xref: /freebsd/usr.bin/mt/mt.c (revision ae83180158c4c937f170e31eff311b18c0286a93)
1 /*
2  * Copyright (c) 1980, 1993
3  *	The Regents of the University of California.  All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  *    notice, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright
11  *    notice, this list of conditions and the following disclaimer in the
12  *    documentation and/or other materials provided with the distribution.
13  * 3. All advertising materials mentioning features or use of this software
14  *    must display the following acknowledgement:
15  *	This product includes software developed by the University of
16  *	California, Berkeley and its contributors.
17  * 4. Neither the name of the University nor the names of its contributors
18  *    may be used to endorse or promote products derived from this software
19  *    without specific prior written permission.
20  *
21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31  * SUCH DAMAGE.
32  */
33 
34 #ifndef lint
35 static const char copyright[] =
36 "@(#) Copyright (c) 1980, 1993\n\
37 	The Regents of the University of California.  All rights reserved.\n";
38 #endif /* not lint */
39 
40 #ifndef lint
41 #if 0
42 static char sccsid[] = "@(#)mt.c	8.2 (Berkeley) 5/4/95";
43 #endif
44 #endif /* not lint */
45 
46 #include <sys/cdefs.h>
47 __FBSDID("$FreeBSD$");
48 
49 /*
50  * mt --
51  *   magnetic tape manipulation program
52  */
53 #include <sys/types.h>
54 #include <sys/ioctl.h>
55 #include <sys/mtio.h>
56 
57 #include <ctype.h>
58 #include <err.h>
59 #include <fcntl.h>
60 #include <stdio.h>
61 #include <stdlib.h>
62 #include <string.h>
63 #include <unistd.h>
64 
65 /* the appropriate sections of <sys/mtio.h> are also #ifdef'd for FreeBSD */
66 /* c_flags */
67 #define NEED_2ARGS	0x01
68 #define ZERO_ALLOWED	0x02
69 #define IS_DENSITY	0x04
70 #define DISABLE_THIS	0x08
71 #define IS_COMP		0x10
72 
73 #ifndef TRUE
74 #define TRUE 1
75 #endif
76 #ifndef FALSE
77 #define FALSE 0
78 #endif
79 
80 struct commands {
81 	char *c_name;
82 	int c_code;
83 	int c_ronly;
84 	int c_flags;
85 } com[] = {
86 	{ "bsf",	MTBSF,	1, 0 },
87 	{ "bsr",	MTBSR,	1, 0 },
88 	/* XXX FreeBSD considered "eof" dangerous, since it's being
89 	   confused with "eom" (and is an alias for "weof" anyway) */
90 	{ "eof",	MTWEOF, 0, DISABLE_THIS },
91 	{ "fsf",	MTFSF,	1, 0 },
92 	{ "fsr",	MTFSR,	1, 0 },
93 	{ "offline",	MTOFFL,	1, 0 },
94 	{ "rewind",	MTREW,	1, 0 },
95 	{ "rewoffl",	MTOFFL,	1, 0 },
96 	{ "status",	MTNOP,	1, 0 },
97 	{ "weof",	MTWEOF,	0, ZERO_ALLOWED },
98 	{ "erase",	MTERASE, 0, ZERO_ALLOWED},
99 	{ "blocksize",	MTSETBSIZ, 0, NEED_2ARGS|ZERO_ALLOWED },
100 	{ "density",	MTSETDNSTY, 0, NEED_2ARGS|ZERO_ALLOWED|IS_DENSITY },
101 	{ "eom",	MTEOD, 1, 0 },
102 	{ "eod",	MTEOD, 1, 0 },
103 	{ "smk",	MTWSS, 0, 0 },
104 	{ "wss",	MTWSS, 0, 0 },
105 	{ "fss",	MTFSS, 1, 0 },
106 	{ "bss",	MTBSS, 1, 0 },
107 	{ "comp",	MTCOMP, 0, NEED_2ARGS|ZERO_ALLOWED|IS_COMP },
108 	{ "retension",	MTRETENS, 1, 0 },
109 	{ "rdhpos",     MTIOCRDHPOS,  0, 0 },
110 	{ "rdspos",     MTIOCRDSPOS,  0, 0 },
111 	{ "sethpos",    MTIOCHLOCATE, 0, NEED_2ARGS|ZERO_ALLOWED },
112 	{ "setspos",    MTIOCSLOCATE, 0, NEED_2ARGS|ZERO_ALLOWED },
