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!

#define VERSION "sz 1.44 03-03-88"
#define PUBDIR "/usr/spool/uucppublic"

/*% cc -M0 -Ox -K -i -DNFGVMIN -DREADCHECK sz.c -lx -o sz; size sz
 *
 * sz.c By Chuck Forsberg
 *
 *	cc -O sz.c -o sz		USG (SYS III/V) Unix
 *	cc -O -DSV sz.c -o sz		Sys V Release 2 with non-blocking input
 *					Define to allow reverse channel checking
 *	cc -O -DV7  sz.c -o sz		Unix Version 7, 2.8 - 4.3 BSD
 *
 *	cc -O -K -i -DNFGVMIN -DREADCHECK sz.c -lx -o sz	Xenix
 *
 *	ln sz sb			**** All versions ****
 *	ln sz sx			**** All versions ****
 *
 *
 *  ******* Some systems (Venix, Coherent, Regulus) do not *******
 *  ******* support tty raw mode read(2) identically to    *******
 *  ******* Unix. ONEREAD must be defined to force one     *******
 *  ******* character reads for these systems.		   *******
 *
 * A program for Unix to send files and commands to computers running
 *  Professional-YAM, PowerCom, YAM, IMP, or programs supporting Y/XMODEM.
 *
 *  Sz uses buffered I/O to greatly reduce CPU time compared to UMODEM.
 *
 *  USG UNIX (3.0) ioctl conventions courtesy Jeff Martin
 *
 * 1.34 implements tx backchannel garbage count and ZCRCW after ZRPOS
 * in accordance with the 7-31-87 ZMODEM Protocol Description
 */


char *substr(), *getenv();

#define LOGFILE "/tmp/szlog"

#include <stdio.h>
#include <signal.h>
#include <setjmp.h>
#include <ctype.h>

#define PATHLEN 256
#define OK 0
#define FALSE 0
#define TRUE 1
#define ERROR (-1)

#define HOWMANY 2
int Zmodem=0;		/* ZMODEM protocol requested by receiver */
unsigned Baudrate;
unsigned Txwindow;	/* Control the size of the transmitted window */
unsigned Txwspac;	/* Spacing between zcrcq requests */
unsigned Txwcnt;	/* Counter used to space ack requests */
long Lrxpos;		/* Receiver's last reported offset */
int errors;
#include "rbsb.c"	/* most of the system dependent stuff here */

int Filesleft;
long Totalleft;

/*
 * Attention string to be executed by receiver to interrupt streaming data
 *  when an error is detected.  A pause (0336) may be needed before the
 *  ^C (03) or after it.
 */
#ifdef READCHECK
char Myattn[] = { 0 };
#else
#ifdef USG
char Myattn[] = { 03, 0336, 0 };
#else
char Myattn[] = { 0 };
#endif
#endif

FILE *in;

/* Ward Christensen / CP/M parameters - Don't change these! */
#define ENQ 005
#define CAN ('X'&037)
#define XOFF ('s'&037)
#define XON ('q'&037)
#define SOH 1
#define STX 2
#define EOT 4
#define ACK 6
#define NAK 025
#define CPMEOF 032
#define WANTCRC 0103	/* send C not NAK to get crc not checksum */
#define WANTG 0107	/* Send G not NAK to get nonstop batch xmsn */
#define TIMEOUT (-2)
#define RCDO (-3)
#define RETRYMAX 10

