usr/src/usr.bin/tip/tip.c

#ifndef lint
static char sccsid[] = "@(#)tip.c	4.16 (Berkeley) %G%";
#endif

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

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

int	disc = OTTYDISC;		/* tip normally runs this way */
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("even");			/* 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);
	ioctl(0, TIOCGETD, (char *)&odisc);
	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);
	if (odisc)
		ioctl(0, TIOCSETD, (char *)&odisc);
	exit(0);
}

/*
 * put the controlling keyboard into raw mode
 */
raw()
{

	ioctl(0, TIOCSETP, &arg);
	ioctl(0, TIOCSETC, &tchars);
	ioctl(0, TIOCSLTC, &ltchars);
	ioctl(0, TIOCSETD, (char *)&disc);
}


/*
 * return keyboard to normal mode
 */
unraw()
{

	ioctl(0, TIOCSETD, (char *)&odisc);
	ioctl(0, TIOCSETP, (char *)&defarg);
	ioctl(0, TIOCSETC, (char *)&defchars);
	ioctl(0, TIOCSLTC, (char *)&deflchars);
}

static	jmp_buf promptbuf;

/*
 * 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;
	int (*oint)(), (*oquit)();

	stoprompt = 0;
	oint = signal(SIGINT, intprompt);
	oint = signal(SIGQUIT, SIG_IGN);
	unraw();
	printf("%s", s);
	if (setjmp(promptbuf) == 0)
		while ((*p = getchar()) != EOF && *p != '\n')
			p++;
	*p = '\0';

	raw();
	signal(SIGINT, oint);
	signal(SIGQUIT, oint);
	return (stoprompt || p == b);
}

/*
 * Interrupt service routine during prompting
 */
intprompt()
{

	signal(SIGINT, SIG_IGN);
	stoprompt = 1;
	printf("\r\n");
	longjmp(promptbuf, 1);
}

/*
 * ****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)
	int 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;
{
	while (p && *p)
		if (*p++ == c)
			return (1);
	return (0);
}

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

	while (s && *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)
	int speed;
{
	unsigned bits = LDECCTQ;

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

/*
 * 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);
}

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;

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

/*
 * Build a parity table with appropriate high-order bit.
 */
setparity(defparity)
	char *defparity;
{
	register int i;
	char *parity;
	extern char evenpartab[];

