  69         /*
  70          * Fix the buffer.
  71          * But leave clearing the last line for wwclreol().
  72          */
  73         cpp = &w->ww_buf[w->ww_b.b];
  74         cqq = cpp - 1;
  75         cp = *cqq;
  76         for (i = w->ww_b.b - row; --i > 0;)
  77                 *--cpp = *--cqq;
  78         *cqq = cp;
  79
  80         /*
  81          * Now clear the last line.
  82          */
  83         if (visible)
  84                 wwclreol1(w, row, w->ww_b.l, deleted);
  85         else {
  86                 cp += w->ww_b.l;
  87                 for (i = w->ww_b.nc; --i >= 0;)
  88                         cp++->c_w = ' ';
  89         }
  90 }