/* termio.c	(MicroEmacs) */

/*
 * The functions in this file negotiate	with the operating system for
 * characters, and write characters in a barely	buffered fashion on the	display.
 * All operating systems.
 */
#include	<stdio.h>
#include        "ed.h"

#ifdef	AMIGA
#define	NEW 1006
#define	LEN 1

static long terminal;
#endif

#ifdef RSX
#define	NOBUF	64
char	obuf[NOBUF];			/* Output buffer		*/
int	nobuf;				/* # of	bytes in above		*/
#endif

#ifdef	VMS
#include	<stsdef.h>
#include	<ssdef.h>
#include	<descrip.h>
#include	<iodef.h>
#include	<ttdef.h>

#define	NIBUF	128			/* Input  buffer size		*/
#define	NOBUF	1024			/* MM says bug buffers win!	*/
#define	EFN	0			/* Event flag			*/

char	obuf[NOBUF];			/* Output buffer		*/
int	nobuf;				/* # of	bytes in above		*/
char	ibuf[NIBUF];			/* Input buffer			*/
int	nibuf;				/* # of	bytes in above		*/
int	ibufi;				/* Read	index			*/
int	oldmode[2];			/* Old TTY mode	bits		*/
int	newmode[2];			/* New TTY mode	bits		*/
short	iochan;				/* TTY I/O channel		*/
#endif

#ifdef	CPM
#include	<bdos.h>
#endif

#ifdef	MSDOS
#undef	LATTICE
#include	<dos.h>
#endif

#ifdef RAINBOW
#include "rainbow.h"
#endif

#ifdef V7
#include	<sgtty.h>		/* for stty/gtty functions */
struct	sgttyb	ostate;			/* saved tty state */
struct	sgttyb	nstate;			/* values for editor mode */
#endif

#ifdef	RSX
extern	ttinit(), ttrdy(), ttread(), ttflsh(), ttrest(), ttwrt();
#endif

/*
 * This	function is called once	to set up the terminal device streams.
 * On VMS, it translates SYS$INPUT until it finds the terminal,	then assigns
 * a channel to	it and sets it raw. On CPM it is a no-op.
 */
ttopen()
{
#ifdef	RSX
	ttinit();
	if(!isscope()) {
	  printf("Terminal isn't a scope.\n");
	  ttrest();
	  exit(-1);
	}
#endif

#ifdef	AMIGA
	terminal = Open("RAW:1/1/639/199/MicroEmacs", NEW);
#endif
#ifdef	VMS
	struct	dsc$descriptor	idsc;
	struct	dsc$descriptor	odsc;
	char	oname[40];
	int	iosb[2];
	int	status;

	odsc.dsc$a_pointer = "SYS$INPUT";
	odsc.dsc$w_length  = strlen(odsc.dsc$a_pointer);
	odsc.dsc$b_dtype   = DSC$K_DTYPE_T;
	odsc.dsc$b_class   = DSC$K_CLASS_S;
	idsc.dsc$b_dtype   = DSC$K_DTYPE_T;
	idsc.dsc$b_class   = DSC$K_CLASS_S;
	do {
		idsc.dsc$a_pointer = odsc.dsc$a_pointer;
		idsc.dsc$w_length  = odsc.dsc$w_length;
		odsc.dsc$a_pointer = &oname[0];
		odsc.dsc$w_length  = sizeof(oname);
		status = LIB$SYS_TRNLOG(&idsc, &odsc.dsc$w_length, &odsc);
		if (status!=SS$_NORMAL && status!=SS$_NOTRAN)
			exit(status);
		if (oname[0] ==	0x1B) {
			odsc.dsc$a_pointer += 4;
			odsc.dsc$w_length  -= 4;
		}
	} while	(status	== SS$_NORMAL);
	status = SYS$ASSIGN(&odsc, &iochan, 0, 0);
	if (status != SS$_NORMAL)
		exit(status);
	status = SYS$QIOW(EFN, iochan, IO$_SENSEMODE, iosb, 0, 0,
			  oldmode, sizeof(oldmode), 0, 0, 0, 0);
	if (status!=SS$_NORMAL || (iosb[0]&0xFFFF)!=SS$_NORMAL)
		exit(status);
	newmode[0] = oldmode[0];
	newmode[1] = oldmode[1]	| TT$M_PASSALL | TT$M_NOECHO;
	status = SYS$QIOW(EFN, iochan, IO$_SETMODE, iosb, 0, 0,
			  newmode, sizeof(newmode), 0, 0, 0, 0);
	if (status!=SS$_NORMAL || (iosb[0]&0xFFFF)!=SS$_NORMAL)
		exit(status);
#endif
#ifdef	CPM
#endif
#ifdef	MSDOS
#endif
#ifdef	V7
	gtty(1,	&ostate);			/* save	old state */
	gtty(1,	&nstate);			/* get base of new state */
	nstate.sg_flags	|= RAW;
	nstate.sg_flags	&= ~(ECHO|CRMOD);	/* no echo for now... */
	stty(1,	&nstate);			/* set mode */
#endif
}

