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dterm.c
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/* dterm.c Dumb terminal program 19/11/2004/dcs
*/
/*
* Copyright 2007 Rumsey Stokes Ltd
* Copyright 2017 Don Stokes
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation.
*
* 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
*
* 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 VERSION
#define VERSION "unknown"
#endif
#define COPYRIGHT \
"dterm version " VERSION " Copyright 2007 Don Stokes\n" \
"\n" \
"This program is free software; you can redistribute it and/or\n" \
"modify it under the terms of the GNU General Public License version 2\n" \
"as published by the Free Software Foundation.\n" \
"\n" \
"This program is distributed in the hope that it will be useful,\n" \
"but WITHOUT ANY WARRANTY; without even the implied warranty of\n" \
"MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\n" \
"GNU General Public License for more details.\n" \
"\n" \
"You should have received a copy of the GNU General Public License\n" \
"along with this program; if not, write to the Free Software\n" \
"Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA\n" \
"02110-1301, USA.\n"
#include <stdio.h>
#include <ctype.h>
#include <sys/types.h>
#include <sys/signal.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <fcntl.h>
#include <termios.h>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>
#include <time.h>
#include <signal.h>
#include <sys/select.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <errno.h>
#ifdef READLINE
#include <readline/readline.h>
#include <readline/history.h>
#endif /* READLINE */
#define FIXTTY if(istty) tcsetattr(0, TCSADRAIN, &savetio)
#define DIEP(s) { FIXTTY; perror(s); exit(1); }
#define DIE(s,m) { FIXTTY; fprintf(stderr, "%s: %s\n", s, m); exit(1); }
/*
Sigh
*/
#ifndef CCTS_OFLOW
#ifdef CRTSCTS
#define CCTS_OFLOW CRTSCTS
#endif /* CRTSCTS */
#endif /* ! CCTS_OFLOW */
/*
Valid speed settings.
*/
#include "speeds.h"
/*
Save the terminal settings here
*/
static struct termios intio, savetio;
static int fd = -1; /* Channel to port */
static int cmdchar = 035; /* Command character, default ^] */
static char *device = 0; /* Device, no default */
static int ispeed = B9600; /* Input speed, default 9600 bps */
static int ospeed = B9600; /* Output speed, default 9600 bps */
static int twostop = 0; /* Stop bits, if set to CSTOPB, use two */
static int parity = 0; /* Parity, -1 = mark, -2 = space 0=none */
/* PARENB enables parity, PARODD = odd */
static int bits = CS8; /* CS5-CS8 for 5-8 bits per character */
static int ctsflow = 0; /* CCTS_OFLOW enables CTS flow control */
static int xonflow = 0; /* IXON | IXOFF for in & out soft F/c */
static int modemcontrol = 0; /* Set to HUPCLto enable modem control */
static int markparity = 0; /* Mark parity: set high bit on output */
static int spaceparity = 0; /* Space parity: clear high output bit */
static int backspace = 0; /* Backspace char, send on BS or DEL */
static int maplf = 0; /* If set, map LF to CR */
static int ignorecr = 0; /* Ignore carriage returns */
static int crlf = 0; /* Send CRLF on CR */
static int istty; /* Result of isatty() */
static char *connname = 0; /* Connection name found in config */
static int sendbreak = 0; /* Break requested */
static int modem = 0; /* Current modem status */
static int setmodem = 0; /* Set modem status to this */
static int delay = 0; /* Millisecond delay after each key */
static int linedelay = 0; /* Millisecond delay after each CR */
static int showspecial = 0; /* Show special chars as [xx] */
static int noshell = 0; /* Prevent !<command> execution */
/* Hayyyeeellllllppppp!!!!
