mirror of
https://github.com/tio/tio.git
synced 2026-05-01 14:57:59 +02:00
05b6a554d3
In 72a287f189 the escape key was changed from ^g to ^t, but some
code and comments still referred to the old key.
249 lines
6.7 KiB
C
249 lines
6.7 KiB
C
/*
|
|
* tio - the simple TTY terminal I/O application
|
|
*
|
|
* Copyright (c) 2014-2016 Martin Lund
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version 2
|
|
* of the License, or (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
|
|
* 02110-1301, USA.
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <unistd.h>
|
|
#include <string.h>
|
|
#include <stdlib.h>
|
|
#include <limits.h>
|
|
#include <sys/types.h>
|
|
#include <sys/stat.h>
|
|
#include <sys/param.h>
|
|
#include <fcntl.h>
|
|
#include <termios.h>
|
|
#include <stdbool.h>
|
|
#include <errno.h>
|
|
#include "tio/tty.h"
|
|
#include "tio/print.h"
|
|
#include "tio/options.h"
|
|
#include "tio/time.h"
|
|
#include "tio/log.h"
|
|
|
|
static int connected = false;
|
|
struct termios new_stdout, old_stdout, old_tio;
|
|
static int fd;
|
|
static bool tainted = false;
|
|
|
|
void wait_for_tty_device(void)
|
|
{
|
|
int ready, n;
|
|
struct stat status;
|
|
fd_set rdfs;
|
|
struct timeval tv;
|
|
char c_stdin[3];
|
|
|
|
/* Loop until device pops up */
|
|
while (true)
|
|
{
|
|
/* Test for accessible device file */
|
|
if (access(option.tty_device, R_OK) == 0)
|
|
return;
|
|
|
|
/* Wait up to 1 second */
|
|
tv.tv_sec = 1;
|
|
tv.tv_usec = 0;
|
|
|
|
FD_ZERO(&rdfs);
|
|
FD_SET(STDIN_FILENO, &rdfs);
|
|
|
|
/* Block until input becomes available or timeout */
|
|
ready = select(STDIN_FILENO + 1, &rdfs, NULL, NULL, &tv);
|
|
if (ready)
|
|
{
|
|
/* Input from stdin ready */
|
|
|
|
/* Read one character */
|
|
n = read(STDIN_FILENO, &c_stdin[0], 1);
|
|
|
|
/* Exit upon ctrl-t + q sequence */
|
|
c_stdin[2] = c_stdin[1];
|
|
c_stdin[1] = c_stdin[0];
|
|
if ((c_stdin[1] == KEY_Q) && (c_stdin[2] == KEY_CTRL_T))
|
|
exit(EXIT_SUCCESS);
|
|
}
|
|
}
|
|
}
|
|
|
|
void configure_stdout(void)
|
|
{
|
|
/* Save current stdout settings */
|
|
if (tcgetattr(STDOUT_FILENO, &old_stdout) < 0)
|
|
{
|
|
printf("Error: Saving current stdio settings failed\n");
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
|
|
/* Prepare new stdout settings */
|
|
bzero(&new_stdout, sizeof(new_stdout));
|
|
|
|
/* Control, input, output, local modes for stdout */
|
|
new_stdout.c_cflag = 0;
|
|
new_stdout.c_iflag = 0;
|
|
new_stdout.c_oflag = 0;
|
|
new_stdout.c_lflag = 0;
|
|
|
|
/* Control characters */
|
|
new_stdout.c_cc[VTIME] = 0; /* Inter-character timer unused */
|
|
new_stdout.c_cc[VMIN] = 1; /* Blocking read until 1 character received */
|
|
|
|
/* Activate new stdout settings */
|
|
tcsetattr(STDOUT_FILENO, TCSANOW, &new_stdout);
|
|
tcsetattr(STDOUT_FILENO, TCSAFLUSH, &new_stdout);
|
|
}
|
|
|
|
void restore_stdout(void)
|
|
{
|
|
tcflush(STDOUT_FILENO, TCIOFLUSH);
|
|
tcsetattr(STDOUT_FILENO, TCSANOW, &old_stdout);
|
|
tcsetattr(STDOUT_FILENO, TCSAFLUSH, &old_stdout);
|
|
}
|
|
|
|
void disconnect_tty(void)
|
|
{
|
|
if (tainted)
|
|
putchar('\n');
|
|
