[unix-history] / usr / src / usr.bin / tip / tip.c

/*	tip.c	4.14	83/06/15	*/

/*
 * tip - UNIX link to other systems
 *  tip [-v] [-speed] system-name
 * or
 *  cu phone-number [-s speed] [-l line] [-a acu]
 */
#include "tip.h"

static char *sccsid = "@(#)tip.c	4.14 %G%";

/*
 * Baud rate mapping table
 */
int bauds[] = {
	0, 50, 75, 110, 134, 150, 200, 300, 600,
	1200, 1800, 2400, 4800, 9600, 19200, -1
};

#ifdef VMUNIX
int	disc = OTTYDISC;		/* tip normally runs this way */
#endif

int	intprompt();
int	timeout();
int	cleanup();
char	*sname();
extern char *sprintf();

main(argc, argv)
	char *argv[];
{
	char *system = NOSTR;
	register int i;
	register char *p;
	char sbuf[12];

	if (equal(sname(argv[0]), "cu")) {
		cumain(argc, argv);
		cumode = 1;
		goto cucommon;
	}

	if (argc > 4) {
		fprintf(stderr, "usage: tip [-v] [-speed] [system-name]\n");
		exit(1);
	}
	if (!isatty(0)) {
		fprintf(stderr, "tip: must be interactive\n");
		exit(1);
	}

	for (; argc > 1; argv++, argc--) {
		if (argv[1][0] != '-')
			system = argv[1];
		else switch (argv[1][1]) {

		case 'v':
			vflag++;
			break;

		case '0': case '1': case '2': case '3': case '4':
		case '5': case '6': case '7': case '8': case '9':
			BR = atoi(&argv[1][1]);
			break;

		default:
			fprintf(stderr, "tip: %s, unknown option\n", argv[1]);
			break;
		}
	}

	if (system == NOSTR)
		goto notnumber;
	for (p = system; *p; p++)
		if (isalpha(*p))
			goto notnumber;
	PN = system;		/* system name is really a phone number */
	system = sprintf(sbuf, "tip%d", BR);

notnumber:
	signal(SIGINT, cleanup);
	signal(SIGQUIT, cleanup);
	signal(SIGHUP, cleanup);
	signal(SIGTERM, cleanup);

	if ((i = hunt(system)) == 0) {
		printf("all ports busy\n");
		exit(3);
	}
	if (i == -1) {
		printf("link down\n");
		delock(uucplock);
		exit(3);
	}
	setbuf(stdout, NULL);
	loginit();
	/*
	 * Now that we have the logfile and the ACU open
	 *  return to the real uid and gid.  These things will
	 *  be closed on exit.  Note that we can't run as root,
	 *  because locking mechanism on the tty and the accounting
	 *  will be bypassed.
	 */
	setgid(getgid());
	setuid(getuid());

	/*
	 * Kludge, their's no easy way to get the initialization
	 *   in the right order, so force it here
	 */
	if ((PH = getenv("PHONES")) == NOSTR)
		PH = "/etc/phones";
	vinit();				/* init variables */
	setparity();				/* set the parity table */
	if ((i = speed(number(value(BAUDRATE)))) == NULL) {
		printf("tip: bad baud rate %d\n", number(value(BAUDRATE)));
		delock(uucplock);
		exit(3);
	}

	/*
	 * Hardwired connections require the
	 *  line speed set before they make any transmissions
	 *  (this is particularly true of things like a DF03-AC)
	 */
	if (HW)
		ttysetup(i);
	if (p = connect()) {
		printf("\07%s\n[EOT]\n", p);
		delock(uucplock);
		exit(1);
	}
	if (!HW)
		ttysetup(i);
cucommon:
	/*
	 * From here down the code is shared with
	 * the "cu" version of tip.
	 */
	ioctl(0, TIOCGETP, (char *)&defarg);
	ioctl(0, TIOCGETC, (char *)&defchars);
	ioctl(0, TIOCGLTC, (char *)&deflchars);
#ifdef VMUNIX
	ioctl(0, TIOCGETD, (char *)&odisc);
#endif
	arg = defarg;
	arg.sg_flags = ANYP | CBREAK;
	tchars = defchars;
	tchars.t_intrc = tchars.t_quitc = -1;
	ltchars = deflchars;
	ltchars.t_suspc = ltchars.t_dsuspc = ltchars.t_flushc
		= ltchars.t_lnextc = -1;
	raw();

	pipe(fildes); pipe(repdes);
	signal(SIGALRM, timeout);

