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Annotation of src/usr.bin/window/wwadd.c, Revision 1.4

1.4     ! downsj      1: /*     $OpenBSD$       */
1.2       niklas      2: /*     $NetBSD: wwadd.c,v 1.4 1996/02/08 21:48:56 mycroft Exp $        */
1.1       deraadt     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. All advertising materials mentioning features or use of this software
                     20:  *    must display the following acknowledgement:
                     21:  *     This product includes software developed by the University of
                     22:  *     California, Berkeley and its contributors.
                     23:  * 4. Neither the name of the University nor the names of its contributors
                     24:  *    may be used to endorse or promote products derived from this software
                     25:  *    without specific prior written permission.
                     26:  *
                     27:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     28:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     29:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     30:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     31:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     32:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     33:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     34:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     35:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     36:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     37:  * SUCH DAMAGE.
                     38:  */
                     39:
                     40: #ifndef lint
                     41: #if 0
                     42: static char sccsid[] = "@(#)wwadd.c    8.1 (Berkeley) 6/6/93";
                     43: #else
1.4     ! downsj     44: static char rcsid[] = "$OpenBSD$";
1.1       deraadt    45: #endif
                     46: #endif /* not lint */
                     47:
                     48: #include "ww.h"
                     49:
                     50: /*
                     51:  * Stick w1 behind w2.
                     52:  */
                     53: wwadd(w1, w2)
                     54: register struct ww *w1;
                     55: struct ww *w2;
                     56: {
                     57:        register i;
                     58:        register struct ww *w;
                     59:
                     60:        w1->ww_order = w2->ww_order + 1;
                     61:        w1->ww_back = w2;
                     62:        w1->ww_forw = w2->ww_forw;
                     63:        w2->ww_forw->ww_back = w1;
                     64:        w2->ww_forw = w1;
                     65:
                     66:        for (w = w1->ww_forw; w != &wwhead; w = w->ww_forw)
                     67:                w->ww_order++;
                     68:        for (i = w1->ww_i.t; i < w1->ww_i.b; i++) {
                     69:                register j;
1.2       niklas     70:                register unsigned char *smap = wwsmap[i];
1.1       deraadt    71:                register char *win = w1->ww_win[i];
                     72:                union ww_char *ns = wwns[i];
                     73:                union ww_char *buf = w1->ww_buf[i];
                     74:                int nvis = 0;
                     75:                int nchanged = 0;
                     76:
                     77:                for (j = w1->ww_i.l; j < w1->ww_i.r; j++) {
                     78:                        w = wwindex[smap[j]];
                     79:                        if (w1->ww_order > w->ww_order)
                     80:                                continue;
                     81:                        if (win[j] & WWM_GLS)
                     82:                                continue;
                     83:                        if (w != &wwnobody && w->ww_win[i][j] == 0)
                     84:                                w->ww_nvis[i]--;
                     85:                        smap[j] = w1->ww_index;
                     86:                        if (win[j] == 0)
                     87:                                nvis++;
                     88:                        ns[j].c_w = buf[j].c_w ^ win[j] << WWC_MSHIFT;
                     89:                        nchanged++;
                     90:                }
                     91:                if (nchanged > 0)
                     92:                        wwtouched[i] |= WWU_TOUCHED;
                     93:                w1->ww_nvis[i] = nvis;
                     94:        }
                     95: }