xref: /titanic_41/usr/src/lib/libnsl/dial/conn.c (revision d67944fbe3fa0b31893a7116a09b0718eecf6078)

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*	Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T	*/
/*	  All Rights Reserved	*/

/*
 * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#include "mt.h"
#include "uucp.h"
static char _ProtoSys[40];	/* protocol string from Systems file entry */
static char _ProtoDev[40];	/* protocol string from Devices file entry */
static char _ProtoCfg[];	/* protocol string from Config  file entry */

static jmp_buf Sjbuf;
static unsigned expecttime;

static int	Modemctrl;

static void alarmtr(int);
static void getProto(char *, char *);
static int finds(char *, char *[], int);
static int getto(char *[]);	/* make this static when ct uses altconn() */
static int chat(int, char *[], int, char *, char *);
static int rddev(char *, char *[], char *, int);
static int expect(char *, int);
static int wrstr(int, char *, int, int);
static int wrchr(int, char *, int);
static int processdev(char *[], char *[]);
static int getdevline(char *, int);
static int getsysline(char *, int);
static int sysaccess(int);
static int clear_hup(int);
#ifndef SMALL
static char *currsys(void);
static char *currdev(void);
#endif
static int wait_for_hangup(int);
static int expect_str(char *, int);

static void sendthem(char *, int, char *, char *);
static void nap(unsigned int);
static int notin(char *, char *);
static int ifdate(char *);
static int classmatch(char *[], char *[]);

static char *Myline = CNULL;	/* to force which line will be used */
static char *Mytype = CNULL;	/* to force selection of specific device type */

/*
 * conn - place a telephone call to system and login, etc.
 *
 * return codes:
 *	FAIL - connection failed
 *	>0  - file no.  -  connect ok
 * When a failure occurs, Uerror is set.
 */

static void sysreset(void);
static int
conn(char *system)
{
	int nf, fn = FAIL;
	char *flds[F_MAX+1];

	CDEBUG(4, "conn(%s)\n", system);
	Uerror = 0;
	while ((nf = finds(system, flds, F_MAX)) > 0) {
		fn = getto(flds);
		CDEBUG(4, "getto ret %d\n", fn);
		if (fn < 0)
			continue;
		if (EQUALS(Progname, "uucico")) {
			if (chat(nf - F_LOGIN, flds + F_LOGIN, fn, "", "") ==
			    SUCCESS) {
				sysreset();
				return (fn); /* successful return */
			}

			/* login failed */
			DEBUG(6, "close caller (%d)\n", fn);
			fd_rmlock(fn);
			(void) close(fn);
			if (Dc[0] != NULLCHAR) {
				/*EMPTY*/
				DEBUG(6, "delock line (%s)\n", Dc);
			}
		} else {
			sysreset();
			return (fn);
		}
	}

	/* finds or getto failed */
	sysreset();
	CDEBUG(1, "Call Failed: %s\n", UERRORTEXT);
	return (FAIL);
}

static void devreset(void);

/*
 * getto - connect to remote machine
 *
 * return codes:
 *	>0  -  file number - ok
 *	FAIL  -  failed
 */

static int
getto(char *flds[])
{
	char *dev[D_MAX+2], devbuf[BUFSIZ];
	int status;
	int dcf = -1;
	int reread = 0;
	int tries = 0;	/* count of call attempts - for limit purposes */

	CDEBUG(1, "Device Type %s wanted\n", flds[F_TYPE]);
	Uerror = 0;
	while (tries < TRYCALLS) {
		if ((status = rddev(flds[F_TYPE], dev, devbuf, D_MAX)) ==
		    FAIL) {
			if (tries == 0 || ++reread >= TRYCALLS)
				break;
			devreset();
			continue;
		}
		/* check class, check (and possibly set) speed */
		if (classmatch(flds, dev) != SUCCESS) {
			DEBUG(7, "Skipping entry in '%s'", currdev());
			DEBUG(7, " - class (%s) not wanted.\n", dev[D_CLASS]);
			continue;
		}
		DEBUG(5, "Trying device entry from '%s'.\n", currdev());
		if ((dcf = processdev(flds, dev)) >= 0)
			break;

		switch (Uerror) {
		case SS_CANT_ACCESS_DEVICE:
		case SS_DEVICE_FAILED:
		case SS_LOCKED_DEVICE:
			break;
		default:
			tries++;
			break;
		}
	}
	devreset();	/* reset devices file(s) */
	if (status == FAIL && !Uerror) {
		CDEBUG(1, "Requested Device Type Not Found\n%s", "");
		Uerror = SS_NO_DEVICE;
	}
	return (dcf);
}

