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Martin Lund 2014-09-27 11:35:17 +02:00
commit a14d14d75b
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2
src/Makefile.am Normal file
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bin_PROGRAMS = gotty
gotty_SOURCES = tty.c options.c device.c main.c

38
src/device.c Normal file
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/*
* Go TTY - The Really Simple Terminal Application
*
* Copyright (c) 2014 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 <sys/stat.h>
#include "gotty/options.h"
void wait_for_device(void)
{
struct stat status;
/* Loop until device pops up */
while (true)
{
sleep(1);
if (stat(option.device, &status) == 0)
return;
}
}

27
src/include/gotty/device.h Normal file
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/*
* Go TTY - The Really Simple Terminal Application
*
* Copyright (c) 2014 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.
*/
#ifndef DEVICE_H
#define DEVICE_H
void wait_for_device(void);
#endif

41
src/include/gotty/options.h Normal file
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/*
* Go TTY - The Really Simple Terminal Application
*
* Copyright (c) 2014 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.
*/
#ifndef OPTIONS_H
#define OPTIONS_H
#include <stdbool.h>
#include <limits.h>
#include <termios.h>
/* Options */
struct option_t
{
char device[256];
bool no_autoconnect;
struct termios tio;
};
extern struct option_t option;
void parse_options(int argc, char *argv[]);
#endif

49
src/include/gotty/print.h Normal file
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/*
* Go TTY - The Really Simple Terminal Application
*
* Copyright (c) 2014 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.
*/
#ifndef PRINT_H
#define PRINT_H
#define ANSI_COLOR_GRAY "\x1b[1;30m"
#define ANSI_COLOR_RED "\x1b[1;31m"
#define ANSI_COLOR_GREEN "\x1b[1;32m"
#define ANSI_COLOR_YELLOW "\x1b[1;33m"
#define ANSI_COLOR_BLUE "\x1b[1;34m"
#define ANSI_COLOR_PINK "\x1b[1;35m"
#define ANSI_COLOR_CYAN "\x1b[1;36m"
#define ANSI_COLOR_WHITE "\x1b[1;37m"
#define ANSI_COLOR_RESET "\x1b[0m"
#define gotty_printf(format, args...) \
fprintf (stdout, "\n\033[300D" ANSI_COLOR_YELLOW "[gotty] " format ANSI_COLOR_RESET "\033[300D\n", ## args); \
fflush(stdout);
#ifdef DEBUG
#define debug_printf(format, args...) \
fprintf (stdout, "[debug] " format, ## args)
#define debug_printf_raw(format, args...) \
fprintf (stdout, "" format, ## args)
#else
#define debug_printf(format, args...)
#define debug_printf_raw(format, args...)
#endif
#endif

28
src/include/gotty/tty.h Normal file
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/*
* Go TTY - The Really Simple Terminal Application
*
* Copyright (c) 2014 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.
*/
#ifndef TTY_H
#define TTY_H
void configure_stdout(void);
int connect_tty(void);
#endif

50
src/main.c Normal file
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/*
* Go TTY - The Really Simple Terminal Application
*
* Copyright (c) 2014 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 "gotty/options.h"
#include "gotty/tty.h"
#include "gotty/device.h"
int main(int argc, char *argv[])
{
int status;
/* Parse options */
parse_options(argc, argv);
/* Configure output terminal */
configure_stdout();
/* Connect to tty device */
if (option.no_autoconnect)
status = connect_tty();
else
{
while (true)
{
wait_for_device();
status = connect_tty();
}
}
return status;
}

