usr.bin/window/wwinschar.c

   1 /*      $NetBSD: wwinschar.c,v 1.6 2002/06/14 01:06:59 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[] = "@(#)wwinschar.c 8.1 (Berkeley) 6/6/93";
  39 #else
  40 __RCSID("$NetBSD: wwinschar.c,v 1.6 2002/06/14 01:06:59 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 wwinschar(struct ww *w, int row, int col, char c, char m)
  50 {
  51         int i;
  52         int nvis;
  53         short x = c | m << WWC_MSHIFT;
  54
  55         /*
  56          * First, shift the line.
  57          */
  58         {
  59                 union ww_char *p, *q;
  60
  61                 p = &w->ww_buf[row][w->ww_b.r];
  62                 q = p - 1;
  63                 for (i = w->ww_b.r - col; --i > 0;)
  64                         *--p = *--q;
  65                 q->c_w = x;
  66         }
  67
  68         /*
  69          * If can't see it, just return.
  70          */
  71         if (row < w->ww_i.t || row >= w->ww_i.b
  72             || w->ww_i.r <= 0 || w->ww_i.r <= col)
  73                 return;
  74
  75         if (col < w->ww_i.l)
  76                 col = w->ww_i.l;
  77
  78         /*
  79          * Now find out how much is actually changed, and fix wwns.
  80          */
  81         {
  82                 union ww_char *buf;
  83                 char *win;
  84                 union ww_char *ns;
  85                 unsigned char *smap;
  86                 char touched;
  87
  88                 nvis = 0;
  89                 smap = &wwsmap[row][col];
  90                 for (i = col; i < w->ww_i.r && *smap++ != w->ww_index; i++)
  91                         ;
  92                 if (i >= w->ww_i.r)
  93                         return;
  94                 col = i;
  95                 buf = w->ww_buf[row];
  96                 win = w->ww_win[row];
  97                 ns = wwns[row];
  98                 smap = &wwsmap[row][i];
  99                 touched = wwtouched[row];
 100                 for (; i < w->ww_i.r; i++) {
 101                         if (*smap++ != w->ww_index)
 102                                 continue;
 103                         touched |= WWU_TOUCHED;
 104                         if (win[i])
 105                                 ns[i].c_w =
 106                                         buf[i].c_w ^ win[i] << WWC_MSHIFT;
 107                         else {
 108                                 nvis++;
 109                                 ns[i] = buf[i];
 110                         }
 111                 }
 112                 wwtouched[row] = touched;
 113         }
 114
 115         /*
 116          * Can/Should we use delete character?
 117          */
 118         if ((tt.tt_inschar || tt.tt_insspace) && nvis > (wwncol - col) / 2) {
 119                 union ww_char *p, *q;
 120
 121                 if (tt.tt_inschar)
 122                         xxinschar(row, col, c, m);
 123                 else {
 124                         xxinsspace(row, col);
 125                         x = ' ';
 126                 }
 127                 p = &wwos[row][wwncol];
 128                 q = p - 1;
 129                 for (i = wwncol - col; --i > 0;)
 130                         *--p = *--q;
 131                 q->c_w = x;
 132         }
 133 }