1 /* @(#)wwinschar.c 8.1 (Berkeley) 6/6/93 */
2 /* $NetBSD: wwinschar.c,v 1.7 2003/08/07 11:17:40 agc Exp $ */
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. Neither the name of the University nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35
36 #include "ww.h"
37 #include "tt.h"
38 #include "xx.h"
39
40 void
wwinschar(struct ww * w,int row,int col,char c,char m)41 wwinschar(struct ww *w, int row, int col, char c, char m)
42 {
43 int i;
44 int nvis;
45 short x = c | m << WWC_MSHIFT;
46
47 /*
48 * First, shift the line.
49 */
50 {
51 union ww_char *p, *q;
52
53 p = &w->ww_buf[row][w->ww_b.r];
54 q = p - 1;
55 for (i = w->ww_b.r - col; --i > 0;)
56 *--p = *--q;
57 q->c_w = x;
58 }
59
60 /*
61 * If can't see it, just return.
62 */
63 if (row < w->ww_i.t || row >= w->ww_i.b
64 || w->ww_i.r <= 0 || w->ww_i.r <= col)
65 return;
66
67 if (col < w->ww_i.l)
68 col = w->ww_i.l;
69
70 /*
71 * Now find out how much is actually changed, and fix wwns.
72 */
73 {
74 union ww_char *buf;
75 char *win;
76 union ww_char *ns;
77 unsigned char *smap;
78 char touched;
79
80 nvis = 0;
81 smap = &wwsmap[row][col];
82 for (i = col; i < w->ww_i.r && *smap++ != w->ww_index; i++)
83 ;
84 if (i >= w->ww_i.r)
85 return;
86 col = i;
87 buf = w->ww_buf[row];
88 win = w->ww_win[row];
89 ns = wwns[row];
90 smap = &wwsmap[row][i];
91 touched = wwtouched[row];
92 for (; i < w->ww_i.r; i++) {
93 if (*smap++ != w->ww_index)
94 continue;
95 touched |= WWU_TOUCHED;
96 if (win[i])
97 ns[i].c_w =
98 buf[i].c_w ^ win[i] << WWC_MSHIFT;
99 else {
100 nvis++;
101 ns[i] = buf[i];
102 }
103 }
104 wwtouched[row] = touched;
105 }
106
107 /*
108 * Can/Should we use delete character?
109 */
110 if ((tt.tt_inschar || tt.tt_insspace) && nvis > (wwncol - col) / 2) {
111 union ww_char *p, *q;
112
113 if (tt.tt_inschar)
114 xxinschar(row, col, c, m);
115 else {
116 xxinsspace(row, col);
117 x = ' ';
118 }
119 p = &wwos[row][wwncol];
120 q = p - 1;
121 for (i = wwncol - col; --i > 0;)
122 *--p = *--q;
123 q->c_w = x;
124 }
125 }
126