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- /*
- * 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 after %d seconds\n", seconds);
- 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 (MOREDEBUG)
- fprintf(LOGFP, "DEBUG: character read %02xh\n", c & 0xff);
-
- 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)
- {
- logit("Can't flush terminal queue\n");
- tlogit("Can't flush terminal queue\n");
- }
-
- 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);
- }
-