char Lastrx;
char Crcflg;
int Wcsmask=0377;
int Verbose=0;
int Modem2=0;		/* XMODEM Protocol - don't send pathnames */
int Restricted=0;	/* restricted; no /.. or ../ in filenames */
int Quiet=0;		/* overrides logic that would otherwise set verbose */
int Ascii=0;		/* Add CR's for brain damaged programs */
int Fullname=0;		/* transmit full pathname */
int Unlinkafter=0;	/* Unlink file after it is sent */
int Dottoslash=0;	/* Change foo.bar.baz to foo/bar/baz */
int firstsec;
int errcnt=0;		/* number of files unreadable */
int blklen=128;		/* length of transmitted records */
int Optiong;		/* Let it rip no wait for sector ACK's */
int Noeofseen;
int Totsecs;		/* total number of sectors this file */
char txbuf[1024];
int Filcnt=0;		/* count of number of files opened */
int Lfseen=0;
unsigned Rxbuflen = 16384;	/* Receiver's max buffer length */
int Tframlen = 0;	/* Override for tx frame length */
int blkopt=0;		/* Override value for zmodem blklen */
int Rxflags = 0;
long bytcnt;
int Wantfcs32 = TRUE;	/* want to send 32 bit FCS */
char Lzconv;	/* Local ZMODEM file conversion request */
char Lzmanag;	/* Local ZMODEM file management request */
int Lskipnocor;
char Lztrans;
char zconv;		/* ZMODEM file conversion request */
char zmanag;		/* ZMODEM file management request */
char ztrans;		/* ZMODEM file transport request */
int Command;		/* Send a command, then exit. */
char *Cmdstr;		/* Pointer to the command string */
int Cmdtries = 11;
int Cmdack1;		/* Rx ACKs command, then do it */
int Exitcode;
int Test;		/* 1= Force receiver to send Attn, etc with qbf. */
			/* 2= Character transparency test */
char *qbf="The quick brown fox jumped over the lazy dog's back 1234567890\r\n";
long Lastread;		/* Beginning offset of last buffer read */
int Lastn;		/* Count of last buffer read or -1 */
int Dontread;		/* Don't read the buffer, it's still there */
long Lastsync;		/* Last offset to which we got a ZRPOS */
int Beenhereb4;		/* How many times we've been ZRPOS'd same place */

jmp_buf tohere;		/* For the interrupt on RX timeout */
jmp_buf intrjmp;	/* For the interrupt on RX CAN */

/* called by signal interrupt or terminate to clean things up */
bibi(n)
{
	canit(); fflush(stdout); mode(0);
	fprintf(stderr, "sz: caught signal %d; exiting\n", n);
	if (n == SIGQUIT)
		abort();
	if (n == 99)
		fprintf(stderr, "mode(2) in rbsb.c not implemented!!\n");
	cucheck();
	exit(128+n);
}
/* Called when ZMODEM gets an interrupt (^X) */
onintr()
{
	signal(SIGINT, SIG_IGN);
	longjmp(intrjmp, -1);
}


#define sendline(c) putchar(c & Wcsmask)

#define xsendline(c) putchar(c)

flushmo()
{
	fflush(stdout);
}

int Zctlesc;	/* Encode control characters */
int Nozmodem = 0;	/* If invoked as "sb" */
char *Progname = "sz";
int Zrwindow = 1400;	/* RX window size (controls garbage count) */
#include "zm.c"


main(argc, argv)
char *argv[];
{
	register char *cp;
	register npats;
	int dm;
	char **patts;
	static char xXbuf[BUFSIZ];

	if ((cp = getenv("ZNULLS")) && *cp)
		Znulls = atoi(cp);
	if ((cp=getenv("SHELL")) && (substr(cp, "rsh") || substr(cp, "rksh")))
		Restricted=TRUE;
	from_cu();
	chkinvok(argv[0]);