113 	{ "errstat",	MTIOCERRSTAT, 0, 0 },
114 	{ "setmodel",	MTIOCSETEOTMODEL, 0, NEED_2ARGS|ZERO_ALLOWED },
115 	{ "seteotmodel",	MTIOCSETEOTMODEL, 0, NEED_2ARGS|ZERO_ALLOWED },
116 	{ "getmodel",	MTIOCGETEOTMODEL, 0, 0 },
117 	{ "geteotmodel",	MTIOCGETEOTMODEL, 0, 0 },
118 	{ NULL, 0, 0, 0 }
119 };
120 
121 const char *getblksiz(int);
122 void printreg(const char *, u_int, char *);
123 void status(struct mtget *);
124 void usage(void);
125 void st_status (struct mtget *);
126 int stringtodens (const char *s);
127 const char *denstostring (int d);
128 int denstobp(int d, int bpi);
129 u_int32_t stringtocomp(const char *s);
130 const char * comptostring(u_int32_t comp);
131 void warn_eof(void);
132 
133 int
134 main(argc, argv)
135 	int argc;
136 	char *argv[];
137 {
138 	register struct commands *comp;
139 	struct mtget mt_status;
140 	struct mtop mt_com;
141 	int ch, len, mtfd;
142 	char *p, *tape;
143 
144 	if ((tape = getenv("TAPE")) == NULL)
145 		tape = DEFTAPE;
146 
147 	while ((ch = getopt(argc, argv, "f:t:")) != -1)
148 		switch(ch) {
149 		case 'f':
150 		case 't':
151 			tape = optarg;
152 			break;
153 		case '?':
154 		default:
155 			usage();
156 		}
157 	argc -= optind;
158 	argv += optind;
159 
160 	if (argc < 1 || argc > 2)
161 		usage();
162 
163 	len = strlen(p = *argv++);
164 	for (comp = com;; comp++) {
165 		if (comp->c_name == NULL)
166 			errx(1, "%s: unknown command", p);
167 		if (strncmp(p, comp->c_name, len) == 0)
168 			break;
169 	}
170 	if((comp->c_flags & NEED_2ARGS) && argc != 2)
171 		usage();
172 	if(comp->c_flags & DISABLE_THIS) {
173 		warn_eof();
174 	}
175 	if ((mtfd = open(tape, comp->c_ronly ? O_RDONLY : O_RDWR)) < 0)
176 		err(1, "%s", tape);
177 	if (comp->c_code != MTNOP) {
178 		mt_com.mt_op = comp->c_code;
179 		if (*argv) {
180 			if (!isdigit(**argv) &&
181 			    (comp->c_flags & IS_DENSITY)) {
182 				const char *dcanon;
183 				mt_com.mt_count = stringtodens(*argv);
184 				if (mt_com.mt_count == 0)
185 					errx(1, "%s: unknown density", *argv);
186 				dcanon = denstostring(mt_com.mt_count);
187 				if (strcmp(dcanon, *argv) != 0)
188 					printf(
189 					"Using \"%s\" as an alias for %s\n",
190 					       *argv, dcanon);
191 				p = "";
192 			} else if (!isdigit(**argv) &&
193 				   (comp->c_flags & IS_COMP)) {
194 
195 				mt_com.mt_count = stringtocomp(*argv);
196 				if ((u_int32_t)mt_com.mt_count == 0xf0f0f0f0)
197 					errx(1, "%s: unknown compression",
198 					     *argv);
199 				p = "";
200 			} else
201 				/* allow for hex numbers; useful for density */
202 				mt_com.mt_count = strtol(*argv, &p, 0);
203 			if ((mt_com.mt_count <=
204 			    ((comp->c_flags & ZERO_ALLOWED)? -1: 0)
205 			    && ((comp->c_flags & IS_COMP) == 0)
206 			    ) || *p)
207 				errx(1, "%s: illegal count", *argv);
208 		}
209 		else
210 			mt_com.mt_count = 1;
211 		switch (comp->c_code) {
212 		case MTIOCERRSTAT:
213 		{
214 			unsigned int i;
215 			union mterrstat umn;
216 			struct scsi_tape_errors *s = &umn.scsi_errstat;
217 
218 			if (ioctl(mtfd, comp->c_code, (caddr_t)&umn) < 0)
219 				err(2, "%s", tape);
220 			(void)printf("Last I/O Residual: %u\n", s->io_resid);
221 			(void)printf(" Last I/O Command:");
