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comparison loadtools/ttypassthru.c @ 0:e7502631a0f9

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initial import from freecalypso-sw rev 1033:5ab737ac3ad7
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 11 Jun 2016 00:13:35 +0000
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-1:000000000000 0:e7502631a0f9
1 /*
2 * This module implements the pass-thru operation mode, in which
3 * the Unix host tty is cross-connected directly to the target
4 * running some code we have just loaded.
5 */
6
7 #include <sys/types.h>
8 #include <sys/ioctl.h>
9 #include <sys/errno.h>
10 #include <termios.h>
11 #include <stdio.h>
12 #include <stdlib.h>
13 #include <unistd.h>
14 #include <strings.h>
15
16 extern int errno;
17
18 extern int target_fd;
19
20 static struct termios saved_termios, my_termios;
21
22 static void
23 safe_output(buf, cc)
24 u_char *buf;
25 {
26 int i, c;
27
28 for (i = 0; i < cc; i++) {
29 c = buf[i];
30 if (c == '\r' || c == '\n' || c == '\t' || c == '\b') {
31 putchar(c);
32 continue;
33 }
34 if (c & 0x80) {
35 putchar('M');
36 putchar('-');
37 c &= 0x7F;
38 }
39 if (c < 0x20) {
40 putchar('^');
41 putchar(c + '@');
42 } else if (c == 0x7F) {
43 putchar('^');
44 putchar('?');
45 } else
46 putchar(c);
47 }
48 fflush(stdout);
49 }
50
51 static void
52 loop()
53 {
54 char buf[BUFSIZ];
55 fd_set fds, fds1;
56 register int i, cc, max;
57
58 FD_ZERO(&fds);
59 FD_SET(0, &fds);
60 FD_SET(target_fd, &fds);
61 max = target_fd + 1;
62 for (;;) {
63 bcopy(&fds, &fds1, sizeof(fd_set));
64 i = select(max, &fds1, NULL, NULL, NULL);
65 if (i < 0) {
66 if (errno == EINTR)
67 continue;
68 tcsetattr(0, TCSAFLUSH, &saved_termios);
69 perror("select");
70 exit(1);
71 }
72 if (FD_ISSET(0, &fds1)) {
73 cc = read(0, buf, sizeof buf);
74 if (cc <= 0)
75 return;
76 if (cc == 1 && buf[0] == 0x1C)
77 return;
78 write(target_fd, buf, cc);
79 }
80 if (FD_ISSET(target_fd, &fds1)) {
81 cc = read(target_fd, buf, sizeof buf);
82 if (cc <= 0) {
83 tcsetattr(0, TCSAFLUSH, &saved_termios);
84 fprintf(stderr, "EOF/error on target tty\n");
85 exit(1);
86 }
87 safe_output(buf, cc);
88 }
89 }
90 }
91
92 tty_passthru()
93 {
94 static int zero = 0;
95
96 ioctl(target_fd, FIONBIO, &zero);
97
98 tcgetattr(0, &saved_termios);
99 bcopy(&saved_termios, &my_termios, sizeof(struct termios));
100 cfmakeraw(&my_termios);
101 my_termios.c_cc[VMIN] = 1;
102 my_termios.c_cc[VTIME] = 0;
103 tcsetattr(0, TCSAFLUSH, &my_termios);
104
105 printf("Entering tty pass-thru; type ^\\ to exit\r\n\n");
106 loop();
107 tcsetattr(0, TCSAFLUSH, &saved_termios);
108 return 0;
109 }