1/* $NetBSD: chio.c,v 1.33 2017/10/16 17:08:35 jnemeth Exp $ */
2
3/*-
4 * Copyright (c) 1996, 1998, 1999 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
9 * NASA Ames Research Center.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
30 * POSSIBILITY OF SUCH DAMAGE.
31 */
32
33/*
34 * Additional Copyright (c) 1997, by Matthew Jacob, for NASA/Ames Research Ctr.
35 */
36
37#include <sys/cdefs.h>
38#ifndef lint
39__COPYRIGHT(
40"@(#) Copyright (c) 1996, 1998, 1999\
41 The NetBSD Foundation, Inc. All rights reserved.");
42__RCSID("$NetBSD: chio.c,v 1.33 2017/10/16 17:08:35 jnemeth Exp $");
43#endif
44
45#include <sys/param.h>
46#include <sys/ioctl.h>
47#include <sys/chio.h>
48#include <sys/cdio.h> /* for ATAPI CD changer; too bad it uses a lame API */
49
50#include <ctype.h>
51#include <err.h>
52#include <errno.h>
53#include <fcntl.h>
54#include <limits.h>
55#include <stdio.h>
56#include <stdlib.h>
57#include <string.h>
58#include <unistd.h>
59
60#include "defs.h"
61#include "pathnames.h"
62
63__dead static void usage(void);
64static void cleanup(void);
65static int parse_element_type(const char *);
66static int parse_element_unit(const char *);
67static int parse_special(const char *);
68static int is_special(const char *);
69static const char *bits_to_string(int, const char *);
70
71static int do_move(const char *, int, char **);
72static int do_exchange(const char *, int, char **);
73static int do_position(const char *, int, char **);
74static int do_params(const char *, int, char **);
75static int do_getpicker(const char *, int, char **);
76static int do_setpicker(const char *, int, char **);
77static int do_status(const char *, int, char **);
78static int do_ielem(const char *, int, char **);
79static int do_cdlu(const char *, int, char **);
80
81/* Valid changer element types. */
82const struct element_type elements[] = {
83 { "picker", CHET_MT },
84 { "slot", CHET_ST },
85 { "portal", CHET_IE },
86 { "drive", CHET_DT },
87 { NULL, 0 },
88};
89
90/* Valid commands. */
91const struct changer_command commands[] = {
92 { "move", " <from ET> <from EU> <to ET> <to EU> [inv]",
93 do_move },
94
95 { "exchange", " <src ET> <src EU> <dst1 ET> <dst1 EU>\n"
96 "\t\t [<dst2 ET> <dst2 EU>] [inv1] [inv2]",
97 do_exchange },
98
99 { "position", " <to ET> <to EU> [inv]", do_position },
100
101 { "params", "",
102 do_params },
103
104 { "getpicker", "",
105 do_getpicker },
106
107 { "setpicker", " <picker>",
108 do_setpicker },
109
110 { "status", " [<ET> [unit [count]]] [voltags]",
111 do_status },
112
113 { "ielem", "",
114 do_ielem },
115
116 { "cdlu", " load|unload <slot>\n"
117 "\t abort",
118 do_cdlu },
119
120 { NULL, NULL,
121 NULL },
122};
123
124/* Valid special words. */
125const struct special_word specials[] = {
126 { "inv", SW_INVERT },
127 { "inv1", SW_INVERT1 },
128 { "inv2", SW_INVERT2 },
129 { "voltags", SW_VOLTAGS },
130 { NULL, 0 },
131};
132
133static const char *changer_name;
134static int changer_fd;
135
136int
137main(int argc, char *argv[])
138{
139 int ch, i;
140
141 setprogname(argv[0]);
142 while ((ch = getopt(argc, argv, "f:")) != -1) {
143 switch (ch) {
144 case 'f':
145 changer_name = optarg;
146 break;
147 default:
148 usage();
149 /* NOTREACHED */
150 }
151 }
152 argc -= optind;
153 argv += optind;
154
155 if (argc == 0)
156 usage();
157 /* NOTREACHED */
158
159 /* Get the default changer if not already specified. */
160 if (changer_name == NULL)
161 if ((changer_name = getenv(CHANGER_ENV_VAR)) == NULL)
162 changer_name = _PATH_CH;
163
164 /* Open the changer device. */
165 if ((changer_fd = open(changer_name, O_RDWR, 0600)) == -1)
166 err(EXIT_FAILURE, "%s: open", changer_name);
167 /* NOTREACHED */
168
169 /* Register cleanup function. */
170 if (atexit(cleanup))
171 err(EXIT_FAILURE, "can't register cleanup function");
172 /* NOTREACHED */
173
174 /* Find the specified command. */
175 for (i = 0; commands[i].cc_name != NULL; ++i)
176 if (strcmp(*argv, commands[i].cc_name) == 0)
177 break;
178 if (commands[i].cc_name == NULL)
179 errx(EXIT_FAILURE, "unknown command: %s", *argv);
180 /* NOTREACHED */
181
182 /* Skip over the command name and call handler. */
183 ++argv; --argc;
184 exit((*commands[i].cc_handler)(commands[i].cc_name, argc, argv));
185 /* NOTREACHED */
186}
187
188static int
189do_move(const char *cname, int argc, char **argv)
190{
191 struct changer_move_request cmd;
192 int val;
193
194 /*
195 * On a move command, we expect the following:
196 *
197 * <from ET> <from EU> <to ET> <to EU> [inv]
198 *
199 * where ET == element type and EU == element unit.