222 			for (i = 0; i < sizeof (s->io_cdb); i++)
223 				(void)printf(" %02X", s->io_cdb[i]);
224 			(void)printf("\n");
225 			(void)printf("   Last I/O Sense:\n\n\t");
226 			for (i = 0; i < sizeof (s->io_sense); i++) {
227 				(void)printf(" %02X", s->io_sense[i]);
228 				if (((i + 1) & 0xf) == 0) {
229 					(void)printf("\n\t");
230 				}
231 			}
232 			(void)printf("\n");
233 			(void)printf("Last Control Residual: %u\n",
234 			    s->ctl_resid);
235 			(void)printf(" Last Control Command:");
236 			for (i = 0; i < sizeof (s->ctl_cdb); i++)
237 				(void)printf(" %02X", s->ctl_cdb[i]);
238 			(void)printf("\n");
239 			(void)printf("   Last Control Sense:\n\n\t");
240 			for (i = 0; i < sizeof (s->ctl_sense); i++) {
241 				(void)printf(" %02X", s->ctl_sense[i]);
242 				if (((i + 1) & 0xf) == 0) {
243 					(void)printf("\n\t");
244 				}
245 			}
246 			(void)printf("\n\n");
247 			exit(0);
248 			/* NOTREACHED */
249 		}
250 		case MTIOCRDHPOS:
251 		case MTIOCRDSPOS:
252 		{
253 			u_int32_t block;
254 			if (ioctl(mtfd, comp->c_code, (caddr_t)&block) < 0)
255 				err(2, "%s", tape);
256 			(void)printf("%s: %s block location %u\n", tape,
257 			    (comp->c_code == MTIOCRDHPOS)? "hardware" :
258 			    "logical", block);
259 			exit(0);
260 			/* NOTREACHED */
261 		}
262 		case MTIOCSLOCATE:
263 		case MTIOCHLOCATE:
264 		{
265 			u_int32_t block = (u_int32_t)mt_com.mt_count;
266 			if (ioctl(mtfd, comp->c_code, (caddr_t)&block) < 0)
267 				err(2, "%s", tape);
268 			exit(0);
269 			/* NOTREACHED */
270 		}
271 		case MTIOCGETEOTMODEL:
272 		{
273 			u_int32_t om;
274 			if (ioctl(mtfd, MTIOCGETEOTMODEL, (caddr_t)&om) < 0)
275 				err(2, "%s", tape);
276 			(void)printf("%s: the model is %u filemar%s at EOT\n",
277 			    tape, om, (om > 1)? "ks" : "k");
278 			exit(0);
279 			/* NOTREACHED */
280 		}
281 		case MTIOCSETEOTMODEL:
282 		{
283 			u_int32_t om, nm = (u_int32_t)mt_com.mt_count;
284 			if (ioctl(mtfd, MTIOCGETEOTMODEL, (caddr_t)&om) < 0)
285 				err(2, "%s", tape);
286 			if (ioctl(mtfd, comp->c_code, (caddr_t)&nm) < 0)
287 				err(2, "%s", tape);
288 			(void)printf("%s: old model was %u filemar%s at EOT\n",
289 			    tape, om, (om > 1)? "ks" : "k");
290 			(void)printf("%s: new model  is %u filemar%s at EOT\n",
291 			    tape, nm, (nm > 1)? "ks" : "k");
292 			exit(0);
293 			/* NOTREACHED */
294 		}
295 		default:
296 			break;
297 		}
298 		if (ioctl(mtfd, MTIOCTOP, &mt_com) < 0)
299 			err(1, "%s: %s", tape, comp->c_name);
300 	} else {
301 		if (ioctl(mtfd, MTIOCGET, &mt_status) < 0)
302 			err(1, NULL);
303 		status(&mt_status);
304 	}
305 	exit(0);
306 	/* NOTREACHED */
307 }
308 
309 #if defined(__i386__)
310 #include <machine/wtio.h>
311 #endif
312 
313 struct tape_desc {
314 	short	t_type;		/* type of magtape device */
315 	char	*t_name;	/* printing name */
316 	char	*t_dsbits;	/* "drive status" register */
317 	char	*t_erbits;	/* "error" register */
318 } tapes[] = {
319 	/*
320 	 * XXX This is weird.  The st driver reports the tape drive
321 	 * as 0x7 (MT_ISAR - Sun/Archive compatible); the wt driver
322 	 * either reports MT_ISVIPER1 for an Archive tape, or 0x11
323 	 * (MT_ISMFOUR) for other tapes.
