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/*
 * Set options for the current output terminal.
 */

#include <stdio.h>
#include <sgtty.h>

#define	ON	1
#define	OFF	2
#define	NONE	(-1)		/* Disabled character */
#define	NEXT	(-2)		/* Get next arg */
#define	DEL	0177		/* Del/rubout in ASCII */

/* Functions to set and reset parameters */
int	smode();
int	sspeed();
int	sedit();
int	stchars();
int	sflag();
int	sane();

struct	sgttyb	sgttyb;
struct	tchars	tchars;

int	hupflag;		/* Set hangup on close mode */
int	exclflag;		/* Set exclusive mode */
int	allflag;		/* Display all modes */
int	scmd = TIOCSETP;	/* Ordinary stty command */
int	printflag;		/* On for printing modes */

#define	NOPTS	(sizeof(sopts)/sizeof(struct sopts))

struct	sopts {
	char	*s_opt;
	int	(*s_func)();	/* Function takes arg1 & arg2 */
	char	*s_arg1;
	int	s_arg2;
	int	s_arg3;
}	sopts[] = {
	"flush", sflag, &scmd, TIOCSETP, 0,
	"-flush", sflag, &scmd, TIOCSETN, 0,
	"even", smode, NULL, EVENP, 0,
	"-even", smode, NULL, 0, EVENP,
	"odd", smode, NULL, ODDP, 0,
	"-odd", smode, NULL, 0, ODDP,
	"raw", smode, NULL, RAW, 0,
	"-raw", smode, NULL, 0, RAW,
	"cooked", smode, NULL, 0, RAW,
	"rawin", smode, NULL, RAWIN, 0,
	"-rawin", smode, NULL, 0, RAWIN,
	"rawout", smode, NULL, RAWOUT, 0,
	"-rawout", smode, NULL, 0, RAWOUT,
	"cbreak", smode, NULL, CBREAK, 0,
	"-cbreak", smode, NULL, 0, CBREAK,
	"-nl", smode, NULL, CRMOD, 0,
	"nl", smode, NULL, 0, CRMOD,
	"echo", smode, NULL, ECHO, 0,
	"-echo", smode, NULL, 0, ECHO,
	"lcase", smode, NULL, LCASE, 0,
	"-lcase", smode, NULL, 0, LCASE,
	"-tabs", smode, NULL, XTABS, 0,
	"tabs", smode, NULL, 0, XTABS,
	"tandem", smode, NULL, TANDEM, 0,
	"-tandem", smode, NULL, 0, TANDEM,
	"crt", smode, NULL, CRT, 0,
	"-crt", smode, NULL, 0, CRT,
	"ek", sedit, NULL, '#', '@',
#if DELAY
	"cr0", smode, NULL, CR0, CRDELAY,
	"cr1", smode, NULL, CR1, CRDELAY,
	"cr2", smode, NULL, CR2, CRDELAY,
	"cr3", smode, NULL, CR3, CRDELAY,
	"nl0", smode, NULL, NL0, NLDELAY,
	"nl1", smode, NULL, NL1, NLDELAY,
	"nl2", smode, NULL, NL2, NLDELAY,
	"nl3", smode, NULL, NL3, NLDELAY,
	"ff0", smode, NULL, FF0, VTDELAY,
	"ff1", smode, NULL, FF1, VTDELAY,
	"bs0", smode, NULL, BS0, BSDELAY,
	"bs1", smode, NULL, BS1, BSDELAY,
	"tab0", smode, NULL, TAB0, TBDELAY,
	"tab1", smode, NULL, TAB1, TBDELAY,
	"tab2", smode, NULL, TAB2, TBDELAY,
	"tab3", smode, NULL, TAB3, TBDELAY,
#endif
	"0", sspeed, NULL, B0, B0,
	"50", sspeed, NULL, B50, B50,
	"75", sspeed, NULL, B75, B75,
	"110", sspeed, NULL, B110, B110,
	"134", sspeed, NULL, B134, B134,
	"134.5", sspeed, NULL, B134, B134,
	"150", sspeed, NULL, B150, B150,
	"200", sspeed, NULL, B200, B200,
	"300", sspeed, NULL, B300, B300,
	"600", sspeed, NULL, B600, B600,
	"1200", sspeed, NULL, B1200, B1200,
	"1800", sspeed, NULL, B1800, B1800,
	"2000", sspeed, NULL, B2000, B2000,
	"2400", sspeed, NULL, B2400, B2400,
	"3600", sspeed, NULL, B3600, B3600,
	"4800", sspeed, NULL, B4800, B4800,
	"7200", sspeed, NULL, B7200, B7200,
	"9600", sspeed, NULL, B9600, B9600,
	"19200", sspeed, NULL, B19200, B19200,
	"exta", sspeed, NULL, EXTA, EXTA,
	"extb", sspeed, NULL, EXTB, EXTB,
	"hup", sflag, &hupflag, TIOCHPCL, 0,
	"-hup", sflag, &hupflag, TIOCCHPCL, 0,
	"excl", sflag, &exclflag, TIOCEXCL, 0,
	"-excl", sflag, &exclflag, TIOCNXCL, 0,
	"print", sflag, &printflag, 1, 0,
	"erase", sedit, NULL, NEXT, 0,
	"kill", sedit, NULL, 0, NEXT,
	"start", stchars, &tchars.t_startc, 0, 0,
	"stop", stchars, &tchars.t_stopc, 0, 0,
	"eof", stchars, &tchars.t_eofc, 0, 0,
	"break", stchars, &tchars.t_brkc, 0, 0,
	"quit", stchars, &tchars.t_quitc, 0, 0,
	"intr", stchars, &tchars.t_intrc, 0, 0,		/* compatibility */
	"int", stchars, &tchars.t_intrc, 0, 0,
	"sane", sane, NULL, 0, 0
};

