sz.c

DOS下采用中断接收数据的串口通讯的例子,很难找到的好东西!

	q = (char *) 0;
	if (Dottoslash) {		/* change . to . */
		for (p=name; *p; ++p) {
			if (*p == '/')
				q = p;
			else if (*p == '.')
				*(q=p) = '/';
		}
		if (q && strlen(++q) > 8) {	/* If name>8 chars */
			q += 8;			/*   make it .ext */
			strcpy(name2, q);	/* save excess of name */
			*q = '.';
			strcpy(++q, name2);	/* add it back */
		}
	}

	for (p=name, q=txbuf ; *p; )
		if ((*q++ = *p++) == '/' && !Fullname)
			q = txbuf;
	*q++ = 0;
	p=q;
	while (q < (txbuf + 1024))
		*q++ = 0;
	if (!Ascii && (in!=stdin) && *name && fstat(fileno(in), &f)!= -1)
		sprintf(p, "%lu %lo %o 0 %d %ld", f.st_size, f.st_mtime,
		  f.st_mode, Filesleft, Totalleft);
	Totalleft -= f.st_size;
	if (--Filesleft <= 0)
		Totalleft = 0;
	if (Totalleft < 0)
		Totalleft = 0;

	/* force 1k blocks if name won't fit in 128 byte block */
	if (txbuf[125])
		blklen=1024;
	else {		/* A little goodie for IMP/KMD */
		txbuf[127] = (f.st_size + 127) >>7;
		txbuf[126] = (f.st_size + 127) >>15;
	}
	if (Zmodem)
		return zsendfile(txbuf, 1+strlen(p)+(p-txbuf));
	if (wcputsec(txbuf, 0, 128)==ERROR)
		return ERROR;
	return OK;
}

getnak()
{
	register firstch;

	Lastrx = 0;
	for (;;) {
		switch (firstch = readock(800,1)) {
		case ZPAD:
			if (getzrxinit())
				return ERROR;
			Ascii = 0;	/* Receiver does the conversion */
			return FALSE;
		case TIMEOUT:
			zperr("Timeout on pathname");
			return TRUE;
		case WANTG:
#ifdef MODE2OK
			mode(2);	/* Set cbreak, XON/XOFF, etc. */
#endif
			Optiong = TRUE;
			blklen=1024;
		case WANTCRC:
			Crcflg = TRUE;
		case NAK:
			return FALSE;
		case CAN:
			if ((firstch = readock(20,1)) == CAN && Lastrx == CAN)
				return TRUE;
		default:
			break;
		}
		Lastrx = firstch;
	}
}


wctx(flen)
long flen;
{
	register int thisblklen;
	register int sectnum, attempts, firstch;
	long charssent;

	charssent = 0;  firstsec=TRUE;  thisblklen = blklen;
	vfile("wctx:file length=%ld", flen);

	while ((firstch=readock(Rxtimeout, 2))!=NAK && firstch != WANTCRC
	  && firstch != WANTG && firstch!=TIMEOUT && firstch!=CAN)
		;
	if (firstch==CAN) {
		zperr("Receiver CANcelled");
		return ERROR;
	}
	if (firstch==WANTCRC)
		Crcflg=TRUE;
	if (firstch==WANTG)
		Crcflg=TRUE;
	sectnum=0;
	for (;;) {
		if (flen <= (charssent + 896L))
			thisblklen = 128;
		if ( !filbuf(txbuf, thisblklen))
			break;
		if (wcputsec(txbuf, ++sectnum, thisblklen)==ERROR)
			return ERROR;
		charssent += thisblklen;
	}
	fclose(in);
	attempts=0;
	do {
		purgeline();
		sendline(EOT);
		fflush(stdout);
		++attempts;
	}
		while ((firstch=(readock(Rxtimeout, 1)) != ACK) && attempts < RETRYMAX);
	if (attempts == RETRYMAX) {
		zperr("No ACK on EOT");
		return ERROR;
	}
	else
		return OK;
}

