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Usenet 1994 October
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usenetsourcesnewsgroupsinfomagicoctober1994disk2.iso
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unix
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volume23
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xmodem3.9
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part02
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getput.c
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C/C++ Source or Header
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1991-01-08
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12KB
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463 lines
/*
* Contains system routines to get and put bytes, change tty modes, etc
* Most of the routines are VERY 4.2BSD Specific!!!
*/
#include "xmodem.h"
/*
*
* Get a byte from the specified file. Buffer the read so we don't
* have to use a system call for each character.
*
*/
getbyte(fildes, ch) /* Buffered disk read */
int fildes;
char *ch;
{
static char buf[BUFSIZ]; /* Remember buffer */
static char *bufp = buf; /* Remember where we are in buffer */
if (nbchr == 0) /* Buffer exausted; read some more */
{
if ((nbchr = read(fildes, buf, BUFSIZ)) < 0)
error("File Read Error", TRUE);
bufp = buf; /* Set pointer to start of array */
}
if (--nbchr >= 0)
{
*ch = *bufp++;
return(0);
}
else
{
return(EOF);
}
}
/* Count the number of newlines in a file so we know the REAL file size */
long
countnl(fd)
int fd;
{
char buf[BUFSIZ];
char *bufp;
long nltot = 0;
int numchar;
long lseek();
while (numchar = read(fd, buf, BUFSIZ)) /* cycle through file */
for (bufp=buf; numchar--; bufp++)
if (*bufp == '\n')
nltot++;
(void) lseek (fd, 0l, 0); /* rewind file */
if (DEBUG)
fprintf(LOGFP, "DEBUG: countnl--%ld newlines counted\n", nltot);
return (nltot);
}
/* CRC-16 constant array...
from Usenet contribution by Mark G. Mendel, Network Systems Corp.
(ihnp4!umn-cs!hyper!mark)
*/
/* crctab as calculated by initcrctab() */
unsigned short crctab[1<<B] = {
0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50a5, 0x60c6, 0x70e7,
0x8108, 0x9129, 0xa14a, 0xb16b, 0xc18c, 0xd1ad, 0xe1ce, 0xf1ef,
0x1231, 0x0210, 0x3273, 0x2252, 0x52b5, 0x4294, 0x72f7, 0x62d6,
0x9339, 0x8318, 0xb37b, 0xa35a, 0xd3bd, 0xc39c, 0xf3ff, 0xe3de,
0x2462, 0x3443, 0x0420, 0x1401, 0x64e6, 0x74c7, 0x44a4, 0x5485,
0xa56a, 0xb54b, 0x8528, 0x9509, 0xe5ee, 0xf5cf, 0xc5ac, 0xd58d,
0x3653, 0x2672, 0x1611, 0x0630, 0x76d7, 0x66f6, 0x5695, 0x46b4,
0xb75b, 0xa77a, 0x9719, 0x8738, 0xf7df, 0xe7fe, 0xd79d, 0xc7bc,
0x48c4, 0x58e5, 0x6886, 0x78a7, 0x0840, 0x1861, 0x2802, 0x3823,