*/
static void
help() {
fprintf(stderr,
"dterm commands:\n"
"^%c Enter command mode quit, q Exit\n"
"show Display configuration help, h, ? Display this message\n"
"!<command> Execute shell command version Display version\n"
"@<filename> Get configuration from <filename> or !<command>\n"
"<device> Connect to <device> 300,1200,9600 Set speed\n"
"5, 6, 7, 8 Set bits per character 1, 2 Set stop bits\n"
"e, o, n, m, s Set parity speeds Show available speeds\n"
"xon,noxon XON/XOFF flow control"
#ifdef CCTS_OFLOW
"\tcts,nocts CTS flow control\n"
#else
"\n"
#endif
"dtr, nodtr Raise / lower DTR b Send a 500ms break\n"
"rts, norts Raise / lower RTS d, r Toggle DTR, RTS\n"
"rx <filename> Receive file (XMODEM) sx <filename> Send file (XMODEM)\n"
"rz Receive file (ZMODEM) sz <filename> Send file (ZMODEM)\n"
"modem Hang up modem on exit, exit if modem hangs up\n"
"nomodem Do not do modem control\n"
"bs, nobs Enable / disable mapping of Delete to Backspace\n"
"del, nodel Enable / disable mapping of Backspace to Delete\n"
"maplf, nomaplf Enable / disable mapping of LF to CR\n"
"igncr, noigncr Ignore / output carriage returns\n"
"crlf, nocrlf Enable / disable sending LF after each CR\n"
"delay=<n> Add delay of <n> ms after each charachter sent\n"
"crwait=<n> Add delay of <n> ms after each line sent\n"
"esc=<c> Set command mode character to Ctrl/<c>\n"
"ctrl,hex,noctrl Show control characters as ^n (except tab, CR, LF)\n"
, cmdchar + '@');
}
/*
Search for the default serial device.
Look for a USB device first; failing that, look for the first hard
wired device. Note that many motherboards include a hardware serial
device, but it might end in a motherboard header or less.
For Linux & BSD these are:
OS Onboard USB
Linux ttyS0 ttyUSB0
New BSD cuau0 cuaU0
Old BSD ttyd0 ttyU0
Note that this rather assumes that the existence of a device
name in /dev indicates the actual existence of a device.
Since USB devices can come and go, we look at the first four possible
devices.
*/
static char *
defaultdevice(void) {
static char devbuf[16];
int i;
struct stat sb;
for(i = 1; i < 4; i++) {
sprintf(devbuf, "/dev/ttyUSB%d", i);
if(!stat(devbuf, &sb)) /* Linux USB */
return devbuf;
sprintf(devbuf, "/dev/cuaU%d", i);
if(!stat(devbuf, &sb)) /* New BSD USB */
return devbuf;
sprintf(devbuf, "/dev/ttyU%d", i);
if(!stat(devbuf, &sb)) /* Old BSD USB */
return devbuf;
}
if(!stat("/dev/ttyS0", &sb)) /* Linux COM1 */
return "/dev/ttyS0";
if(!stat("/dev/cuau0", &sb)) /* New BSD COM1 */
return "/dev/cuau0";
if(!stat("/dev/ttyd0", &sb)) /* Old BSD COM1 */
return "/dev/ttyd0";
return 0; /* None of the above */
}
/*
Show current setup
*/
static void
showsetup() {
int i;
char hn[256];
gethostname(hn, sizeof(hn) - 1);
if(!device)
device = defaultdevice();
fprintf(stderr, "Host: %s\n", hn);
fprintf(stderr, "Port: %s\n", device ? device : "unassigned");
fprintf(stderr, "Communications parameters: ");
for(i = 0; speeds[i].s && speeds[i].c != ispeed; )
i++;
fprintf(stderr, "%d", speeds[i].s);
if(ospeed != ispeed) {
