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
|
/*
* POSIX terminal I/O.
*
* The functions in this file
* negotiate with the operating system for
* keyboard characters, and write characters to
* the display in a barely buffered fashion.
*/
#include "def.h"
#include <sys/types.h>
#include <sys/time.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <termios.h>
#include <term.h>
#define NOBUF 512 /* Output buffer size. */
char obuf[NOBUF]; /* Output buffer. */
int nobuf; /* buffer count */
static struct termios ot; /* entry state of the terminal */
static struct termios nt; /* editor's terminal state */
static int ttyactivep = FALSE; /* terminal in editor mode? */
static int ttysavedp = FALSE; /* terminal state saved? */
int nrow; /* Terminal size, rows. */
int ncol; /* Terminal size, columns. */
/*
* This function gets called once, to set up
* the terminal channel. This version turns off flow
* control. This may be wrong for your system, but no
* good solution has really been found (daveb).
*/
ttopen()
{
register char *cp;
if (ttyactivep)
return;
if( !ttysavedp )
{
if (tcgetattr(0, &ot) < 0)
abort();
nt = ot; /* save entry state */
/* Set terminal to 'raw' mode and ignore a 'break' */
nt.c_cc[VMIN] = 1;
nt.c_cc[VTIME] = 0;
nt.c_iflag |= IGNBRK;
nt.c_iflag &= ~(BRKINT|PARMRK|INLCR|IGNCR|ICRNL|IXON);
nt.c_oflag &= ~OPOST;
nt.c_lflag &= ~(ECHO|ECHONL|ICANON|ISIG|IEXTEN);
ttysavedp = TRUE;
}
if (tcsetattr(0, TCSASOFT | TCSADRAIN, &nt) < 0)
abort();
ttyactivep = TRUE;
}
/*
* This function gets called just
* before we go back home to the shell. Put all of
* the terminal parameters back.
*/
ttclose()
{
if(!ttysavedp || !ttyactivep)
return;
ttflush();
if (tcsetattr(0, TCSASOFT | TCSADRAIN, &ot) < 0)
abort();
ttyactivep = FALSE;
}
/*
* Write character to the display.
* Characters are buffered up, to make things
* a little bit more efficient.
*/
ttputc(c)
{
if (nobuf >= NOBUF)
ttflush();
obuf[nobuf++] = c;
}
/*
* Flush output.
*/
ttflush()
{
if (nobuf != 0) {
write(1, obuf, nobuf);
nobuf = 0;
}
}
/*
* Read character from terminal.
* All 8 bits are returned, so that you can use
* a multi-national terminal.
*
* If keyboard 'queue' already has typeahead from a typeahead() call,
* just return it. Otherwise, make sure we are in blocking i/o mode
* and read a character.
*/
ttgetc()
{
int c;
while (read(0, &c, 1) != 1)
;
return (c & 0xFF);
}
/*
* Return TRUE if there are characters waiting to be read.
*/
typeahead()
{
int x;
return((ioctl(0, FIONREAD, (char *) &x) < 0) ? 0 : x);
}
/*
* panic: print error and die, leaving core file.
* Don't know why this is needed (daveb).
*/
panic(s)
char *s;
{
(void) fputs("panic: ", stderr);
(void) fputs(s, stderr);
(void) fputc('\n', stderr);
abort(); /* To leave a core image. */
}
/*
** This should check the size of the window, and reset if needed.
*/
setttysize()
{
#ifdef TIOCGWINSZ
struct winsize winsize;
if (ioctl(0, TIOCGWINSZ, (char *) &winsize) == 0) {
nrow = winsize.ws_row;
ncol = winsize.ws_col;
} else
#endif
if ((nrow = lines) <= 0 || (ncol = columns) <= 0) {
nrow = 24;
ncol = 80;
}
/* Enforce maximum screen size. */
if (nrow > NROW)
nrow = NROW;
if (ncol > NCOL)
ncol = NCOL;
}
#ifndef NO_DPROMPT
/*
* Return TRUE if we wait without doing anything, else return FALSE.
*/
ttwait()
{
fd_set readfds;
struct timeval tmout;
FD_ZERO(&readfds);
FD_SET(0, &readfds);
tmout.tv_sec = 2;
tmout.tv_usec = 0;
if ((select(1, &readfds, NULL, NULL, &tmout)) == 0)
return(TRUE);
return(FALSE);
}
#endif NO_DPROMPT
|