200 */
201 if (argc < 4) {
202 warnx("%s: too few arguments", cname);
203 usage();
204 /*NOTREACHED*/
205 } else if (argc > 5) {
206 warnx("%s: too many arguments", cname);
207 usage();
208 /*NOTREACHED*/
209 }
210 (void)memset(&cmd, 0, sizeof(cmd));
211
212 /* <from ET> */
213 cmd.cm_fromtype = parse_element_type(*argv);
214 ++argv; --argc;
215
216 /* <from EU> */
217 cmd.cm_fromunit = parse_element_unit(*argv);
218 ++argv; --argc;
219
220 /* <to ET> */
221 cmd.cm_totype = parse_element_type(*argv);
222 ++argv; --argc;
223
224 /* <to EU> */
225 cmd.cm_tounit = parse_element_unit(*argv);
226 ++argv; --argc;
227
228 /* Deal with optional command modifier. */
229 if (argc) {
230 val = parse_special(*argv);
231 switch (val) {
232 case SW_INVERT:
233 cmd.cm_flags |= CM_INVERT;
234 break;
235 default:
236 errx(EXIT_FAILURE, "%s: inappropriate modifier `%s'",
237 cname, *argv);
238 /* NOTREACHED */
239 }
240 }
241
242 /* Send command to changer. */
243 if (ioctl(changer_fd, CHIOMOVE, &cmd))
244 err(EXIT_FAILURE, "%s: CHIOMOVE", changer_name);
245 /* NOTREACHED */
246
247 return (0);
248}
249
250static int
251do_exchange(const char *cname, int argc, char **argv)
252{
253 struct changer_exchange_request cmd;
254 int val;
255
256 /*
257 * On an exchange command, we expect the following:
258 *
259 * <src ET> <src EU> <dst1 ET> <dst1 EU> [<dst2 ET> <dst2 EU>] [inv1] [inv2]
260 *
261 * where ET == element type and EU == element unit.
262 */
263 if (argc < 4) {
264 warnx("%s: too few arguments", cname);
265 usage();
266 /*NOTREACHED*/
267 } else if (argc > 8) {
268 warnx("%s: too many arguments", cname);
269 usage();
270 /*NOTREACHED*/
271 }
272 (void)memset(&cmd, 0, sizeof(cmd));
273
274 /* <src ET> */
275 cmd.ce_srctype = parse_element_type(*argv);
276 ++argv; --argc;
277
278 /* <src EU> */
279 cmd.ce_srcunit = parse_element_unit(*argv);
280 ++argv; --argc;
281
282 /* <dst1 ET> */
283 cmd.ce_fdsttype = parse_element_type(*argv);
284 ++argv; --argc;
285
286 /* <dst1 EU> */
287 cmd.ce_fdstunit = parse_element_unit(*argv);
288 ++argv; --argc;
289
290 /*
291 * If the next token is a special word or there are no more
292 * arguments, then this is a case of simple exchange.
293 * dst2 == src.