for(i = 0; speeds[i].s && speeds[i].c != ospeed; )
i++;
fprintf(stderr, "/%d", speeds[i].s);
}
if(bits == CS5) fprintf(stderr, " 5");
if(bits == CS6) fprintf(stderr, " 6");
if(bits == CS7) fprintf(stderr, " 7");
if(bits == CS8) fprintf(stderr, " 8");
if(parity == 0) fprintf(stderr, " n");
if(parity == PARENB) fprintf(stderr, " e");
if(parity == (PARENB|PARODD)) fprintf(stderr, " o");
if(parity == -1) fprintf(stderr, " m");
if(parity == -2) fprintf(stderr, " s");
if(twostop) fprintf(stderr, " 2\n");
else fprintf(stderr, " 1\n");
fprintf(stderr, "Flow/modem control:");
if(xonflow) fprintf(stderr, " xon");
if(ctsflow) fprintf(stderr, " cts");
if(modemcontrol)fprintf(stderr, " modem");
putc('\n', stderr);
fprintf(stderr, "Character mappings:");
if(backspace == 8) fprintf(stderr, " bs");
if(backspace == 127) fprintf(stderr, " del");
if(maplf) fprintf(stderr, " maplf");
if(ignorecr) fprintf(stderr, " igncr");
if(crlf) fprintf(stderr, " crlf");
if(showspecial == 1) fprintf(stderr, " ctrl");
if(showspecial == 2) fprintf(stderr, " hex");
putc('\n', stderr);
printf("Modem control: DTR: %s RTS: %s CTS: %s DSR: %s DCD: %s\n",
setmodem & TIOCM_DTR ? "on" : "off",
setmodem & TIOCM_RTS ? "on" : "off",
modem & TIOCM_CTS ? "on" : "off",
modem & TIOCM_DSR ? "on" : "off",
modem & TIOCM_CD ? "on" : "off");
fprintf(stderr, "Escape character: ^%c\n", cmdchar + '@');
fflush(stderr);
}
/*
Use the rzsz or lrzsz package to do file transfer
Mode should be "rx", "rb" or "rz" to receive a file, "sx", "sb" or "sz"
to send. "rz" & "rb" don't require a file name; the others do.
*/
static int
rzsz(char *mode, char *file) {
static char *pathenv = 0;
char path[1024];
char *cmd, *p, *pe;
int l;
struct stat sb;
pid_t pid;
int ws;
/*
Check file name
*/
if(*file == 0 && (mode[0] != 'r' || mode[1] == 'x')) {
fprintf(stderr, "File name required for %c%c\n",
mode[0], mode[1]);
return -1;
}
/*
Find the appropriate command
Search the path; for each element look for xx and lxx
(where xx are the first two chars of mode).
*/
if(!pathenv) {
pathenv = getenv("PATH");
if(!pathenv) pathenv = "/usr/bin:/usr/local/bin";
}
for(p = pathenv; p; p = pe) {
pe = strchr(p, ':');
if(pe) l = (pe++) - p;
else l = strlen(p);
if(*p != '/') continue;
snprintf(path, sizeof(path), "%.*s/%c%c",
l, p, mode[0], mode[1]);
if(!stat(path, &sb) && (sb.st_mode & S_IXUSR))
break;
snprintf(path, sizeof(path), "%.*s/l%c%c",
l, p, mode[0], mode[1]);
if(!stat(path, &sb) && (sb.st_mode & S_IXUSR))
break;
}
if(!p) {
fprintf(stderr, "%c%c not installed\n", mode[0], mode[1]);
return -1;
}
/*
Get the command name
*/
/*
Fork subprocess. Set stdin & stdout to the serial line
stderr remains on the console for progress messages
*/
pid = fork();
if(pid == 0) {
dup2(fd, 0);
dup2(fd, 1);
cmd = strrchr(path, '/');
if(*file) execl(path, cmd, file, NULL);
else execl(path, cmd, NULL);
_exit(127);
}
else if(pid == -1) {
perror("fork");
return -1;
}
/*
Wait for the process to complete and give a meaningful
response
*/
signal(SIGINT, SIG_IGN);
signal(SIGQUIT, SIG_IGN);
signal(SIGTERM, SIG_IGN);
