Category : UNIX Files
Archive   : RZSZ0593.ZIP
Filename : SZ.C

#define VERSION "3.23 5-03-93"
#define PUBDIR "/usr/spool/uucppublic"

/*
**************************************************************************
*
* sz.c By Chuck Forsberg, Omen Technology INC
* Copyright 1993 Omen Technology Inc All Rights Reserved
*
*
* This version implements numerous enhancements including ZMODEM
* Run Length Encoding and variable length headers. These
* features were not funded by the original Telenet development
* contract.
*
* This software may be freely used for educational (didactic
* only) purposes. This software may also be freely used to
* support file transfer operations to or from licensed Omen
* Technology products. Use with other commercial or shareware
* programs (Crosstalk, Procomm, etc.) REQUIRES REGISTRATION.
*
* Any programs which use part or all of this software must be
* provided in source form with this notice intact except by
* written permission from Omen Technology Incorporated.
*
*
* Use of this software for commercial or administrative purposes
* except when exclusively limited to interfacing Omen Technology
* products requires a per port license payment of $20.00 US per
* port (less in quantity, see mailer.rz). Use of this code by
* inclusion, decompilation, reverse engineering or any other means
* constitutes agreement to these conditions and acceptance of
* liability to license the materials and payment of reasonable
* legal costs necessary to enforce this license agreement.
*
*
* Omen Technology Inc
* Post Office Box 4681
* Portland OR 97208
*
* This code is made available in the hope it will be useful,
* BUT WITHOUT ANY WARRANTY OF ANY KIND OR LIABILITY FOR ANY
* DAMAGES OF ANY KIND.
*
* USG UNIX (3.0) ioctl conventions courtesy Jeff Martin
*/

char *Copyrsz = "Copyright 1993 Omen Technology Inc All Rights Reserved";

char *substr(), *getenv();

#define LOGFILE "/tmp/szlog"
#define LOGFILE2 "szlog"
#include
#include
#include
#include
extern int errno;
#define STATIC

#define PATHLEN 256
#define OK 0
#define FALSE 0
#ifdef TRUE
#undef TRUE
#endif
#define TRUE 1
#define ERROR (-1)
/* 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 GCOUNT (-4)
#define RETRYMAX 10


#define HOWMANY 2
STATIC int Zmodem=0; /* ZMODEM protocol requested by receiver */
unsigned Baudrate = 9600; /* Default, set by first mode() call */
STATIC unsigned Effbaud = 9600;
STATIC unsigned Txwindow; /* Control the size of the transmitted window */
STATIC unsigned Txwspac; /* Spacing between zcrcq requests */
STATIC unsigned Txwcnt; /* Counter used to space ack requests */
STATIC unsigned long Lrxpos; /* Receiver's last reported offset */
STATIC int errors;
char endmsg[80] = {0}; /* Possible message to display on exit */

#include "rbsb.c" /* most of the system dependent stuff here */

#include "crctab.c"

STATIC int Filesleft;
STATIC unsigned 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
STATIC char Myattn[] = { 0 };
#else
#ifdef USG
STATIC char Myattn[] = { 03, 0336, 0 };
#endif
#endif

FILE *in;

STATIC int Canseek = 1; /* 1: Can seek 0: only rewind -1: neither (pipe) */

#ifdef TXBSIZE
#define TXBMASK (TXBSIZE-1)
STATIC char Txb[TXBSIZE]; /* Circular buffer for file reads */
STATIC char *txbuf = Txb; /* Pointer to current file segment */
#else
STATIC char txbuf[1024];
#endif
STATIC unsigned long vpos = 0; /* Number of bytes read from file */