	if (value(PARITY) == NOSTR)
		value(PARITY) = defparity;
	parity = value(PARITY);
	for (i = 0; i < 0200; i++)
		partab[i] = evenpartab[i];
	if (equal(parity, "even"))
		return;
	if (equal(parity, "odd")) {
		for (i = 0; i < 0200; i++)
			partab[i] ^= 0200;	/* reverse bit 7 */
		return;
	}
	if (equal(parity, "none") || equal(parity, "zero")) {
		for (i = 0; i < 0200; i++)
			partab[i] &= ~0200;	/* turn off bit 7 */
		return;
	}
	if (equal(parity, "one")) {
		for (i = 0; i < 0200; i++)
			partab[i] |= 0200;	/* turn on bit 7 */
		return;
	}
	fprintf(stderr, "%s: unknown parity value\n", PA);
	fflush(stderr);
}
Commit	Line	Data
	1	#ifndef lint
	2	static char sccsid[] = "@(#)tip.c 4.16 (Berkeley) %G%";
	3	#endif
	4
	5	/*
	6	* tip - UNIX link to other systems
	7	* tip [-v] [-speed] system-name
	8	* or
	9	* cu phone-number [-s speed] [-l line] [-a acu]
	10	*/
	11	#include "tip.h"
	12
	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
	21	int disc = OTTYDISC; /* tip normally runs this way */
	22	int intprompt();
	23	int timeout();
	24	int cleanup();
	25	char *sname();
	26	extern char *sprintf();
	27
	28	main(argc, argv)
	29	char *argv[];
	30	{
	31	char *system = NOSTR;
	32	register int i;
	33	register char *p;
	34	char sbuf[12];
	35
	36	if (equal(sname(argv[0]), "cu")) {
	37	cumain(argc, argv);
	38	cumode = 1;
	39	goto cucommon;
	40	}
	41
	42	if (argc > 4) {
	43	fprintf(stderr, "usage: tip [-v] [-speed] [system-name]\n");
	44	exit(1);
	45	}
	46	if (!isatty(0)) {
	47	fprintf(stderr, "tip: must be interactive\n");
	48	exit(1);
	49	}
	50
	51	for (; argc > 1; argv++, argc--) {
	52	if (argv[1][0] != '-')
	53	system = argv[1];
	54	else switch (argv[1][1]) {
	55
	56	case 'v':
	57	vflag++;
	58	break;
	59
	60	case '0': case '1': case '2': case '3': case '4':
	61	case '5': case '6': case '7': case '8': case '9':
	62	BR = atoi(&argv[1][1]);
	63	break;
	64
	65	default:
	66	fprintf(stderr, "tip: %s, unknown option\n", argv[1]);
	67	break;
	68	}
	69	}
	70
	71	if (system == NOSTR)
	72	goto notnumber;
	73	for (p = system; *p; p++)
	74	if (isalpha(*p))
	75	goto notnumber;
	76	PN = system; /* system name is really a phone number */
	77	system = sprintf(sbuf, "tip%d", BR);
	78
	79	notnumber:
	80	signal(SIGINT, cleanup);
	81	signal(SIGQUIT, cleanup);
	82	signal(SIGHUP, cleanup);
	83	signal(SIGTERM, cleanup);
	84
	85	if ((i = hunt(system)) == 0) {
	86	printf("all ports busy\n");
	87	exit(3);
	88	}
	89	if (i == -1) {
	90	printf("link down\n");
	91	delock(uucplock);
	92	exit(3);
	93	}
	94	setbuf(stdout, NULL);
	95	loginit();
	96	/*
	97	* Now that we have the logfile and the ACU open
	98	* return to the real uid and gid. These things will
	99	* be closed on exit. Note that we can't run as root,
	100	* because locking mechanism on the tty and the accounting
	101	* will be bypassed.
	102	*/
	103	setgid(getgid());
	104	setuid(getuid());
	105
	106	/*
	107	* Kludge, their's no easy way to get the initialization
	108	* in the right order, so force it here
	109	*/
	110	if ((PH = getenv("PHONES")) == NOSTR)
	111	PH = "/etc/phones";
	112	vinit(); /* init variables */
	113	setparity("even"); /* set the parity table */
	114	if ((i = speed(number(value(BAUDRATE)))) == NULL) {
	115	printf("tip: bad baud rate %d\n", number(value(BAUDRATE)));
	116	delock(uucplock);
	117	exit(3);
	118	}
	119
	120	/*
	121	* Hardwired connections require the
	122	* line speed set before they make any transmissions
	123	* (this is particularly true of things like a DF03-AC)
	124	*/
	125	if (HW)
	126	ttysetup(i);
	127	if (p = connect()) {
	128	printf("\07%s\n[EOT]\n", p);
	129	delock(uucplock);
	130	exit(1);
	131	}
	132	if (!HW)
	133	ttysetup(i);
	134	cucommon:
	135	/*
	136	* From here down the code is shared with
	137	* the "cu" version of tip.
	138	*/
	139	ioctl(0, TIOCGETP, (char *)&defarg);
	140	ioctl(0, TIOCGETC, (char *)&defchars);
