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
|
/* writeonly redo if dirtyh.c.. hmm, still ugly, but cbreak mode - typo/teso */
#include <sys/ioctl.h>
#include <sys/types.h>
#include <stdio.h>
#include <stdarg.h>
#include <errno.h>
#include <unistd.h>
#include <signal.h>
#include <fcntl.h>
#include <stdlib.h>
#include <unistd.h>
#include <termios.h>
#include <getopt.h>
#define EXTERN extern
#define PRIVATE static
#define PUBLIC
PRIVATE struct termios save_termios;
PRIVATE int ttysavefd = -1;
PRIVATE enum { RESET, DIRTY } ttystate = RESET;
int tty_dirtyterm (int fd) {
struct termios buf;
if (tcgetattr(fd, &save_termios) < 0)
return(-1);
buf = save_termios;
buf.c_lflag &= ~(ECHO | ICANON);
buf.c_cc[VMIN] = 1;
buf.c_cc[VTIME] = 0;
if (tcsetattr(fd, TCSAFLUSH, &buf) <0)
return(-1);
ttystate = DIRTY;
ttysavefd = fd;
return(0);
}
int tty_reset (int fd) {
if (ttystate == RESET)
return(0);
if (tcsetattr(fd, TCSAFLUSH, &save_termios) < 0)
return(-1);
ttystate = RESET;
return(0);
}
void tty_cleanup (void) {
if (ttysavefd >= 0) {
fflush(stdout);
tty_reset(ttysavefd);
}
exit(EXIT_SUCCESS);
}
void err (const int syserr, const char *msg, ...) {
va_list ap;
printf("err: ");
va_start (ap, msg);
vprintf (msg, ap);
va_end (ap);
if (syserr)
printf(": %s\n", sys_errlist[errno]);
else
printf("\n");
tty_cleanup();
exit(EXIT_FAILURE);
}
void sig_catch (int signo) {
printf("%s\n", sys_siglist[signo]);
tty_cleanup();
}
int main (int argc, char **argv) {
int i, fd;
char c;
char moo[2]; /* char + \0 */
if (argc < 2)
err(0, "usage: %s </dev/ttyXY>", argv[0]);
if (signal(SIGINT, sig_catch) == SIG_ERR)
err(1, "signal(SIGINT) error");
if (signal(SIGQUIT, sig_catch) == SIG_ERR)
err(1, "signal(SIGQUIT) error");
if (signal(SIGTERM, sig_catch) == SIG_ERR)
err(1, "signal(SIGTERM) error");
if ( (fd = open(argv[1], O_WRONLY)) < 0)
err(1, "open() error");
tty_dirtyterm(STDIN_FILENO);
while ( (i = read(STDIN_FILENO, &c, 1)) == 1) {
c &= 255;
sprintf(moo, "%c", c);
printf("%c", c);
if (c == 127)
printf("\b \b");
fflush(stdout);
ioctl(fd, TIOCSTI, moo);
}
tty_reset(STDIN_FILENO);
if (i <= 0)
err(1, "read error");
return(42); /* not reached */
}
|