0xc9cc, 0xd9ed, 0xe98e, 0xf9af, 0x8948, 0x9969, 0xa90a, 0xb92b,
0x5af5, 0x4ad4, 0x7ab7, 0x6a96, 0x1a71, 0x0a50, 0x3a33, 0x2a12,
0xdbfd, 0xcbdc, 0xfbbf, 0xeb9e, 0x9b79, 0x8b58, 0xbb3b, 0xab1a,
0x6ca6, 0x7c87, 0x4ce4, 0x5cc5, 0x2c22, 0x3c03, 0x0c60, 0x1c41,
0xedae, 0xfd8f, 0xcdec, 0xddcd, 0xad2a, 0xbd0b, 0x8d68, 0x9d49,
0x7e97, 0x6eb6, 0x5ed5, 0x4ef4, 0x3e13, 0x2e32, 0x1e51, 0x0e70,
0xff9f, 0xefbe, 0xdfdd, 0xcffc, 0xbf1b, 0xaf3a, 0x9f59, 0x8f78,
0x9188, 0x81a9, 0xb1ca, 0xa1eb, 0xd10c, 0xc12d, 0xf14e, 0xe16f,
0x1080, 0x00a1, 0x30c2, 0x20e3, 0x5004, 0x4025, 0x7046, 0x6067,
0x83b9, 0x9398, 0xa3fb, 0xb3da, 0xc33d, 0xd31c, 0xe37f, 0xf35e,
0x02b1, 0x1290, 0x22f3, 0x32d2, 0x4235, 0x5214, 0x6277, 0x7256,
0xb5ea, 0xa5cb, 0x95a8, 0x8589, 0xf56e, 0xe54f, 0xd52c, 0xc50d,
0x34e2, 0x24c3, 0x14a0, 0x0481, 0x7466, 0x6447, 0x5424, 0x4405,
0xa7db, 0xb7fa, 0x8799, 0x97b8, 0xe75f, 0xf77e, 0xc71d, 0xd73c,
0x26d3, 0x36f2, 0x0691, 0x16b0, 0x6657, 0x7676, 0x4615, 0x5634,
0xd94c, 0xc96d, 0xf90e, 0xe92f, 0x99c8, 0x89e9, 0xb98a, 0xa9ab,
0x5844, 0x4865, 0x7806, 0x6827, 0x18c0, 0x08e1, 0x3882, 0x28a3,
0xcb7d, 0xdb5c, 0xeb3f, 0xfb1e, 0x8bf9, 0x9bd8, 0xabbb, 0xbb9a,
0x4a75, 0x5a54, 0x6a37, 0x7a16, 0x0af1, 0x1ad0, 0x2ab3, 0x3a92,
0xfd2e, 0xed0f, 0xdd6c, 0xcd4d, 0xbdaa, 0xad8b, 0x9de8, 0x8dc9,
0x7c26, 0x6c07, 0x5c64, 0x4c45, 0x3ca2, 0x2c83, 0x1ce0, 0x0cc1,
0xef1f, 0xff3e, 0xcf5d, 0xdf7c, 0xaf9b, 0xbfba, 0x8fd9, 0x9ff8,
0x6e17, 0x7e36, 0x4e55, 0x5e74, 0x2e93, 0x3eb2, 0x0ed1, 0x1ef0
};
/* get a byte from data stream -- timeout if "seconds" elapses */
/* This routine is VERY 4.2 specific */
int
readbyte(seconds)
int seconds;
{
int readfd;
char c;
struct timeval tmout;
tmout.tv_sec = seconds;
tmout.tv_usec = 0;
readfd = 1<<0;
if ((select(1, &readfd, (int *)0, (int *)0, &tmout)) == 0)
{
if (DEBUG)
fprintf(LOGFP, "DEBUG: readbyte TIMEOUT\n");
return(TIMEOUT);
}
read(0, &c, 1);
if (DEBUG)
fprintf(LOGFP, "DEBUG: readbyte %02xh\n", c & 0xff);
return(c & 0xff); /* return the char */
}
/* flush input stream by reading pending characters */
flushin()
{
int readfd;
char inbuf[BBUFSIZ];
struct timeval tmout;
/* set up a usec timeout on stdin */
tmout.tv_sec = 0;
tmout.tv_usec = 1;
readfd = 1<<0;
/* any characters pending?; return if none */
if ((select(1, &readfd, (int *)0, (int *)0, &tmout)) == 0)
return;
/* read the characters to flush them (assume there are fewer than BBUFSIZ */
(void) read(0, inbuf, BBUFSIZ);
}
/*
get a buffer (length bufsize) from data stream -- timeout if "seconds" elapses.
Read bunches of characters to save system overhead;
Further process data while kernel is reading stream (calculating "checksum").
Try to nap long enough so kernel collects 100 characters or so until we wake up
unless TOOBUSY is set.