/*
 * classmatch - process 'Any' in Devices and Systems and
 *	determine the correct speed, or match for ==
 */

static int
classmatch(char *flds[], char *dev[])
{
	/* check class, check (and possibly set) speed */
	if (EQUALS(flds[F_CLASS], "Any") && EQUALS(dev[D_CLASS], "Any")) {
		dev[D_CLASS] = DEFAULT_BAUDRATE;
		return (SUCCESS);
	} else if (EQUALS(dev[D_CLASS], "Any")) {
		dev[D_CLASS] = flds[F_CLASS];
		return (SUCCESS);
	} else if (EQUALS(flds[F_CLASS], "Any") ||
	    EQUALS(flds[F_CLASS], dev[D_CLASS]))
		return (SUCCESS);
	else
		return (FAIL);
}


/*
 *	rddev - find and unpack a line from device file for this caller type
 *	lines starting with whitespace of '#' are comments
 *
 *	return codes:
 *		>0  -  number of arguments in vector - succeeded
 *		FAIL - EOF
 */

static int
rddev(char *type, char *dev[], char *buf, int devcount)
{
	char *commap, d_type[BUFSIZ];
	int na;

	while (getdevline(buf, BUFSIZ)) {
		if (buf[0] == ' ' || buf[0] == '\t' || buf[0] == '\n' ||
		    buf[0] == '\0' || buf[0] == '#')
			continue;
		na = getargs(buf, dev, devcount);
		ASSERT(na >= D_CALLER, "BAD LINE", buf, na);

		if (strncmp(dev[D_LINE], "/dev/", 5) == 0) {
			/* since cu (altconn()) strips off leading */
			/* "/dev/",  do the same here.  */
			(void) strcpy(dev[D_LINE], &(dev[D_LINE][5]));
		}

		/* may have ",M" subfield in D_LINE */
		Modemctrl = FALSE;
		if ((commap = strchr(dev[D_LINE], ',')) != NULL) {
			if (strcmp(commap, ",M") == SAME)
				Modemctrl = TRUE;
			*commap = '\0';
		}

		/*
		 * D_TYPE field may have protocol subfield, which
		 * must be pulled off before comparing to desired type.
		 */
		(void) strcpy(d_type, dev[D_TYPE]);
		if ((commap = strchr(d_type, ',')) != NULL)
			*commap = '\0';

		/* to force the requested device type to be used. */
		if ((Mytype != NULL) && (!EQUALS(Mytype, d_type)))
			continue;
		/* to force the requested line to be used */
		if ((Myline != NULL) && (!EQUALS(Myline, dev[D_LINE])))
			continue;

		bsfix(dev);	/* replace \X fields */

		if (EQUALS(d_type, type)) {
			getProto(_ProtoDev, dev[D_TYPE]);
			return (na);
		}
	}
	return (FAIL);
}


/*
 * finds	- set system attribute vector
 *
 * input:
 *	fsys - open Systems file descriptor
 *	sysnam - system name to find
 * output:
 *	flds - attibute vector from Systems file
 *	fldcount - number of fields in flds
 * return codes:
 *	>0  -  number of arguments in vector - succeeded
 *	FAIL - failed
 * Uerror set:
 *	0 - found a line in Systems file
 *	SS_BADSYSTEM - no line found in Systems file
 *	SS_TIME_WRONG - wrong time to call
 */

static int
finds(char *sysnam, char *flds[], int fldcount)
{
	static char *info;	/* dynamically allocated BUFSIZ */
	int na;