wcputsec(buf, sectnum, cseclen)
char *buf;
int sectnum;
int cseclen;	/* data length of this sector to send */
{
	register checksum, wcj;
	register char *cp;
	unsigned oldcrc;
	int firstch;
	int attempts;

	firstch=0;	/* part of logic to detect CAN CAN */

	if (Verbose>2)
		fprintf(stderr, "Sector %3d %2dk\n", Totsecs, Totsecs/8 );
	else if (Verbose>1)
		fprintf(stderr, "\rSector %3d %2dk ", Totsecs, Totsecs/8 );
	for (attempts=0; attempts <= RETRYMAX; attempts++) {
		Lastrx= firstch;
		sendline(cseclen==1024?STX:SOH);
		sendline(sectnum);
		sendline(-sectnum -1);
		oldcrc=checksum=0;
		for (wcj=cseclen,cp=buf; --wcj>=0; ) {
			sendline(*cp);
			oldcrc=updcrc((0377& *cp), oldcrc);
			checksum += *cp++;
		}
		if (Crcflg) {
			oldcrc=updcrc(0,updcrc(0,oldcrc));
			sendline((int)oldcrc>>8);
			sendline((int)oldcrc);
		}
		else
			sendline(checksum);

		if (Optiong) {
			firstsec = FALSE; return OK;
		}
		firstch = readock(Rxtimeout, (Noeofseen&&sectnum) ? 2:1);
gotnak:
		switch (firstch) {
		case CAN:
			if(Lastrx == CAN) {
cancan:
				zperr("Cancelled");  return ERROR;
			}
			break;
		case TIMEOUT:
			zperr("Timeout on sector ACK"); continue;
		case WANTCRC:
			if (firstsec)
				Crcflg = TRUE;
		case NAK:
			zperr("NAK on sector"); continue;
		case ACK: 
			firstsec=FALSE;
			Totsecs += (cseclen>>7);
			return OK;
		case ERROR:
			zperr("Got burst for sector ACK"); break;
		default:
			zperr("Got %02x for sector ACK", firstch); break;
		}
		for (;;) {
			Lastrx = firstch;
			if ((firstch = readock(Rxtimeout, 2)) == TIMEOUT)
				break;
			if (firstch == NAK || firstch == WANTCRC)
				goto gotnak;
			if (firstch == CAN && Lastrx == CAN)
				goto cancan;
		}
	}
	zperr("Retry Count Exceeded");
	return ERROR;
}

/* fill buf with count chars padding with ^Z for CPM */
filbuf(buf, count)
register char *buf;
{
	register c, m;

	if ( !Ascii) {
		m = read(fileno(in), buf, count);
		if (m <= 0)
			return 0;
		while (m < count)
			buf[m++] = 032;
		return count;
	}
	m=count;
	if (Lfseen) {
		*buf++ = 012; --m; Lfseen = 0;
	}
	while ((c=getc(in))!=EOF) {
		if (c == 012) {
			*buf++ = 015;
			if (--m == 0) {
				Lfseen = TRUE; break;
			}
		}
		*buf++ =c;
		if (--m == 0)
			break;
	}
	if (m==count)
		return 0;
	else
		while (--m>=0)
			*buf++ = CPMEOF;
	return count;
}
/* fill buf with count chars */
zfilbuf(buf, count)
register char *buf;
{
	register c, m;

	m=count;
	while ((c=getc(in))!=EOF) {
		*buf++ =c;
		if (--m == 0)
			break;
	}
	return (count - m);
}