STATIC char Lastrx;
STATIC char Crcflg;
STATIC int Modem2=0; /* XMODEM Protocol - don't send pathnames */
STATIC int Restricted=0; /* restricted; no /.. or ../ in filenames */
STATIC int Fullname=0; /* transmit full pathname */
STATIC int Unlinkafter=0; /* Unlink file after it is sent */
STATIC int Dottoslash=0; /* Change foo.bar.baz to foo/bar/baz */
STATIC int firstsec;
STATIC int errcnt=0; /* number of files unreadable */
STATIC int blklen=128; /* length of transmitted records */
STATIC int Optiong; /* Let it rip no wait for sector ACK's */
STATIC int Eofseen; /* EOF seen on input set by zfilbuf */
STATIC int BEofseen; /* EOF seen on input set by fooseek */
STATIC int Totsecs; /* total number of sectors this file */
STATIC int Filcnt=0; /* count of number of files opened */
STATIC unsigned Rxbuflen=16384; /* Receiver's max buffer length */
STATIC int Tframlen = 0; /* Override for tx frame length */
STATIC int blkopt=0; /* Override value for zmodem blklen */
STATIC int Rxflags = 0;
STATIC unsigned long bytcnt;
STATIC int Wantfcs32 = TRUE; /* want to send 32 bit FCS */
STATIC char Lzconv; /* Local ZMODEM file conversion request */
STATIC char Lzmanag; /* Local ZMODEM file management request */
STATIC int Lskipnocor;
STATIC char Lztrans;
STATIC int Command; /* Send a command, then exit. */
STATIC char *Cmdstr; /* Pointer to the command string */
STATIC int Cmdtries = 11;
STATIC int Cmdack1; /* Rx ACKs command, then do it */
STATIC int Exitcode;
STATIC int Test; /* 1= Force receiver to send Attn, etc with qbf. */
/* 2= Character transparency test */
STATIC char *qbf=
"The quick brown fox jumped over the lazy dog's back 1234567890\r\n";
STATIC unsigned long Lastsync; /* Last offset to which we got a ZRPOS */
STATIC int Beenhereb4; /* How many times we've been ZRPOS'd here */

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


/* called by signal interrupt or terminate to clean things up */
void
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");
exit(3);
}

/* Called when ZMODEM gets an interrupt (^X) */
void
onintr(c)
{
signal(SIGINT, SIG_IGN);
longjmp(intrjmp, -1);
}

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

/*
* Log an error
*/
/*VARARGS1*/
void
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");
}

#include "zm.c"
#include "zmr.c"

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

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

Rxtimeout = 600;
npats=0;
if (argc<2)
usage();
while (--argc) {
cp = *++argv;
if (*cp++ == '-' && *cp) {
while ( *cp) {
switch(*cp++) {
case '\\':
*cp = toupper(*cp); continue;
case '+':
Lzmanag = ZMAPND; break;
#ifdef CSTOPB
case '2':
Twostop = TRUE; break;
#endif
case 'a':
if (Nozmodem || Modem2)
usage;
Lzconv = ZCNL; break;
case 'b':
Lzconv = ZCBIN; break;
case 'C':
if (--argc < 1) {
usage();
}
Cmdtries = atoi(*++argv);
break;
case 'c':
Lzmanag = ZMCHNG; 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':
if (Lzconv == ZCRESUM)
Lzmanag = (Lzmanag & ZMMASK) | ZMCRC;
Lzconv = ZCRESUM; break;
case 't':
if (--argc < 1) {
usage();
}
Rxtimeout = atoi(*++argv);
if (Rxtimeout<10 || Rxtimeout>1000)
usage();
break;
case 'T':
chartest(1); chartest(2);
mode(0); exit(0);
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 'Y':
Lskipnocor = TRUE;
/* **** FALLL THROUGH TO **** */
case 'y':
Lzmanag = ZMCLOB; break;
case 'Z':
case 'z':
Lztrans = ZTRLE; break;
default:
usage();
}
}
}
else if (Command) {
if (argc != 1) {
usage();
}
Cmdstr = *argv;
}
else if ( !npats && argc>0) {
if (argv[0][0]) {
npats=argc;
patts=argv;
}
}
}
if (npats < 1 && !Command && !Test)
usage();
if (Verbose) {
if (freopen(LOGFILE, "a", stderr)==NULL)
if (freopen(LOGFILE2, "a", stderr)==NULL) {
printf("Can't open log file!");
exit(2);
}
setbuf(stderr, NULL);
}
vfile("%s %s for %s\n", Progname, VERSION, OS);