	/*
	 * Everything's set up now:
	 *	connection established (hardwired or diaulup)
	 *	line conditioned (baud rate, mode, etc.)
	 *	internal data structures (variables)
	 * so, fork one process for local side and one for remote.
	 */
	printf(cumode ? "Connected\r\n" : "\07connected\r\n");
	if (pid = fork())
		tipin();
	else
		tipout();
	/*NOTREACHED*/
}

cleanup()
{
	delock(uucplock);
#ifdef VMUNIX
	if (odisc)
		ioctl(0, TIOCSETD, (char *)&odisc);
#endif
	exit(0);
}

/*
 * put the controlling keyboard into raw mode
 */
raw()
{
	ioctl(0, TIOCSETP, &arg);
	ioctl(0, TIOCSETC, &tchars);
	ioctl(0, TIOCSLTC, &ltchars);
#ifdef VMUNIX
	ioctl(0, TIOCSETD, (char *)&disc);
#endif
}


/*
 * return keyboard to normal mode
 */
unraw()
{
#ifdef VMUNIX
	ioctl(0, TIOCSETD, (char *)&odisc);
#endif
	ioctl(0, TIOCSETP, (char *)&defarg);
	ioctl(0, TIOCSETC, (char *)&defchars);
	ioctl(0, TIOCSLTC, (char *)&deflchars);
}

/*
 * Print string ``s'', then read a string
 *  in from the terminal.  Handles signals & allows use of
 *  normal erase and kill characters.
 */
prompt(s, p)
	char *s;
	register char *p;
{
	register char *b = p;

	stoprompt = 0;
	signal(SIGINT, intprompt);
	signal(SIGQUIT, SIG_IGN);
	unraw();
	printf("%s", s);
	while ((*p = getchar()) != EOF && *p != '\n') {
		if (stoprompt)
			goto pbreak;
		p++;
	}
	*p = '\0';
pbreak:
	raw();
	signal(SIGINT, SIG_DFL);
	signal(SIGQUIT,SIG_DFL);
	return(stoprompt || p == b);
}

/*
 * Interrupt service routine during prompting
 */
intprompt()
{
	signal(SIGINT, SIG_IGN);
	stoprompt = 1;
	printf("\r\n");
}

/*
 * ****TIPIN   TIPIN****
 */
tipin()
{
	char gch, bol = 1;

	/*
	 * Kinda klugey here...
	 *   check for scripting being turned on from the .tiprc file,
	 *   but be careful about just using setscript(), as we may
	 *   send a SIGEMT before tipout has a chance to set up catching
	 *   it; so wait a second, then setscript()
	 */
	if (boolean(value(SCRIPT))) {
		sleep(1);
		setscript();
	}

	while (1) {
		gch = getchar()&0177;
		if ((gch == character(value(ESCAPE))) && bol) {
			if (!(gch = escape()))
				continue;
		} else if (!cumode && gch == character(value(RAISECHAR))) {
			boolean(value(RAISE)) = !boolean(value(RAISE));
			continue;
		} else if (gch == '\r') {
			bol = 1;
			pwrite(FD, &gch, 1);
			if (boolean(value(HALFDUPLEX)))
				printf("\r\n");
			continue;
		} else if (!cumode && gch == character(value(FORCE)))
			gch = getchar()&0177;
		bol = any(gch, value(EOL));
		if (boolean(value(RAISE)) && islower(gch))
			gch = toupper(gch);
		pwrite(FD, &gch, 1);
		if (boolean(value(HALFDUPLEX)))
			printf("%c", gch);
	}
}