/*
 * This	function gets called just before we go back home to the	command
 * interpreter.	On VMS it puts the terminal back in a reasonable state.
 * Another no-operation	on CPM.
 */
ttclose()
{
#ifdef	RSX
	ttflush();
	ttrest();
#endif

#ifdef	AMIGA
	Close(terminal);
#endif
#ifdef	VMS
	int	status;
	int	iosb[1];

	ttflush();
	status = SYS$QIOW(EFN, iochan, IO$_SETMODE, iosb, 0, 0,
		 oldmode, sizeof(oldmode), 0, 0, 0, 0);
	if (status!=SS$_NORMAL || (iosb[0]&0xFFFF)!=SS$_NORMAL)
		exit(status);
	status = SYS$DASSGN(iochan);
	if (status != SS$_NORMAL)
		exit(status);
#endif
#ifdef	CPM
#endif
#ifdef	MSDOS
#endif
#ifdef	V7
	stty(1,	&ostate);
#endif
}

/*
 * Write a character to	the display. On	VMS, terminal output is	buffered, and
 * we just put the characters in the big array,	after checking for overflow.
 * On CPM terminal I/O unbuffered, so we just write the	byte out. Ditto	on
 * MS-DOS (use the very	very raw console output	routine).
 */
ttputc(c)
#ifdef	RSX
	char c;
#endif
#ifdef	AMIGA
	char c;
#endif
{
#ifdef	RSX
	if(nobuf >= NOBUF)
		ttflush();
	obuf[nobuf++] = c;
#endif

#ifdef	AMIGA
	Write(terminal,	&c, LEN);
#endif
#ifdef	VMS
	if (nobuf >= NOBUF)
		ttflush();
	obuf[nobuf++] =	c;
#endif

#ifdef	CPM
	bios(BCONOUT, c, 0);
#endif

#ifdef	MSDOS
#ifdef	CWC86
	dosb(CONDIO, c,	0);
#endif
#endif

#ifdef RAINBOW
	Put_Char(c);			/* fast	video */
#endif

#ifdef	V7
	fputc(c, stdout);
#endif
}

/*
 * Flush terminal buffer. Does real work where the terminal output is buffered
 * up. A no-operation on systems where byte at a time terminal I/O is done.
 */
ttflush()
{
#ifdef	AMIGA
#endif

#ifdef RSX
	if(nobuf > 0)
		ttwrt(obuf, nobuf);

	nobuf = 0;
	return(TRUE);
#endif

#ifdef	VMS
	int	status;
	int	iosb[2];

	status = SS$_NORMAL;
	if (nobuf != 0)	{
		status = SYS$QIOW(EFN, iochan, IO$_WRITELBLK|IO$M_NOFORMAT,
			 iosb, 0, 0, obuf, nobuf, 0, 0,	0, 0);
		if (status == SS$_NORMAL)
			status = iosb[0] & 0xFFFF;
		nobuf =	0;
	}
	return (status);
#endif
#ifdef	CPM
#endif
#ifdef	MSDOS
#endif
#ifdef	V7
	fflush(stdout);
#endif
}

/*
 * Read	a character from the terminal, performing no editing and doing no echo
 * at all. More	complex	in VMS that almost anyplace else, which	figures. Very
 * simple on CPM, because the system can do exactly what you want.
 */
ttgetc()
{
#ifdef	RSX
	return((int) ttread());
#endif
#ifdef	AMIGA
	char ch;

	Read(terminal, &ch, LEN);
	return (int) ch;
#endif
#ifdef	VMS
	int	status;
	int	iosb[2];
	int	term[2];

	while (ibufi >=	nibuf) {
		ibufi =	0;
		term[0]	= 0;
		term[1]	= 0;
		status = SYS$QIOW(EFN, iochan, IO$_READLBLK|IO$M_TIMED,
			 iosb, 0, 0, ibuf, NIBUF, 0, term, 0, 0);
		if (status != SS$_NORMAL)
			exit(status);
		status = iosb[0] & 0xFFFF;
		if (status!=SS$_NORMAL && status!=SS$_TIMEOUT)
			exit(status);
		nibuf =	(iosb[0]>>16) +	(iosb[1]>>16);
		if (nibuf == 0)	{
			status = SYS$QIOW(EFN, iochan, IO$_READLBLK,
				 iosb, 0, 0, ibuf, 1, 0, term, 0, 0);
			if (status != SS$_NORMAL
			|| (status = (iosb[0]&0xFFFF)) != SS$_NORMAL)
				exit(status);
			nibuf =	(iosb[0]>>16) +	(iosb[1]>>16);
		}
	}
	return (ibuf[ibufi++] &	0xFF);		/* Allow multinational	*/
#endif

#ifdef	CPM
	return (biosb(BCONIN, 0, 0));
#endif

#ifdef RAINBOW
	int Ch;

	while ((Ch = Read_Keyboard()) <	0);

	if ((Ch	& Function_Key)	== 0)
		if (!((Ch & 0xFF) == 015 || (Ch	& 0xFF)	== 0177))
			Ch &= 0xFF;

	return Ch;
#endif

#ifdef	MSDOS
#ifdef	MWC86
	return (dosb(CONRAW, 0,	0));
#endif
#endif

#ifdef	V7
	return(fgetc(stdin));
#endif
}