/*
 * Copyright (c) 1980 The Regents of the University of California.
 * All rights reserved.
 *
 * %sccs.include.redist.c%
 */

#ifndef lint
char copyright[] =
"@(#) Copyright (c) 1980 The Regents of the University of California.\n\
 All rights reserved.\n";
#endif /* not lint */

#ifndef lint
static char sccsid[] = "@(#)mt.c	5.8 (Berkeley) 12/18/91";
#endif /* not lint */

/*
 * mt --
 *   magnetic tape manipulation program
 */
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/mtio.h>
#include <fcntl.h>
#include <errno.h>
#include <stdlib.h>
#include <stdio.h>
#include <ctype.h>
#include <string.h>

struct commands {
	char *c_name;
	int c_code;
	int c_ronly;
} com[] = {
	{ "bsf",	MTBSF,	1 },
	{ "bsr",	MTBSR,	1 },
	{ "eof",	MTWEOF,	0 },
	{ "fsf",	MTFSF,	1 },
	{ "fsr",	MTFSR,	1 },
	{ "offline",	MTOFFL,	1 },
	{ "rewind",	MTREW,	1 },
	{ "rewoffl",	MTOFFL,	1 },
	{ "status",	MTNOP,	1 },
	{ "weof",	MTWEOF,	0 },
	{ NULL }
};

void err __P((const char *, ...));
void printreg __P((char *, u_int, char *));
void status __P((struct mtget *));
void usage __P((void));

int
main(argc, argv)
	int argc;
	char *argv[];
{
	register struct commands *comp;
	struct mtget mt_status;
	struct mtop mt_com;
	int ch, len, mtfd;
	char *p, *tape;

	if ((tape = getenv("TAPE")) == NULL)
		tape = DEFTAPE;

	while ((ch = getopt(argc, argv, "f:t:")) != EOF)
		switch(ch) {
		case 'f':
		case 't':
			tape = optarg;
			break;
		case '?':
		default:
			usage();
		}
	argc -= optind;
	argv += optind;

	if (argc < 1 || argc > 2)
		usage();

	len = strlen(p = *argv++);
	for (comp = com;; comp++) {
		if (comp->c_name == NULL)
			err("%s: unknown command", p);
		if (strncmp(p, comp->c_name, len) == 0)
			break;
	}
	if ((mtfd = open(tape, comp->c_ronly ? O_RDONLY : O_RDWR)) < 0)
		err("%s: %s", tape, strerror(errno));
	if (comp->c_code != MTNOP) {
		mt_com.mt_op = comp->c_code;
		if (*argv) {
			mt_com.mt_count = strtol(*argv, &p, 10);
			if (mt_com.mt_count <= 0 || *p)
				err("%s: illegal count", *argv);
		}
		else
			mt_com.mt_count = 1;
		if (ioctl(mtfd, MTIOCTOP, &mt_com) < 0)
			err("%s: %s: %s", tape, comp->c_name, strerror(errno));
	} else {
		if (ioctl(mtfd, MTIOCGET, &mt_status) < 0)
			err("%s", strerror(errno));
		status(&mt_status);
	}
	exit (0);
	/* NOTREACHED */
}

#ifdef vax
#include <vax/mba/mtreg.h>
#include <vax/mba/htreg.h>

#include <vax/uba/utreg.h>
#include <vax/uba/tmreg.h>
#undef b_repcnt		/* argh */
#include <vax/uba/tsreg.h>
#endif

#ifdef sun
#include <sundev/tmreg.h>
#include <sundev/arreg.h>
#endif

#ifdef tahoe
#include <tahoe/vba/cyreg.h>
#endif

struct tape_desc {
	short	t_type;		/* type of magtape device */
	char	*t_name;	/* printing name */
	char	*t_dsbits;	/* "drive status" register */
	char	*t_erbits;	/* "error" register */
} tapes[] = {
#ifdef vax
	{ MT_ISTS,	"ts11",		0,		TSXS0_BITS },
	{ MT_ISHT,	"tm03",		HTDS_BITS,	HTER_BITS },
	{ MT_ISTM,	"tm11",		0,		TMER_BITS },
	{ MT_ISMT,	"tu78",		MTDS_BITS,	0 },
	{ MT_ISUT,	"tu45",		UTDS_BITS,	UTER_BITS },
#endif
#ifdef sun
	{ MT_ISCPC,	"TapeMaster",	TMS_BITS,	0 },
	{ MT_ISAR,	"Archive",	ARCH_CTRL_BITS,	ARCH_BITS },
#endif
#ifdef tahoe
	{ MT_ISCY,	"cipher",	CYS_BITS,	CYCW_BITS },
#endif
	{ 0 }
};

/*
 * Interpret the status buffer returned
 */
void
status(bp)
	register struct mtget *bp;
{
	register struct tape_desc *mt;

	for (mt = tapes;; mt++) {
		if (mt->t_type == 0) {
			(void)printf("%d: unknown tape drive type\n",
			    bp->mt_type);
			return;
		}
		if (mt->t_type == bp->mt_type)
			break;
	}
	(void)printf("%s tape drive, residual=%d\n", mt->t_name, bp->mt_resid);
	printreg("ds", bp->mt_dsreg, mt->t_dsbits);
	printreg("\ner", bp->mt_erreg, mt->t_erbits);
	(void)putchar('\n');
}

/*
 * Print a register a la the %b format of the kernel's printf.
 */
void
printreg(s, v, bits)
	char *s;
	register u_int v;
	register char *bits;
{
	register int i, any = 0;
	register char c;

	if (bits && *bits == 8)
		printf("%s=%o", s, v);
	else
		printf("%s=%x", s, v);
	bits++;
	if (v && bits) {
		putchar('<');
		while (i = *bits++) {
			if (v & (1 << (i-1))) {
				if (any)
					putchar(',');
				any = 1;
				for (; (c = *bits) > 32; bits++)
					putchar(c);
			} else
				for (; *bits > 32; bits++)
					;
		}
		putchar('>');
	}
}

void
usage()
{
	(void)fprintf(stderr, "usage: mt [-f device] command [ count ]\n");
	exit(1);
}

#if __STDC__
#include <stdarg.h>
#else
#include <varargs.h>
#endif

void
#if __STDC__
err(const char *fmt, ...)
#else
err(fmt, va_alist)
	char *fmt;
        va_dcl
#endif
{
	va_list ap;
#if __STDC__
	va_start(ap, fmt);
#else
	va_start(ap);
#endif
	(void)fprintf(stderr, "mt: ");
	(void)vfprintf(stderr, fmt, ap);
	va_end(ap);
	(void)fprintf(stderr, "\n");
	exit(1);
	/* NOTREACHED */
}