	/*
	 * format of fields
	 *	0 name;
	 *	1 time
	 *	2 acu/hardwired
	 *	3 speed
	 *	etc
	 */

	if (sysnam == 0 || *sysnam == 0) {
		Uerror = SS_BADSYSTEM;
		return (FAIL);
	}

	if (info == NULL) {
		info = malloc(BUFSIZ);
		if (info == NULL) {
			DEBUG(1, "malloc failed for info in finds\n", 0);
			return (0);
		}
	}
	while (getsysline(info, BUFSIZ)) {
		na = getargs(info, flds, fldcount);
		bsfix(flds);	/* replace \X fields */
		if (!EQUALSN(sysnam, flds[F_NAME], MAXBASENAME))
			continue;
		/* check if requested Mytype device type */
		if ((Mytype != CNULL) &&
		    (!EQUALSN(flds[F_TYPE], Mytype, strlen(Mytype)))) {
			DEBUG(7, "Skipping entry in '%s'", currsys());
			DEBUG(7, " - type (%s) not wanted.\n", flds[F_TYPE]);
			continue;
		} else {
			/*EMPTY*/
			DEBUG(5, "Trying entry from '%s'", currsys());
			DEBUG(5, " - device type %s.\n", flds[F_TYPE]);
		}
		/* OK if not uucico (ie. ct or cu) or the time is right */
		if (!EQUALS(Progname, "uucico") || ifdate(flds[F_TIME])) {
			/*  found a good entry  */
			getProto(_ProtoSys, flds[F_TYPE]);
			Uerror = 0;
			return (na);	/* FOUND OK LINE */
		}
		CDEBUG(1, "Wrong Time To Call: %s\n", flds[F_TIME]);
		Uerror = SS_TIME_WRONG;
	}
	if (!Uerror)
		Uerror = SS_BADSYSTEM;
	return (FAIL);
}

/*
 * getProto - get the protocol letters from the input string.
 * input:
 *	str - string from Systems/Devices/Config file,
 *		a ',' delimits the protocol string
 *		e.g. ACU,g or DK,d
 * output:
 *	str - the , (if present) will be replaced with NULLCHAR
 *
 * return:  none
 */

static void
getProto(char *save, char *str)
{
	char *p;

	*save = NULLCHAR;
	if ((p = strchr(str, ',')) != NULL) {
		*p = NULLCHAR;
		(void) strcpy(save, p+1);
		DEBUG(7, "Protocol = %s\n", save);
	}
}

/*
 * chat -	do conversation
 * input:
 *	nf - number of fields in flds array
 *	flds - fields from Systems file
 *	fn - write file number
 *	phstr1 - phone number to replace \D
 *	phstr2 - phone number to replace \T
 *
 *	return codes:  0  |  FAIL
 */

static int
chat(int nf, char *flds[], int fn, char *phstr1, char *phstr2)
{
	char *want, *altern;
	int k, ok;

	for (k = 0; k < nf; k += 2) {
		want = flds[k];
		ok = FAIL;
		while (ok != 0) {
			altern = index(want, '-');
			if (altern != NULL)
				*altern++ = NULLCHAR;
			ok = expect(want, fn);
			if (ok == 0)
				break;
			if (altern == NULL) {
				Uerror = SS_LOGIN_FAILED;
				logent(UERRORTEXT, "FAILED");
				return (FAIL);
			}
			want = index(altern, '-');
			if (want != NULL)
				*want++ = NULLCHAR;
			sendthem(altern, fn, phstr1, phstr2);
		}
		(void) sleep(2);
		if (flds[k+1])
			sendthem(flds[k+1], fn, phstr1, phstr2);
	}
	return (0);
}

#define	MR 1000

/*
 *	expect(str, fn)	look for expected string w/ possible special chars
 *	char *str;
 *
 *	return codes:
 *		0  -  found
 *		FAIL  -  lost line or too many characters read
 *		some character  -  timed out
 */

static int
expect(char *str, int fn)
{
	char *bptr, *sptr;
	char    buf[BUFSIZ];

	bptr = buf;

	for (sptr = str; *sptr; sptr++) {
		if (*sptr == '\\') {
			switch (*++sptr) {
			case 'H':
				*bptr++ = '\0';
				if (expect_str(buf, fn) == FAIL) {
					return (FAIL);
				}
				if (wait_for_hangup(fn) == FAIL) {
					return (FAIL);
				}
				bptr = buf;
				continue;
			case '\\':
				*bptr++ = '\\';
				continue;
			default:
				*bptr++ = '\\';
				*bptr++ = *sptr;
				continue;
			}
		} else
			*bptr++ = *sptr;
	}
	*bptr = '\0';
	if (expect_str(buf, fn) == FAIL) {
		return (FAIL);
	}
	return (0);
}