294 */
295 if ((argc == 0) || is_special(*argv)) {
296 cmd.ce_sdsttype = cmd.ce_srctype;
297 cmd.ce_sdstunit = cmd.ce_srcunit;
298 goto do_special;
299 }
300
301 /* <dst2 ET> */
302 cmd.ce_sdsttype = parse_element_type(*argv);
303 ++argv; --argc;
304
305 /* <dst2 EU> */
306 cmd.ce_sdstunit = parse_element_unit(*argv);
307 ++argv; --argc;
308
309 do_special:
310 /* Deal with optional command modifiers. */
311 while (argc) {
312 val = parse_special(*argv);
313 ++argv; --argc;
314 switch (val) {
315 case SW_INVERT1:
316 cmd.ce_flags |= CE_INVERT1;
317 break;
318 case SW_INVERT2:
319 cmd.ce_flags |= CE_INVERT2;
320 break;
321 default:
322 errx(EXIT_FAILURE, "%s: inappropriate modifier `%s'",
323 cname, *argv);
324 /* NOTREACHED */
325 }
326 }
327
328 /* Send command to changer. */
329 if (ioctl(changer_fd, CHIOEXCHANGE, &cmd))
330 err(EXIT_FAILURE, "%s: CHIOEXCHANGE", changer_name);
331 /* NOTREACHED */
332
333 return (0);
334}
335
336static int
337do_position(const char *cname, int argc, char **argv)
338{
339 struct changer_position_request cmd;
340 int val;
341
342 /*
343 * On a position command, we expect the following:
344 *
345 * <to ET> <to EU> [inv]
346 *
347 * where ET == element type and EU == element unit.
348 */
349 if (argc < 2) {
350 warnx("%s: too few arguments", cname);
351 usage();
352 /*NOTREACHED*/
353 } else if (argc > 3) {
354 warnx("%s: too many arguments", cname);
355 usage();
356 /*NOTREACHED*/
357 }
358 (void)memset(&cmd, 0, sizeof(cmd));
359
360 /* <to ET> */
361 cmd.cp_type = parse_element_type(*argv);
362 ++argv; --argc;
363
364 /* <to EU> */
365 cmd.cp_unit = parse_element_unit(*argv);
366 ++argv; --argc;
367
368 /* Deal with optional command modifier. */
369 if (argc) {
370 val = parse_special(*argv);
371 switch (val) {
372 case SW_INVERT:
373 cmd.cp_flags |= CP_INVERT;
374 break;
375 default:
376 errx(EXIT_FAILURE, "%s: inappropriate modifier `%s'",
377 cname, *argv);
378 /* NOTREACHED */
379 }
380 }
381
382 /* Send command to changer. */
383 if (ioctl(changer_fd, CHIOPOSITION, &cmd))
384 err(EXIT_FAILURE, "%s: CHIOPOSITION", changer_name);
385 /* NOTREACHED */
386
387 return (0);
388}
389
390/* ARGSUSED */
391static int
392do_params(const char *cname, int argc, char **argv)
393{
394 struct changer_params data;
395
396 /* No arguments to this command. */
397 if (argc) {
398 warnx("%s: no arguments expected", cname);
399 usage();
400 /* NOTREACHED */
401 }
402
403 /* Get params from changer and display them. */
404 (void)memset(&data, 0, sizeof(data));
405 if (ioctl(changer_fd, CHIOGPARAMS, &data))
406 err(EXIT_FAILURE, "%s: CHIOGPARAMS", changer_name);
407 /* NOTREACHED */
408
409#define PLURAL(n) (n) > 1 ? "s" : ""
410
411 (void)printf("%s: %d slot%s, %d drive%s, %d picker%s",
412 changer_name,
413 data.cp_nslots, PLURAL(data.cp_nslots),
414 data.cp_ndrives, PLURAL(data.cp_ndrives),
415 data.cp_npickers, PLURAL(data.cp_npickers));
416 if (data.cp_nportals)
417 (void)printf(", %d portal%s", data.cp_nportals,
418 PLURAL(data.cp_nportals));
419
420#undef PLURAL
421
422 (void)printf("\n%s: current picker: %d\n", changer_name, data.cp_curpicker);