/* VARARGS1 */
vfile(f, a, b, c)
register char *f;
{
	if (Verbose > 2) {
		fprintf(stderr, f, a, b, c);
		fprintf(stderr, "\n");
	}
}


alrm()
{
	longjmp(tohere, -1);
}


/*
 * readock(timeout, count) reads character(s) from file descriptor 0
 *  (1 <= count <= 3)
 * it attempts to read count characters. If it gets more than one,
 * it is an error unless all are CAN
 * (otherwise, only normal response is ACK, CAN, or C)
 *  Only looks for one if Optiong, which signifies cbreak, not raw input
 *
 * timeout is in tenths of seconds
 */
readock(timeout, count)
{
	register int c;
	static char byt[5];

	if (Optiong)
		count = 1;	/* Special hack for cbreak */

	fflush(stdout);
	if (setjmp(tohere)) {
		zperr("TIMEOUT");
		return TIMEOUT;
	}
	c = timeout/10;
	if (c<2)
		c=2;
	if (Verbose>5) {
		fprintf(stderr, "Timeout=%d Calling alarm(%d) ", timeout, c);
		byt[1] = 0;
	}
	signal(SIGALRM, alrm); alarm(c);
#ifdef ONEREAD
	c=read(iofd, byt, 1);		/* regulus raw read is unique */
#else
	c=read(iofd, byt, count);
#endif
	alarm(0);
	if (Verbose>5)
		fprintf(stderr, "ret cnt=%d %x %x\n", c, byt[0], byt[1]);
	if (c<1)
		return TIMEOUT;
	if (c==1)
		return (byt[0]&0377);
	else
		while (c)
			if (byt[--c] != CAN)
				return ERROR;
	return CAN;
}
readline(n)
{
	return (readock(n, 1));
}


purgeline()
{
#ifdef USG
	ioctl(iofd, TCFLSH, 0);
#else
	lseek(iofd, 0L, 2);
#endif
}


/* send cancel string to get the other end to shut up */
canit()
{
	static char canistr[] = {
	 24,24,24,24,24,24,24,24,24,24,8,8,8,8,8,8,8,8,8,8,0
	};

	printf(canistr);
	fflush(stdout);
}

/*
 * Log an error
 */
/*VARARGS1*/
zperr(s,p,u)
char *s, *p, *u;
{
	if (Verbose <= 0)
		return;
	fprintf(stderr, "Retry %d: ", errors);
	fprintf(stderr, s, p, u);
	fprintf(stderr, "\n");
}

/*
 * substr(string, token) searches for token in string s
 * returns pointer to token within string if found, NULL otherwise
 */
char *
substr(s, t)
register char *s,*t;
{
	register char *ss,*tt;
	/* search for first char of token */
	for (ss=s; *s; s++)
		if (*s == *t)
			/* compare token with substring */
			for (ss=s,tt=t; ;) {
				if (*tt == 0)
					return s;
				if (*ss++ != *tt++)
					break;
			}
	return NULL;
}

char *babble[] = {
	"Send file(s) with ZMODEM/YMODEM/XMODEM Protocol",
	"	(Y) = Option applies to YMODEM only",
	"	(Z) = Option applies to ZMODEM only",
	"Usage:	sz [-12+abdefkLlNnquvwYy] [-] file ...",
	"	sz [-12Ceqv] -c COMMAND",
	"	sb [-12adfkquv] [-] file ...",
	"	sx [-12akquv] [-] file",
	"	1 Use stdout for modem input",
#ifdef CSTOPB
	"	2 Use 2 stop bits",
#endif
	"	+ Append to existing destination file (Z)",
	"	a (ASCII) change NL to CR/LF",
	"	b Binary file transfer override",
	"	c send COMMAND (Z)",
	"	d Change '.' to '/' in pathnames (Y/Z)",
	"	e Escape all control characters (Z)",
	"	f send Full pathname (Y/Z)",
	"	i send COMMAND, ack Immediately (Z)",
	"	k Send 1024 byte packets (Y)",
	"	L N Limit subpacket length to N bytes (Z)",
	"	l N Limit frame length to N bytes (l>=L) (Z)",
	"	n send file if source newer (Z)",
	"	N send file if source newer or longer (Z)",
	"	o Use 16 bit CRC instead of 32 bit CRC (Z)",
	"	p Protect existing destination file (Z)",
	"	r Resume/Recover interrupted file transfer (Z)",
	"	q Quiet (no progress reports)",
	"	u Unlink file after transmission",
	"	v Verbose - provide debugging information",
	"	w N Window is N bytes (Z)",
	"	Y Yes, overwrite existing file, skip if not present at rx (Z)",
	"	y Yes, overwrite existing file (Z)",
	"- as pathname sends standard input as sPID.sz or environment ONAME",
	""
};

