usr.bin/window/wwinschar.c

   1 /*      @(#)wwinschar.c 8.1 (Berkeley) 6/6/93   */
   2 /*      $NetBSD: wwinschar.c,v 1.7 2003/08/07 11:17:40 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 wwinschar(struct ww *w, int row, int col, char c, char m)
  42 {
  43         int i;
  44         int nvis;
  45         short x = c | m << WWC_MSHIFT;
  46
  47         /*
  48          * First, shift the line.
  49          */
  50         {
  51                 union ww_char *p, *q;
  52
  53                 p = &w->ww_buf[row][w->ww_b.r];
  54                 q = p - 1;
  55                 for (i = w->ww_b.r - col; --i > 0;)
  56                         *--p = *--q;
  57                 q->c_w = x;
  58         }
  59
  60         /*
  61          * If can't see it, just return.
  62          */
  63         if (row < w->ww_i.t || row >= w->ww_i.b
  64             || w->ww_i.r <= 0 || w->ww_i.r <= col)
  65                 return;
  66
  67         if (col < w->ww_i.l)
  68                 col = w->ww_i.l;
  69
  70         /*
  71          * Now find out how much is actually changed, and fix wwns.
  72          */
  73         {
  74                 union ww_char *buf;
  75                 char *win;
  76                 union ww_char *ns;
  77                 unsigned char *smap;
  78                 char touched;
  79
  80                 nvis = 0;
  81                 smap = &wwsmap[row][col];
  82                 for (i = col; i < w->ww_i.r && *smap++ != w->ww_index; i++)
  83                         ;
  84                 if (i >= w->ww_i.r)
  85                         return;
  86                 col = i;
  87                 buf = w->ww_buf[row];
  88                 win = w->ww_win[row];
  89                 ns = wwns[row];
  90                 smap = &wwsmap[row][i];
  91                 touched = wwtouched[row];
  92                 for (; i < w->ww_i.r; i++) {
  93                         if (*smap++ != w->ww_index)
  94                                 continue;
  95                         touched |= WWU_TOUCHED;
  96                         if (win[i])
  97                                 ns[i].c_w =
  98                                         buf[i].c_w ^ win[i] << WWC_MSHIFT;
  99                         else {
 100                                 nvis++;
 101                                 ns[i] = buf[i];
 102                         }
 103                 }
 104                 wwtouched[row] = touched;
 105         }
 106
 107         /*
 108          * Can/Should we use delete character?
 109          */
 110         if ((tt.tt_inschar || tt.tt_insspace) && nvis > (wwncol - col) / 2) {
 111                 union ww_char *p, *q;
 112
 113                 if (tt.tt_inschar)
 114                         xxinschar(row, col, c, m);
 115                 else {
 116                         xxinsspace(row, col);
 117                         x = ' ';
 118                 }
 119                 p = &wwos[row][wwncol];
 120                 q = p - 1;
 121                 for (i = wwncol - col; --i > 0;)
 122                         *--p = *--q;
 123                 q->c_w = x;
 124         }
 125 }