324 	 * XXX for the wt driver, rely on it behaving like a "standard"
325 	 * magtape driver.
326 	 */
327 	{ MT_ISAR,	"SCSI tape drive", 0,		0 },
328 #if defined (__i386__)
329 	{ MT_ISVIPER1,	"Archive Viper", WTDS_BITS, WTER_BITS },
330 	{ MT_ISMFOUR,	"Wangtek",	 WTDS_BITS, WTER_BITS },
331 #endif
332 	{ 0, NULL, 0, 0 }
333 };
334 
335 /*
336  * Interpret the status buffer returned
337  */
338 void
339 status(bp)
340 	register struct mtget *bp;
341 {
342 	register struct tape_desc *mt;
343 
344 	for (mt = tapes;; mt++) {
345 		if (mt->t_type == 0) {
346 			(void)printf("%d: unknown tape drive type\n",
347 			    bp->mt_type);
348 			return;
349 		}
350 		if (mt->t_type == bp->mt_type)
351 			break;
352 	}
353 	if(mt->t_type == MT_ISAR)
354 		st_status(bp);
355 	else {
356 		(void)printf("%s tape drive, residual=%d\n",
357 		    mt->t_name, bp->mt_resid);
358 		printreg("ds", (unsigned short)bp->mt_dsreg, mt->t_dsbits);
359 		printreg("\ner", (unsigned short)bp->mt_erreg, mt->t_erbits);
360 		(void)putchar('\n');
361 	}
362 }
363 
364 /*
365  * Print a register a la the %b format of the kernel's printf.
366  */
367 void
368 printreg(s, v, bits)
369 	const char *s;
370 	register u_int v;
371 	register char *bits;
372 {
373 	register int i, any = 0;
374 	register char c;
375 
376 	if (bits && *bits == 8)
377 		printf("%s=%o", s, v);
378 	else
379 		printf("%s=%x", s, v);
380 	if (!bits)
381 		return;
382 	bits++;
383 	if (v && bits) {
384 		putchar('<');
385 		while ((i = *bits++)) {
386 			if (v & (1 << (i-1))) {
387 				if (any)
388 					putchar(',');
389 				any = 1;
390 				for (; (c = *bits) > 32; bits++)
391 					putchar(c);
392 			} else
393 				for (; *bits > 32; bits++)
394 					;
395 		}
396 		putchar('>');
397 	}
398 }
399 
400 void
401 usage()
402 {
403 	(void)fprintf(stderr, "usage: mt [-f device] command [count]\n");
404 	exit(1);
405 }
406 
407 struct densities {
408 	int dens;
409 	int bpmm;
410 	int bpi;
411 	const char *name;
412 } dens[] = {
413 	/*
414 	 * Taken from T10 Project 997D
415 	 * SCSI-3 Stream Device Commands (SSC)
416 	 * Revision 11, 4-Nov-97
417 	 */
418 	/*Num.  bpmm    bpi     Reference     */
419 	{ 0x1,	32,	800,	"X3.22-1983" },
420 	{ 0x2,	63,	1600,	"X3.39-1986" },
421 	{ 0x3,	246,	6250,	"X3.54-1986" },
422 	{ 0x5,	315,	8000,	"X3.136-1986" },
423 	{ 0x6,	126,	3200,	"X3.157-1987" },
424 	{ 0x7,	252,	6400,	"X3.116-1986" },
425 	{ 0x8,	315,	8000,	"X3.158-1987" },
426 	{ 0x9,	491,	37871,	"X3.180" },
427 	{ 0xA,	262,	6667,	"X3B5/86-199" },
428 	{ 0xB,	63,	1600,	"X3.56-1986" },
429 	{ 0xC,	500,	12690,	"HI-TC1" },
430 	{ 0xD,	999,	25380,	"HI-TC2" },
431 	{ 0xF,	394,	10000,	"QIC-120" },
432 	{ 0x10,	394,	10000,	"QIC-150" },
433 	{ 0x11,	630,	16000,	"QIC-320" },
434 	{ 0x12,	2034,	51667,	"QIC-1350" },
435 	{ 0x13,	2400,	61000,	"X3B5/88-185A" },
436 	{ 0x14,	1703,	43245,	"X3.202-1991" },
437 	{ 0x15,	1789,	45434,	"ECMA TC17" },
438 	{ 0x16,	394,	10000,	"X3.193-1990" },
439 	{ 0x17,	1673,	42500,	"X3B5/91-174" },
440 	{ 0x18,	1673,	42500,	"X3B5/92-50" },
441 	{ 0x19, 2460,   62500,  "DLTapeIII" },
442 	{ 0x1A, 3214,   81633,  "DLTapeIV(20GB)" },
