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- /*
- * Copyright (c) 1983 Regents of the University of California.
- * All rights reserved.
- *
- * This code is derived from software contributed to Berkeley by
- * Edward Wang at The University of California, Berkeley.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
-
- #ifndef lint
- static char sccsid[] = "@(#)wwadd.c 3.14 (Berkeley) 6/6/90";
- #endif /* not lint */
-
- #include "ww.h"
-
- /*
- * Stick w1 behind w2.
- */
- wwadd(w1, w2)
- register struct ww *w1;
- struct ww *w2;
- {
- register i;
- register struct ww *w;
-
- w1->ww_order = w2->ww_order + 1;
- w1->ww_back = w2;
- w1->ww_forw = w2->ww_forw;
- w2->ww_forw->ww_back = w1;
- w2->ww_forw = w1;
-
- for (w = w1->ww_forw; w != &wwhead; w = w->ww_forw)
- w->ww_order++;
- for (i = w1->ww_i.t; i < w1->ww_i.b; i++) {
- register j;
- register char *smap = wwsmap[i];
- register char *win = w1->ww_win[i];
- union ww_char *ns = wwns[i];
- union ww_char *buf = w1->ww_buf[i];
- int nvis = 0;
- int nchanged = 0;
-
- for (j = w1->ww_i.l; j < w1->ww_i.r; j++) {
- w = wwindex[smap[j]];
- if (w1->ww_order > w->ww_order)
- continue;
- if (win[j] & WWM_GLS)
- continue;
- if (w != &wwnobody && w->ww_win[i][j] == 0)
- w->ww_nvis[i]--;
- smap[j] = w1->ww_index;
- if (win[j] == 0)
- nvis++;
- ns[j].c_w = buf[j].c_w ^ win[j] << WWC_MSHIFT;
- nchanged++;
- }
- if (nchanged > 0)
- wwtouched[i] |= WWU_TOUCHED;
- w1->ww_nvis[i] = nvis;
- }
- }
-