mode(3);

if (signal(SIGINT, bibi) == SIG_IGN) {
signal(SIGINT, SIG_IGN); signal(SIGKILL, SIG_IGN);
} else {
signal(SIGINT, bibi); signal(SIGKILL, bibi);
}
#ifdef SIGQUIT
signal(SIGQUIT, SIG_IGN);
#endif
#ifdef SIGTERM
signal(SIGTERM, bibi);
#endif

if ( !Modem2) {
if (!Nozmodem) {
printf("rz\r"); fflush(stdout);
}
countem(npats, patts);
if (!Nozmodem) {
stohdr(0L);
if (Command)
Txhdr[ZF0] = ZCOMMAND;
zshhdr(4, ZRQINIT, Txhdr);
}
}
fflush(stdout);

if (Command) {
if (getzrxinit()) {
Exitcode=1; canit();
}
else if (zsendcmd(Cmdstr, 1+strlen(Cmdstr))) {
Exitcode=1; canit();
}
} else if (wcsend(npats, patts)==ERROR) {
Exitcode=1;
canit();
}
if (endmsg[0]) {
printf(" %s: %s\r\n", Progname, endmsg);
if (Verbose)
fprintf(stderr, "%s\r\n", endmsg);
}
printf("%s %s finished.\r\n", Progname, VERSION);
fflush(stdout);
mode(0);
if(errcnt || Exitcode)
exit(1);

#ifndef REGISTERED
/* Removing or disabling this code without registering is theft */
if (!Usevhdrs) {
printf("\n\n\nPlease read the License Agreement in sz.doc\n");
fflush(stdout);
sleep(10);
}
#endif
exit(0);
/*NOTREACHED*/
}

/* Say "bibi" to the receiver, try to do it cleanly */
void
saybibi()
{
for (;;) {
stohdr(0L); /* CAF Was zsbhdr - minor change */
zshhdr(4, ZFIN, Txhdr); /* to make debugging easier */
switch (zgethdr(Rxhdr, 0)) {
case ZFIN:
sendline('O'); sendline('O'); flushmo();
case ZCAN:
case TIMEOUT:
return;
}
}
}

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

Crcflg=FALSE;
firstsec=TRUE;
bytcnt = -1;
if (Nozmodem) {
printf("Start your YMODEM receive. "); fflush(stdout);
}
for (n=0; n Totsecs = 0;
if (wcs(argp[n])==ERROR)
return ERROR;
}
Totsecs = 0;
if (Filcnt==0) { /* bitch if we couldn't open ANY files */
if (!Nozmodem && !Modem2) {
Command = TRUE;
Cmdstr = "echo \"sz: Can't open any requested files\"";
if (getnak()) {
Exitcode=1; canit();
}
if (!Zmodem)
canit();
else if (zsendcmd(Cmdstr, 1+strlen(Cmdstr))) {
Exitcode=1; canit();
}
Exitcode = 1; return OK;
}
canit();
sprintf(endmsg, "Can't open any requested files");
return ERROR;
}
if (Zmodem)
saybibi();
else if ( !Modem2)
wctxpn("");
return OK;
}

wcs(oname)
char *oname;
{
register c;
register char *p, *q;
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(); sprintf(endmsg,"Security Violation");
return ERROR;
}
}

in=fopen(oname, "r");

if (in==NULL) {
++errcnt;
return OK; /* pass over it, there may be others */
}
BEofseen = Eofseen = 0; vpos = 0;

/* Check for directory */
fstat(fileno(in), &f);
#ifdef POSIX
if (S_ISDIR(f.st_mode))
#else
c = f.st_mode & S_IFMT;
if (c == S_IFDIR || c == S_IFBLK)
#endif
{
fclose(in);
return OK;
}