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src/options.c Normal file
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/*
* Go TTY - The Really Simple Terminal Application
*
* Copyright (c) 2014 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 <sys/types.h>
#include <sys/stat.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <getopt.h>
#include <termios.h>
#include "config.h"
#include "gotty/options.h"
#include "gotty/print.h"
struct option_t option =
{
"", /* Device name */
false, /* No autoconnect */
};
void print_options_help(char *argv[])
{
printf("Usage: %s [<options>] <device>\n", argv[0]);
printf("\n");
printf("Options:\n");
printf(" -b, --baudrate <baudrate> Baud rate (default: 115200)\n");
printf(" -d, --databits 5|6|7|8 Data bits (default: 8)\n");
printf(" -f, --flow hard|soft|none Flow control (default: none)\n");
printf(" -s, --stopbits 1|2 Stop bits (default: 1)\n");
printf(" -p, --parity even|odd|none Parity (default: none)\n");
printf(" -n, --no-autoconnect Disable automatic connect\n");
printf(" -v, --version Display version\n");
printf(" -h, --help Display help\n");
printf("\n");
printf("In session, press ctrl-g + ctrl-q to quit.\n");
printf("\n");
}
void parse_options(int argc, char *argv[])
{
int c;
int baudrate;
int databits;
int stopbits;
if (argc == 1)
{
print_options_help(argv);
exit(0);
}
/* Set default termios settings:
* (115200 baud, 8 data bits, no flow control, 1 stop bit, no parity) */
bzero(&option.tio, sizeof(option.tio));
option.tio.c_cflag = B115200 | CS8;
while (1)
{
static struct option long_options[] =
{
{"baudrate", required_argument, 0, 'b'},
{"databits", required_argument, 0, 'd'},
{"flow", required_argument, 0, 'f'},
{"stopbits", required_argument, 0, 's'},
{"parity", required_argument, 0, 'p'},
{"no-autoconnect", no_argument, 0, 'n'},
{"version", no_argument, 0, 'v'},
{"help", no_argument, 0, 'h'},
{0, 0, 0, 0 }
};
/* getopt_long stores the option index here */
int option_index = 0;
/* Parse argument using getopt_long */
c = getopt_long(argc, argv, "b:d:f:s:p:nvh", long_options, &option_index);
/* Detect the end of the options */
if (c == -1)
break;
switch (c)
{
case 0:
/* If this option sets a flag, do nothing else now */
if (long_options[option_index].flag != 0)
break;
printf("option %s", long_options[option_index].name);
if (optarg)
printf(" with arg %s", optarg);
printf("\n");
break;
case 'b':
baudrate = atoi(optarg);
switch (baudrate)
{
case 0:
baudrate = B0;
break;
case 50:
baudrate = B50;
break;
case 75:
baudrate = B75;
break;
case 110:
baudrate = B110;
break;
case 134:
baudrate = B134;
break;
case 150:
baudrate = B150;
break;
case 300:
baudrate = B300;
break;
case 600:
baudrate = B600;
break;
case 1200:
baudrate = B1200;
break;
case 2400:
baudrate = B2400;
break;
case 4800:
baudrate = B4800;
break;
case 9600:
baudrate = B9600;
break;
case 19200:
baudrate = B19200;
break;
case 38400:
baudrate = B38400;
break;
case 57600:
baudrate = B57600;
break;
case 115200:
baudrate = B115200;
break;
case 230400:
baudrate = B230400;
break;
case 460800:
baudrate = B460800;
break;
case 500000:
baudrate = B500000;
break;
case 576000:
baudrate = B576000;
break;
case 921600:
baudrate = B921600;
break;
case 1000000:
baudrate = B1000000;
break;
case 1152000:
baudrate = B1152000;
break;
case 1500000:
baudrate = B1500000;
break;
case 2000000:
baudrate = B2000000;
break;
case 2500000:
baudrate = B2500000;
break;
case 3000000:
baudrate = B3000000;
break;
case 3500000:
baudrate = B3500000;
break;
case 4000000:
baudrate = B4000000;
break;
default:
printf("Error: Invalid baud rate.\n");
exit(EXIT_FAILURE);
}
cfsetispeed(&option.tio, baudrate);
cfsetospeed(&option.tio, baudrate);
break;
case 'd':
databits = atoi(optarg);
option.tio.c_cflag &= ~CSIZE;
switch (databits)
{
case 5:
option.tio.c_cflag |= CS5;
break;
case 6:
option.tio.c_cflag |= CS6;
break;
case 7:
option.tio.c_cflag |= CS7;
break;
case 8:
option.tio.c_cflag |= CS8;
break;
default:
printf("Error: Invalid data bits.\n");
exit(EXIT_FAILURE);
}
break;
case 'f':
if (strcmp("hard", optarg) == 0)
{
option.tio.c_cflag |= CRTSCTS;
option.tio.c_iflag &= ~(IXON | IXOFF | IXANY);
}
else if (strcmp("soft", optarg) == 0)
{
option.tio.c_cflag &= ~CRTSCTS;
option.tio.c_iflag |= IXON | IXOFF;
}
else if (strcmp("none", optarg) == 0)
{
option.tio.c_cflag &= ~CRTSCTS;
option.tio.c_iflag &= ~(IXON | IXOFF | IXANY);
}
else
{
printf("Error: Invalid flow control.\n");
exit(EXIT_FAILURE);
}
break;
case 's':
stopbits = atoi(optarg);
switch (stopbits)
{
case 1:
option.tio.c_cflag &= ~CSTOPB;
break;
case 2:
option.tio.c_cflag |= CSTOPB;
break;
default:
printf("Error: Invalid stop bits.\n");
exit(EXIT_FAILURE);
}
break;
case 'p':
if (strcmp("odd", optarg) == 0)
{
option.tio.c_cflag |= PARENB;
option.tio.c_cflag |= PARODD;
}
else if (strcmp("even", optarg) == 0)
{
option.tio.c_cflag |= PARENB;
option.tio.c_cflag &= ~PARODD;
}
else if (strcmp("none", optarg) == 0)
option.tio.c_cflag &= ~PARENB;
else
{
printf("Error: Invalid parity.\n");
exit(EXIT_FAILURE);
}
break;
case 'n':
option.no_autoconnect = true;
break;
case 'v':
printf("Go TTY v%s\n", VERSION);
printf("Copyright (c) 2014 Martin Lund\n");
printf("\n");
printf("License GPLv2: GNU GPL version 2 or later <http://gnu.org/licenses/gpl-2.0.html>.\n");
printf("This is free software: you are free to change and redistribute it.\n");
printf("There is NO WARRANTY, to the extent permitted by law.\n");
exit(0);
break;
case 'h':
print_options_help(argv);
exit(0);
break;
case '?':
/* getopt_long already printed an error message */
exit(1);
break;
default:
exit(1);
}
}
/* Assume first non-option is the tty device name */
if (optind < argc)
strcpy(option.device, argv[optind++]);
if (strlen(option.device) == 0)
{
printf("Error: Missing device name.\n");
exit(EXIT_FAILURE);
}
/* Print any remaining command line arguments (unknown options) */
if (optind < argc)
{
printf("%s: unknown arguments: ", argv[0]);
while (optind < argc)
printf("%s ", argv[optind++]);
printf("\n");
exit(EXIT_FAILURE);
}
}