/*
 * Escape handler --
 *  called on recognition of ``escapec'' at the beginning of a line
 */
escape()
{
	register char gch;
	register esctable_t *p;
	char c = character(value(ESCAPE));
	extern esctable_t etable[];

	gch = (getchar()&0177);
	for (p = etable; p->e_char; p++)
		if (p->e_char == gch) {
			if ((p->e_flags&PRIV) && getuid())
				continue;
			printf("%s", ctrl(c));
			(*p->e_func)(gch);
			return(0);
		}
	/* ESCAPE ESCAPE forces ESCAPE */
	if (c != gch)
		pwrite(FD, &c, 1);
	return(gch);
}

speed(n)
{
	register int *p;

	for (p = bauds; *p != -1;  p++)
		if (*p == n)
			return(p-bauds);
	return(NULL);
}

any(c, p)
	register char c, *p;
{
	if (p)
	while (*p)
		if (*p++ == c)
			return(1);
	return(0);
}

size(s)
	register char	*s;
{
	register int	i = 0;

	while (*s++) i++;
	return(i);
}

char *
interp(s)
	register char *s;
{
	static char buf[256];
	register char *p = buf, c, *q;

	while (c = *s++) {
		for (q = "\nn\rr\tt\ff\033E\bb"; *q; q++)
			if (*q++ == c) {
				*p++ = '\\'; *p++ = *q;
				goto next;
			}
		if (c < 040) {
			*p++ = '^'; *p++ = c + 'A'-1;
		} else if (c == 0177) {
			*p++ = '^'; *p++ = '?';
		} else
			*p++ = c;
	next:
		;
	}
	*p = '\0';
	return(buf);
}

char *
ctrl(c)
	char c;
{
	static char s[3];

	if (c < 040 || c == 0177) {
		s[0] = '^';
		s[1] = c == 0177 ? '?' : c+'A'-1;
		s[2] = '\0';
	} else {
		s[0] = c;
		s[1] = '\0';
	}
	return(s);
}

/*
 * Help command
 */
help(c)
	char c;
{
	register esctable_t *p;
	extern esctable_t etable[];

	printf("%c\r\n", c);
	for (p = etable; p->e_char; p++) {
		if ((p->e_flags&PRIV) && getuid())
			continue;
		printf("%2s", ctrl(character(value(ESCAPE))));
		printf("%-2s %c   %s\r\n", ctrl(p->e_char),
			p->e_flags&EXP ? '*': ' ', p->e_help);
	}
}

/*
 * Set up the "remote" tty's state
 */
ttysetup(speed)
{
#ifdef VMUNIX
	unsigned bits = LDECCTQ;
#endif

	arg.sg_ispeed = arg.sg_ospeed = speed;
	if (boolean(value(TAND)))
		arg.sg_flags = TANDEM|RAW;
	else
		arg.sg_flags = RAW;
	ioctl(FD, TIOCSETP, (char *)&arg);
#ifdef VMUNIX
	ioctl(FD, TIOCLBIS, (char *)&bits);
#endif
}

/*
 * Return "simple" name from a file name,
 * strip leading directories.
 */
char *
sname(s)
	register char *s;
{
	register char *p = s;

	while (*s)
		if (*s++ == '/')
			p = s;
	return (p);
}

extern char chartab[];
static char partab[0200];

/*
 * do a write to the remote machine with the correct parity
 * we are doing 8 bit wide output, so we just generate a character
 * with the right parity and output it.
 */
pwrite(fd, buf, n)
	int fd;
	char *buf;
	register int n;
{
	register int i;
	register char *bp = buf;

	for (i = 0, bp = buf; i < n; i++, bp++) {
		*bp = partab[(*bp) & 0177];
	}
	write(fd, buf, n);
}

/*
 * build a parity table with the right high-order bit
 * copy an even-parity table and doctor it
 */
setparity()
{
	int i;
	char *parity;

	if (value(PARITY) == NOSTR)
		value(PARITY) = "even";

	parity = value(PARITY);

	for (i = 0; i < 0200; i++)
		partab[i] = chartab[i];