while(waitpid(pid, &ws, 0) != pid) {}
signal(SIGINT, SIG_DFL);
signal(SIGQUIT, SIG_DFL);
signal(SIGTERM, SIG_DFL);
if(WIFSIGNALED(ws)) {
fprintf(stderr, "Terminated on signal %d%s\n", WTERMSIG(ws),
WCOREDUMP(ws) ? " (core dumped)" : "");
return -1;
}
if(WEXITSTATUS(ws))
return -1;
return 0;
}
static int readconfig(char *, char *); /* Forward declaration */
/*
Process commands passed as strings, may be several commands on a line
Allow ugliness like 8n1 -- treat as 8, n, 1
*/
static int
setup(char *s, char *cffile, int cfline) {
char *t, *d;
int i,j,k;
int ret = 0;
struct stat sb;
char ttybuf[128];
int justospeed = 0;
while(*s) {
/*
Skip whitespace, commas
*/
while(isspace(*s) || *s == ',')
s++;
if(!*s) break;
/*
'?' = help
*/
if(*s == '?') {
help();
return -4;
}
/*
'!' = shell command
*/
if(*s == '!' && !noshell) {
if((t = strchr(s, '\n')))
*t = 0;
i = system(++s);
break;
}
/*
@! <command>
Get commands from shell
*/
if(s[0] == '@' && s[1] == '!') {
if((t = strchr(s, '\n')))
*t = 0;
k = readconfig(s+1, 0);
if(k == -2) {
if(cffile)
fprintf(stderr, "in %s:%d: ",
cffile, cfline);
fprintf(stderr, "%s: %s\n", s+1,
strerror(errno));
ret = -1;
}
break;
}
/*
File transfer (sx, sz, rx, rz)
Run rzsz to perform the actual file transfer
Allow "sxfilename", "sx filename" or just "rz"
*/
if((s[0] == 's' || s[0] == 'r') &&
(s[1] == 'x' || s[1] == 'z')) {
if((t = strchr(s, '\n')))
*t = 0;
for(t = s + 2; isspace(*t); ) t++;
return rzsz(s, t);
}
/*
If a number, process it.
If it's a valid speed, use that -- if nnn/mmm, set both to nnn
for the first time, and flag things so mmm just sets ospeed
5-8 = data bits, 1,2 sets stops
Anything else is error
*/
if(isdigit(*s)) {
j = strtol(s, &s, 10);
for(k = 1; speeds[k].s; k++)
if(speeds[k].s == j)
break;
if(speeds[k].s) {
ospeed = speeds[k].c;
if(!justospeed)
ispeed = ospeed;
if(*s == '/') {
s++;
justospeed = 1;
}
else justospeed = 0;
}
else if(j == 5) bits = CS5;
else if(j == 6) bits = CS6;
else if(j == 7) bits = CS7;
else if(j == 8) bits = CS8;
else if(j == 1) twostop = 0;
else if(j == 2) twostop = CSTOPB;
else {
if(cffile)
fprintf(stderr, "in %s:%d: ",
cffile, cfline);
fprintf(stderr, "%d: invalid speed/bits\n", j);
ret = -1;
}
if(parity < 0 && bits != CS7)
parity = 0;
}
/*
Otherwise, get the alpha-only keyword, see if it matches anything
useful.
*/
else {
t = s;
while(isalpha(*t)) t++;
j = *t;
*t = 0;
if( !strcasecmp(s, "xon"))
xonflow = IXON | IXOFF;
else if(!strcasecmp(s, "noxon"))
xonflow = 0;
#ifdef CCTS_OFLOW
else if(!strcasecmp(s, "cts"))
ctsflow = CCTS_OFLOW;
else if(!strcasecmp(s, "nocts"))
ctsflow = 0;
#endif
else if(!strcasecmp(s, "modem"))
modemcontrol = HUPCL;
else if(!strcasecmp(s, "nomodem"))
modemcontrol = 0;
else if(!strcasecmp(s, "E"))
parity = PARENB;
else if(!strcasecmp(s, "O"))
parity = PARENB | PARODD;
else if(!strcasecmp(s, "M")) {
parity = -1;
bits = CS7;
}
else if(!strcasecmp(s, "S")) {
parity = -2;
bits = CS7;
}
else if(!strcasecmp(s, "N"))
parity = 0;
else if(!strcasecmp(s, "q") || !strcasecmp(s, "quit"))
