| 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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| 4 | */
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| 5 |
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| 6 | #include "libbb.h"
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| 7 | #include <sys/mtio.h>
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| 8 |
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| 9 | struct mt_opcodes {
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| 10 | const char *name;
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| 11 | short value;
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| 12 | };
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| 13 |
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| 14 | /* missing: eod/seod, stoptions, stwrthreshold, densities */
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| 15 | static const struct mt_opcodes opcodes[] = {
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| 16 | {"bsf", MTBSF},
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| 17 | {"bsfm", MTBSFM},
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| 18 | {"bsr", MTBSR},
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| 19 | {"bss", MTBSS},
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| 20 | {"datacompression", MTCOMPRESSION},
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| 21 | {"eom", MTEOM},
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| 22 | {"erase", MTERASE},
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| 23 | {"fsf", MTFSF},
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| 24 | {"fsfm", MTFSFM},
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| 25 | {"fsr", MTFSR},
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| 26 | {"fss", MTFSS},
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| 27 | {"load", MTLOAD},
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| 28 | {"lock", MTLOCK},
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| 29 | {"mkpart", MTMKPART},
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| 30 | {"nop", MTNOP},
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| 31 | {"offline", MTOFFL},
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| 32 | {"rewoffline", MTOFFL},
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| 33 | {"ras1", MTRAS1},
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| 34 | {"ras2", MTRAS2},
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| 35 | {"ras3", MTRAS3},
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| 36 | {"reset", MTRESET},
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| 37 | {"retension", MTRETEN},
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| 38 | {"rewind", MTREW},
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| 39 | {"seek", MTSEEK},
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| 40 | {"setblk", MTSETBLK},
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| 41 | {"setdensity", MTSETDENSITY},
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| 42 | {"drvbuffer", MTSETDRVBUFFER},
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| 43 | {"setpart", MTSETPART},
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| 44 | {"tell", MTTELL},
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| 45 | {"wset", MTWSM},
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| 46 | {"unload", MTUNLOAD},
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| 47 | {"unlock", MTUNLOCK},
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| 48 | {"eof", MTWEOF},
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| 49 | {"weof", MTWEOF},
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| 50 | {0, 0}
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| 51 | };
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| 52 |
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| 53 | int mt_main(int argc, char **argv);
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| 54 | int mt_main(int argc, char **argv)
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| 55 | {
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| 56 | const char *file = "/dev/tape";
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| 57 | const struct mt_opcodes *code = opcodes;
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| 58 | struct mtop op;
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| 59 | struct mtpos position;
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| 60 | int fd, mode;
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| 61 |
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| 62 | if (argc < 2) {
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| 63 | bb_show_usage();
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| 64 | }
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| 65 |
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| 66 | if (strcmp(argv[1], "-f") == 0) {
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| 67 | if (argc < 4) {
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| 68 | bb_show_usage();
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| 69 | }
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| 70 | file = argv[2];
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| 71 | argv += 2;
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| 72 | argc -= 2;
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| 73 | }
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| 74 |
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| 75 | while (code->name != 0) {
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| 76 | if (strcmp(code->name, argv[1]) == 0)
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| 77 | break;
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| 78 | code++;
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| 79 | }
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| 80 |
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| 81 | if (code->name == 0) {
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| 82 | bb_error_msg("unrecognized opcode %s", argv[1]);
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| 83 | return EXIT_FAILURE;
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| 84 | }
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| 85 |
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| 86 | op.mt_op = code->value;
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| 87 | if (argc >= 3)
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| 88 | op.mt_count = xatoi_u(argv[2]);
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| 89 | else
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| 90 | op.mt_count = 1; /* One, not zero, right? */
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| 91 |
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| 92 | switch (code->value) {
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| 93 | case MTWEOF:
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| 94 | case MTERASE:
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| 95 | case MTWSM:
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| 96 | case MTSETDRVBUFFER:
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| 97 | mode = O_WRONLY;
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| 98 | break;
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| 99 |
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| 100 | default:
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| 101 | mode = O_RDONLY;
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| 102 | break;
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| 103 | }
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| 104 |
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| 105 | fd = xopen(file, mode);
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| 106 |
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| 107 | switch (code->value) {
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| 108 | case MTTELL:
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| 109 | ioctl_or_perror_and_die(fd, MTIOCPOS, &position, "%s", file);
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| 110 | printf("At block %d.\n", (int) position.mt_blkno);
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| 111 | break;
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| 112 |
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| 113 | default:
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| 114 | ioctl_or_perror_and_die(fd, MTIOCTOP, &op, "%s", file);
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| 115 | break;
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| 116 | }
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| 117 |
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| 118 | return EXIT_SUCCESS;
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| 119 | }
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