usr.bin/window/wwdelchar.c

   1 /*
   2  * Copyright (c) 1983, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * This code is derived from software contributed to Berkeley by
   6  * Edward Wang at The University of California, Berkeley.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. All advertising materials mentioning features or use of this software
  17  *    must display the following acknowledgement:
  18  *      This product includes software developed by the University of
  19  *      California, Berkeley and its contributors.
  20  * 4. Neither the name of the University nor the names of its contributors
  21  *    may be used to endorse or promote products derived from this software
  22  *    without specific prior written permission.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  34  * SUCH DAMAGE.
  35  *
  36  * @(#)wwdelchar.c      8.1 (Berkeley) 6/6/93
  37  * $FreeBSD: src/usr.bin/window/wwdelchar.c,v 1.1.1.1.14.1 2001/05/17 09:45:01 obrien Exp $
  38  * $DragonFly: src/usr.bin/window/wwdelchar.c,v 1.2 2003/06/17 06:29:34 dillon Exp $
  39  */
  40
  41 #include "ww.h"
  42 #include "tt.h"
  43
  44 wwdelchar(w, row, col)
  45 register struct ww *w;
  46 {
  47         register i;
  48         int nvis;
  49
  50         /*
  51          * First, shift the line.
  52          */
  53         {
  54                 register union ww_char *p, *q;
  55
  56                 p = &w->ww_buf[row][col];
  57                 q = p + 1;
  58                 for (i = w->ww_b.r - col; --i > 0;)
  59                         *p++ = *q++;
  60                 p->c_w = ' ';
  61         }
  62
  63         /*
  64          * If can't see it, just return.
  65          */
  66         if (row < w->ww_i.t || row >= w->ww_i.b
  67             || w->ww_i.r <= 0 || w->ww_i.r <= col)
  68                 return;
  69
  70         if (col < w->ww_i.l)
  71                 col = w->ww_i.l;
  72
  73         /*
  74          * Now find out how much is actually changed, and fix wwns.
  75          */
  76         {
  77                 register union ww_char *buf;
  78                 register char *win;
  79                 register union ww_char *ns;
  80                 register char *smap;
  81                 char touched;
  82
  83                 nvis = 0;
  84                 smap = &wwsmap[row][col];
  85                 for (i = col; i < w->ww_i.r && *smap++ != w->ww_index; i++)
  86                         ;
  87                 if (i >= w->ww_i.r)
  88                         return;
  89                 col = i;
  90                 buf = w->ww_buf[row];
  91                 win = w->ww_win[row];
  92                 ns = wwns[row];
  93                 smap = &wwsmap[row][i];
  94                 touched = wwtouched[row];
  95                 for (; i < w->ww_i.r; i++) {
  96                         if (*smap++ != w->ww_index)
  97                                 continue;
  98                         touched |= WWU_TOUCHED;
  99                         if (win[i])
 100                                 ns[i].c_w =
 101                                         buf[i].c_w ^ win[i] << WWC_MSHIFT;
 102                         else {
 103                                 nvis++;
 104                                 ns[i] = buf[i];
 105                         }
 106                 }
 107                 wwtouched[row] = touched;
 108         }
 109
 110         /*
 111          * Can/Should we use delete character?
 112          */
 113         if (tt.tt_delchar != 0 && nvis > (wwncol - col) / 2) {
 114                 register union ww_char *p, *q;
 115
 116                 xxdelchar(row, col);
 117                 p = &wwos[row][col];
 118                 q = p + 1;
 119                 for (i = wwncol - col; --i > 0;)
 120                         *p++ = *q++;
 121                 p->c_w = ' ';
 122         }
 123 }