	if (equal(parity, "odd")) {
		for (i = 0; i < 0200; i++)
			partab[i] ^= 0200;	/* reverse bit 7 */
	}
	else if (equal(parity, "none") || equal(parity, "zero")) {
		for (i = 0; i < 0200; i++)
			partab[i] &= ~0200;	/* turn off bit 7 */
	}
	else if (equal(parity, "one")) {
		for (i = 0; i < 0200; i++)
			partab[i] |= 0200;	/* turn on bit 7 */
	}
	else if (equal(parity, "even")) {
		/* table is already even parity */
	}
	else {
		fprintf(stderr, "parity value %s unknown\n", PA);
		fflush(stderr);
	}
}
Commit	Line	Data
6b46907f	1	/* tip.c 4.14 83/06/15 */
3f48242d	2
5f50159a	3	/*
3f48242d	4	* tip - UNIX link to other systems
5f50159a	5	* tip [-v] [-speed] system-name
3f48242d SL	6	* or
3f48242d SL	7	* cu phone-number [-s speed] [-l line] [-a acu]
5f50159a	8	*/
5f50159a BJ	9	#include "tip.h"
5f50159a BJ	10
6b46907f RC	11	static char *sccsid = "@(#)tip.c 4.14 %G%";
6b46907f RC	12
5f50159a BJ	13	/*
	14	* Baud rate mapping table
	15	*/
	16	int bauds[] = {
	17	0, 50, 75, 110, 134, 150, 200, 300, 600,
	18	1200, 1800, 2400, 4800, 9600, 19200, -1
	19	};
	20
4b675d70 SL	21	#ifdef VMUNIX
	22	int disc = OTTYDISC; /* tip normally runs this way */
	23	#endif
	24
5f50159a BJ	25	int intprompt();
5f50159a BJ	26	int timeout();
3f48242d	27	int cleanup();
c731dacc BS	28	char *sname();
c731dacc BS	29	extern char *sprintf();
5f50159a BJ	30
5f50159a BJ	31	main(argc, argv)
d8feebc2	32	char *argv[];
5f50159a BJ	33	{
	34	char *system = NOSTR;
	35	register int i;
c731dacc BS	36	register char *p;
c731dacc BS	37	char sbuf[12];
5f50159a	38
c731dacc	39	if (equal(sname(argv[0]), "cu")) {
3f48242d SL	40	cumain(argc, argv);
	41	cumode = 1;
	42	goto cucommon;
	43	}
	44
5f50159a BJ	45	if (argc > 4) {
	46	fprintf(stderr, "usage: tip [-v] [-speed] [system-name]\n");
	47	exit(1);
	48	}
	49	if (!isatty(0)) {
	50	fprintf(stderr, "tip: must be interactive\n");
	51	exit(1);
	52	}
c731dacc BS	53
	54	for (; argc > 1; argv++, argc--) {
	55	if (argv[1][0] != '-')
	56	system = argv[1];
	57	else switch (argv[1][1]) {
	58
	59	case 'v':
	60	vflag++;
	61	break;
	62
	63	case '0': case '1': case '2': case '3': case '4':
	64	case '5': case '6': case '7': case '8': case '9':
	65	BR = atoi(&argv[1][1]);
	66	break;
	67
	68	default:
	69	fprintf(stderr, "tip: %s, unknown option\n", argv[1]);
	70	break;
	71	}
	72	}
	73
d080fb0b BS	74	if (system == NOSTR)
d080fb0b BS	75	goto notnumber;
c731dacc BS	76	for (p = system; *p; p++)
	77	if (isalpha(*p))
	78	goto notnumber;
	79	PN = system; /* system name is really a phone number */
	80	system = sprintf(sbuf, "tip%d", BR);
	81
	82	notnumber:
5f50159a BJ	83	signal(SIGINT, cleanup);
	84	signal(SIGQUIT, cleanup);
	85	signal(SIGHUP, cleanup);
	86	signal(SIGTERM, cleanup);
f0211bf2	87
5f50159a BJ	88	if ((i = hunt(system)) == 0) {
	89	printf("all ports busy\n");
	90	exit(3);
	91	}
	92	if (i == -1) {
	93	printf("link down\n");
1603e05e	94	delock(uucplock);
5f50159a BJ	95	exit(3);
5f50159a BJ	96	}
eaa86232	97	setbuf(stdout, NULL);
5f50159a BJ	98	loginit();
	99	/*
	100	* Now that we have the logfile and the ACU open
	101	* return to the real uid and gid. These things will
	102	* be closed on exit. Note that we can't run as root,
	103	* because locking mechanism on the tty and the accounting