/*
 *	expect_str(str, fn)	look for expected string, w/ no special chars
 *
 *	return codes:
 *		0  -  found
 *		FAIL  -  too many characters read
 *		some character  -  timed out
 */

static int
expect_str(char *str, int fn)
{
	static char rdvec[MR];
	char *rp = rdvec;
	int kr, c;
	char nextch;

	*rp = 0;

	CDEBUG(4, "expect: (%s", "");
	for (c = 0; (kr = str[c]) != 0; c++)
		if (kr < 040) {
			/*EMPTY*/
			CDEBUG(4, "^%c", kr | 0100);
		} else {
			/*EMPTY*/
			CDEBUG(4, "%c", kr);
		}
	CDEBUG(4, ")\n%s", "");

	if (EQUALS(str, "\"\"")) {
		CDEBUG(4, "got it\n%s", "");
		return (0);
	}
	if (*str == '\0')
		return (0);
	if (setjmp(Sjbuf))
		return (FAIL);
	(void) signal(SIGALRM, alarmtr);
	(void) alarm(expecttime);
	while (notin(str, rdvec)) {
		errno = 0;
		kr = (*Read)(fn, &nextch, 1);
		if (kr <= 0) {
			(void) alarm(0);
			CDEBUG(4, "lost line errno - %d\n", errno);
			logent("LOGIN", "LOST LINE");
			return (FAIL);
		}
		c = nextch & 0177;
		CDEBUG(4, "%s", c < 040 ? "^" : "");
		CDEBUG(4, "%c", c < 040 ? c | 0100 : c);
		if ((*rp = nextch & 0177) != NULLCHAR)
			rp++;
		if (rp >= rdvec + MR) {
			CDEBUG(4, "enough already\n%s", "");
			(void) alarm(0);
			return (FAIL);
		}
		*rp = NULLCHAR;
	}
	(void) alarm(0);
	CDEBUG(4, "got it\n%s", "");
	return (0);
}


/*
 *	alarmtr()  -  catch alarm routine for "expect".
 */
/*ARGSUSED*/
static void
alarmtr(int sig)
{
	CDEBUG(6, "timed out\n%s", "");
	longjmp(Sjbuf, 1);
}

/*
 *	wait_for_hangup() - wait for a hangup to occur on the given device
 */
int
wait_for_hangup(int dcf)
{
	int rval;
	char buff[BUFSIZ];

	CDEBUG(4, "Waiting for hangup\n%s", "");
	while ((rval = read(dcf, buff, BUFSIZ)) > 0)
		;

	if (rval < 0)
		return (FAIL);
	CDEBUG(4, "Received hangup\n%s", "");

	if (clear_hup(dcf) != SUCCESS) {
		CDEBUG(4, "Unable to clear hup on device\n%s", "");
		return (FAIL);
	}
	return (SUCCESS);
}

/*
 *	sendthem(str, fn, phstr1, phstr2)	send line of chat sequence
 *	char *str, *phstr;
 *
 *	return codes:  none
 */

#define	FLUSH() { \
	if ((bptr - buf) > 0) \
		if (wrstr(fn, buf, bptr - buf, echocheck) != SUCCESS) \
			goto err; \
	bptr = buf; \
}

static void
sendthem(char *str, int fn, char *phstr1, char *phstr2)
{
	int sendcr = 1, echocheck = 0;
	char	*sptr, *bptr;
	char	buf[BUFSIZ];
	struct termio	ttybuf;

	/* should be EQUALS, but previous versions had BREAK n for integer n */

	if (PREFIX("BREAK", str)) {
		/* send break */
		CDEBUG(5, "BREAK\n%s", "");
		(*genbrk)(fn);
		return;
	}

	if (EQUALS(str, "EOT")) {
		CDEBUG(5, "EOT\n%s", "");
		(void) (*Write)(fn, EOTMSG, strlen(EOTMSG));
		return;
	}

	if (EQUALS(str, "\"\"")) {
		CDEBUG(5, "\"\"\n%s", "");
		str += 2;
	}

	bptr = buf;
	CDEBUG(5, "sendthem (%s", "");
	for (sptr = str; *sptr; sptr++) {
		if (*sptr == '\\') {
			switch (*++sptr) {

			/* adjust switches */
			case 'c':	/* no CR after string */
				FLUSH();
				if (sptr[1] == NULLCHAR) {
					CDEBUG(5, "<NO CR>%s", "");
					sendcr = 0;
				} else {
					/*EMPTY*/
					CDEBUG(5, "<NO CR IGNORED>\n%s", "");
				}
				continue;
			}