423
424 return (0);
425}
426
427/* ARGSUSED */
428static int
429do_getpicker(const char *cname, int argc, char **argv)
430{
431 int picker;
432
433 /* No arguments to this command. */
434 if (argc) {
435 warnx("%s: no arguments expected", cname);
436 usage();
437 /*NOTREACHED*/
438 }
439
440 /* Get current picker from changer and display it. */
441 if (ioctl(changer_fd, CHIOGPICKER, &picker))
442 err(EXIT_FAILURE, "%s: CHIOGPICKER", changer_name);
443 /* NOTREACHED */
444
445 (void)printf("%s: current picker: %d\n", changer_name, picker);
446
447 return (0);
448}
449
450static int
451do_setpicker(const char *cname, int argc, char **argv)
452{
453 int picker;
454
455 if (argc < 1) {
456 warnx("%s: too few arguments", cname);
457 usage();
458 /*NOTREACHED*/
459 } else if (argc > 1) {
460 warnx("%s: too many arguments", cname);
461 usage();
462 /*NOTREACHED*/
463 }
464
465 picker = parse_element_unit(*argv);
466
467 /* Set the changer picker. */
468 if (ioctl(changer_fd, CHIOSPICKER, &picker))
469 err(EXIT_FAILURE, "%s: CHIOSPICKER", changer_name);
470
471 return (0);
472}
473
474static int
475do_status(const char *cname, int argc, char **argv)
476{
477 struct changer_element_status_request cmd;
478 struct changer_params data;
479 struct changer_element_status *ces;
480 int i, chet, count, echet, flags, have_ucount, have_unit;
481 int schet, ucount, unit;
482 size_t size;
483
484 flags = 0;
485 ucount = 0;
486 unit = 0;
487 have_ucount = 0;
488 have_unit = 0;
489
490 /*
491 * On a status command, we expect the following:
492 *
493 * [<ET> [unit [count]]] [voltags]
494 *
495 * where ET == element type.
496 *
497 * If we get no element-related arguments, we get the status of all
498 * known element types.
499 */
500 if (argc > 4) {
501 warnx("%s: too many arguments", cname);
502 usage();
503 /*NOTREACHED*/
504 }
505
506 /*
507 * Get params from changer. Specifically, we need the element
508 * counts.
509 */
510 (void)memset(&data, 0, sizeof(data));
511 if (ioctl(changer_fd, CHIOGPARAMS, &data))
512 err(EXIT_FAILURE, "%s: CHIOGPARAMS", changer_name);
513 /* NOTREACHED */
514
515 schet = CHET_MT;
516 echet = CHET_DT;
517
518 for (; argc != 0; argc--, argv++) {
519 /*
520 * If we have the voltags modifier, it must be the
521 * last argument.
522 */
523 if (is_special(argv[0])) {
524 if (argc != 1) {
525 warnx("%s: malformed command line", cname);
526 usage();
527 /*NOTREACHED*/
528 }
529 if (parse_special(argv[0]) != SW_VOLTAGS)
530 errx(EXIT_FAILURE,
531 "%s: inappropriate special word: %s",
532 cname, argv[0]);
533 /* NOTREACHED */
534 flags |= CESR_VOLTAGS;
535 continue;
536 }
537
538 /*
539 * If we get an element type, we can't have specified
540 * anything else.
541 */
542 if (isdigit((unsigned char)*argv[0]) == 0) {
543 if (schet == echet || flags != 0 || have_unit ||
544 have_ucount) {
545 warnx("%s: malformed command line", cname);
546 usage();
547 /*NOTREACHED*/
548 }
549 schet = echet = parse_element_type(argv[0]);
550 continue;
551 }
552
553 /*
554 * We know we have a digit here. If we do, we must
555 * have specified an element type.