/*
 * Names of the speeds
 */
char	*speeds[] = {
	"(hang up line)",
	"50 baud",
	"75 baud",
	"110 baud",
	"134.5 baud",
	"150 baud",
	"200 baud",
	"300 baud",
	"600 baud",
	"1200 baud",
	"1800 baud",
	"2000 baud",
	"2400 baud",
	"3600 baud",
	"4800 baud",
	"7200 baud",
	"9600 baud",
	"19.2 Kbaud",
	"exta",
	"extb",
};

int	sgtflag;		/* Says need sgtty */
int	tcflag;			/* Set terminal characters */
int	ttyfd;			/* Fd for setting attributes */

int	gargc;
char	**gargv;
char	*argv0;			/* For usage() */

/*
 * Main routine reads options and
 * calls appropriate mode setting routines.
 */
main(argc, argv)
char *argv[];
{
	char ttyname[40];
	register struct sopts *sp;
	register char *ap;

	ttyfd = fileno(stdout);
	gargc = argc;
	gargv = argv;
	argv0 = argv[0];
	while (argc > 1)  {
		if (argv[1][0] == '-')  {
			if (argv[1][1] == 't')  {
				sprintf(ttyname, "/dev/%s", &argv[1][2]);
				if ((ttyfd = open(ttyname, 1)) >= 0) {
					argv++;
					gargv++;
					argc--;
					gargc--;
				} else {
					ttyfd = fileno(stdout);
					argv++;
					argc--;
				}
			} else if (argv[1][1] == 'a')  {
				allflag = 1;
				argv++;
				gargv++;
				argc--;
				gargc--;
			} else {
				argv++;
				argc--;
			}
		} else {
			argv++;
			argc--;
		}
	}
	getmodes();
	if (gargc <= 1)
		prmodes();
	else
		while (gargc-- > 1) {
			ap = *++gargv;
			for (sp = sopts; sp < &sopts[NOPTS]; sp++)
				if (strcmp(sp->s_opt, ap) == 0) {
					(*sp->s_func)(sp->s_arg1, sp->s_arg2,
						sp->s_arg3);
					break;
				}
			if (sp == &sopts[NOPTS])
				sterr("bad mode `%s'", ap);
		}
	setmodes();
	if (printflag)
		prmodes();
	exit(0);
}

