xref: /csrg-svn/usr.bin/tip/aculib/biz31.c (revision 3687)

/*	biz31.c	4.1	81/05/09	*/
#include "tip.h"

#if BIZCOMP
#define MAXRETRY	3		/* sync up retry count */
#define DISCONNECT	"\21\25\11\24"	/* disconnection string */

static int sigALRM();
static int timeout = 0;

/*
 * Dial up on a BIZCOMP with either
 * 	tone dialing (mod = "f")
 *	pulse dialing (mod = "w")
 */
static int
biz_dialer(num, mod)
char *num, *mod;
{
	register int connected = 0;

	if (!bizsync(FD)) {
		logent(value(HOST), "", "biz", "out of sync");
		printf("bizcomp out of sync\n");
		delock(uucplock);
		exit(0);
	}
	if (boolean(value(VERBOSE)))
		printf("\nstarting call...");
	echo("#\rk$\r$\n");			/* disable auto-answer */
	echo("$>$.$ #\r");			/* tone/pulse dialing */
	echo(mod);
	echo("$\r$\n");
	echo("$>$.$ #\re$ ");			/* disconnection sequence */
	echo(DISCONNECT);
	echo("\r$\n$\r$\n");
	echo("$>$.$ #\rr$ ");			/* repeat dial */
	echo(num);
	echo("\r$\n");
	if (boolean(value(VERBOSE)))
		printf("ringing...");
	/*
	 * The reply from the BIZCOMP should be:
	 *	`^G NO CONNECTION\r\n^G\r\n'	failure
	 *	` CONNECTION\r\n^G'		success
	 */
	connected = detect(" ");
#ifdef ACULOG
	if (timeout) {
		char line[80];

		sprintf(line, "%d second dial timeout",
			number(value(DIALTIMEOUT)));
		logent(value(HOST), num, "biz", line);
	}
#endif
	if (!connected)
		flush(" NO CONNECTION\r\n\07\r\n");
	else
		flush("CONNECTION\r\n\07");
	if (timeout)
		biz_disconnect();	/* insurance */
	return(connected);
}

bizw_dialer(num, acu)
char *num, *acu;
{
	return(biz_dialer(num, "w"));
}

bizf_dialer(num, acu)
char *num, *acu;
{
	return(biz_dialer(num, "f"));
}

biz_disconnect()
{
	write(FD, DISCONNECT, 4);
	sleep(2);
	ioctl(FD, TIOCFLUSH);
}

biz_abort()
{
	write(FD, "\33", 1);
	timeout = 1;
}

static int
echo(s)
register char *s;
{
	char c;

	while (c = *s++)
		switch(c)
		{
			case '$':
				read(FD, &c, 1);
				s++;
				break;
			case '#':
				c = *s++;
				write(FD, &c, 1);
				break;
			default:
				write(FD, &c, 1);
				read(FD, &c, 1);
		}
}

static int
sigALRM()
{
	signal(SIGALRM, SIG_IGN);
	printf("\07timeout waiting for reply\n");
	timeout = 1;
}

static int
detect(s)
register char *s;
{
	char c;

	signal(SIGALRM, biz_abort);
	timeout = 0;
	while (*s)
	{
		alarm(number(value(DIALTIMEOUT)));
		read(FD, &c, 1);
		alarm(0);
		if (timeout)
			return(0);
		if (c != *s++)
			return(0);
	}
	signal(SIGALRM, SIG_DFL);
	return(1);
}

static int
flush(s)
register char *s;
{
	char c;

	signal(SIGALRM, sigALRM);
	timeout = 0;
	while (*s++)
	{
		alarm(10);
		read(FD, &c, 1);
		alarm(0);
		if (timeout)
			break;
	}
	signal(SIGALRM, SIG_DFL);
	timeout = 0;			/* guard against disconnection */
	return(1);
}

/*
 * This convoluted piece of code attempts to get
 *  the bizcomp in sync.  If you don't have the capacity or nread
 *  call there are gory ways to simulate this.
 */
static int
bizsync(fd)
{
#ifdef FIOCAPACITY
	struct capacity b;
#	define chars(b)	((b).cp_nbytes)
#	define IOCTL	FIOCAPACITY
#endif
#ifdef FIONREAD
	long b;
#	define chars(b)	(b)
#	define IOCTL	FIONREAD
#endif
	register int already = 0;
	char buf[10];

retry:
	if (ioctl(fd, IOCTL, (caddr_t)&b) >= 0 && chars(b) > 0)
		ioctl(fd, TIOCFLUSH);
	write(fd, "\rp>\r", 4);
	sleep(1);
	if (ioctl(fd, IOCTL, (caddr_t)&b) >= 0) {
		if (chars(b) != 10) {
	nono:
			if (already > MAXRETRY)
				return(0);
			write(fd, DISCONNECT, 4);
			sleep(2);
			already++;
			goto retry;
		} else {
			read(fd, buf, 10);
			if (strncmp(buf, "p >\r\n\r\n>", 8))
				goto nono;
		}
	}
	return(1);
}
#endif