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sz.c
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#define VERSION "3.48 01-27-98"
#define PUBDIR "/usr/spool/uucppublic"
/*
**************************************************************************
*
* sz.c By Chuck Forsberg, Omen Technology INC
* Copyright 1997 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. "Didactic" means it is used as a study item
* in a course teaching the workings of computer protocols.
*
* This software may also be freely used to support file transfer
* operations to or from duly licensed Omen Technology products.
* This includes DSZ, GSZ, ZCOMM, Professional-YAM and PowerCom.
* Institutions desiring to use rz/sz this way should add the
* following to the sz compile line: -DCOMPL
* Programs based on stolen or public domain ZMODEM materials are
* not included. Use with other commercial or shareware programs
* (Crosstalk, Procomm, etc.) REQUIRES REGISTRATION.
*
*
* Any programs which incorporate part or all of this code must be
* provided in source form with this notice intact except by
* prior written permission from Omen Technology Incorporated.
* This includes compiled executables of this program.
*
* The .doc files and the file "mailer.rz" must also be included.
*
* Use of this software for commercial or administrative purposes
* except when exclusively limited to interfacing Omen Technology
* products requires license payment of $20.00 US per user
* (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 1997 Omen Technology Inc All Rights Reserved";
char *substr();
#define LOGFILE "/tmp/szlog"
#define LOGFILE2 "szlog"
#include <stdio.h>
#include <signal.h>
#include <ctype.h>
#include <errno.h>
extern int errno;
#define STATIC
#define PATHLEN 1000
#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 SYN 026
#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 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 long Lrxpos; /* Receiver's last reported offset */
STATIC int errors;
char endmsg[80] = {0}; /* Possible message to display on exit */
char Zsendmask[33]; /* Additional control chars to mask */
#include "rbsb.c" /* most of the system dependent stuff here */
#include "crctab.c"
STATIC int Filesleft;
STATIC 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) */
#ifndef SMALL
#ifndef TXBSIZE
#define TXBSIZE 32768
#endif
#define TXBMASK (TXBSIZE-1)
STATIC char Txb[TXBSIZE + 1024]; /* Circular buffer for file reads */
STATIC char *txbuf = Txb; /* Pointer to current file segment */
#else
char txbuf[1024];
#endif
STATIC 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 Skipbitch=0;
STATIC int Skipcount=0; /* Count of skipped files */
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 long Tframlen = 0; /* Override for tx frame length */
STATIC int blkopt=0; /* Override value for zmodem blklen */
STATIC int Rxflags = 0;
STATIC long bytcnt, maxbytcnt;
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 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 long Lastsync; /* Last offset to which we got a ZRPOS */
STATIC int Beenhereb4; /* How many times we've been ZRPOS'd here */
STATIC int Ksendstr; /* 1= Send esc-?-3-4-l to remote kermit */
STATIC char *ksendbuf = "\033[?34l";
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
*/
void
zperr1(s,p,u)
char *s, *p, *u;
{
if (Verbose <= 0)
return;
fprintf(stderr, "Retry %d: ", errors);
fprintf(stderr, s);
fprintf(stderr, "\n");
}
void
zperr2(s,p,u)
char *s, *p, *u;
{
if (Verbose <= 0)
return;
fprintf(stderr, "Retry %d: ", errors);
fprintf(stderr, s, p);
fprintf(stderr, "\n");
}
void
zperr3(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;
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) {
if (isdigit(*cp)) {
++cp; continue;
}
switch(*cp++) {
case '\\':
*cp = toupper(*cp); continue;
case '+':
Lzmanag = ZMAPND; break;
case 'a':
if (Nozmodem || Modem2)
usage();
Lzconv = ZCNL; break;
case 'b':
Lzconv = ZCBIN; break;
case 'c':
Lzmanag = ZMCHNG; break;
case 'd':
++Dottoslash;
/* **** FALL THROUGH TO **** */
case 'f':
Fullname=TRUE; break;
case 'g' :
Ksendstr = TRUE; break;
case 'e':
Zctlesc = 1; break;
case 'k':
blklen=1024; break;
case 'L':
if (isdigit(*cp))
blkopt = atoi(cp);
else {
if (--argc < 1)
usage();
blkopt = atoi(*++argv);
}
if (blkopt<24 || blkopt>1024)
