/*% shar zmodem.h zm.c sz.c>/tmp/rzsz1.sh;shar rz.c rbsb.c rz.1 sz.1 gz>/tmp/rzsz2.sh
 * -rev 08-17-86
 * mode function and most of the rest of the system dependent
 * stuff for rb.c and sb.c   This file is #included so the includer
 * can set parameters such as HOWMANY.  See the main file (rz.c/sz.c)
 * for compile instructions.
 */

#ifdef V7
#include <sys/types.h>
#include <sys/stat.h>
#include <sgtty.h>
#define OS "V7/BSD"
#endif

#ifndef OS
#ifndef USG
#define USG
#endif
#endif

#ifdef USG
#include <sys/types.h>
#include <sys/stat.h>
#include <termio.h>
#include <sys/ioctl.h>
#define OS "SYS III/V"
#endif


struct {
	unsigned baudr;
	int speedcode;
} speeds[] = {
	110,	B110,
	300,	B300,
	600,	B600,
	1200,	B1200,
	2400,	B2400,
	4800,	B4800,
	9600,	B9600,
	19200,	EXTA,
	9600,	EXTB,
	0,
};

int Twostop;		/* Use two stop bits */

static unsigned
getspeed(code)
{
	register n;

	for (n=0; speeds[n].baudr; ++n)
		if (speeds[n].speedcode == code)
			return speeds[n].baudr;
	return 0;
}



#ifdef ICANON
struct termio oldtty, tty;
#else
struct sgttyb oldtty, tty;
struct tchars oldtch, tch;
#endif

int iofd = 0;		/* File descriptor for ioctls & reads */

/*
 * mode(n)
 *  2: set a cbreak, XON/XOFF control mode if using Pro-YAM's -g option
 *  1: save old tty stat, set raw mode 
 *  0: restore original tty mode
 */
mode(n)
{
	static did0 = FALSE;

	vfile("mode:%d", n);
	switch(n) {
#ifdef USG
	case 2:	/* Cbreak mode used by sb when -g detected */
		if(!did0)
			(void) ioctl(iofd, TCGETA, &oldtty);
		tty = oldtty;

		tty.c_iflag = BRKINT|IXON;

		tty.c_oflag = 0;	/* Transparent output */

		tty.c_cflag &= ~PARENB;	/* Disable parity */
		tty.c_cflag |= CS8;	/* Set character size = 8 */
		if (Twostop)
			tty.c_cflag |= CSTOPB;	/* Set two stop bits */

#ifdef XCLUDE
		tty.c_lflag = XCLUDE | ISIG;
#else
		tty.c_lflag = ISIG;
#endif

		tty.c_cc[VINTR] = Zmodem ? 03:030;	/* Interrupt char */
		tty.c_cc[VMIN] = 1;

		(void) ioctl(iofd, TCSETAW, &tty);
		did0 = TRUE;
		return OK;
	case 1:
		if(!did0)
			(void) ioctl(iofd, TCGETA, &oldtty);
		tty = oldtty;

		tty.c_iflag = IGNBRK;

		 /* No echo, crlf mapping, INTR, QUIT, delays, no erase/kill */
		tty.c_lflag &= ~(ECHO | ICANON | ISIG);
#ifdef XCLUDE
		tty.c_lflag |= XCLUDE;
#endif