++Filcnt;
switch (wctxpn(name)) {
case ZSKIP:
case ZFERR:
return OK;
case OK:
break;
default:
return ERROR;
}
if (!Zmodem && wctx(f.st_size))
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 (*name && fstat(fileno(in), &f)!= -1) {
fprintf(stderr, "Sending %s, %ld XMODEM blocks. ",
name, (127+f.st_size)>>7);
}
fprintf(stderr, "Give your local XMODEM receive command now.\r\n");
fflush(stderr);
return OK;
}
zperr("Awaiting pathname nak for %s", *name?name:"");
if ( !Zmodem)
if (getnak())
return ERROR;

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 (*name) {
if (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)
Filesleft = 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 = readline(800)) {
case ZPAD:
if (getzrxinit())
return ERROR;
return FALSE;
case TIMEOUT:
sprintf(endmsg, "Timeout waiting for ZRINIT");
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 = readline(20)) == CAN && Lastrx == CAN) {
sprintf(endmsg, "Got CAN waiting to send file");
return TRUE;
}
default:
break;
}
Lastrx = firstch;
}
}


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

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

while ((firstch=readline(Rxtimeout))!=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);
flushmo();
++attempts;
}
while ((firstch=(readline(Rxtimeout)) != 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);
flushmo();

if (Optiong) {
firstsec = FALSE; return OK;
}
firstch = readline(Rxtimeout);
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 = readline(Rxtimeout)) == 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;

m = read(fileno(in), buf, count);
if (m <= 0)
return 0;
while (m < count)
buf[m++] = 032;
return count;
}

/* Fill buffer with blklen chars */
zfilbuf()
{
int n;

#ifdef TXBSIZE
vfile("zfilbuf: bytcnt =%lu vpos=%lu blklen=%d", bytcnt, vpos, blklen);
/* We assume request is within buffer, or just beyond */
txbuf = Txb + (bytcnt & TXBMASK);
if (vpos <= bytcnt) {
n = fread(txbuf, 1, blklen, in);

vpos += n;
if (n < blklen)
Eofseen = 1;
vfile("zfilbuf: n=%d vpos=%lu Eofseen=%d", n, vpos, Eofseen);
return n;
}
if (vpos >= (bytcnt+blklen))
return blklen;
/* May be a short block if crash recovery etc. */
Eofseen = BEofseen;
return (vpos - bytcnt);
#else
n = fread(txbuf, 1, blklen, in);
if (n < blklen)
Eofseen = 1;
return n;
#endif
}

#ifdef TXBSIZE
/* Replacement for brain damaged fseek function. Returns 0==success */
fooseek(fptr, pos, whence)
FILE *fptr;
unsigned long pos;
{
unsigned long m, n;

vfile("fooseek: pos =%lu vpos=%lu Canseek=%d", pos, vpos, Canseek);
/* Seek offset < current buffer */
if (pos < (vpos -TXBSIZE +1024)) {
BEofseen = 0;
if (Canseek > 0) {
vpos = pos & ~TXBMASK;
if (vpos >= pos)
vpos -= TXBSIZE;
if (fseek(fptr, vpos, 0))
return 1;
}
else if (Canseek == 0) {
if (fseek(fptr, vpos = 0L, 0))
return 1;
} else
return 1;
while (vpos < pos) {
n = fread(Txb, 1, TXBSIZE, fptr);
vpos += n;
vfile("n=%d vpos=%ld", n, vpos);
if (n < TXBSIZE) {
BEofseen = 1;
break;
}
}
vfile("vpos=%ld", vpos);
return 0;
}
/* Seek offset > current buffer (Crash Recovery, etc.) */
if (pos > vpos) {
if (Canseek)
if (fseek(fptr, vpos = (pos & ~TXBMASK), 0))
return 1;
while (vpos <= pos) {
txbuf = Txb + (vpos & TXBMASK);
m = TXBSIZE - (vpos & TXBMASK);
vfile("m=%ld vpos=%ld", m,vpos);
n = fread(txbuf, 1, m, fptr);
vfile("n=%ld vpos=%ld", n,vpos);
vpos += n;
vfile("bo=%d m=%ld vpos=%ld", txbuf-Txb,m,vpos);
if (n < m) {
BEofseen = 1;
break;
}
}
return 0;
}
/* Seek offset is within current buffer */
vfile("within buffer: vpos=%ld", vpos);
return 0;
}
#define fseek fooseek
#endif