/*
 * smode - sets mode part of TIOCSETP structure.
 * First clears out bits in `reset' and then
 * sets bits in `set'.
 */
smode(junkp, set, reset)
char *junkp;
int set, reset;
{
	sgtflag = 1;
	sgttyb.sg_flags &= ~reset;
	sgttyb.sg_flags |= set;
}

/*
 * Set input and output speeds into sgttyb.
 */
sspeed(junkp, ispeed, ospeed)
char *junkp;
int ispeed, ospeed;
{
	sgtflag = 1;
	sgttyb.sg_ispeed = ispeed;
	sgttyb.sg_ospeed = ospeed;
}

/*
 * Set up erase and kill line editing
 * characters.
 */
sedit(junkp, erase, kill)
char *junkp;
int erase, kill;
{
	sgtflag = 1;
	if (erase != 0)
		if (erase == NEXT)
			sgttyb.sg_erase = cget(); else
			sgttyb.sg_erase = erase;
	if (kill != 0)
		if (kill == NEXT)
			sgttyb.sg_kill = cget(); else
			sgttyb.sg_kill = kill;
}

/*
 * set a flag
 * (e.g. hup, excl, flush)
 */
sflag(flagp, val, junk)
int *flagp;
int val, junk;
{
	*flagp = val;
}

/*
 * Set one of the terminal chars.
 */
/* ARGSUSED */
stchars(cp, junk, morejunk)
char *cp;
int junk, morejunk;
{
	tcflag = 1;
	*cp = cget();
}

/*
 * Print out the attributes
 * of the terminal.
 */
prmodes()
{
	prchar("Erase = ", sgttyb.sg_erase);
	prchar(", kill = ", sgttyb.sg_kill);
	putc('\n', stderr);
	prchar("Interrupt = ", tchars.t_intrc);
	prchar(", quit = ", tchars.t_quitc);
	prchar(", break = ", tchars.t_brkc);
	putc('\n', stderr);
	prchar("Start = ", tchars.t_startc);
	prchar(", stop = ", tchars.t_stopc);
	prchar(", eof = ", tchars.t_eofc);
	putc('\n', stderr);
	if (sgttyb.sg_ispeed == sgttyb.sg_ospeed)
		fprintf(stderr, "Speed: %s\n", speeds[sgttyb.sg_ispeed]);
	else
		fprintf(stderr, "Speed: %s (in), %s (out)\n",
			speeds[sgttyb.sg_ispeed],
			speeds[sgttyb.sg_ospeed]);
	fprintf(stderr, "Modes:");
	prflag(EVENP, "even", NULL);
	prflag(ODDP, "odd", NULL);
	prdelay(RAW, "rawin", "rawout", "raw");
	if (allflag) {
		prflag(CRMOD, "-nl", "nl");
		prflag(ECHO, "echo", "-echo");
		prflag(LCASE, "lcase", "-lcase");
		prflag(CBREAK, "cbreak", "-cbreak");
		prflag(TANDEM, "tandem", "-tandem");
		prflag(CRT, "crt", "-crt");
/* The following code gives misinformation.  Removed 91/11/17 - hws */
#if 0
		if (exclflag)
			fprintf(stderr, " excl");
		else
			fprintf(stderr, " -excl");
		if (hupflag)
			fprintf(stderr, " hup");
		else
			fprintf(stderr, " -hup");
#endif
	} else {
		prflag(CRMOD, NULL, "nl");
		prflag(ECHO, "echo", NULL);
		prflag(LCASE, "lcase", NULL);
		prflag(CBREAK, "cbreak", NULL);
		prflag(TANDEM, "tandem", NULL);
		prflag(CRT, "crt", NULL);
	}
	/* Delays not supported but should be included here */
	prflag(XTABS, "-tabs", "tabs");
	putc('\n', stderr);
}