			/* stash in buf and continue */
			switch (*sptr) {
			case 'D':	/* raw phnum */
				(void) strcpy(bptr, phstr1);
				bptr += strlen(bptr);
				continue;
			case 'T':	/* translated phnum */
				(void) strcpy(bptr, phstr2);
				bptr += strlen(bptr);
				continue;
			case 'N':	/* null */
				*bptr++ = 0;
				continue;
			case 's':	/* space */
				*bptr++ = ' ';
				continue;
			case '\\':	/* backslash escapes itself */
				*bptr++ = *sptr;
				continue;
			default:	/* send the backslash */
				*bptr++ = '\\';
				*bptr++ = *sptr;
				continue;

			/* flush buf, perform action, and continue */
			case 'E':	/* echo check on */
				FLUSH();
				CDEBUG(5, "ECHO CHECK ON\n%s", "");
				echocheck = 1;
				continue;
			case 'e':	/* echo check off */
				FLUSH();
				CDEBUG(5, "ECHO CHECK OFF\n%s", "");
				echocheck = 0;
				continue;
			case 'd':	/* sleep briefly */
				FLUSH();
				CDEBUG(5, "DELAY\n%s", "");
				(void) sleep(2);
				continue;
			case 'p':	/* pause momentarily */
				FLUSH();
				CDEBUG(5, "PAUSE\n%s", "");
				nap(HZ/4);	/* approximately 1/4 second */
				continue;
			case 'K':	/* inline break */
				FLUSH();
				CDEBUG(5, "BREAK\n%s", "");
				(*genbrk)(fn);
				continue;
			case 'M':	/* modem control - set CLOCAL */
			case 'm':	/* no modem control - clear CLOCAL */
				FLUSH();
				CDEBUG(5, ")\n%s CLOCAL ",
				    (*sptr == 'M' ? "set" : "clear"));
				if ((*Ioctl)(fn, TCGETA, &ttybuf) != 0) {
					/*EMPTY*/
					CDEBUG(5,
					    "ignored. TCGETA failed, errno %d",
					    errno);
				} else {
					if (*sptr == 'M')
					ttybuf.c_cflag |= CLOCAL;
					else
					ttybuf.c_cflag &= ~CLOCAL;
					if ((*Ioctl)(fn, TCSETAW, &ttybuf) != 0)
						/*EMPTY*/
					CDEBUG(5,
					    "failed. TCSETAW failed, errno %d",
					    errno);
				}
				CDEBUG(5, "\n%s", "");
				continue;
			}
		} else
			*bptr++ = *sptr;
	}
	if (sendcr)
		*bptr++ = '\r';
	if ((bptr - buf) > 0)
		(void) wrstr(fn, buf, bptr - buf, echocheck);

err:
	CDEBUG(5, ")\n%s", "");
}

#undef FLUSH

static int
wrstr(int fn, char *buf, int len, int echocheck)
{
	int	i;
	char dbuf[BUFSIZ], *dbptr = dbuf;

	buf[len] = 0;

	if (echocheck)
		return (wrchr(fn, buf, len));

	if (Debug >= 5) {
		if (sysaccess(ACCESS_SYSTEMS) == 0) {
			/* Systems file access ok */
			for (i = 0; i < len; i++) {
				*dbptr = buf[i];
				if (*dbptr < 040) {
					*dbptr++ = '^';
					*dbptr = buf[i] | 0100;
				}
				dbptr++;
			}
			*dbptr = 0;
		} else
			(void) strcpy(dbuf, "????????");
		CDEBUG(5, "%s", dbuf);
	}
	if ((*Write)(fn, buf, len) != len)
		return (FAIL);
	return (SUCCESS);
}

static int
wrchr(int fn, char *buf, int len)
{
	int	i, saccess;
	char	cin, cout;

	saccess = (sysaccess(ACCESS_SYSTEMS) == 0); /* protect Systems file */
	if (setjmp(Sjbuf))
		return (FAIL);
	(void) signal(SIGALRM, alarmtr);