/*
* 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 *usinfo[] = {
"Send Files and Commands with ZMODEM/YMODEM/XMODEM Protocol\n",
"Usage: sz [-2+abcdefklLnNuvwyY] [-] file ...",
"\t zcommand [-2Cev] COMMAND",
"\t zcommandi [-2Cev] COMMAND",
"\t sb [-2adfkuv] [-] file ...",
"\t sx [-2akuv] [-] file",
""
};

usage()
{
char **pp;

fprintf(stderr, "\n%s %s for %s by Chuck Forsberg, Omen Technology INC\n",
Progname, VERSION, OS);
fprintf(stderr, "\t\t\042The High Reliability Software\042\n");
for (pp=usinfo; **pp; ++pp)
fprintf(stderr, "%s\n", *pp);
fprintf(stderr,"\nCopyright 1993 Omen Technology INC All Rights Reserved\n");
fprintf(stderr,
"See sz.doc for option descriptions and licensing information.\n\n");
exit(3);
}

/*
* 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(4, ZACK, Txhdr);
continue;
case ZCOMMAND: /* They didn't see out ZRQINIT */
stohdr(0L);
zshhdr(4, ZRQINIT, Txhdr);
continue;
case ZRINIT:
Rxflags = 0377 & Rxhdr[ZF0];
Usevhdrs = Rxhdr[ZF1] & CANVHDR;
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);
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 input is not a regular file, force ACK's to
* prevent running beyond the buffer limits
*/
if ( !Command) {
fstat(fileno(in), &f);
if (
#ifdef POSIX
!S_ISREG(f.st_mode)
#else
(f.st_mode & S_IFMT) != S_IFREG
#endif
) {
Canseek = -1;
#ifdef TXBSIZE
Txwindow = TXBSIZE - 1024;
Txwspac = TXBSIZE/4;
#else
return ERROR;
#endif
}
}

/* Set initial subpacket length */
if (blklen < 1024) { /* Command line override? */
if (Effbaud > 300)
blklen = 256;
if (Effbaud > 1200)
blklen = 512;
if (Effbaud > 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);


if (Lztrans == ZTRLE && (Rxflags & CANRLE))
Txfcs32 = 2;
else
Lztrans = 0;

return (sendzsinit());
case ZCAN:
case TIMEOUT:
return ERROR;
case ZRQINIT:
if (Rxhdr[ZF0] == ZCOMMAND)
continue;
default:
zshhdr(4, ZNAK, Txhdr);
continue;
}
}
return ERROR;
}

/* Send send-init information */
sendzsinit()
{
register c;

if (Myattn[0] == '\0' && (!Zctlesc || (Rxflags & TESCCTL)))
return OK;
errors = 0;
for (;;) {
stohdr(0L);
#ifdef ALTCANOFF
Txhdr[ALTCOFF] = ALTCANOFF;
#endif
if (Zctlesc) {
Txhdr[ZF0] |= TESCCTL; zshhdr(4, ZSINIT, Txhdr);
}
else
zsbhdr(4, ZSINIT, Txhdr);
zsdata(Myattn, ZATTNLEN, ZCRCW);
c = zgethdr(Rxhdr, 1);
switch (c) {
case ZCAN:
return ERROR;
case ZACK:
return OK;
default:
if (++errors > 19)
return ERROR;
continue;
}
}
}