556 */
557 if (schet != echet) {
558 warnx("%s: malformed command line", cname);
559 usage();
560 /*NOTREACHED*/
561 }
562
563 i = parse_element_unit(argv[0]);
564
565 if (have_unit == 0) {
566 unit = i;
567 have_unit = 1;
568 } else if (have_ucount == 0) {
569 ucount = i;
570 have_ucount = 1;
571 } else {
572 warnx("%s: malformed command line", cname);
573 usage();
574 /*NOTREACHED*/
575 }
576 }
577
578 for (chet = schet; chet <= echet; ++chet) {
579 switch (chet) {
580 case CHET_MT:
581 count = data.cp_npickers;
582 break;
583 case CHET_ST:
584 count = data.cp_nslots;
585 break;
586 case CHET_IE:
587 count = data.cp_nportals;
588 break;
589 case CHET_DT:
590 count = data.cp_ndrives;
591 break;
592 default:
593 /* To appease gcc -Wuninitialized. */
594 count = 0;
595 }
596
597 if (count == 0) {
598 if (schet != echet)
599 continue;
600 else {
601 (void)printf("%s: no %s elements\n",
602 changer_name,
603 elements[chet].et_name);
604 return (0);
605 }
606 }
607
608 /*
609 * If we have a unit, we may or may not have a count.
610 * If we don't have a unit, we don't have a count, either.
611 *
612 * Make sure both are initialized.
613 */
614 if (have_unit) {
615 if (have_ucount == 0)
616 ucount = 1;
617 } else {
618 unit = 0;
619 ucount = count;
620 }
621
622 if ((unit + ucount) > count)
623 errx(EXIT_FAILURE, "%s: invalid unit/count %d/%d",
624 cname, unit, ucount);
625 /* NOTREACHED */
626
627 size = ucount * sizeof(struct changer_element_status);
628
629 /* Allocate storage for the status bytes. */
630 if ((ces = malloc(size)) == NULL)
631 errx(EXIT_FAILURE, "can't allocate status storage");
632 /* NOTREACHED */
633
634 (void)memset(ces, 0, size);
635 (void)memset(&cmd, 0, sizeof(cmd));
636
637 cmd.cesr_type = chet;
638 cmd.cesr_unit = unit;
639 cmd.cesr_count = ucount;
640 cmd.cesr_flags = flags;
641 cmd.cesr_data = ces;
642
643 /*
644 * Should we deal with this eventually?
645 */
646 cmd.cesr_vendor_data = NULL;
647
648 if (ioctl(changer_fd, CHIOGSTATUS, &cmd)) {
649 free(ces);
650 err(EXIT_FAILURE, "%s: CHIOGSTATUS", changer_name);
651 /* NOTREACHED */
652 }
653
654 /* Dump the status for each element of this type. */
655 for (i = 0; i < ucount; i++) {
656 (void)printf("%s %d: ", elements[chet].et_name,
657 unit + i);
658 if ((ces[i].ces_flags & CESTATUS_STATUS_VALID) == 0) {
659 (void)printf("status not available\n");
660 continue;
661 }
662 (void)printf("%s", bits_to_string(ces[i].ces_flags,
663 CESTATUS_BITS));
664 if (ces[i].ces_flags & CESTATUS_XNAME_VALID)
665 (void)printf(" (%s)", ces[i].ces_xname);
666 (void)printf("\n");
667 if (ces[i].ces_flags & CESTATUS_PVOL_VALID)
668 (void)printf("\tPrimary volume tag: %s "
669 "ver. %d\n",
670 ces[i].ces_pvoltag.cv_tag,
671 ces[i].ces_pvoltag.cv_serial);
672 if (ces[i].ces_flags & CESTATUS_AVOL_VALID)
673 (void)printf("\tAlternate volume tag: %s "
674 "ver. %d\n",
675 ces[i].ces_avoltag.cv_tag,
676 ces[i].ces_avoltag.cv_serial);
677 if (ces[i].ces_flags & CESTATUS_FROM_VALID)
678 (void)printf("\tFrom: %s %d\n",
679 elements[ces[i].ces_from_type].et_name,
680 ces[i].ces_from_unit);
681 if (ces[i].ces_vendor_len)
682 (void)printf("\tVendor-specific data size: "
683 "%lu\n", (u_long)ces[i].ces_vendor_len);
684 }
685 free(ces);
686 }
687
688 return (0);
689}
690
691/* ARGSUSED */
692static int
693do_ielem(const char *cname, int argc, char **argv)
694{
695
696 if (ioctl(changer_fd, CHIOIELEM, NULL))
697 err(EXIT_FAILURE, "%s: CHIOIELEM", changer_name);
698 /* NOTREACHED */
699
700 return (0);
701}
702
703/* ARGSUSED */
704static int
705do_cdlu(const char *cname, int argc, char **argv)
706{
707 static const struct special_word cdlu_subcmds[] = {
708 { "load", CD_LU_LOAD },
709 { "unload", CD_LU_UNLOAD },
710 { "abort", CD_LU_ABORT },
711 { NULL, 0 },
712 };
713 struct ioc_load_unload cmd;
714 int i;
715
716 /*
717 * This command is a little different, since we are mostly dealing
718 * with ATAPI CD changers, which have a lame API (since ATAPI doesn't
719 * have LUNs).
