usr.bin/window/wwdelchar.c

   1 /*      $NetBSD: wwdelchar.c,v 1.6 2002/06/14 01:06:58 wiz 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[] = "@(#)wwdelchar.c 8.1 (Berkeley) 6/6/93";
  39 #else
  40 __RCSID("$NetBSD: wwdelchar.c,v 1.6 2002/06/14 01:06:58 wiz Exp $");
  41 #endif
  42 #endif /* not lint */
  43
  44 #include "ww.h"
  45 #include "tt.h"
  46 #include "xx.h"
  47
  48 void
  49 wwdelchar(struct ww *w, int row, int col)
  50 {
  51         int i;
  52         int nvis;
  53
  54         /*
  55          * First, shift the line.
  56          */
  57         {
  58                 union ww_char *p, *q;
  59
  60                 p = &w->ww_buf[row][col];
  61                 q = p + 1;
  62                 for (i = w->ww_b.r - col; --i > 0;)
  63                         *p++ = *q++;
  64                 p->c_w = ' ';
  65         }
  66
  67         /*
  68          * If can't see it, just return.
  69          */
  70         if (row < w->ww_i.t || row >= w->ww_i.b
  71             || w->ww_i.r <= 0 || w->ww_i.r <= col)
  72                 return;
  73
  74         if (col < w->ww_i.l)
  75                 col = w->ww_i.l;
  76
  77         /*
  78          * Now find out how much is actually changed, and fix wwns.
  79          */
  80         {
  81                 union ww_char *buf;
  82                 char *win;
  83                 union ww_char *ns;
  84                 unsigned char *smap;
  85                 char touched;
  86
  87                 nvis = 0;
  88                 smap = &wwsmap[row][col];
  89                 for (i = col; i < w->ww_i.r && *smap++ != w->ww_index; i++)
  90                         ;
  91                 if (i >= w->ww_i.r)
  92                         return;
  93                 col = i;
  94                 buf = w->ww_buf[row];
  95                 win = w->ww_win[row];
  96                 ns = wwns[row];
  97                 smap = &wwsmap[row][i];
  98                 touched = wwtouched[row];
  99                 for (; i < w->ww_i.r; i++) {
 100                         if (*smap++ != w->ww_index)
 101                                 continue;
 102                         touched |= WWU_TOUCHED;
 103                         if (win[i])
 104                                 ns[i].c_w =
 105                                         buf[i].c_w ^ win[i] << WWC_MSHIFT;
 106                         else {
 107                                 nvis++;
 108                                 ns[i] = buf[i];
 109                         }
 110                 }
 111                 wwtouched[row] = touched;
 112         }
 113
 114         /*
 115          * Can/Should we use delete character?
 116          */
 117         if (tt.tt_delchar != 0 && nvis > (wwncol - col) / 2) {
 118                 union ww_char *p, *q;
 119
 120                 xxdelchar(row, col);
 121                 p = &wwos[row][col];
 122                 q = p + 1;
 123                 for (i = wwncol - col; --i > 0;)
 124                         *p++ = *q++;
 125                 p->c_w = ' ';
 126         }
 127 }