/* Send file name and related info */
zsendfile(buf, blen)
char *buf;
{
register c;
register unsigned long crc;
long lastcrcrq = -1;
char *p;

for (errors=0; ++errors<11;) {
Txhdr[ZF0] = Lzconv; /* file conversion request */
Txhdr[ZF1] = Lzmanag; /* file management request */
if (Lskipnocor)
Txhdr[ZF1] |= ZMSKNOLOC;
Txhdr[ZF2] = Lztrans; /* file transport request */
Txhdr[ZF3] = 0;
zsbhdr(4, ZFILE, Txhdr);
zsdata(buf, blen, ZCRCW);
again:
c = zgethdr(Rxhdr, 1);
switch (c) {
case ZRINIT:
while ((c = readline(50)) > 0)
if (c == ZPAD) {
goto again;
}
continue;
case ZCAN:
case TIMEOUT:
case ZABORT:
case ZFIN:
sprintf(endmsg, "Got %s on pathname", frametypes[c+FTOFFSET]);
return ERROR;
default:
sprintf(endmsg, "Got %d frame type on pathname", c);
continue;
case ERROR:
case ZNAK:
continue;
case ZCRC:
if (Rxpos != lastcrcrq) {
lastcrcrq = Rxpos;
crc = 0xFFFFFFFFL;
if (Canseek >= 0) {
fseek(in, 0L, 0);
while (((c = getc(in)) != EOF) && --lastcrcrq)
crc = UPDC32(c, crc);
crc = ~crc;
clearerr(in); /* Clear possible EOF */
lastcrcrq = Rxpos;
}
}
stohdr(crc);
zsbhdr(4, ZCRC, Txhdr);
goto again;
case ZFERR:
case ZSKIP:
sprintf(endmsg, "File skipped by receiver request");
fclose(in); return c;
case ZRPOS:
/*
* Suppress zcrcw request otherwise triggered by
* lastyunc==bytcnt
*/
if (fseek(in, Rxpos, 0))
return ERROR;
Lastsync = (bytcnt = Txpos = Lrxpos = Rxpos) -1;
return zsendfdata();
}
}
fclose(in); return ERROR;
}

/* Send the data in the file */
zsendfdata()
{
register c, e, n;
register newcnt;
register long tcount = 0;
int junkcount; /* Counts garbage chars received by TX */
static int tleft = 6; /* Counter for test mode */

junkcount = 0;
Beenhereb4 = FALSE;
somemore:
if (setjmp(intrjmp)) {
waitack:
junkcount = 0;
c = getinsync(0);
gotack:
switch (c) {
default:
case ZCAN:
fclose(in);
return ERROR;
case ZRINIT:
fclose(in);
return ZSKIP;
case ZSKIP:
fclose(in);
return c;
case ZACK:
case ZRPOS:
break;
}
#ifdef READCHECK
/*
* If the reverse channel can be tested for data,
* this logic may be used to detect error packets
* sent by the receiver, in place of setjmp/longjmp
* rdchk(Tty) returns non 0 if a character is available
*/
while (rdchk(Tty)) {
#ifdef EATSIT
switch (checked)
#else
switch (readline(1))
#endif
{
case CAN:
case ZPAD:
c = getinsync(1);
goto gotack;
case XOFF: /* Wait a while for an XON */
case XOFF|0200:
readline(100);
}
}
#endif
}

signal(SIGINT, onintr);
newcnt = Rxbuflen;
Txwcnt = 0;
stohdr(Txpos);
zsbhdr(4, ZDATA, Txhdr);

/*
* Special testing mode. This should force receiver to Attn,ZRPOS
* many times. Each time the signal should be caught, causing the
* file to be started over from the beginning.
*/
if (Test) {
if ( --tleft)
while (tcount < 20000) {
printf(qbf); fflush(stdout);
tcount += strlen(qbf);
#ifdef READCHECK
while (rdchk(Tty)) {
#ifdef EATSIT
switch (checked)
#else
switch (readline(1))
#endif
{
case CAN:
case ZPAD:
goto waitack;
case XOFF: /* Wait for XON */
case XOFF|0200:
readline(100);
}
}
#endif
}
signal(SIGINT, SIG_IGN); canit();
sleep(3); purgeline(); mode(0);
printf("\nsz: Tcount = %ld\n", tcount);
if (tleft) {
printf("ERROR: Interrupts Not Caught\n");
exit(1);
}
exit(0);
}