*/
/* This routine is VERY 4.2 specific */
int
readbuf(bufsize, seconds, tmode, amode, recvsectcnt, checksum, bufctr)
int bufsize, /* number of chars to be read */
seconds, /* timeout period for each read */
tmode, /* transmission mode: TRUE if text */
amode, /* transmission mode: TRUE if apple macintosh */
*checksum, /* pointer to checksum value */
*bufctr; /* length of actual data string in buffer */
long recvsectcnt; /* running sector count (128 byte sectors) */
{
int readfd; /* mask for select call */
struct timeval tmout; /* timeout structure for select */
int numread; /* number of chars read */
int left; /* number of chars left to read */
int recfin = FALSE; /* flag that EOF read */
char inbuf[BBUFSIZ]; /* buffer for incoming packet */
register unsigned char c; /* character being processed */
register unsigned short chksm; /* working copy of checksum */
register int bfctr; /* working copy of bufctr */
int j; /* loop index */
char *sectdisp();
tmout.tv_sec = seconds;
tmout.tv_usec = 0;
readfd = 1<<0;
chksm = 0;
bfctr = 0;
for (left = bufsize; left > 0;) {
/* read however many chars are waiting */
if ((select(1, &readfd, (int *)0, (int *)0, &tmout)) == 0)
return(TIMEOUT);
numread = read(0, inbuf, left);
left -= numread;
if (DEBUG)
fprintf(LOGFP, "DEBUG: readbuf--read %d characters\n", numread);
/* now process part of packet we just read */
for (j = 0; j < numread; j++)
{
buff[bfctr] = c = inbuf[j] & 0xff;
fileread++;
if (CRCMODE) /* CRC */
chksm = (chksm<<B) ^ crctab[(chksm>>(W-B)) ^ c];
else /* checksum */
chksm = ((chksm+c) & 0xff);
if (CHECKLENGTH && fileread > filelength) /* past EOF ? */
continue;
if (tmode) /* text mode processing */
{
buff[bfctr] &= 0x7f; /* nuke bit 8 */
if (c == CR || c == 0) /* skip CRs and nulls */
continue;
else if (c == CTRLZ) /* CP/M EOF char */
{
recfin = TRUE;
continue;
}
else if (!recfin) /* don't increment if past EOF */
bfctr++;
}
else if (amode) /* Apple macintosh text mode processing */
{
buff[bfctr] &= 0x7f; /* nuke bit 8 */
if (c == 0) /* skip nulls */
continue;
else if (c == CR) /* translate CR to LF */
buff[bfctr] = LF;
else if (c == CTRLZ) /* CP/M EOF char */
{
recfin = TRUE;
continue;
}
if (!recfin) /* don't increment if past EOF */
bfctr++;
}
else /* binary */
bfctr++;
}
/* go to sleep to save uneeded system calls while kernel
is reading data from serial line;
fudge constant from 10000 to 9000 to avoid sleeping too long.
*/
if (left && !TOOBUSY)
napms( (left<SLEEPNUM ? left:SLEEPNUM) * 9000/ttyspeed);
}
if (CHECKLENGTH && fileread >= filelength)
logitarg("File end from YMODEM length found in sector %s\n",
sectdisp(recvsectcnt,bufsize,1));
*checksum = chksm;
*bufctr = bfctr;
return(0);
}
/* send a byte to data stream */
sendbyte(data)
char data;
{
if (DEBUG)
fprintf(LOGFP, "DEBUG: sendbyte %02xh\n", data & 0xff);
if (write(1, &data, 1) != 1) /* write the byte (assume it goes NOW; no flushing needed) */
error ("Write error on stream", TRUE);
return;
}
/* send a buffer to data stream */
writebuf(buffer, nbytes)
char *buffer;
int nbytes;
{
if (DEBUG)
fprintf(LOGFP, "DEBUG: writebuf (%d bytes)\n", nbytes);
if (write(1, buffer, nbytes) != nbytes) /* write the buffer (assume no TIOCFLUSH needed) */
error ("Write error on stream", TRUE);
return;
}
/*
* "nap" for specified time -- VERY 4.2BSD specific