/*
 * Print out a single flag
 */
prflag(mask, ons, offs)
int mask;
char *ons, *offs;
{
	if (sgttyb.sg_flags & mask) {
		if (ons != NULL)
			fprintf(stderr, " %s", ons);
	} else
		if (offs != NULL)
			fprintf(stderr, " %s", offs);
}

/*
 * Print out a 4-value delay-type (or raw)
 * flag.
 */
prdelay(mask, s1, s2, s3)
register int mask;
char *s1, *s2, *s3;
{
	register int t;
	register int mode;
	register char *s = NULL;

	mode = sgttyb.sg_flags;
	while ((mask & 01) == 0) {
		mask >>= 1;
		mode >>= 1;
	}
	t = mode&mask;
	if (t == 1)
		s = s1;
	else if (t == 2)
		s = s2;
	else if (t == 3)
		s = s3;
	if (s != NULL)
		fprintf(stderr, " %s", s);
}

/*
 * Print out a character taking into
 * account special characters.
 */
prchar(s, c)
char *s;
register unsigned char c;
{
	fprintf(stderr, "%s", s);
	if (c == -1)
		fprintf(stderr, "off");
	else if (c == DEL)
		fprintf(stderr, "DEL");
	else if (c < ' ')
		fprintf(stderr, "ctrl-%c", c+'A'-1);
	else if (c > DEL)
		fprintf(stderr, "'\\%3o'", c&0377);
	else
		fprintf(stderr, "'%c'", c);
}

/*
 * Get the modes and tchars value.
 */
getmodes()
{
	if (ioctl(ttyfd, TIOCGETC, &tchars) < 0
	 || ioctl(ttyfd, TIOCGETP, &sgttyb) < 0)
		sterr("not a terminal");
}

/*
 * Set the modes as appropriate
 * for the commands given.
 */
setmodes()
{
	if (sgtflag)
		ioctl(ttyfd, scmd, &sgttyb);
	if (tcflag)
		ioctl(ttyfd, TIOCSETC, &tchars);
	if (hupflag)
		ioctl(ttyfd, hupflag, 0);
	if (exclflag)
		ioctl(ttyfd, exclflag, 0);
}

/*
 * Get another character from
 * the command line (e.g. stty erase x)
 */
cget()
{
	register char *ap;

	if (gargc < 2)
		usage();
	ap = gargv[1];
	gargv++;
	gargc--;
	if (strcmp(ap, "off") == 0)
		return (NONE);
	if (strcmp(ap, "DEL") == 0)
		return (DEL);
	if (strncmp(ap, "ctrl-", 5)==0 && ap[5]!='\0' && ap[6]=='\0')
		return (ap[5]&~0140);
	if (*ap=='\\' && ap[1]>='0' && ap[1]<='7') {
		register char *cp;
		register int n;

		n = 0;
		cp = ap+1;
		while (*cp>='0' && *cp<='7')
			n = n*8 + *cp++-'0';
		if (*cp == '\0')
			return (n);
	}
	if (*ap=='^' && ap[1]!='\0') {
		if (ap[2]=='\0' && ap[1]&0100)
			return (ap[1]&~0140);
	} else if (*ap!='\0' && ap[1]=='\0')
		return (*ap);
	sterr("Badly-formed character `%s'", ap);
}

/*
 * Print out usage message
 */
usage()
{
	fprintf(stderr, "Usage: %s [-a] [-tttyname] [modes|speeds|chars|]\n",
		argv0);
	exit(1);
}

/*
 * Error messages with exit from stty.
 */
/* VARARGS */
sterr(x)
{
	if (isatty(fileno(stdout)))
		fprintf(stderr, "stty: ");
	fprintf(stderr, "%r", &x);
	fprintf(stderr, "\n");
	exit (1);
}

/*
 * Set terminal parameters to something reasonable.
 */
sane()
{
	sgtflag = 1;
	sgttyb.sg_flags &= ~(RAW | CBREAK);	/* cooked -cbreak */
	sgttyb.sg_flags |= (CRMOD | ECHO);	/* -nl echo */
}

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