do {
n = zfilbuf();
if (Eofseen)
e = ZCRCE;
else if (junkcount > 3)
e = ZCRCW;
else if (bytcnt == Lastsync)
e = ZCRCW;
else if (Rxbuflen && (newcnt -= n) <= 0)
e = ZCRCW;
else if (Txwindow && (Txwcnt += n) >= Txwspac) {
Txwcnt = 0; e = ZCRCQ;
} else
e = ZCRCG;
if (Verbose>1)
fprintf(stderr, "\r%7ld ZMODEM%s ",
Txpos, Crc32t?" CRC-32":"");
zsdata(txbuf, n, e);
bytcnt = Txpos += n;
if (e == ZCRCW)
goto waitack;
#ifdef READCHECK
/*
* If the reverse channel can be tested for data,
* this logic may be used to detect error packets
* sent by the receiver, in place of setjmp/longjmp
* rdchk(Tty) returns non 0 if a character is available
*/
fflush(stdout);
while (rdchk(Tty)) {
#ifdef EATSIT
switch (checked)
#else
switch (readline(1))
#endif
{
case CAN:
case ZPAD:
c = getinsync(1);
if (c == ZACK)
break;
/* zcrce - dinna wanna starta ping-pong game */
zsdata(txbuf, 0, ZCRCE);
goto gotack;
case XOFF: /* Wait a while for an XON */
case XOFF|0200:
readline(100);
default:
++junkcount;
}
}
#endif /* READCHECK */
if (Txwindow) {
while ((tcount = (Txpos - Lrxpos)) >= Txwindow) {
vfile("%ld window >= %u", tcount, Txwindow);
if (e != ZCRCQ)
zsdata(txbuf, 0, e = ZCRCQ);
c = getinsync(1);
if (c != ZACK) {
zsdata(txbuf, 0, ZCRCE);
goto gotack;
}
}
vfile("window = %ld", tcount);
}
} while (!Eofseen);
signal(SIGINT, SIG_IGN);

if (Lrxpos != Txpos)
n = Unlinkafter | Txwindow;
else
n = 0;
for (;;) {
stohdr(Txpos);
if (n) {
zsbhdr(4, ZDATA, Txhdr);
zsdata(txbuf, 0, ZCRCW);
} else
zsbhdr(4, ZEOF, Txhdr);
switch (getinsync(0)) {
case ZACK:
n = 0; continue;
case ZNAK:
continue;
case ZRPOS:
goto somemore;
case ZRINIT:
fclose(in);
return OK;
case ZSKIP:
fclose(in);
sprintf(endmsg, "File skipped by receiver request");
return c;
default:
sprintf(endmsg, "Got %d trying to send end of file", c);
case ERROR:
fclose(in);
return ERROR;
}
}
}

/*
* Respond to receiver's complaint, get back in sync with receiver
*/
getinsync(flag)
{
register c;

for (;;) {
if (Test) {
printf("\r\n\n\n***** Signal Caught *****\r\n");
Rxpos = 0; c = ZRPOS;
} else
c = zgethdr(Rxhdr, 0);
switch (c) {
case ZCAN:
case ZABORT:
case ZFIN:
case TIMEOUT:
sprintf(endmsg, "Got %s sending data", frametypes[c+FTOFFSET]);
return ERROR;
case ZRPOS:
if (Rxpos > bytcnt) {
sprintf(endmsg, "Nonstandard Protocol");
return ZRPOS;
}
/* ************************************* */
/* If sending to a buffered modem, you */
/* might send a break at this point to */
/* dump the modem's buffer. */
clearerr(in); /* In case file EOF seen */
if (fseek(in, Rxpos, 0)) {
sprintf(endmsg, "Bad Seek");
return ERROR;
}
Eofseen = 0;
bytcnt = Lrxpos = Txpos = Rxpos;
if (Lastsync == Rxpos) {
if (++Beenhereb4 > 12) {
sprintf(endmsg, "Can't send block");
return ERROR;
}
if (Beenhereb4 > 4)
if (blklen > 32)
blklen /= 2;
}
Lastsync = Rxpos;
return c;
case ZACK:
Lrxpos = Rxpos;
if (flag || Txpos == Rxpos)
return ZACK;
continue;
case ZRINIT:
return c;
case ZSKIP:
sprintf(endmsg, "File skipped by receiver request");
return c;
case ERROR:
default:
zsbhdr(4, ZNAK, Txhdr);
continue;
}
}
}