	141	ioctl(0, TIOCGLTC, (char *)&deflchars);
	142	ioctl(0, TIOCGETD, (char *)&odisc);
	143	arg = defarg;
	144	arg.sg_flags = ANYP \| CBREAK;
	145	tchars = defchars;
	146	tchars.t_intrc = tchars.t_quitc = -1;
	147	ltchars = deflchars;
	148	ltchars.t_suspc = ltchars.t_dsuspc = ltchars.t_flushc
	149	= ltchars.t_lnextc = -1;
	150	raw();
	151
	152	pipe(fildes); pipe(repdes);
	153	signal(SIGALRM, timeout);
	154
	155	/*
	156	* Everything's set up now:
	157	* connection established (hardwired or diaulup)
	158	* line conditioned (baud rate, mode, etc.)
	159	* internal data structures (variables)
	160	* so, fork one process for local side and one for remote.
	161	*/
	162	printf(cumode ? "Connected\r\n" : "\07connected\r\n");
	163	if (pid = fork())
	164	tipin();
	165	else
	166	tipout();
	167	/NOTREACHED/
	168	}
	169
	170	cleanup()
	171	{
	172
	173	delock(uucplock);
	174	if (odisc)
	175	ioctl(0, TIOCSETD, (char *)&odisc);
	176	exit(0);
	177	}
	178
	179	/*
	180	* put the controlling keyboard into raw mode
	181	*/
	182	raw()
	183	{
	184
	185	ioctl(0, TIOCSETP, &arg);
	186	ioctl(0, TIOCSETC, &tchars);
	187	ioctl(0, TIOCSLTC, &ltchars);
	188	ioctl(0, TIOCSETD, (char *)&disc);
	189	}
	190
	191
	192	/*
	193	* return keyboard to normal mode
	194	*/
	195	unraw()
	196	{
	197
	198	ioctl(0, TIOCSETD, (char *)&odisc);
	199	ioctl(0, TIOCSETP, (char *)&defarg);
	200	ioctl(0, TIOCSETC, (char *)&defchars);
	201	ioctl(0, TIOCSLTC, (char *)&deflchars);
	202	}
	203
	204	static jmp_buf promptbuf;
	205
	206	/*
	207	* Print string ``s'', then read a string
	208	* in from the terminal. Handles signals & allows use of
	209	* normal erase and kill characters.
	210	*/
	211	prompt(s, p)
	212	char *s;
	213	register char *p;
	214	{
	215	register char *b = p;
	216	int (oint)(), (oquit)();
	217
	218	stoprompt = 0;
	219	oint = signal(SIGINT, intprompt);
	220	oint = signal(SIGQUIT, SIG_IGN);
	221	unraw();
	222	printf("%s", s);
	223	if (setjmp(promptbuf) == 0)
	224	while ((p = getchar()) != EOF && p != '\n')
	225	p++;
	226	*p = '\0';
	227
	228	raw();
	229	signal(SIGINT, oint);
	230	signal(SIGQUIT, oint);
	231	return (stoprompt \|\| p == b);
	232	}
	233
	234	/*
	235	* Interrupt service routine during prompting
	236	*/
	237	intprompt()
	238	{
	239
	240	signal(SIGINT, SIG_IGN);
	241	stoprompt = 1;
	242	printf("\r\n");
	243	longjmp(promptbuf, 1);
	244	}
	245
	246	/*
	247	* **TIPIN TIPIN**
	248	*/
	249	tipin()
	250	{
	251	char gch, bol = 1;
	252
	253	/*
	254	* Kinda klugey here...
	255	* check for scripting being turned on from the .tiprc file,
	256	* but be careful about just using setscript(), as we may
	257	* send a SIGEMT before tipout has a chance to set up catching
	258	* it; so wait a second, then setscript()
	259	*/
	260	if (boolean(value(SCRIPT))) {
	261	sleep(1);
	262	setscript();
	263	}
	264
	265	while (1) {
	266	gch = getchar()&0177;
	267	if ((gch == character(value(ESCAPE))) && bol) {
	268	if (!(gch = escape()))
	269	continue;
	270	} else if (!cumode && gch == character(value(RAISECHAR))) {
	271	boolean(value(RAISE)) = !boolean(value(RAISE));
	272	continue;
	273	} else if (gch == '\r') {
	274	bol = 1;
	275	pwrite(FD, &gch, 1);
	276	if (boolean(value(HALFDUPLEX)))
	277	printf("\r\n");
	278	continue;
	279	} else if (!cumode && gch == character(value(FORCE)))
	280	gch = getchar()&0177;
	281	bol = any(gch, value(EOL));
	282	if (boolean(value(RAISE)) && islower(gch))
	283	gch = toupper(gch);
	284	pwrite(FD, &gch, 1);
	285	if (boolean(value(HALFDUPLEX)))
	286	printf("%c", gch);
	287	}
	288	}
	289
	290	/*
	291	* Escape handler --
	292	* called on recognition of ``escapec'' at the beginning of a line
	293	*/
	294	escape()
	295	{
	296	register char gch;
	297	register esctable_t *p;
	298	char c = character(value(ESCAPE));
	299	extern esctable_t etable[];
	300
	301	gch = (getchar()&0177);
	302	for (p = etable; p->e_char; p++)
	303	if (p->e_char == gch) {