usage();
break;
case 'l':
if (isdigit(*cp))
Tframlen = atol(cp);
else {
if (--argc < 1)
usage();
Tframlen = atol(*++argv);
}
if (Tframlen<32 || Tframlen>65535L)
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':
chartest(1); chartest(2);
mode(0); exit(0);
case 'u':
++Unlinkafter; break;
case 'v':
++Verbose; break;
case 'w':
if (isdigit(*cp))
Txwindow = atoi(cp);
else {
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':
Skipbitch = 1; 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 tty=%s\n", Progname, VERSION, OS, Nametty);
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
countem(npats, patts);
if (!Modem2 && !Nozmodem) {
if (Ksendstr)
printf(ksendbuf);
printf("rz\r"); fflush(stdout);
stohdr(0x80L); /* Show we can var header */
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();
sleep(20);
}
if (Skipcount) {
printf("%d file(s) skipped by receiver request\r\n", Skipcount);
if (Verbose) fprintf(stderr,
"%d file(s) skipped by receiver request\r\n", Skipcount);
}
if (endmsg[0]) {
printf("\r\n%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\n**** UNREGISTERED COPY *****\r\n");
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)) {
case ZFIN:
sendline('O'); sendline('O'); flushmo();
case ZCAN:
case TIMEOUT:
return;
}
}
}
wcsend(argc, argp)
char *argp[];
{
register n;
Crcflg=FALSE;
firstsec=TRUE;
bytcnt = maxbytcnt = -1;
vfile("wcsend: argc=%d", argc);
if (Nozmodem) {
printf("Start your local YMODEM receive. ");
fflush(stdout);
}
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 (!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;
struct stat f;
char name[PATHLEN];
strcpy(name, oname);
vfile("wcs: name=%s", name);
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;
}
}
#ifdef TXBSIZE
if ( !strcmp(name, "-")) {
if ((p = getenv("ONAME")) && *p)
strcpy(name, p);
else
sprintf(name, "s%d.sz", getpid());
in = stdin;
}
else
#endif
in=fopen(name, "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;
vfile("wctxpn: %s", name);
if (Modem2) {
if (*name && fstat(fileno(in), &f)!= -1) {
fprintf(stderr, "Sending %s, %ld XMODEM blocks. ",
name, (127+f.st_size)>>7);
}
printf("Start your local XMODEM receive. ");
fflush(stdout);
return OK;
}
zperr2("Awaiting pathname nak for %s", *name?name:"<END>");
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 3 %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;
}
vfile("wctxpn: %s", p);
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)
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=readline(Rxtimeout))!=NAK && firstch != WANTCRC
&& firstch != WANTG && firstch!=TIMEOUT && firstch!=CAN)
;
if (firstch==CAN) {
zperr1("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) {
zperr1("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>1)
fprintf(stderr, "Sector %3d %2dk\n", 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:
zperr1("Cancelled"); return ERROR;
}
break;
case TIMEOUT:
zperr1("Timeout on sector ACK"); continue;
case WANTCRC:
if (firstsec)
Crcflg = TRUE;
case NAK:
zperr1("NAK on sector"); continue;
case ACK:
firstsec=FALSE;
Totsecs += (cseclen>>7);
return OK;
case ERROR:
zperr1("Got burst for sector ACK"); break;
default:
zperr2("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;
}
}
zperr1("Retry Count Exceeded");
return ERROR;
}
/* fill buf with count chars padding with ^Z for CPM */
filbuf(buf, count)
register char *buf;
{
register 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;
vfile("zfilbuf: n=%d vpos=%lu Eofseen=%d", n, vpos, Eofseen);
}
return n;
#endif
}
#ifdef TXBSIZE
/* Replacement for brain damaged fseek function. Returns 0==success */
fooseek(fptr, pos, whence)
FILE *fptr;
long pos;
{
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;
vfile("seek to vpos=%ld", vpos);
if (fseek(fptr, vpos, 0))
return 1;
}
else if (Canseek == 0) {
vfile("seek to 00000");
if (fseek(fptr, vpos = 0L, 0))
return 1;
} else
return 1;
while (vpos < pos) {
n = fread(Txb, (size_t)1, (size_t)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, (size_t)1, (size_t)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 [-+abcdefgklLnNuvwxyYZ] [-] file ...",
"\t zcommand [-egv] COMMAND",
"\t zcommandi [-egv] COMMAND",
"\t sb [-adfkuv] [-] file ...",
"\t sx [-akuv] [-] 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");