720 *
721 * We have 3 sub-commands: "load", "unload", and "abort". The
722 * first two take a slot number. The latter does not.
723 */
724
725 if (argc < 1 || argc > 2)
726 usage();
727 /*NOTREACHED*/
728
729 for (i = 0; cdlu_subcmds[i].sw_name != NULL; i++) {
730 if (strcmp(argv[0], cdlu_subcmds[i].sw_name) == 0) {
731 cmd.options = cdlu_subcmds[i].sw_value;
732 break;
733 }
734 }
735 if (cdlu_subcmds[i].sw_name == NULL)
736 usage();
737 /*NOTREACHED*/
738
739 if (strcmp(argv[0], "abort") == 0)
740 cmd.slot = 0;
741 else
742 cmd.slot = parse_element_unit(argv[1]);
743
744 /*
745 * XXX Should maybe do something different with the device
746 * XXX handling for cdlu; think about this some more.
747 */
748 if (ioctl(changer_fd, CDIOCLOADUNLOAD, &cmd))
749 err(EXIT_FAILURE, "%s: CDIOCLOADUNLOAD", changer_name);
750 /* NOTREACHED */
751
752 return (0);
753}
754
755static int
756parse_element_type(const char *cp)
757{
758 int i;
759
760 for (i = 0; elements[i].et_name != NULL; ++i)
761 if (strcmp(elements[i].et_name, cp) == 0)
762 return (elements[i].et_type);
763
764 errx(EXIT_FAILURE, "invalid element type `%s'", cp);
765 /* NOTREACHED */
766}
767
768static int
769parse_element_unit(const char *cp)
770{
771 char *p;
772 int i;
773
774 i = (int)strtol(cp, &p, 10);
775 if ((i < 0) || (*p != '\0'))
776 errx(EXIT_FAILURE, "invalid unit number `%s'", cp);
777
778 return (i);
779}
780
781static int
782parse_special(const char *cp)
783{
784 int val;
785
786 val = is_special(cp);
787 if (val)
788 return (val);
789
790 errx(EXIT_FAILURE, "invalid modifier `%s'", cp);
791 /* NOTREACHED */
792}
793
794static int
795is_special(const char *cp)
796{
797 int i;
798
799 for (i = 0; specials[i].sw_name != NULL; ++i)
800 if (strcmp(specials[i].sw_name, cp) == 0)
801 return (specials[i].sw_value);
802
803 return (0);
804}
805
806static const char *
807bits_to_string(int v, const char *cp)
808{
809 static char buf[128];
810 const char *np;
811 char *bp, f;
812 int first;
813
814 bp = buf;
815 *bp++ = '<';
816 for (first = 1; (f = *cp++) != 0; cp = np) {
817 for (np = cp; *np >= ' ';)
818 np++;
819 if ((v & (1 << (f - 1))) == 0)
820 continue;
821 if (first)
822 first = 0;
823 else
824 *bp++ = ',';
825 (void)memcpy(bp, cp, np - cp);
826 bp += np - cp;
827 }
828 *bp++ = '>';
829 *bp = '\0';
830
831 return (buf);
832}
833
834static void
835cleanup(void)
836{
837
838 /* Simple enough... */
839 (void)close(changer_fd);
840}
841
842static void
843usage(void)
844{
845 int i;
846
847 (void)fprintf(stderr,
848 "usage: %s [-f changer] command arg1 arg2 [arg3 [...]]\n",
849 getprogname());
850
851 (void)fprintf(stderr, "Where command (and args) are:\n");
852 for (i = 0; commands[i].cc_name != NULL; i++)
853 (void)fprintf(stderr, "\t%s%s\n", commands[i].cc_name,
854 commands[i].cc_args);
855 exit(1);
856 /* NOTREACHED */
857}
858