	304	if ((p->e_flags&PRIV) && getuid())
	305	continue;
	306	printf("%s", ctrl(c));
	307	(*p->e_func)(gch);
	308	return (0);
	309	}
	310	/* ESCAPE ESCAPE forces ESCAPE */
	311	if (c != gch)
	312	pwrite(FD, &c, 1);
	313	return (gch);
	314	}
	315
	316	speed(n)
	317	int n;
	318	{
	319	register int *p;
	320
	321	for (p = bauds; *p != -1; p++)
	322	if (*p == n)
	323	return (p - bauds);
	324	return (NULL);
	325	}
	326
	327	any(c, p)
	328	register char c, *p;
	329	{
	330	while (p && *p)
	331	if (*p++ == c)
	332	return (1);
	333	return (0);
	334	}
	335
	336	size(s)
	337	register char *s;
	338	{
	339	register int i = 0;
	340
	341	while (s && *s++)
	342	i++;
	343	return (i);
	344	}
	345
	346	char *
	347	interp(s)
	348	register char *s;
	349	{
	350	static char buf[256];
	351	register char p = buf, c, q;
	352
	353	while (c = *s++) {
	354	for (q = "\nn\rr\tt\ff\033E\bb"; *q; q++)
	355	if (*q++ == c) {
	356	p++ = '\\'; p++ = *q;
	357	goto next;
	358	}
	359	if (c < 040) {
	360	p++ = '^'; p++ = c + 'A'-1;
	361	} else if (c == 0177) {
	362	p++ = '^'; p++ = '?';
	363	} else
	364	*p++ = c;
	365	next:
	366	;
	367	}
	368	*p = '\0';
	369	return (buf);
	370	}
	371
	372	char *
	373	ctrl(c)
	374	char c;
	375	{
	376	static char s[3];
	377
	378	if (c < 040 \|\| c == 0177) {
	379	s[0] = '^';
	380	s[1] = c == 0177 ? '?' : c+'A'-1;
	381	s[2] = '\0';
	382	} else {
	383	s[0] = c;
	384	s[1] = '\0';
	385	}
	386	return (s);
	387	}
	388
	389	/*
	390	* Help command
	391	*/
	392	help(c)
	393	char c;
	394	{
	395	register esctable_t *p;
	396	extern esctable_t etable[];
	397
	398	printf("%c\r\n", c);
	399	for (p = etable; p->e_char; p++) {
	400	if ((p->e_flags&PRIV) && getuid())
	401	continue;
	402	printf("%2s", ctrl(character(value(ESCAPE))));
	403	printf("%-2s %c %s\r\n", ctrl(p->e_char),
	404	p->e_flags&EXP ? '*': ' ', p->e_help);
	405	}
	406	}
	407
	408	/*
	409	* Set up the "remote" tty's state
	410	*/
	411	ttysetup(speed)
	412	int speed;
	413	{
	414	unsigned bits = LDECCTQ;
	415
	416	arg.sg_ispeed = arg.sg_ospeed = speed;
	417	arg.sg_flags = RAW;
	418	if (boolean(value(TAND)))
	419	arg.sg_flags \|= TANDEM;
	420	ioctl(FD, TIOCSETP, (char *)&arg);
	421	ioctl(FD, TIOCLBIS, (char *)&bits);
	422	}
	423
	424	/*
	425	* Return "simple" name from a file name,
	426	* strip leading directories.
	427	*/
	428	char *
	429	sname(s)
	430	register char *s;
	431	{
	432	register char *p = s;
	433
	434	while (*s)
	435	if (*s++ == '/')
	436	p = s;
	437	return (p);
	438	}
	439
	440	static char partab[0200];
	441
	442	/*
	443	* Do a write to the remote machine with the correct parity.
	444	* We are doing 8 bit wide output, so we just generate a character
	445	* with the right parity and output it.
	446	*/
	447	pwrite(fd, buf, n)
	448	int fd;
	449	char *buf;
	450	register int n;
	451	{
	452	register int i;
	453	register char *bp;
	454
	455	bp = buf;
	456	for (i = 0; i < n; i++) {
	457	bp = partab[(bp) & 0177];
	458	bp++;
	459	}
	460	write(fd, buf, n);
	461	}
	462
	463	/*
	464	* Build a parity table with appropriate high-order bit.
	465	*/
	466	setparity(defparity)
	467	char *defparity;
	468	{
	469	register int i;
	470	char *parity;
	471	extern char evenpartab[];
	472
	473	if (value(PARITY) == NOSTR)
	474	value(PARITY) = defparity;
	475	parity = value(PARITY);
	476	for (i = 0; i < 0200; i++)
	477	partab[i] = evenpartab[i];
	478	if (equal(parity, "even"))
	479	return;
	480	if (equal(parity, "odd")) {
	481	for (i = 0; i < 0200; i++)
	482	partab[i] ^= 0200; /* reverse bit 7 */
	483	return;
	484	}
	485	if (equal(parity, "none") \|\| equal(parity, "zero")) {
	486	for (i = 0; i < 0200; i++)
	487	partab[i] &= ~0200; /* turn off bit 7 */
	488	return;
	489	}
	490	if (equal(parity, "one")) {
	491	for (i = 0; i < 0200; i++)
	492	partab[i] \|= 0200; /* turn on bit 7 */
	493	return;
	494	}
	495	fprintf(stderr, "%s: unknown parity value\n", PA);
	496	fflush(stderr);
	497	}