	104	* will be bypassed.
	105	*/
5f50159a	106	setgid(getgid());
6b46907f	107	setuid(getuid());
c731dacc	108
5f50159a BJ	109	/*
	110	* Kludge, their's no easy way to get the initialization
	111	* in the right order, so force it here
	112	*/
	113	if ((PH = getenv("PHONES")) == NOSTR)
	114	PH = "/etc/phones";
	115	vinit(); /* init variables */
6b46907f	116	setparity(); /* set the parity table */
4b675d70	117	if ((i = speed(number(value(BAUDRATE)))) == NULL) {
5f50159a BJ	118	printf("tip: bad baud rate %d\n", number(value(BAUDRATE)));
	119	delock(uucplock);
	120	exit(3);
	121	}
f0211bf2	122
4b675d70 SL	123	/*
	124	* Hardwired connections require the
	125	* line speed set before they make any transmissions
	126	* (this is particularly true of things like a DF03-AC)
	127	*/
	128	if (HW)
	129	ttysetup(i);
f0211bf2 SL	130	if (p = connect()) {
	131	printf("\07%s\n[EOT]\n", p);
	132	delock(uucplock);
	133	exit(1);
	134	}
4b675d70 SL	135	if (!HW)
4b675d70 SL	136	ttysetup(i);
3f48242d	137	cucommon:
5f50159a	138	/*
3f48242d SL	139	* From here down the code is shared with
3f48242d SL	140	* the "cu" version of tip.
5f50159a	141	*/
4b675d70 SL	142	ioctl(0, TIOCGETP, (char *)&defarg);
4b675d70 SL	143	ioctl(0, TIOCGETC, (char *)&defchars);
c5d1037a	144	ioctl(0, TIOCGLTC, (char *)&deflchars);
5d1f1475	145	#ifdef VMUNIX
4b675d70	146	ioctl(0, TIOCGETD, (char *)&odisc);
5d1f1475	147	#endif
5f50159a BJ	148	arg = defarg;
	149	arg.sg_flags = ANYP \| CBREAK;
	150	tchars = defchars;
	151	tchars.t_intrc = tchars.t_quitc = -1;
c5d1037a BJ	152	ltchars = deflchars;
	153	ltchars.t_suspc = ltchars.t_dsuspc = ltchars.t_flushc
	154	= ltchars.t_lnextc = -1;
5f50159a	155	raw();
4b675d70	156
5f50159a BJ	157	pipe(fildes); pipe(repdes);
5f50159a BJ	158	signal(SIGALRM, timeout);
f0211bf2 SL	159
	160	/*
	161	* Everything's set up now:
	162	* connection established (hardwired or diaulup)
	163	* line conditioned (baud rate, mode, etc.)
	164	* internal data structures (variables)
	165	* so, fork one process for local side and one for remote.
	166	*/
3f48242d	167	printf(cumode ? "Connected\r\n" : "\07connected\r\n");
5f50159a BJ	168	if (pid = fork())
	169	tipin();
	170	else
	171	tipout();
	172	/NOTREACHED/
	173	}
	174
5f50159a BJ	175	cleanup()
	176	{
	177	delock(uucplock);
f0211bf2 SL	178	#ifdef VMUNIX
	179	if (odisc)
	180	ioctl(0, TIOCSETD, (char *)&odisc);
	181	#endif
5f50159a BJ	182	exit(0);
	183	}
	184
	185	/*
	186	* put the controlling keyboard into raw mode
	187	*/
	188	raw()
	189	{
	190	ioctl(0, TIOCSETP, &arg);
	191	ioctl(0, TIOCSETC, &tchars);
c5d1037a	192	ioctl(0, TIOCSLTC, &ltchars);
4b675d70 SL	193	#ifdef VMUNIX
	194	ioctl(0, TIOCSETD, (char *)&disc);
	195	#endif
5f50159a BJ	196	}
	197
	198
	199	/*
	200	* return keyboard to normal mode
	201	*/
	202	unraw()
	203	{
4b675d70 SL	204	#ifdef VMUNIX
	205	ioctl(0, TIOCSETD, (char *)&odisc);
	206	#endif
	207	ioctl(0, TIOCSETP, (char *)&defarg);
	208	ioctl(0, TIOCSETC, (char *)&defchars);
c5d1037a	209	ioctl(0, TIOCSLTC, (char *)&deflchars);
5f50159a BJ	210	}
	211
	212	/*
	213	* Print string ``s'', then read a string
	214	* in from the terminal. Handles signals & allows use of