usage()
{
	char **pp;

	for (pp=babble; **pp; ++pp)
		fprintf(stderr, "%s\n", *pp);
	fprintf(stderr, "%s for %s by Chuck Forsberg, Omen Technology INC\n",
	 VERSION, OS);
	fprintf(stderr, "\t\t\042The High Reliability Software\042\n");
	cucheck();
	exit(1);
}

/*
 * Get the receiver's init parameters
 */
getzrxinit()
{
	register n;
	struct stat f;

	for (n=10; --n>=0; ) {
		
		switch (zgethdr(Rxhdr, 1)) {
		case ZCHALLENGE:	/* Echo receiver's challenge numbr */
			stohdr(Rxpos);
			zshhdr(ZACK, Txhdr);
			continue;
		case ZCOMMAND:		/* They didn't see out ZRQINIT */
			stohdr(0L);
			zshhdr(ZRQINIT, Txhdr);
			continue;
		case ZRINIT:
			Rxflags = 0377 & Rxhdr[ZF0];
			Txfcs32 = (Wantfcs32 && (Rxflags & CANFC32));
			Zctlesc |= Rxflags & TESCCTL;
			Rxbuflen = (0377 & Rxhdr[ZP0])+((0377 & Rxhdr[ZP1])<<8);
			if ( !(Rxflags & CANFDX))
				Txwindow = 0;
			vfile("Rxbuflen=%d Tframlen=%d", Rxbuflen, Tframlen);
			if ( !Fromcu)
				signal(SIGINT, SIG_IGN);
#ifdef MODE2OK
			mode(2);	/* Set cbreak, XON/XOFF, etc. */
#endif
#ifndef READCHECK
#ifndef USG
			/* Use 1024 byte frames if no sample/interrupt */
			if (Rxbuflen < 32 || Rxbuflen > 1024) {
				Rxbuflen = 1024;
				vfile("Rxbuflen=%d", Rxbuflen);
			}
#endif
#endif
			/* Override to force shorter frame length */
			if (Rxbuflen && (Rxbuflen>Tframlen) && (Tframlen>=32))
				Rxbuflen = Tframlen;
			if ( !Rxbuflen && (Tframlen>=32) && (Tframlen<=1024))
				Rxbuflen = Tframlen;
			vfile("Rxbuflen=%d", Rxbuflen);

			/* If using a pipe for testing set lower buf len */
			fstat(iofd, &f);
			if ((f.st_mode & S_IFMT) != S_IFCHR
			  && (Rxbuflen == 0 || Rxbuflen > 4096))
				Rxbuflen = 4096;
			/*
			 * If input is not a regular file, force ACK's each 1024
			 *  (A smarter strategey could be used here ...)
			 */
			if ( !Command) {
				fstat(fileno(in), &f);
				if (((f.st_mode & S_IFMT) != S_IFREG)
				  && (Rxbuflen == 0 || Rxbuflen > 1024))
					Rxbuflen = 1024;
			}

			if (Baudrate > 300)	/* Set initial subpacket len */
				blklen = 256;
			if (Baudrate > 1200)
				blklen = 512;
			if (Baudrate > 2400)
				blklen = 1024;
			if (Rxbuflen && blklen>Rxbuflen)
				blklen = Rxbuflen;
			if (blkopt && blklen > blkopt)
				blklen = blkopt;
			vfile("Rxbuflen=%d blklen=%d", Rxbuflen, blklen);
			vfile("Txwindow = %u Txwspac = %d", Txwindow, Txwspac);