window/wwdelchar.c

   1 /*      $NetBSD: wwdelchar.c,v 1.5 1997/11/21 08:37:10 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[] = "@(#)wwdelchar.c 8.1 (Berkeley) 6/6/93";
  43 #else
  44 __RCSID("$NetBSD: wwdelchar.c,v 1.5 1997/11/21 08:37:10 lukem Exp $");
  45 #endif
  46 #endif /* not lint */
  47
  48 #include "ww.h"
  49 #include "tt.h"
  50 #include "xx.h"
  51
  52 void
  53 wwdelchar(w, row, col)
  54         struct ww *w;
  55         int row, col;
  56 {
  57         int i;
  58         int nvis;
  59
  60         /*
  61          * First, shift the line.
  62          */
  63         {
  64                 union ww_char *p, *q;
  65
  66                 p = &w->ww_buf[row][col];
  67                 q = p + 1;
  68                 for (i = w->ww_b.r - col; --i > 0;)
  69                         *p++ = *q++;
  70                 p->c_w = ' ';
  71         }
  72
  73         /*
  74          * If can't see it, just return.
  75          */
  76         if (row < w->ww_i.t || row >= w->ww_i.b
  77             || w->ww_i.r <= 0 || w->ww_i.r <= col)
  78                 return;
  79
  80         if (col < w->ww_i.l)
  81                 col = w->ww_i.l;
  82
  83         /*
  84          * Now find out how much is actually changed, and fix wwns.
  85          */
  86         {
  87                 union ww_char *buf;
  88                 char *win;
  89                 union ww_char *ns;
  90                 unsigned char *smap;
  91                 char touched;
  92
  93                 nvis = 0;
  94                 smap = &wwsmap[row][col];
  95                 for (i = col; i < w->ww_i.r && *smap++ != w->ww_index; i++)
  96                         ;
  97                 if (i >= w->ww_i.r)
  98                         return;
  99                 col = i;
 100                 buf = w->ww_buf[row];
 101                 win = w->ww_win[row];
 102                 ns = wwns[row];
 103                 smap = &wwsmap[row][i];
 104                 touched = wwtouched[row];
 105                 for (; i < w->ww_i.r; i++) {
 106                         if (*smap++ != w->ww_index)
 107                                 continue;
 108                         touched |= WWU_TOUCHED;
 109                         if (win[i])
 110                                 ns[i].c_w =
 111                                         buf[i].c_w ^ win[i] << WWC_MSHIFT;
 112                         else {
 113                                 nvis++;
 114                                 ns[i] = buf[i];
 115                         }
 116                 }
 117                 wwtouched[row] = touched;
 118         }
 119
 120         /*
 121          * Can/Should we use delete character?
 122          */
 123         if (tt.tt_delchar != 0 && nvis > (wwncol - col) / 2) {
 124                 union ww_char *p, *q;
 125
 126                 xxdelchar(row, col);
 127                 p = &wwos[row][col];
 128                 q = p + 1;
 129                 for (i = wwncol - col; --i > 0;)
 130                         *p++ = *q++;
 131                 p->c_w = ' ';
 132         }
 133 }