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
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
|
/* $OpenBSD: screen.c,v 1.20 2010/02/05 10:21:10 otto Exp $ */
/*
* Top users/processes display for Unix
* Version 3
*
* Copyright (c) 1984, 1989, William LeFebvre, Rice University
* Copyright (c) 1989, 1990, 1992, William LeFebvre, Northwestern University
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR OR HIS EMPLOYER 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.
*/
/*
* This file contains the routines that interface to termcap and stty/gtty.
*
* Paul Vixie, February 1987: converted to use ioctl() instead of stty/gtty.
*
* I put in code to turn on the TOSTOP bit while top was running, but I didn't
* really like the results. If you desire it, turn on the preprocessor
* variable "TOStop". --wnl
*/
#include <sys/types.h>
#include <sys/ioctl.h>
#include <curses.h>
#include <err.h>
#include <stdio.h>
#include <stdlib.h>
#include <term.h>
#include <unistd.h>
#include "top.h"
#include "screen.h"
#include "layout.h"
#include "boolean.h"
int screen_length, screen_width;
char ch_erase, ch_kill, smart_terminal;
static struct termios old_settings, new_settings;
static char is_a_terminal = No;
void
init_termcap(int interactive)
{
char *term_name;
int status;
/* set defaults in case we aren't smart */
screen_width = MAX_COLS;
screen_length = 0;
if (!interactive) {
/* pretend we have a dumb terminal */
smart_terminal = No;
return;
}
/* assume we have a smart terminal until proven otherwise */
smart_terminal = Yes;
/* get the terminal name */
term_name = getenv("TERM");
/* if there is no TERM, assume it's a dumb terminal */
/* patch courtesy of Sam Horrocks at telegraph.ics.uci.edu */
if (term_name == NULL) {
smart_terminal = No;
return;
}
/* now get the termcap entry */
if ((status = tgetent(NULL, term_name)) != 1) {
if (status == -1)
warnx("can't open termcap file");
else
warnx("no termcap entry for a `%s' terminal", term_name);
/* pretend it's dumb and proceed */
smart_terminal = No;
return;
}
/* "hardcopy" immediately indicates a very stupid terminal */
if (tgetflag("hc")) {
smart_terminal = No;
return;
}
/* set up common terminal capabilities */
if ((screen_length = tgetnum("li")) <= y_procs) {
screen_length = smart_terminal = 0;
return;
}
/* screen_width is a little different */
if ((screen_width = tgetnum("co")) == -1)
screen_width = 79;
else
screen_width -= 1;
/* get necessary capabilities */
if (tgetstr("cl", NULL) == NULL || tgetstr("cm", NULL) == NULL) {
smart_terminal = No;
return;
}
/* get the actual screen size with an ioctl, if needed */
/*
* This may change screen_width and screen_length, and it always sets
* lower_left.
*/
get_screensize();
/* if stdout is not a terminal, pretend we are a dumb terminal */
if (tcgetattr(STDOUT_FILENO, &old_settings) == -1)
smart_terminal = No;
}
void
init_screen(void)
{
/* get the old settings for safe keeping */
if (tcgetattr(STDOUT_FILENO, &old_settings) != -1) {
/* copy the settings so we can modify them */
new_settings = old_settings;
/* turn off ICANON, character echo and tab expansion */
new_settings.c_lflag &= ~(ICANON | ECHO);
new_settings.c_oflag &= ~(OXTABS);
new_settings.c_cc[VMIN] = 1;
new_settings.c_cc[VTIME] = 0;
(void) tcsetattr(STDOUT_FILENO, TCSADRAIN, &new_settings);
/* remember the erase and kill characters */
ch_erase = old_settings.c_cc[VERASE];
ch_kill = old_settings.c_cc[VKILL];
is_a_terminal = Yes;
#if 0
/* send the termcap initialization string */
putcap(terminal_init);
#endif
}
if (!is_a_terminal) {
/* not a terminal at all---consider it dumb */
smart_terminal = No;
}
if (smart_terminal)
initscr();
}
void
end_screen(void)
{
if (smart_terminal) {
move(screen_length-1, 0);
clrtoeol();
refresh();
endwin();
}
if (is_a_terminal)
(void) tcsetattr(STDOUT_FILENO, TCSADRAIN, &old_settings);
}
void
reinit_screen(void)
{
#if 0
/* install our settings if it is a terminal */
if (is_a_terminal)
(void) tcsetattr(STDOUT_FILENO, TCSADRAIN, &new_settings);
/* send init string */
if (smart_terminal)
putcap(terminal_init);
#endif
}
void
get_screensize(void)
{
struct winsize ws;
if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) != -1) {
if (ws.ws_row != 0)
screen_length = ws.ws_row;
if (ws.ws_col != 0)
screen_width = ws.ws_col - 1;
}
}
void
go_home(void)
{
if (smart_terminal) {
move(0, 0);
refresh();
}
}
|