color_printf("[tio %s] Disconnected", current_time());
|
|
close(fd);
|
|
connected = false;
|
|
}
|
|
|
|
void restore_tty(void)
|
|
{
|
|
tcsetattr(fd, TCSANOW, &old_tio);
|
|
tcsetattr(fd, TCSAFLUSH, &old_tio);
|
|
|
|
if (connected)
|
|
disconnect_tty();
|
|
}
|
|
|
|
int connect_tty(void)
|
|
{
|
|
fd_set rdfs; /* Read file descriptor set */
|
|
int maxfd; /* Maximum file descriptor used */
|
|
static bool first = true;
|
|
int status;
|
|
char c_tty;
|
|
char c_stdin[3];
|
|
|
|
/* Open tty device */
|
|
fd = open(option.tty_device, O_RDWR | O_NOCTTY );
|
|
if (fd < 0)
|
|
return EXIT_FAILURE;
|
|
|
|
/* Make sure device is of tty type */
|
|
if (!isatty(fd))
|
|
return EXIT_FAILURE;
|
|
|
|
/* Flush stale I/O data (if any) */
|
|
tcflush(fd, TCIOFLUSH);
|
|
|
|
/* Print connect status */
|
|
color_printf("[tio %s] Connected", current_time());
|
|
connected = true;
|
|
tainted = false;
|
|
bzero(&c_stdin[0], 3);
|
|
c_tty = 0;
|
|
|
|
/* Save current port settings */
|
|
if (tcgetattr(fd, &old_tio) < 0)
|
|
return EXIT_FAILURE;
|
|
|
|
/* Make sure we restore tty settings on exit */
|
|
if (first)
|
|
{
|
|
atexit(&restore_tty);
|
|
first = false;
|
|
}
|
|
|
|
/* Control, input, output, local modes for tty device */
|
|
option.tio.c_cflag |= CLOCAL | CREAD;
|
|
option.tio.c_oflag = 0;
|
|
option.tio.c_lflag = 0;
|
|
|
|
/* Control characters */
|
|
option.tio.c_cc[VTIME] = 0; /* Inter-character timer unused */
|
|
option.tio.c_cc[VMIN] = 1; /* Blocking read until 1 character received */
|
|
|
|
/* Activate new port settings */
|
|
tcsetattr(fd, TCSANOW, &option.tio);
|
|
tcsetattr(fd, TCSAFLUSH, &option.tio);
|
|
|
|
maxfd = MAX(fd, STDIN_FILENO) + 1; /* Maximum bit entry (fd) to test */
|
|
|
|
/* Input loop */
|
|
while (true)
|
|
{
|
|
FD_ZERO(&rdfs);
|
|
FD_SET(fd, &rdfs);
|
|
FD_SET(STDIN_FILENO, &rdfs);
|
|
|
|
/* Block until input becomes available */
|
|
select(maxfd, &rdfs, NULL, NULL, NULL);
|
|
if (FD_ISSET(fd, &rdfs))
|
|
{
|
|
/* Input from tty device ready */
|
|
if (read(fd, &c_tty, 1) > 0)
|
|
{
|
|
/* Print received tty character to stdout */
|
|
putchar(c_tty);
|
|
fflush(stdout);
|
|
|
|
/* Write to log */
|
|
if (option.log)
|
|
log_write(c_tty);
|
|
|
|
if (c_tty != KEY_CTRL_T) // Small trick to avoid ctrl-t echo
|
|
tainted = true;
|
|
} else
|
|
{
|
|
/* Error reading - device is likely unplugged */
|
|
disconnect_tty();
|
|
return EXIT_FAILURE;
|
|
}
|
|
}
|
|
if (FD_ISSET(STDIN_FILENO, &rdfs))
|
|
{
|
|
/* Input from stdin ready */
|
|
status = read(STDIN_FILENO, &c_stdin[0], 1);
|
|
if ((c_stdin[0] != KEY_Q) && (c_stdin[0] != KEY_CTRL_T))
|
|
tainted = true;
|
|
|
|
/* Exit upon ctrl-t + q sequence */
|
|
c_stdin[2] = c_stdin[1];
|
|
c_stdin[1] = c_stdin[0];
|
|
if ((c_stdin[1] == KEY_Q) && (c_stdin[2] == KEY_CTRL_T))
|
|
exit(EXIT_SUCCESS);
|
|
|
|
/* Forward input to tty device */
|
|
status = write(fd, &c_stdin[0], 1);
|
|
|
|
/* Write to log */
|
|
if (option.log)
|
|
log_write(c_stdin[0]);
|
|
|
|
/* Insert output delay */
|
|
if (option.output_delay)
|
|
usleep(option.output_delay * 1000);
|
|
}
|
|
}
|
|
|
|
return EXIT_SUCCESS;
|
|
}
|