usr.bin/window/wwdelchar.c

   1 /*      @(#)wwdelchar.c 8.1 (Berkeley) 6/6/93   */
   2 /*      $NetBSD: wwdelchar.c,v 1.7 2003/08/07 11:17:38 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 #include "tt.h"
  38 #include "xx.h"
  39
  40 void
  41 wwdelchar(struct ww *w, int row, int col)
  42 {
  43         int i;
  44         int nvis;
  45
  46         /*
  47          * First, shift the line.
  48          */
  49         {
  50                 union ww_char *p, *q;
  51
  52                 p = &w->ww_buf[row][col];
  53                 q = p + 1;
  54                 for (i = w->ww_b.r - col; --i > 0;)
  55                         *p++ = *q++;
  56                 p->c_w = ' ';
  57         }
  58
  59         /*
  60          * If can't see it, just return.
  61          */
  62         if (row < w->ww_i.t || row >= w->ww_i.b
  63             || w->ww_i.r <= 0 || w->ww_i.r <= col)
  64                 return;
  65
  66         if (col < w->ww_i.l)
  67                 col = w->ww_i.l;
  68
  69         /*
  70          * Now find out how much is actually changed, and fix wwns.
  71          */
  72         {
  73                 union ww_char *buf;
  74                 char *win;
  75                 union ww_char *ns;
  76                 unsigned char *smap;
  77                 char touched;
  78
  79                 nvis = 0;
  80                 smap = &wwsmap[row][col];
  81                 for (i = col; i < w->ww_i.r && *smap++ != w->ww_index; i++)
  82                         ;
  83                 if (i >= w->ww_i.r)
  84                         return;
  85                 col = i;
  86                 buf = w->ww_buf[row];
  87                 win = w->ww_win[row];
  88                 ns = wwns[row];
  89                 smap = &wwsmap[row][i];
  90                 touched = wwtouched[row];
  91                 for (; i < w->ww_i.r; i++) {
  92                         if (*smap++ != w->ww_index)
  93                                 continue;
  94                         touched |= WWU_TOUCHED;
  95                         if (win[i])
  96                                 ns[i].c_w =
  97                                         buf[i].c_w ^ win[i] << WWC_MSHIFT;
  98                         else {
  99                                 nvis++;
 100                                 ns[i] = buf[i];
 101                         }
 102                 }
 103                 wwtouched[row] = touched;
 104         }
 105
 106         /*
 107          * Can/Should we use delete character?
 108          */
 109         if (tt.tt_delchar != 0 && nvis > (wwncol - col) / 2) {
 110                 union ww_char *p, *q;
 111
 112                 xxdelchar(row, col);
 113                 p = &wwos[row][col];
 114                 q = p + 1;
 115                 for (i = wwncol - col; --i > 0;)
 116                         *p++ = *q++;
 117                 p->c_w = ' ';
 118         }
 119 }