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/*
* Go TTY - The Really Simple Terminal Application
*
* Copyright (c) 2014 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 <fcntl.h>
#include <termios.h>
#include <stdbool.h>
#include "gotty/tty.h"
#include "gotty/print.h"
#include "gotty/options.h"
#define MAX(x, y) (((x) > (y)) ? (x) : (y))
#define CTRLG 0x07
#define CTRLQ 0x11
static int fd;
struct termios stdio, old_stdio, old_tio;
void configure_stdout(void)
{
/* Save current stdout settings */
if (tcgetattr(STDOUT_FILENO, &old_stdio) < 0)
{
printf("Error: Saving current stdio settings failed\n");
exit(EXIT_FAILURE);
}
/* Prepare stdio settings */
bzero(&stdio, sizeof(stdio));
/* Control, input, output, local modes for stdio */
stdio.c_cflag = 0;
stdio.c_iflag = 0;
stdio.c_oflag = 0;
stdio.c_lflag = 0;
/* Control characters */
stdio.c_cc[VTIME] = 0; /* Inter-character timer unused */
stdio.c_cc[VMIN] = 1; /* Blocking read until 1 character received */
/* Activate stdio settings */
tcsetattr(STDOUT_FILENO, TCSANOW, &stdio);
tcsetattr(STDOUT_FILENO, TCSAFLUSH, &stdio);
}
void restore(void)
{
static int i=0;
tcflush(STDOUT_FILENO, TCIOFLUSH);
tcsetattr(STDOUT_FILENO, TCSANOW, &old_stdio);
tcsetattr(STDOUT_FILENO, TCSAFLUSH, &old_stdio);
tcsetattr(fd, TCSANOW, &old_tio);
tcsetattr(fd, TCSAFLUSH, &old_tio);
gotty_printf("Disconnected\n");
}
int connect_tty(void)
{
int console = 0;
fd_set rdfs; /* Read file descriptor set */
int maxfd; /* Maximum file desciptor used */
char c, c0 = 0, c1 = 0;
static bool first = true;
int status;
/* Open tty device */
fd = open(option.device, O_RDWR | O_NOCTTY );
if (fd <0)
{
perror(option.device);
exit(EXIT_FAILURE);
}
/* Make sure device is of tty type */
if (!isatty(fd))
{
printf("Error: Not a tty device");
exit(EXIT_FAILURE);
}
gotty_printf("Connected");
/* Save current port settings */
if (tcgetattr(fd, &old_tio) < 0)
{
printf("Error: Saving current port settings failed\n");
exit(EXIT_FAILURE);
}
/* Make sure we restore settings on exit */
if (first)
{
atexit(&restore);
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, console) + 1; /* Maximum bit entry (fd) to test */
/* Input loop */
while (true)
{
FD_ZERO(&rdfs);
FD_SET(fd, &rdfs);
FD_SET(console, &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, 1) > 0)
{
/* Print received tty character to stdout */
putchar(c);
fflush(stdout);
} else
{
if (!option.no_autoconnect)
gotty_printf("Disconnected");
return(EXIT_FAILURE);
}
}
if (FD_ISSET(console, &rdfs))
{
/* Input from stdin ready */
status = read(console, &c, 1);
/* Exit upon ctrl-g ctrl-q sequence */
c1 = c0;
c0 = c;
if ((c0 == CTRLQ) && (c1 == CTRLG))
exit(EXIT_SUCCESS);
/* Forward input to tty device */
status = write(fd, &c, 1);
}
}
return(EXIT_SUCCESS);
}