	215	* normal erase and kill characters.
	216	*/
	217	prompt(s, p)
	218	char *s;
	219	register char *p;
	220	{
	221	register char *b = p;
	222
	223	stoprompt = 0;
	224	signal(SIGINT, intprompt);
	225	signal(SIGQUIT, SIG_IGN);
	226	unraw();
	227	printf("%s", s);
	228	while ((p = getchar()) != EOF && p != '\n') {
	229	if (stoprompt)
	230	goto pbreak;
	231	p++;
	232	}
	233	*p = '\0';
	234	pbreak:
	235	raw();
	236	signal(SIGINT, SIG_DFL);
	237	signal(SIGQUIT,SIG_DFL);
	238	return(stoprompt \|\| p == b);
	239	}
	240
	241	/*
	242	* Interrupt service routine during prompting
	243	*/
	244	intprompt()
	245	{
	246	signal(SIGINT, SIG_IGN);
	247	stoprompt = 1;
	248	printf("\r\n");
	249	}
	250
	251	/*
	252	* **TIPIN TIPIN**
	253	*/
	254	tipin()
	255	{
	256	char gch, bol = 1;
	257
388a70dc SL	258	/*
	259	* Kinda klugey here...
	260	* check for scripting being turned on from the .tiprc file,
	261	* but be careful about just using setscript(), as we may
	262	* send a SIGEMT before tipout has a chance to set up catching
	263	* it; so wait a second, then setscript()
	264	*/
	265	if (boolean(value(SCRIPT))) {
	266	sleep(1);
	267	setscript();
	268	}
	269
5f50159a BJ	270	while (1) {
	271	gch = getchar()&0177;
	272	if ((gch == character(value(ESCAPE))) && bol) {
	273	if (!(gch = escape()))
	274	continue;
3f48242d	275	} else if (!cumode && gch == character(value(RAISECHAR))) {
5f50159a	276	boolean(value(RAISE)) = !boolean(value(RAISE));
5f50159a BJ	277	continue;
	278	} else if (gch == '\r') {
	279	bol = 1;
6b46907f RC	280	pwrite(FD, &gch, 1);
	281	if (boolean(value(HALFDUPLEX)))
	282	printf("\r\n");
5f50159a	283	continue;
3f48242d	284	} else if (!cumode && gch == character(value(FORCE)))
5f50159a	285	gch = getchar()&0177;
5f50159a BJ	286	bol = any(gch, value(EOL));
5f50159a BJ	287	if (boolean(value(RAISE)) && islower(gch))
6b46907f RC	288	gch = toupper(gch);
	289	pwrite(FD, &gch, 1);
	290	if (boolean(value(HALFDUPLEX)))
	291	printf("%c", gch);
5f50159a BJ	292	}
	293	}
	294
	295	/*
	296	* Escape handler --
	297	* called on recognition of ``escapec'' at the beginning of a line
	298	*/
	299	escape()
	300	{
	301	register char gch;
	302	register esctable_t *p;
	303	char c = character(value(ESCAPE));
	304	extern esctable_t etable[];
	305
	306	gch = (getchar()&0177);
	307	for (p = etable; p->e_char; p++)
	308	if (p->e_char == gch) {
	309	if ((p->e_flags&PRIV) && getuid())
	310	continue;
	311	printf("%s", ctrl(c));
	312	(*p->e_func)(gch);
	313	return(0);
	314	}
62f62be8 SL	315	/* ESCAPE ESCAPE forces ESCAPE */
62f62be8 SL	316	if (c != gch)
6b46907f	317	pwrite(FD, &c, 1);
5f50159a BJ	318	return(gch);
	319	}
	320
	321	speed(n)
	322	{
	323	register int *p;
	324
	325	for (p = bauds; *p != -1; p++)
	326	if (*p == n)
	327	return(p-bauds);
	328	return(NULL);
	329	}
	330
	331	any(c, p)
	332	register char c, *p;
	333	{
d080fb0b	334	if (p)
5f50159a BJ	335	while (*p)
	336	if (*p++ == c)
	337	return(1);
	338	return(0);
	339	}
	340
	341	size(s)
	342	register char *s;
	343	{
	344	register int i = 0;
	345
	346	while (*s++) i++;
	347	return(i);
	348	}
	349
	350	char *
	351	interp(s)
	352	register char *s;
	353	{
	354	static char buf[256];
	355	register char p = buf, c, q;
	356
	357	while (c = *s++) {
