window/wwdelete.c

   1 /*      $NetBSD: wwdelete.c,v 1.5 1997/11/21 08:37:11 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[] = "@(#)wwdelete.c  8.1 (Berkeley) 6/6/93";
  43 #else
  44 __RCSID("$NetBSD: wwdelete.c,v 1.5 1997/11/21 08:37:11 lukem Exp $");
  45 #endif
  46 #endif /* not lint */
  47
  48 #include "ww.h"
  49
  50 /*
  51  * Pull w free from the cover list.
  52  */
  53 void
  54 wwdelete(w)
  55         struct ww *w;
  56 {
  57         int i;
  58
  59         for (i = w->ww_i.t; i < w->ww_i.b; i++) {
  60                 int j;
  61                 unsigned char *smap = wwsmap[i];
  62                 union ww_char *ns = wwns[i];
  63                 int nchanged = 0;
  64
  65                 for (j = w->ww_i.l; j < w->ww_i.r; j++)
  66                         if (smap[j] == w->ww_index) {
  67                                 smap[j] = WWX_NOBODY;
  68                                 ns[j].c_w = ' ';
  69                                 nchanged++;
  70                         }
  71                 if (nchanged > 0)
  72                         wwtouched[i] |= WWU_TOUCHED;
  73         }
  74
  75         {
  76                 struct ww *wp;
  77
  78                 for (wp = w->ww_forw; wp != &wwhead; wp = wp->ww_forw)
  79                         wp->ww_order--;
  80         }
  81
  82         if (w->ww_forw != &wwhead)
  83                 wwdelete1(w->ww_forw,
  84                         w->ww_i.t, w->ww_i.b, w->ww_i.l, w->ww_i.r);
  85
  86         w->ww_back->ww_forw = w->ww_forw;
  87         w->ww_forw->ww_back = w->ww_back;
  88         w->ww_forw = w->ww_back = 0;
  89 }
  90
  91 void
  92 wwdelete1(w, t, b, l, r)
  93         struct ww *w;
  94         int t, b, l, r;
  95 {
  96         int i;
  97         int tt, bb, ll, rr;
  98         char hasglass;
  99
 100 again:
 101         hasglass = 0;
 102         tt = MAX(t, w->ww_i.t);
 103         bb = MIN(b, w->ww_i.b);
 104         ll = MAX(l, w->ww_i.l);
 105         rr = MIN(r, w->ww_i.r);
 106         if (tt >= bb || ll >= rr) {
 107                 if ((w = w->ww_forw) == &wwhead)
 108                         return;
 109                 goto again;
 110         }
 111         for (i = tt; i < bb; i++) {
 112                 int j;
 113                 unsigned char *smap = wwsmap[i];
 114                 union ww_char *ns = wwns[i];
 115                 char *win = w->ww_win[i];
 116                 union ww_char *buf = w->ww_buf[i];
 117                 int nvis = w->ww_nvis[i];
 118                 int nchanged = 0;
 119
 120                 for (j = ll; j < rr; j++) {
 121                         if (smap[j] != WWX_NOBODY)
 122                                 continue;
 123                         if (win[j] & WWM_GLS) {
 124                                 hasglass = 1;
 125                                 continue;
 126                         }
 127                         smap[j] = w->ww_index;
 128                         ns[j].c_w = buf[j].c_w ^ win[j] << WWC_MSHIFT;
 129                         nchanged++;
 130                         if (win[j] == 0)
 131                                 nvis++;
 132                 }
 133                 if (nchanged > 0)
 134                         wwtouched[i] |= WWU_TOUCHED;
 135                 w->ww_nvis[i] = nvis;
 136         }
 137         if ((w = w->ww_forw) == &wwhead)
 138                 return;
 139         if (hasglass)
 140                 goto again;
 141         if (tt > t)
 142                 wwdelete1(w, t, tt, l, r);
 143         if (bb < b)
 144                 wwdelete1(w, bb, b, l, r);
 145         if (ll > l)
 146                 wwdelete1(w, tt, bb, l, ll);
 147         if (rr < r)
 148                 wwdelete1(w, tt, bb, rr, r);
 149 }