		tty.c_oflag = 0;	/* Transparent output */

		tty.c_cflag &= ~PARENB;	/* Leave baud rate alone, disable parity */
		tty.c_cflag |= CS8;	/* Set character size = 8 */
		if (Twostop)
			tty.c_cflag |= CSTOPB;	/* Set two stop bits */
		tty.c_cc[VMIN] = HOWMANY; /* Satisfy reads when this many chars in */
		tty.c_cc[VTIME] = 1;	/* ... or in this many tenths of seconds */
		(void) ioctl(iofd, TCSETAW, &tty);
		did0 = TRUE;
		Baudrate = getspeed(tty.c_cflag & CBAUD);
		return OK;
#endif
#ifdef V7
	case 2:	/*  This doesn't work ... */
		printf("No mode(2) in V7/BSD!"); bibi(99);
		if(!did0) {
			ioctl(iofd, TIOCEXCL, 0);
			ioctl(iofd, TIOCGETP, &oldtty);
			ioctl(iofd, TIOCGETC, &oldtch);
		}
		tty = oldtty;
		tch = oldtch;
		tch.t_intrc = Zmodem ? 03:030;	/* Interrupt char */
		tty.sg_flags |= (ODDP|EVENP|CBREAK);
		tty.sg_flags &= ~(ALLDELAY|CRMOD|ECHO|LCASE);
		ioctl(iofd, TIOCSETP, &tty);
		ioctl(iofd, TIOCSETC, &tch);
		did0 = TRUE;
		return OK;
	case 1:
		if(!did0) {
			ioctl(iofd, TIOCEXCL, 0);
			ioctl(iofd, TIOCGETP, &oldtty);
			ioctl(iofd, TIOCGETC, &oldtch);
		}
		tty = oldtty;
		tty.sg_flags |= RAW;
		tty.sg_flags &= ~ECHO;
		ioctl(iofd, TIOCSETP, &tty);
		did0 = TRUE;
		Baudrate = getspeed(tty.sg_ospeed);
		return OK;
#endif
	case 0:
		if(!did0)
			return ERROR;
#ifdef USG
		(void) ioctl(iofd, TCSBRK, 1);	/* Wait for output to drain */
		(void) ioctl(iofd, TCFLSH, 1);	/* Flush input queue */
		(void) ioctl(iofd, TCSETAW, &oldtty);	/* Restore original modes */
		(void) ioctl(iofd, TCXONC,1);	/* Restart output */
#endif
#ifdef V7
		ioctl(iofd, TIOCSETP, &oldtty);
		ioctl(iofd, TIOCSETC, &oldtch);
		ioctl(iofd, TIOCNXCL, 0);
#endif
		return OK;
	default:
		return ERROR;
	}
}

sendbrk()
{
#ifdef V7
#ifdef TIOCSBRK
#define CANBREAK
	sleep(1);
	ioctl(iofd, TIOCSBRK, 0);
	sleep(1);
	ioctl(iofd, TIOCCBRK, 0);
#endif
#endif
#ifdef USG
#define CANBREAK
	ioctl(iofd, TCSBRK, 0);
#endif
}

#ifdef FIONREAD
#define READCHECK
/*
 *  Return non 0 iff something to read from io descriptor f
 */
rdchk(f)
{
	static long lf;

	ioctl(f, FIONREAD, &lf);
	return ((int) lf);
}
#endif

#ifdef CRCTABLE
/* crctab calculated by Mark G. Mendel, Network Systems Corporation */
static unsigned short crctab[256] = {
    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
};

/*
 * updcrc macro derived from article Copyright (C) 1986 Stephen Satchell. 
 *  NOTE: First srgument must be in range 0 to 255.
 *        Second argument is referenced twice.
 * 
 * Programmers may incorporate any or all code into their programs, 
 * giving proper credit within the source. Publication of the 
 * source routines is permitted so long as proper credit is given 
 * to Stephen Satchell, Satchell Evaluations and Chuck Forsberg, 
 * Omen Technology.
 */

#define updcrc(cp, crc) ( crctab[((crc >> 8) & 255)] ^ (crc << 8) ^ cp)

#else

unsigned short updcrc();

/* update CRC */
unsigned short
updcrc(c, crc)
register c;
register unsigned crc;
{
	register count;

	for (count=8; --count>=0;) {
		if (crc & 0x8000) {
			crc <<= 1;
			crc += (((c<<=1) & 0400)  !=  0);
			crc ^= 0x1021;
		}
		else {
			crc <<= 1;
			crc += (((c<<=1) & 0400)  !=  0);
		}
	}
	return crc;	
}
#endif

/* End of rbsb.c */