1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
|
/*
* Copyright (c) 1989, 1993
* The 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[] = "@(#)xxflush.c 8.1 (Berkeley) 6/6/93";
static char rcsid[] =
"$FreeBSD$";
#endif /* not lint */
#include "ww.h"
#include "xx.h"
#include "tt.h"
xxflush(intr)
register intr;
{
register struct xx *xp, *xq;
for (xp = xx_head; xp != 0 && !(intr && wwinterrupt()); xp = xq) {
switch (xp->cmd) {
case xc_move:
if (xp->link == 0)
(*tt.tt_move)(xp->arg0, xp->arg1);
break;
case xc_scroll:
xxflush_scroll(xp);
break;
case xc_inschar:
(*tt.tt_move)(xp->arg0, xp->arg1);
tt.tt_nmodes = xp->arg3;
(*tt.tt_inschar)(xp->arg2);
break;
case xc_insspace:
(*tt.tt_move)(xp->arg0, xp->arg1);
(*tt.tt_insspace)(xp->arg2);
break;
case xc_delchar:
(*tt.tt_move)(xp->arg0, xp->arg1);
(*tt.tt_delchar)(xp->arg2);
break;
case xc_clear:
(*tt.tt_clear)();
break;
case xc_clreos:
(*tt.tt_move)(xp->arg0, xp->arg1);
(*tt.tt_clreos)();
break;
case xc_clreol:
(*tt.tt_move)(xp->arg0, xp->arg1);
(*tt.tt_clreol)();
break;
case xc_write:
(*tt.tt_move)(xp->arg0, xp->arg1);
tt.tt_nmodes = xp->arg3;
(*tt.tt_write)(xp->buf, xp->arg2);
break;
}
xq = xp->link;
xxfree(xp);
}
if ((xx_head = xp) == 0) {
xx_tail = 0;
xxbufp = xxbuf;
}
ttflush();
}
xxflush_scroll(xp)
register struct xx *xp;
{
register struct xx *xq;
top:
if (xp->arg0 == 0)
return;
/*
* We handle retain (da and db) by putting the burden on scrolling up,
* which is the less common operation. It must ensure that
* text is not pushed below the screen, so scrolling down doesn't
* have to worry about it.
*
* Try scrolling region (or scrolling the whole screen) first.
* Can we assume "sr" doesn't push text below the screen
* so we don't have to worry about retain below?
* What about scrolling down with a newline? It probably does
* push text above (with da). Scrolling up would then have
* to take care of that.
* It's easy to be fool proof, but that slows things down.
* The current solution is to disallow tt_scroll_up if da or db is true
* but cs (scrolling region) is not. Again, we sacrifice scrolling
* up in favor of scrolling down. The idea is having scrolling regions
* probably means we can scroll (even the whole screen) with impunity.
* This lets us work efficiently on simple terminals (use newline
* on the bottom to scroll), on any terminal without retain, and
* on vt100 style scrolling regions (I think).
*/
if (xp->arg0 > 0) {
if ((xq = xp->link) != 0 && xq->cmd == xc_scroll &&
xp->arg2 == xq->arg2 && xq->arg0 < 0) {
if (xp->arg1 < xq->arg1) {
if (xp->arg2 - xp->arg0 <= xq->arg1) {
xq->arg0 = xp->arg0;
xq->arg1 = xp->arg1;
xq->arg2 = xp->arg2;
return;
}
xp->arg2 = xq->arg1 + xp->arg0;
xq->arg0 += xp->arg0;
xq->arg1 = xp->arg2;
if (xq->arg0 > 0)
xq->arg1 -= xq->arg0;
goto top;
} else {
if (xp->arg1 - xq->arg0 >= xp->arg2)
return;
xq->arg2 = xp->arg1 - xq->arg0;
xp->arg0 += xq->arg0;
xp->arg1 = xq->arg2;
if (xp->arg0 < 0)
xp->arg1 += xp->arg0;
goto top;
}
}
if (xp->arg0 > xp->arg2 - xp->arg1)
xp->arg0 = xp->arg2 - xp->arg1;
if (tt.tt_scroll_down) {
if (tt.tt_scroll_top != xp->arg1 ||
tt.tt_scroll_bot != xp->arg2 - 1) {
if (tt.tt_setscroll == 0)
goto down;
(*tt.tt_setscroll)(xp->arg1, xp->arg2 - 1);
}
tt.tt_scroll_down(xp->arg0);
} else {
down:
(*tt.tt_move)(xp->arg1, 0);
(*tt.tt_delline)(xp->arg0);
if (xp->arg2 < tt.tt_nrow) {
(*tt.tt_move)(xp->arg2 - xp->arg0, 0);
(*tt.tt_insline)(xp->arg0);
}
}
} else {
xp->arg0 = - xp->arg0;
if (xp->arg0 > xp->arg2 - xp->arg1)
xp->arg0 = xp->arg2 - xp->arg1;
if (tt.tt_scroll_up) {
if (tt.tt_scroll_top != xp->arg1 ||
tt.tt_scroll_bot != xp->arg2 - 1) {
if (tt.tt_setscroll == 0)
goto up;
(*tt.tt_setscroll)(xp->arg1, xp->arg2 - 1);
}
tt.tt_scroll_up(xp->arg0);
} else {
up:
if (tt.tt_retain || xp->arg2 != tt.tt_nrow) {
(*tt.tt_move)(xp->arg2 - xp->arg0, 0);
(*tt.tt_delline)(xp->arg0);
}
(*tt.tt_move)(xp->arg1, 0);
(*tt.tt_insline)(xp->arg0);
}
}
}
|
