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Annotation of src/usr.bin/window/wwinschar.c, Revision 1.1.1.1

1.1       deraadt     1: /*     $NetBSD: wwinschar.c,v 1.3 1995/09/28 10:35:35 tls 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: #ifndef lint
                     40: #if 0
                     41: static char sccsid[] = "@(#)wwinschar.c        8.1 (Berkeley) 6/6/93";
                     42: #else
                     43: static char rcsid[] = "$NetBSD: wwinschar.c,v 1.3 1995/09/28 10:35:35 tls Exp $";
                     44: #endif
                     45: #endif /* not lint */
                     46:
                     47: #include "ww.h"
                     48: #include "tt.h"
                     49:
                     50: wwinschar(w, row, col, c, m)
                     51: register struct ww *w;
                     52: char c, m;
                     53: {
                     54:        register i;
                     55:        int nvis;
                     56:        short x = c | m << WWC_MSHIFT;
                     57:
                     58:        /*
                     59:         * First, shift the line.
                     60:         */
                     61:        {
                     62:                register union ww_char *p, *q;
                     63:
                     64:                p = &w->ww_buf[row][w->ww_b.r];
                     65:                q = p - 1;
                     66:                for (i = w->ww_b.r - col; --i > 0;)
                     67:                        *--p = *--q;
                     68:                q->c_w = x;
                     69:        }
                     70:
                     71:        /*
                     72:         * If can't see it, just return.
                     73:         */
                     74:        if (row < w->ww_i.t || row >= w->ww_i.b
                     75:            || w->ww_i.r <= 0 || w->ww_i.r <= col)
                     76:                return;
                     77:
                     78:        if (col < w->ww_i.l)
                     79:                col = w->ww_i.l;
                     80:
                     81:        /*
                     82:         * Now find out how much is actually changed, and fix wwns.
                     83:         */
                     84:        {
                     85:                register union ww_char *buf;
                     86:                register char *win;
                     87:                register union ww_char *ns;
                     88:                register char *smap;
                     89:                char touched;
                     90:
                     91:                nvis = 0;
                     92:                smap = &wwsmap[row][col];
                     93:                for (i = col; i < w->ww_i.r && *smap++ != w->ww_index; i++)
                     94:                        ;
                     95:                if (i >= w->ww_i.r)
                     96:                        return;
                     97:                col = i;
                     98:                buf = w->ww_buf[row];
                     99:                win = w->ww_win[row];
                    100:                ns = wwns[row];
                    101:                smap = &wwsmap[row][i];
                    102:                touched = wwtouched[row];
                    103:                for (; i < w->ww_i.r; i++) {
                    104:                        if (*smap++ != w->ww_index)
                    105:                                continue;
                    106:                        touched |= WWU_TOUCHED;
                    107:                        if (win[i])
                    108:                                ns[i].c_w =
                    109:                                        buf[i].c_w ^ win[i] << WWC_MSHIFT;
                    110:                        else {
                    111:                                nvis++;
                    112:                                ns[i] = buf[i];
                    113:                        }
                    114:                }
                    115:                wwtouched[row] = touched;
                    116:        }
                    117:
                    118:        /*
                    119:         * Can/Should we use delete character?
                    120:         */
                    121:        if ((tt.tt_inschar || tt.tt_insspace) && nvis > (wwncol - col) / 2) {
                    122:                register union ww_char *p, *q;
                    123:
                    124:                if (tt.tt_inschar)
                    125:                        xxinschar(row, col, c, m);
                    126:                else {
                    127:                        xxinsspace(row, col);
                    128:                        x = ' ';
                    129:                }
                    130:                p = &wwos[row][wwncol];
                    131:                q = p - 1;
                    132:                for (i = wwncol - col; --i > 0;)
                    133:                        *--p = *--q;
                    134:                q->c_w = x;
                    135:        }
                    136: }