443 	{ 0x1B, 3383,   85937,  "DLTapeIV(35GB)" },
444 	{ 0x1C, 1654,	42000,	"QIC-385M" },
445 	{ 0x1D,	1512,	38400,	"QIC-410M" },
446 	{ 0x1E, 1385,	36000,	"QIC-1000C" },
447 	{ 0x1F,	2666,	67733,	"QIC-2100C" },
448 	{ 0x20, 2666,	67733,	"QIC-6GB(M)" },
449 	{ 0x21,	2666,	67733,	"QIC-20GB(C)" },
450 	{ 0x22,	1600,	40640,	"QIC-2GB(C)" },
451 	{ 0x23, 2666,	67733,	"QIC-875M" },
452 	{ 0x24,	2400,	61000,	"DDS-2" },
453 	{ 0x25,	3816,	97000,	"DDS-3" },
454 	{ 0x26,	3816,	97000,	"DDS-4" },
455 	{ 0x27,	3056,	77611,	"Mammoth" },
456 	{ 0x28,	1491,	37871,	"X3.224" },
457 	{ 0x41, 3868,   98250,  "DLTapeIV(40GB)" },
458 	{ 0, 0, 0, NULL }
459 };
460 
461 struct compression_types {
462 	u_int32_t	comp_number;
463 	const char 	*name;
464 } comp_types[] = {
465 	{ 0x00, "none" },
466 	{ 0x00, "off" },
467 	{ 0x10, "IDRC" },
468 	{ 0x20, "DCLZ" },
469 	{ 0xffffffff, "enable" },
470 	{ 0xffffffff, "on" },
471 	{ 0xf0f0f0f0, NULL}
472 };
473 
474 const char *
475 denstostring(int d)
476 {
477 	static char buf[20];
478 	struct densities *sd;
479 
480 	/* densities 0 and 0x7f are handled as special cases */
481 	if (d == 0)
482 		return "default";
483 	if (d == 0x7f)
484 		return "same";
485 	for (sd = dens; sd->dens; sd++)
486 		if (sd->dens == d)
487 			break;
488 	if (sd->dens == 0)
489 		sprintf(buf, "0x%02x", d);
490 	else
491 		sprintf(buf, "0x%02x:%s", d, sd->name);
492 	return buf;
493 }
494 
495 /*
496  * Given a specific density number, return either the bits per inch or bits
497  * per millimeter for the given density.
498  */
499 int
500 denstobp(int d, int bpi)
501 {
502 	struct densities *sd;
503 
504 	for (sd = dens; sd->dens; sd++)
505 		if (sd->dens == d)
506 			break;
507 	if (sd->dens == 0)
508 		return(0);
509 	else {
510 		if (bpi)
511 			return(sd->bpi);
512 		else
513 			return(sd->bpmm);
514 	}
515 }
516 
517 int
518 stringtodens(const char *s)
519 {
520 	struct densities *sd;
521 	size_t l = strlen(s);
522 
523 	for (sd = dens; sd->dens; sd++)
524 		if (strncasecmp(sd->name, s, l) == 0)
525 			break;
526 	return sd->dens;
527 }
528 
529 
530 const char *
531 getblksiz(int bs)
532 {
533 	static char buf[25];
534 	if (bs == 0)
535 		return "variable";
536 	else {
537 		sprintf(buf, "%d bytes", bs);
538 		return buf;
539 	}
540 }
541 
542 const char *
543 comptostring(u_int32_t comp)
544 {
545 	static char buf[20];
546 	struct compression_types *ct;
547 
548 	if (comp == MT_COMP_DISABLED)
549 		return "disabled";
550 	else if (comp == MT_COMP_UNSUPP)
551 		return "unsupported";
552 
553 	for (ct = comp_types; ct->name; ct++)
554 		if (ct->comp_number == comp)
555 			break;
556 
557 	if (ct->comp_number == 0xf0f0f0f0) {
558 		sprintf(buf, "0x%x", comp);
559 		return(buf);
560 	} else
561 		return(ct->name);
562 }
563 
564 u_int32_t
565 stringtocomp(const char *s)
566 {
567 	struct compression_types *ct;
568 	size_t l = strlen(s);
569 
570 	for (ct = comp_types; ct->name; ct++)
571 		if (strncasecmp(ct->name, s, l) == 0)
572 			break;
573 
574 	return(ct->comp_number);
575 }
576 
577 void
578 st_status(struct mtget *bp)
579 {