	Rxtimeout = 600;
	npats=0;
	if (argc<2)
		usage();
	setbuf(stdout, xXbuf);		
	while (--argc) {
		cp = *++argv;
		if (*cp++ == '-' && *cp) {
			while ( *cp) {
				switch(*cp++) {
				case '+':
					Lzmanag = ZMAPND; break;
				case '1':
					iofd = 1; break;
#ifdef CSTOPB
				case '2':
					Twostop = TRUE; break;
#endif
				case '7':
					Wcsmask=0177; break;
				case 'a':
					Lzconv = ZCNL;
					Ascii = TRUE; break;
				case 'b':
					Lzconv = ZCBIN; break;
				case 'C':
					if (--argc < 1) {
						usage();
					}
					Cmdtries = atoi(*++argv);
					break;
				case 'i':
					Cmdack1 = ZCACK1;
					/* **** FALL THROUGH TO **** */
				case 'c':
					if (--argc != 1) {
						usage();
					}
					Command = TRUE;
					Cmdstr = *++argv;
					break;
				case 'd':
					++Dottoslash;
					/* **** FALL THROUGH TO **** */
				case 'f':
					Fullname=TRUE; break;
				case 'e':
					Zctlesc = 1; break;
				case 'k':
					blklen=1024; break;
				case 'L':
					if (--argc < 1) {
						usage();
					}
					blkopt = atoi(*++argv);
					if (blkopt<24 || blkopt>1024)
						usage();
					break;
				case 'l':
					if (--argc < 1) {
						usage();
					}
					Tframlen = atoi(*++argv);
					if (Tframlen<32 || Tframlen>1024)
						usage();
					break;
				case 'N':
					Lzmanag = ZMNEWL;  break;
				case 'n':
					Lzmanag = ZMNEW;  break;
				case 'o':
					Wantfcs32 = FALSE; break;
				case 'p':
					Lzmanag = ZMPROT;  break;
				case 'r':
					Lzconv = ZCRESUM;
				case 'q':
					Quiet=TRUE; Verbose=0; break;
				case 't':
					if (--argc < 1) {
						usage();
					}
					Rxtimeout = atoi(*++argv);
					if (Rxtimeout<10 || Rxtimeout>1000)
						usage();
					break;
				case 'T':
					if (++Test > 1) {
						chartest(1); chartest(2);
						mode(0);  exit(0);
					}
					break;
				case 'u':
					++Unlinkafter; break;
				case 'v':
					++Verbose; break;
				case 'w':
					if (--argc < 1) {
						usage();
					}
					Txwindow = atoi(*++argv);
					if (Txwindow < 256)
						Txwindow = 256;
					Txwindow = (Txwindow/64) * 64;
					Txwspac = Txwindow/4;
					if (blkopt > Txwspac
					 || (!blkopt && Txwspac < 1024))
						blkopt = Txwspac;
					break;
				case 'X':
					++Modem2; break;
				case 'Y':
					Lskipnocor = TRUE;
					/* **** FALLL THROUGH TO **** */
				case 'y':
					Lzmanag = ZMCLOB; break;
				default:
					usage();
				}
			}
		}
		else if ( !npats && argc>0) {
			if (argv[0][0]) {
				npats=argc;
				patts=argv;
				if ( !strcmp(*patts, "-"))
					iofd = 1;
			}
		}
	}
	if (npats < 1 && !Command && !Test) 
		usage();
	if (Verbose) {
		if (freopen(LOGFILE, "a", stderr)==NULL) {
			printf("Can't open log file %s\n",LOGFILE);
			exit(0200);
		}
		setbuf(stderr, NULL);
	}
	if (Fromcu && !Quiet) {
		if (Verbose == 0)
			Verbose = 2;
	}

	mode(1);

	if (signal(SIGINT, bibi) == SIG_IGN) {
		signal(SIGINT, SIG_IGN); signal(SIGKILL, SIG_IGN);
	} else {
		signal(SIGINT, bibi); signal(SIGKILL, bibi);
	}
	if ( !Fromcu)
		signal(SIGQUIT, SIG_IGN);
	signal(SIGTERM, bibi);

	if ( !Modem2) {
		if (!Nozmodem) {
			printf("rz\r");  fflush(stdout);
		}
		countem(npats, patts);
		if (!Command && !Quiet && Verbose != 1) {
			dm = Filesleft + (Totalleft*11L) / (Baudrate * 6L);
			fprintf(stderr,
			 "%s: %d file%s %ld bytes %u.%u minutes\r\n",
			 Progname, Filesleft, Filesleft>1?"s":"", Totalleft,
			 dm/10, dm%10);
		}
		if (!Nozmodem) {
			stohdr(0L);
			if (Command)
				Txhdr[ZF0] = ZCOMMAND;
			zshhdr(ZRQINIT, Txhdr);
		}
	}
	fflush(stdout);