*/
napms (milliseconds)
int milliseconds;
{
struct timeval timeout;
int readfd;
if (milliseconds == 0)
return;
if (DEBUG)
fprintf (LOGFP, "DEBUG: napping for %d ms\n", milliseconds);
timeout.tv_sec = 0;
timeout.tv_usec = milliseconds * 1000;
readfd = 0;
(void) select(1, &readfd, (int *)0, (int *)0, &timeout);
}
/* set and restore tty modes for XMODEM transfers */
/* These routines are 4.2/v7(?) specific */
struct sgttyb ttys, ttysnew; /* for stty terminal mode calls */
struct stat statbuf; /* for terminal message on/off control */
int wason; /* holds status of tty read write/modes */
char *tty; /* current tty name */
setmodes()
{
char *ttyname();
int n;
extern onintr();
sleep(2); /* let the output appear */
if (ioctl(0,TIOCGETP,&ttys)<0) /* get tty params [V7] */
error("Can't get TTY Parameters", TRUE);
tty = ttyname(0); /* identify current tty */
ttysnew.sg_ispeed = ttys.sg_ispeed; /* copy input speed */
ttysnew.sg_ospeed = ttys.sg_ospeed; /* copy input speed */
ttysnew.sg_flags |= RAW; /* set for RAW Mode */
ttysnew.sg_flags &= ~ECHO; /* set for no echoing */
ttysnew.sg_flags &= ~TANDEM; /* turn off flow control */
/* set new paramters */
if (ioctl(0,TIOCSETP,&ttysnew) < 0)
error("Can't set new TTY Parameters", TRUE);
/* Flush characters waiting for read or write */
n = 0;
if (ioctl(0,TIOCFLUSH,&n) < 0)
error("Can't flush terminal queue", TRUE);
if (stat(tty, &statbuf) < 0) /* get tty modes */
{
logit("Can't get your TTY Status\n");
tlogit("Can't get your TTY Status\n");
wason = FALSE;
}
else
{
if (statbuf.st_mode & 022)
{
if (chmod(tty, (int)statbuf.st_mode & ~022) < 0)
{
logit("Can't change TTY mode\n");
tlogit("Can't change TTY mode\n");
wason = FALSE;
}
else
wason = TRUE;
}
else
wason = FALSE;
}
/* set up signal catcher to restore tty state if we are KILLed */
if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
signal(SIGTERM, onintr);
}
/* restore normal tty modes */
restoremodes(errcall)
int errcall;
{
if (wason)
if (chmod(tty, (int)statbuf.st_mode | 022) < 0)
error("Can't change TTY mode", FALSE);
if (ioctl(0,TIOCSETP,&ttys) < 0)
{ if (!errcall)
error("RESET - Can't restore normal TTY Params", FALSE);
else
printf("RESET - Can't restore normal TTY Params\n");
}
if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
signal(SIGTERM, SIG_DFL);
return;
}
/* signal catcher */
onintr()
{
error("Kill signal; bailing out", TRUE);
}
/* create string with a timestamp for log file */
char *stamptime()
{
char *asctime(); /* stuff to get timestamp */
struct tm *localtime(), *tp;
struct timeval tv;
struct timezone tz;
gettimeofday (&tv, &tz); /* fill in timestamp */
tp = localtime ((time_t *)&tv.tv_sec);
return(asctime(tp));
}
/* get tty speed for time estimates */
getspeed()
{
static int speedtbl[] = {0, 50, 75, 110, 134, 150, 200, 300, 600,
1200, 1800, 2400, 4800, 9600, 19200, 0};
if (ioctl(0,TIOCGETP,&ttys) < 0) /* get tty structure */
error("Can't get TTY parameters", FALSE);
if (ttys.sg_ispeed >= 0 && ttys.sg_ispeed <= 14)
{
ttyspeed = speedtbl[ttys.sg_ispeed];
logitarg ("Line speed = %d bits per second\n", ttyspeed);
}
else
{
ttyspeed = 1200;
logit ("Can't determine line speed; assuming 1200 bps\n");
}
}
/* turn off keyboard stop signal so stray ^X don't put us in background */
stopsig()
{
signal(SIGTSTP, SIG_IGN);
}