	358	for (q = "\nn\rr\tt\ff\033E\bb"; *q; q++)
	359	if (*q++ == c) {
	360	p++ = '\\'; p++ = *q;
	361	goto next;
	362	}
	363	if (c < 040) {
	364	p++ = '^'; p++ = c + 'A'-1;
	365	} else if (c == 0177) {
	366	p++ = '^'; p++ = '?';
	367	} else
	368	*p++ = c;
	369	next:
	370	;
	371	}
	372	*p = '\0';
	373	return(buf);
	374	}
	375
	376	char *
	377	ctrl(c)
	378	char c;
	379	{
	380	static char s[3];
	381
	382	if (c < 040 \|\| c == 0177) {
	383	s[0] = '^';
	384	s[1] = c == 0177 ? '?' : c+'A'-1;
	385	s[2] = '\0';
	386	} else {
	387	s[0] = c;
	388	s[1] = '\0';
	389	}
	390	return(s);
	391	}
	392
	393	/*
	394	* Help command
	395	*/
	396	help(c)
	397	char c;
	398	{
399	register esctable_t *p;
400	extern esctable_t etable[];
401
402	printf("%c\r\n", c);
403	for (p = etable; p->e_char; p++) {
404	if ((p->e_flags&PRIV) && getuid())
405	continue;
406	printf("%2s", ctrl(character(value(ESCAPE))));
407	printf("%-2s %c %s\r\n", ctrl(p->e_char),
408	p->e_flags&EXP ? '*': ' ', p->e_help);
409	}
410	}
4b675d70 SL	411
	412	/*
	413	* Set up the "remote" tty's state
	414	*/
4b675d70 SL	415	ttysetup(speed)
	416	{
	417	#ifdef VMUNIX
	418	unsigned bits = LDECCTQ;
	419	#endif
	420
	421	arg.sg_ispeed = arg.sg_ospeed = speed;
6b46907f RC	422	if (boolean(value(TAND)))
	423	arg.sg_flags = TANDEM\|RAW;
	424	else
	425	arg.sg_flags = RAW;
4b675d70 SL	426	ioctl(FD, TIOCSETP, (char *)&arg);
	427	#ifdef VMUNIX
	428	ioctl(FD, TIOCLBIS, (char *)&bits);
	429	#endif
	430	}
c731dacc BS	431
	432	/*
	433	* Return "simple" name from a file name,
	434	* strip leading directories.
	435	*/
	436	char *
	437	sname(s)
	438	register char *s;
	439	{
	440	register char *p = s;
	441
	442	while (*s)
	443	if (*s++ == '/')
	444	p = s;
	445	return (p);
	446	}
6b46907f RC	447
	448	extern char chartab[];
	449	static char partab[0200];
	450
	451	/*
	452	* do a write to the remote machine with the correct parity
	453	* we are doing 8 bit wide output, so we just generate a character
	454	* with the right parity and output it.
	455	*/
	456	pwrite(fd, buf, n)
	457	int fd;
	458	char *buf;
	459	register int n;
	460	{
	461	register int i;
	462	register char *bp = buf;
	463
	464	for (i = 0, bp = buf; i < n; i++, bp++) {
	465	bp = partab[(bp) & 0177];
	466	}
	467	write(fd, buf, n);
	468	}
	469
	470	/*
	471	* build a parity table with the right high-order bit
	472	* copy an even-parity table and doctor it
	473	*/
	474	setparity()
	475	{
	476	int i;
	477	char *parity;
	478
	479	if (value(PARITY) == NOSTR)
	480	value(PARITY) = "even";
	481
	482	parity = value(PARITY);
	483
	484	for (i = 0; i < 0200; i++)
	485	partab[i] = chartab[i];
	486
	487	if (equal(parity, "odd")) {
	488	for (i = 0; i < 0200; i++)
	489	partab[i] ^= 0200; /* reverse bit 7 */
	490	}
	491	else if (equal(parity, "none") \|\| equal(parity, "zero")) {
	492	for (i = 0; i < 0200; i++)
	493	partab[i] &= ~0200; /* turn off bit 7 */
	494	}
	495	else if (equal(parity, "one")) {
	496	for (i = 0; i < 0200; i++)
	497	partab[i] \|= 0200; /* turn on bit 7 */
	498	}
	499	else if (equal(parity, "even")) {
	500	/* table is already even parity */
	501	}
	502	else {
	503	fprintf(stderr, "parity value %s unknown\n", PA);
	504	fflush(stderr);
	505	}
	506	}