/* Send command and related info */
zsendcmd(buf, blen)
char *buf;
{
register c;
long cmdnum;

cmdnum = getpid();
errors = 0;
for (;;) {
stohdr(cmdnum);
Txhdr[ZF0] = Cmdack1;
zsbhdr(4, ZCOMMAND, Txhdr);
zsdata(buf, blen, ZCRCW);
listen:
Rxtimeout = 100; /* Ten second wait for resp. */
Usevhdrs = 0; /* Allow rx to send fixed len headers */
c = zgethdr(Rxhdr, 1);

switch (c) {
case ZRINIT:
goto listen; /* CAF 8-21-87 */
case ERROR:
case GCOUNT:
case TIMEOUT:
if (++errors > Cmdtries)
return ERROR;
continue;
case ZCAN:
case ZABORT:
case ZFIN:
case ZSKIP:
case ZRPOS:
return ERROR;
default:
if (++errors > 20)
return ERROR;
continue;
case ZCOMPL:
Exitcode = Rxpos;
saybibi();
return OK;
case ZRQINIT:
vfile("******** RZ *******");
system("rz");
vfile("******** SZ *******");
goto listen;
}
}
}

/*
* If called as sb use YMODEM protocol
*/
chkinvok(s)
char *s;
{
register char *p;

p = s;
while (*p == '-')
s = ++p;
while (*p)
if (*p++ == '/')
s = p;
if (*s == 'v') {
Verbose=1; ++s;
}
Progname = s;
if (s[0]=='z' && s[1] == 'c') {
Command = TRUE;
if (s[8] == 'i')
Cmdack1 = ZCACK1;
}
if (s[0]=='s' && s[1]=='b') {
Nozmodem = TRUE; blklen=1024;
}
if (s[0]=='s' && s[1]=='x') {
Modem2 = TRUE;
}
}

countem(argc, argv)
register char **argv;
{
register c;
struct stat f;

for (Totalleft = 0, Filesleft = 0; --argc >=0; ++argv) {
f.st_size = -1;
if (Verbose>2) {
fprintf(stderr, "\nCountem: %03d %s ", argc, *argv);
fflush(stderr);
}
if (access(*argv, 04) >= 0 && stat(*argv, &f) >= 0) {
++Filesleft; Totalleft += f.st_size;
}
if (Verbose>2)
fprintf(stderr, " %ld", f.st_size);
}
if (Verbose>2)
fprintf(stderr, "\ncountem: Total %d %ld\n",
Filesleft, Totalleft);
}

chartest(m)
{
register n;

mode(m);
printf("\r\n\nCharacter Transparency Test Mode %d\r\n", m);
printf("If Pro-YAM/ZCOMM is not displaying ^M hit ALT-V NOW.\r\n");
printf("Hit Enter.\021"); fflush(stdout);
readline(500);

for (n = 0; n < 256; ++n) {
if (!(n%8))
printf("\r\n");
printf("%02x ", n); fflush(stdout);
sendline(n); flushmo();
printf(" "); fflush(stdout);
if (n == 127) {
printf("Hit Enter.\021"); fflush(stdout);
readline(500);
printf("\r\n"); fflush(stdout);
}
}
printf("\021\r\nEnter Characters, echo is in hex.\r\n");
printf("Hit SPACE or pause 40 seconds for exit.\r\n");

while (n != TIMEOUT && n != ' ') {
n = readline(400);
printf("%02x\r\n", n);
fflush(stdout);
}
printf("\r\nMode %d character transparency test ends.\r\n", m);
fflush(stdout);
}

/* End of sz.c */