580 	printf("Mode      Density              Blocksize      bpi      "
581 	       "Compression\n"
582 	       "Current:  %-17s    %-12s   %-7d  %s\n"
583 	       "---------available modes---------\n"
584 	       "0:        %-17s    %-12s   %-7d  %s\n"
585 	       "1:        %-17s    %-12s   %-7d  %s\n"
586 	       "2:        %-17s    %-12s   %-7d  %s\n"
587 	       "3:        %-17s    %-12s   %-7d  %s\n",
588 	       denstostring(bp->mt_density), getblksiz(bp->mt_blksiz),
589 	       denstobp(bp->mt_density, TRUE), comptostring(bp->mt_comp),
590 	       denstostring(bp->mt_density0), getblksiz(bp->mt_blksiz0),
591 	       denstobp(bp->mt_density0, TRUE), comptostring(bp->mt_comp0),
592 	       denstostring(bp->mt_density1), getblksiz(bp->mt_blksiz1),
593 	       denstobp(bp->mt_density1, TRUE), comptostring(bp->mt_comp1),
594 	       denstostring(bp->mt_density2), getblksiz(bp->mt_blksiz2),
595 	       denstobp(bp->mt_density2, TRUE), comptostring(bp->mt_comp2),
596 	       denstostring(bp->mt_density3), getblksiz(bp->mt_blksiz3),
597 	       denstobp(bp->mt_density3, TRUE), comptostring(bp->mt_comp3));
598 
599 	if (bp->mt_dsreg != MTIO_DSREG_NIL) {
600 		auto char foo[32];
601 		const char sfmt[] = "Current Driver State: %s.\n";
602 		printf("---------------------------------\n");
603 		switch (bp->mt_dsreg) {
604 		case MTIO_DSREG_REST:
605 			printf(sfmt, "at rest");
606 			break;
607 		case MTIO_DSREG_RBSY:
608 			printf(sfmt, "Communicating with drive");
609 			break;
610 		case MTIO_DSREG_WR:
611 			printf(sfmt, "Writing");
612 			break;
613 		case MTIO_DSREG_FMK:
614 			printf(sfmt, "Writing Filemarks");
615 			break;
616 		case MTIO_DSREG_ZER:
617 			printf(sfmt, "Erasing");
618 			break;
619 		case MTIO_DSREG_RD:
620 			printf(sfmt, "Reading");
621 			break;
622 		case MTIO_DSREG_FWD:
623 			printf(sfmt, "Spacing Forward");
624 			break;
625 		case MTIO_DSREG_REV:
626 			printf(sfmt, "Spacing Reverse");
627 			break;
628 		case MTIO_DSREG_POS:
629 			printf(sfmt,
630 			    "Hardware Positioning (direction unknown)");
631 			break;
632 		case MTIO_DSREG_REW:
633 			printf(sfmt, "Rewinding");
634 			break;
635 		case MTIO_DSREG_TEN:
636 			printf(sfmt, "Retensioning");
637 			break;
638 		case MTIO_DSREG_UNL:
639 			printf(sfmt, "Unloading");
640 			break;
641 		case MTIO_DSREG_LD:
642 			printf(sfmt, "Loading");
643 			break;
644 		default:
645 			(void) sprintf(foo, "Unknown state 0x%x", bp->mt_dsreg);
646 			printf(sfmt, foo);
647 			break;
648 		}
649 	}
650 	if (bp->mt_resid == 0 && bp->mt_fileno == (daddr_t) -1 &&
651 	    bp->mt_blkno == (daddr_t) -1)
652 		return;
653 	printf("---------------------------------\n");
654 	printf("File Number: %d\tRecord Number: %d\tResidual Count %d\n",
655 	    bp->mt_fileno, bp->mt_blkno, bp->mt_resid);
656 }
657 
658 void
659 warn_eof(void)
660 {
661 	fprintf(stderr,
662 		"The \"eof\" command has been disabled.\n"
663 		"Use \"weof\" if you really want to write end-of-file marks,\n"
664 		"or \"eom\" if you rather want to skip to the end of "
665 		"recorded medium.\n");
666 	exit(1);
667 }
668