usr.bin/window/wwdelete.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
  37 #ifndef lint
  38 static char sccsid[] = "@(#)wwdelete.c  8.1 (Berkeley) 6/6/93";
  39 static char rcsid[] =
  40   "$FreeBSD$";
  41 #endif /* not lint */
  42
  43 #include "ww.h"
  44
  45 /*
  46  * Pull w free from the cover list.
  47  */
  48 wwdelete(w)
  49 register struct ww *w;
  50 {
  51         register i;
  52
  53         for (i = w->ww_i.t; i < w->ww_i.b; i++) {
  54                 register j;
  55                 register char *smap = wwsmap[i];
  56                 register union ww_char *ns = wwns[i];
  57                 register int nchanged = 0;
  58
  59                 for (j = w->ww_i.l; j < w->ww_i.r; j++)
  60                         if (smap[j] == w->ww_index) {
  61                                 smap[j] = WWX_NOBODY;
  62                                 ns[j].c_w = ' ';
  63                                 nchanged++;
  64                         }
  65                 if (nchanged > 0)
  66                         wwtouched[i] |= WWU_TOUCHED;
  67         }
  68
  69         {
  70                 register struct ww *wp;
  71
  72                 for (wp = w->ww_forw; wp != &wwhead; wp = wp->ww_forw)
  73                         wp->ww_order--;
  74         }
  75
  76         if (w->ww_forw != &wwhead)
  77                 wwdelete1(w->ww_forw,
  78                         w->ww_i.t, w->ww_i.b, w->ww_i.l, w->ww_i.r);
  79
  80         w->ww_back->ww_forw = w->ww_forw;
  81         w->ww_forw->ww_back = w->ww_back;
  82         w->ww_forw = w->ww_back = 0;
  83 }
  84
  85 wwdelete1(w, t, b, l, r)
  86 register struct ww *w;
  87 {
  88         int i;
  89         int tt, bb, ll, rr;
  90         char hasglass;
  91
  92 again:
  93         hasglass = 0;
  94         tt = MAX(t, w->ww_i.t);
  95         bb = MIN(b, w->ww_i.b);
  96         ll = MAX(l, w->ww_i.l);
  97         rr = MIN(r, w->ww_i.r);
  98         if (tt >= bb || ll >= rr) {
  99                 if ((w = w->ww_forw) == &wwhead)
 100                         return;
 101                 goto again;
 102         }
 103         for (i = tt; i < bb; i++) {
 104                 register j;
 105                 register char *smap = wwsmap[i];
 106                 register union ww_char *ns = wwns[i];
 107                 register char *win = w->ww_win[i];
 108                 register union ww_char *buf = w->ww_buf[i];
 109                 int nvis = w->ww_nvis[i];
 110                 int nchanged = 0;
 111
 112                 for (j = ll; j < rr; j++) {
 113                         if (smap[j] != WWX_NOBODY)
 114                                 continue;
 115                         if (win[j] & WWM_GLS) {
 116                                 hasglass = 1;
 117                                 continue;
 118                         }
 119                         smap[j] = w->ww_index;
 120                         ns[j].c_w = buf[j].c_w ^ win[j] << WWC_MSHIFT;
 121                         nchanged++;
 122                         if (win[j] == 0)
 123                                 nvis++;
 124                 }
 125                 if (nchanged > 0)
 126                         wwtouched[i] |= WWU_TOUCHED;
 127                 w->ww_nvis[i] = nvis;
 128         }
 129         if ((w = w->ww_forw) == &wwhead)
 130                 return;
 131         if (hasglass)
 132                 goto again;
 133         if (tt > t)
 134                 wwdelete1(w, t, tt, l, r);
 135         if (bb < b)
 136                 wwdelete1(w, bb, b, l, r);
 137         if (ll > l)
 138                 wwdelete1(w, tt, bb, l, ll);
 139         if (rr < r)
 140                 wwdelete1(w, tt, bb, rr, r);
 141 }