ret = -3;
else if(!strcasecmp(s, "h") || !strcasecmp(s, "help"))
help();
else if(!strcasecmp(s, "del"))
backspace = 127;
else if(!strcasecmp(s, "bs"))
backspace = 8;
else if(!strcasecmp(s,"nobs") || !strcasecmp(s,"nodel"))
backspace = 0;
else if(!strcasecmp(s, "noesc"))
cmdchar = 0;
else if(!strcasecmp(s, "maplf"))
maplf = 1;
else if(!strcasecmp(s, "nomaplf"))
maplf = 0;
else if(!strcasecmp(s, "igncr"))
ignorecr = 1;
else if(!strcasecmp(s, "noigncr"))
ignorecr = 0;
else if(!strcasecmp(s, "crlf"))
crlf = 1;
else if(!strcasecmp(s, "nocrlf"))
crlf = 0;
else if(!strcasecmp(s, "noshell"))
noshell = 1;
else if(!strcasecmp(s, "b"))
sendbreak = 1;
else if(!strcasecmp(s, "d"))
setmodem ^= TIOCM_DTR;
else if(!strcasecmp(s, "r"))
setmodem ^= TIOCM_RTS;
else if(!strcasecmp(s, "dtr"))
setmodem |= TIOCM_DTR;
else if(!strcasecmp(s, "rts"))
setmodem |= TIOCM_RTS;
else if(!strcasecmp(s, "nodtr"))
setmodem &= ~TIOCM_DTR;
else if(!strcasecmp(s, "norts"))
setmodem &= ~TIOCM_RTS;
else if(!strcasecmp(s, "show"))
showsetup();
else if(!strcasecmp(s, "version"))
fputs(COPYRIGHT, stderr);
else if(!strcasecmp(s, "ctrl"))
showspecial = 1;
else if(!strcasecmp(s, "hex"))
showspecial = 2;
else if(!strcasecmp(s, "noctrl"))
showspecial = 0;
else if(!strcasecmp(s, "speeds")) {
for(i = 0; speeds[i].s; i++) {
if(i && !(i % 4))
putchar('\n');
printf("%10d", speeds[i].s);
}
putchar('\n');
}
/*
No?
@<filename> includes a file
!cmd Run a command
esc=c sets escape char
<device> select device
*/
else {
*t = j;
while(*t && !isspace(*t) && *t != ',')
t++;
j = *t;
*t = 0;
if(*s == '@') {
k = readconfig(++s, 0);
if(k == -2) {
if(cffile)
fprintf(stderr,
"in %s:%d: ",
cffile, cfline);
fprintf(stderr, "%s: %s\n",
s, strerror(errno));
ret = -1;
}
goto next;
}
if(!strncasecmp(s, "esc=", 4)) {
cmdchar = s[4] & 0x1f;
goto next;
}
else if(!strncasecmp(s, "delay=", 6)) {
delay = atoi(s+6);
goto next;
}
else if(!strncasecmp(s, "crwait=", 7)) {
linedelay = atoi(s+7);
goto next;
}
d = s;
k = stat(d, &sb);
if(k && *d != '/') {
sprintf(ttybuf, "/dev/%.100s", d);
d = ttybuf;
k = stat(d, &sb);
}
if(!k) {
if((sb.st_mode & S_IFMT) == S_IFCHR) {
ret = 1;
device = strdup(d);
goto next;
}
}
if(cffile)
fprintf(stderr, "in %s:%d: ",
cffile, cfline);
fprintf(stderr,
"%s: unrecognised keyword/device\n", s);
ret = -1;
}
next: *t = j;
s = t;
}
}
return ret;
}
/*
Read a config file
Input lines can be lists of config words, or in the form
name: words
If name: form, only lines matching passed name are used
*/
static int
readconfig(char *file, char *name) {
char buf[1024];
FILE *f;
char *s, *t;
int lineno = 0;
int ret = 0, r;
/*
~/file = get file from $HOME/file
*/
if(!name) name = connname;
if(*file == '~' && file[1] == '/' && (s = getenv("HOME"))) {
snprintf(buf, sizeof(buf), "%s/%s", s, file+2);
file = buf;
}
/*
Return -2 if can't open
*/
if(*file == '!' && !noshell)
f = popen(++file, "r");
else f = fopen(file, "r");
if(!f) return -2;
/*
Read input, strip # commends
Count lines
Keep track of return code
*/
while(fgets(buf, sizeof(buf), f)) {
lineno++;