	for (i = 0; i < len; i++) {
		cout = buf[i];
		if (saccess) {
			/*EMPTY*/
			CDEBUG(5, "%s", cout < 040 ? "^" : "");
			CDEBUG(5, "%c", cout < 040 ? cout | 0100 : cout);
		} else {
			/*EMPTY*/
			CDEBUG(5, "?%s", "");
		}
		if (((*Write)(fn, &cout, 1)) != 1)
			return (FAIL);
		do {
			(void) alarm(expecttime);
			if ((*Read)(fn, &cin, 1) != 1)
				return (FAIL);
			(void) alarm(0);
			cin &= 0177;
			if (saccess) {
				/*EMPTY*/
				CDEBUG(5, "%s", cin < 040 ? "^" : "");
				CDEBUG(5, "%c", cin < 040 ? cin | 0100 : cin);
			} else {
				/*EMPTY*/
				CDEBUG(5, "?%s", "");
			}
		} while (cout != (cin & 0177));
	}
	return (SUCCESS);
}


/*
 *	notin(sh, lg)	check for occurrence of substring "sh"
 *	char *sh, *lg;
 *
 *	return codes:
 *		0  -  found the string
 *		1  -  not in the string
 */

static int
notin(char *sh, char *lg)
{
	while (*lg != NULLCHAR) {
		if (PREFIX(sh, lg))
			return (0);
		else
			lg++;
	}
	return (1);
}


/*
 *	ifdate(s)
 *	char *s;
 *
 *	ifdate  -  this routine will check a string (s)
 *	like "MoTu0800-1730" to see if the present
 *	time is within the given limits.
 *	SIDE EFFECT - Retrytime is set to number following ";"
 *
 *	String alternatives:
 *		Wk - Mo thru Fr
 *		zero or one time means all day
 *		Any - any day
 *
 *	return codes:
 *		0  -  not within limits
 *		1  -  within limits
 */

static int
ifdate(char *s)
{
	static char *days[] = {
		"Su", "Mo", "Tu", "We", "Th", "Fr", "Sa", 0
	};
	time_t	clock;
	int	t__now;
	char	*p;
	struct tm	*tp;

	(void) time(&clock);
	tp = localtime(&clock);
	t__now = tp->tm_hour * 100 + tp->tm_min;	/* "navy" time */

	/*
	 *	pick up retry time for failures
	 *	global variable Retrytime is set here
	 */
	if ((p = rindex(s, ';')) != NULL)
		if (isdigit(p[1])) {
		if (sscanf(p+1, "%ld", &Retrytime) < 1)
			Retrytime = 5;	/* 5 minutes is error default */
		Retrytime  *= 60;
		*p = NULLCHAR;
		}

	while (*s) {
		int	i, dayok;

		for (dayok = 0; (!dayok) && isalpha(*s); s++) {
			if (PREFIX("Any", s))
				dayok = 1;
			else if (PREFIX("Wk", s)) {
				if (tp->tm_wday >= 1 && tp->tm_wday <= 5)
					dayok = 1;
			} else
				for (i = 0; days[i]; i++)
					if (PREFIX(days[i], s))
						if (tp->tm_wday == i)
							dayok = 1;
		}

		if (dayok) {
			int	t__low, t__high;

			while (isalpha(*s))	/* flush remaining day stuff */
				s++;

			if ((sscanf(s, "%d-%d", &t__low, &t__high) < 2) ||
			    (t__low == t__high))
				return (1);

			/* 0000 crossover? */
			if (t__low < t__high) {
				if (t__low <= t__now && t__now <= t__high)
					return (1);
			} else if (t__low <= t__now || t__now <= t__high)
				return (1);

			/* aim at next time slot */
			if ((s = index(s, ',')) == NULL)
				break;
		}
		if (*s)
			s++;
	}
	return (0);
}

/*
 *	char *
 *	fdig(cp)	find first digit in string
 *
 *	return - pointer to first digit in string or end of string
 */

static char *
fdig(char *cp)
{
	char *c;

	for (c = cp; *c; c++)
		if (*c >= '0' && *c <= '9')
			break;
	return (c);
}

	/* nap(n) -- sleep for 'n' ticks of 1/60th sec each. */
	/* This version uses the select system call */


static void
nap(unsigned int n)
{
	struct timeval tv;

	if (n == 0)
		return;
	tv.tv_sec = n/60;
	tv.tv_usec = ((n%60)*1000000L)/60;
	(void) select(32, 0, 0, 0, &tv);
}