FreeCalypso > hg > freecalypso-tools
view loadtools/ttypassthru.c @ 921:74d284add54d
fc-fsio: guard against bogus readdir results from the target
If the FFS being operated on contains SE K2x0 extended filenames,
readdir will return strings that are bad for printing. We need to
guard against this possibility, and also against possible other
bogosity that could be sent by other alien firmwares.
author | Mychaela Falconia <falcon@freecalypso.org> |
---|---|
date | Sat, 31 Dec 2022 22:55:23 +0000 |
parents | e7502631a0f9 |
children |
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/* * This module implements the pass-thru operation mode, in which * the Unix host tty is cross-connected directly to the target * running some code we have just loaded. */ #include <sys/types.h> #include <sys/ioctl.h> #include <sys/errno.h> #include <termios.h> #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <strings.h> extern int errno; extern int target_fd; static struct termios saved_termios, my_termios; static void safe_output(buf, cc) u_char *buf; { int i, c; for (i = 0; i < cc; i++) { c = buf[i]; if (c == '\r' || c == '\n' || c == '\t' || c == '\b') { putchar(c); continue; } if (c & 0x80) { putchar('M'); putchar('-'); c &= 0x7F; } if (c < 0x20) { putchar('^'); putchar(c + '@'); } else if (c == 0x7F) { putchar('^'); putchar('?'); } else putchar(c); } fflush(stdout); } static void loop() { char buf[BUFSIZ]; fd_set fds, fds1; register int i, cc, max; FD_ZERO(&fds); FD_SET(0, &fds); FD_SET(target_fd, &fds); max = target_fd + 1; for (;;) { bcopy(&fds, &fds1, sizeof(fd_set)); i = select(max, &fds1, NULL, NULL, NULL); if (i < 0) { if (errno == EINTR) continue; tcsetattr(0, TCSAFLUSH, &saved_termios); perror("select"); exit(1); } if (FD_ISSET(0, &fds1)) { cc = read(0, buf, sizeof buf); if (cc <= 0) return; if (cc == 1 && buf[0] == 0x1C) return; write(target_fd, buf, cc); } if (FD_ISSET(target_fd, &fds1)) { cc = read(target_fd, buf, sizeof buf); if (cc <= 0) { tcsetattr(0, TCSAFLUSH, &saved_termios); fprintf(stderr, "EOF/error on target tty\n"); exit(1); } safe_output(buf, cc); } } } tty_passthru() { static int zero = 0; ioctl(target_fd, FIONBIO, &zero); tcgetattr(0, &saved_termios); bcopy(&saved_termios, &my_termios, sizeof(struct termios)); cfmakeraw(&my_termios); my_termios.c_cc[VMIN] = 1; my_termios.c_cc[VTIME] = 0; tcsetattr(0, TCSAFLUSH, &my_termios); printf("Entering tty pass-thru; type ^\\ to exit\r\n\n"); loop(); tcsetattr(0, TCSAFLUSH, &saved_termios); return 0; }