if((s = strchr(buf, '#')))
*s = 0;
for(s = buf; isspace(*s);)
s++;
if(!*s) continue;
for(t = s; *t && *t != ':' && *t != ',' && !isspace(*t); )
t++;
if(*t == ':') {
*t++ = 0;
if(!name)
continue;
if(strcmp(name, s))
continue;
s = t;
connname = name;
}
r = setup(s, file, lineno);
if(r < 0)
ret = r;
if(r > 0 && !ret)
ret = 1;
}
fclose(f);
return ret;
}
/*
Sleep n milliseconds
*/
static void
millisleep(int n) {
struct timespec t;
t.tv_sec = n / 1000;
t.tv_nsec = (n % 1000) * 1000000;
nanosleep(&t, 0);
}
/*
Set up the port
*/
static int
setupport(int fd) {
int parityflags;
int modemflags;
struct termios tio;
int abits;
int m;
/*
See what to do with parity
*/
markparity = 0;
parityflags = parity;
abits = bits;
if(parity == -1) {
parityflags = 0;
markparity = ISTRIP;
if(bits == CS7)
abits = CS8;
}
else if(parity == -2) {
parityflags = 0;
spaceparity = ISTRIP;
if(bits == CS7)
abits = CS8;
}
/*
If no modem control, use local mode
*/
modemflags = ctsflow | modemcontrol;
if(!modemflags)
modemflags = CLOCAL;
/*
Set the speed and params
*/
tcgetattr(fd, &tio);
tio.c_iflag = IGNBRK | IGNPAR | xonflow | spaceparity | markparity;
tio.c_cflag = CREAD | HUPCL | modemflags | abits | parityflags;
tio.c_oflag = 0;
tio.c_lflag = 0;
cfsetispeed(&tio, ispeed);
cfsetospeed(&tio, ospeed);
if(tcsetattr(fd, TCSAFLUSH, &tio) == -1)
return -1;
/*
Set up the modem lines
*/
ioctl(fd, TIOCMGET, &modem);
if((modem & (TIOCM_RTS | TIOCM_DTR)) != (setmodem & (TIOCM_RTS |
TIOCM_DTR))) {
m = setmodem & (TIOCM_RTS | TIOCM_DTR);
ioctl(fd, TIOCMBIS, &m);
m = (~setmodem) & (TIOCM_RTS | TIOCM_DTR);
ioctl(fd, TIOCMBIC, &m);
}
/*
Send a break if requested
*/
if(sendbreak) {
ioctl(fd, TIOCSBRK, 0);
millisleep(500);
ioctl(fd, TIOCCBRK, 0);
sendbreak = 0;
}
/*
Get the current modem status
*/
ioctl(fd, TIOCMGET, &modem);
setmodem = modem;
return 0;
}
/*
Set up the modem. This is a little tricky due to the need to
ensure the modem does not block before we set it up.
*/
static int
openport(char *device) {
int fd;
if((fd = open(device, O_RDWR|O_NONBLOCK, 0)) < 0)
DIEP(device)
if(setupport(fd) < 0)
DIEP(device)
millisleep(10);
fcntl(fd, F_SETFL, 0);
ioctl(fd, TIOCMGET, &modem);
setmodem = modem;
setenv("DTERM_PORT", device, 1);
return fd;
}
/*
Usage
*/
static void
usage(char *this) {
fprintf(stderr, "Usage: %s port/setup\n"
" '%s help' for help\n", this, this);
exit(1);
}
#define WRITE(fd,b,l) { if(write(fd,b,l) < 1) DIEP("write") }
int
main(int argc, char **argv) {
int nfd;
int i, j, c;
unsigned char inbuf;
char buf[1024];
char *cmdbuf;
char cbuf[8];
char *s;
int done;
fd_set fds;
struct timeval delay_tv, *readdelay;
/*
Do the right things depending on whether stdin & stdout are TTYs
If the input is a TTY, we need to put it into non-canonical mode
(which we'll actually do later); otherwise, default to turning
LFs from a file into CRs. (See [no]maplf setup command.)
If the output is a TTY, default to passing CR transparently;
otherwise default to ignoring CR so that output is logged to a
files etc nicely. (See [no]igncr.)