	if (Command) {
		if (getzrxinit()) {
			Exitcode=0200; canit();
		}
		else if (zsendcmd(Cmdstr, 1+strlen(Cmdstr))) {
			Exitcode=0200; canit();
		}
	} else if (wcsend(npats, patts)==ERROR) {
		Exitcode=0200;
		canit();
	}
	fflush(stdout);
	mode(0);
	dm = ((errcnt != 0) | Exitcode);
	if (dm)
		cucheck();
	exit(dm);
	/*NOTREACHED*/
}

wcsend(argc, argp)
char *argp[];
{
	register n;

	Crcflg=FALSE;
	firstsec=TRUE;
	bytcnt = -1;
	for (n=0; n<argc; ++n) {
		Totsecs = 0;
		if (wcs(argp[n])==ERROR)
			return ERROR;
	}
	Totsecs = 0;
	if (Filcnt==0) {	/* bitch if we couldn't open ANY files */
		if ( !Modem2) {
			Command = TRUE;
			Cmdstr = "echo \"sz: Can't open any requested files\"";
			if (getnak()) {
				Exitcode=0200; canit();
			}
			if (!Zmodem)
				canit();
			else if (zsendcmd(Cmdstr, 1+strlen(Cmdstr))) {
				Exitcode=0200; canit();
			}
			Exitcode = 1; return OK;
		}
		canit();
		fprintf(stderr,"\r\nCan't open any requested files.\r\n");
		return ERROR;
	}
	if (Zmodem)
		saybibi();
	else if ( !Modem2)
		wctxpn("");
	return OK;
}

wcs(oname)
char *oname;
{
	register c;
	register char *p;
	struct stat f;
	char name[PATHLEN];

	strcpy(name, oname);

	if (Restricted) {
		/* restrict pathnames to current tree or uucppublic */
		if ( substr(name, "../")
		 || (name[0]== '/' && strncmp(name, PUBDIR, strlen(PUBDIR))) ) {
			canit();
			fprintf(stderr,"\r\nsz:\tSecurity Violation\r\n");
			return ERROR;
		}
	}

	if ( !strcmp(oname, "-")) {
		if ((p = getenv("ONAME")) && *p)
			strcpy(name, p);
		else
			sprintf(name, "s%d.sz", getpid());
		in = stdin;
	}
	else if ((in=fopen(oname, "r"))==NULL) {
		++errcnt;
		return OK;	/* pass over it, there may be others */
	}
	++Noeofseen;  Lastread = 0;  Lastn = -1; Dontread = FALSE;
	/* Check for directory or block special files */
	fstat(fileno(in), &f);
	c = f.st_mode & S_IFMT;
	if (c == S_IFDIR || c == S_IFBLK) {
		fclose(in);
		return OK;
	}

	++Filcnt;
	switch (wctxpn(name)) {
	case ERROR:
		return ERROR;
	case ZSKIP:
		return OK;
	}
	if (!Zmodem && wctx(f.st_size)==ERROR)
		return ERROR;
	if (Unlinkafter)
		unlink(oname);
	return 0;
}

/*
 * generate and transmit pathname block consisting of
 *  pathname (null terminated),
 *  file length, mode time and file mode in octal
 *  as provided by the Unix fstat call.
 *  N.B.: modifies the passed name, may extend it!
 */
wctxpn(name)
char *name;
{
	register char *p, *q;
	char name2[PATHLEN];
	struct stat f;

	if (Modem2) {
		if ((in!=stdin) && *name && fstat(fileno(in), &f)!= -1) {
			fprintf(stderr, "Sending %s, %ld blocks: ",
			  name, f.st_size>>7);
		}
		fprintf(stderr, "Give your local XMODEM receive command now.\r\n");
		return OK;
	}
	zperr("Awaiting pathname nak for %s", *name?name:"<END>");
	if ( !Zmodem)
		if (getnak())
			return ERROR;