*/
istty = isatty(0);
if(istty) {
tcgetattr(0, &savetio);
maplf = 0;
}
else maplf = 1;
if(isatty(1))
ignorecr = 0;
else ignorecr = 1;
/*
Read default config, if no private .dtermrc, use /etc/dtermrc
*/
setmodem = modem = TIOCM_DTR | TIOCM_RTS;
if(readconfig("~/.dtermrc", argv[1]) == -2)
readconfig("/etc/dtermrc", argv[1]);
/*
Parse args
If only arg is "help", exit
*/
i = 1;
if(connname) i = 2;
for(; i < argc; i++)
if(setup(argv[i], 0, 0) < 0)
usage(argv[0]);
if(argc == 2 && !strcasecmp(argv[1], "help"))
exit(0);
/*
If no device specified, have a crack at finding a default device.
Bail if we couldn't find it.
*/
if(!device && !(device = defaultdevice())) {
fprintf(stderr, "Could not find default device\n");
usage(argv[0]);
}
/*
If the controlling TTY is in fact a TTY, set it up
*/
if(istty) {
intio = savetio;
intio.c_oflag = 0;
intio.c_lflag = 0;
intio.c_iflag = savetio.c_iflag & ~(INLCR|IGNCR|ICRNL);
intio.c_cc[VEOF] = _POSIX_VDISABLE;
intio.c_cc[VEOL] = _POSIX_VDISABLE;
intio.c_cc[VEOL2] = _POSIX_VDISABLE;
intio.c_cc[VERASE] = _POSIX_VDISABLE;
intio.c_cc[VWERASE] = _POSIX_VDISABLE;
intio.c_cc[VKILL] = _POSIX_VDISABLE;
intio.c_cc[VREPRINT] = _POSIX_VDISABLE;
intio.c_cc[VINTR] = _POSIX_VDISABLE;
intio.c_cc[VQUIT] = _POSIX_VDISABLE;
intio.c_cc[VSUSP] = _POSIX_VDISABLE;
#ifdef VDSUSP
intio.c_cc[VDSUSP] = _POSIX_VDISABLE;
#endif
intio.c_cc[VLNEXT] = _POSIX_VDISABLE;
intio.c_cc[VDISCARD] = _POSIX_VDISABLE;
#ifdef VSTATUS
intio.c_cc[VSTATUS] = _POSIX_VDISABLE;
#endif
tcsetattr(0, TCSADRAIN, &intio);
}
/*
Connect to serial port
*/
fd = openport(device);
if(fd < 0) exit(1);
/*
Main loop
*/
readdelay = 0;
done = 0;
while(!done) {
/*
Set up the select() call
If readdelay is not 0, we're waiting for things to go quiet so we
can exit.
Errors kill us, execpt for interrupted calls
0 return only happens if readdelay is set, so we exit then
*/
FD_ZERO(&fds);
if(!readdelay)
FD_SET(0, &fds);
FD_SET(fd, &fds);
i = select(fd + 1, &fds, 0,0, readdelay);
if(i == -1 && errno != EINTR)
DIEP("select");
if(i == 0 && readdelay)
break;
/*
If input from line, read a full buffer in
IgnoreCR means sucking CRs out of the buffer (yuck)
If EOF (e.g. hangup), exit nicely.
*/
if(FD_ISSET(fd, &fds)) {
i = read(fd, buf, sizeof(buf));
if(i < 0)
DIEP(device);
if(!i) break;
if(showspecial) {
s = buf;
do {
c = 0;
for(j = 0; j < i; j++) {
c = (unsigned char) s[j];
if(showspecial == 2 && (
c == '\t' || c > '~'))
break;
if(c == '\r' && ignorecr)
break;
if(( c < ' ' && c != '\t'
&& c != '\r' && c != '\n')
|| (c > '~' && c < 160))
break;
}
if(j) WRITE(1, s, j);
if(j >= i)
break;
if(c == '\r' && ignorecr) {
/* Do nothing */
}
else if(c < 32 && showspecial != 2) {
cbuf[0] = '^';
cbuf[1] = c + '@';
WRITE(1, cbuf, 2);
}
else if(c == 127 && showspecial != 2)
WRITE(1, "[DEL]", 5)
else {
sprintf(cbuf, "[%02x]", c);
WRITE(1, cbuf, 4);
}
j++;
s += j;
i -= j;
} while(i > 0);