1 | /* vi: set sw=4 ts=4: */
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2 | #include "busybox.h"
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3 | #include <stdio.h>
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4 | #include <stdlib.h>
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5 | #include <string.h>
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6 | #include <sys/mtio.h>
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7 | #include <fcntl.h>
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8 |
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9 | struct mt_opcodes {
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10 | 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 | {
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55 | const char *file = "/dev/tape";
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56 | const struct mt_opcodes *code = opcodes;
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57 | struct mtop op;
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58 | struct mtpos position;
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59 | int fd, mode;
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60 |
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61 | if (argc < 2) {
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62 | bb_show_usage();
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63 | }
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64 |
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65 | if (strcmp(argv[1], "-f") == 0) {
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66 | if (argc < 4) {
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67 | bb_show_usage();
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68 | }
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69 | file = argv[2];
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70 | argv += 2;
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71 | argc -= 2;
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72 | }
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73 |
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74 | while (code->name != 0) {
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75 | if (strcmp(code->name, argv[1]) == 0)
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76 | break;
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77 | code++;
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78 | }
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79 |
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80 | if (code->name == 0) {
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81 | bb_error_msg("unrecognized opcode %s.", argv[1]);
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82 | return EXIT_FAILURE;
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83 | }
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84 |
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85 | op.mt_op = code->value;
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86 | if (argc >= 3)
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87 | op.mt_count = atoi(argv[2]);
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88 | else
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89 | op.mt_count = 1; /* One, not zero, right? */
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90 |
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91 | switch (code->value) {
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92 | case MTWEOF:
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93 | case MTERASE:
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94 | case MTWSM:
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95 | case MTSETDRVBUFFER:
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96 | mode = O_WRONLY;
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97 | break;
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98 |
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99 | default:
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100 | mode = O_RDONLY;
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101 | break;
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102 | }
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103 |
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104 | fd = bb_xopen3(file, mode, 0);
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105 |
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106 | switch (code->value) {
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107 | case MTTELL:
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108 | if (ioctl(fd, MTIOCPOS, &position) < 0)
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109 | bb_perror_msg_and_die("%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 | if (ioctl(fd, MTIOCTOP, &op) != 0)
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115 | bb_perror_msg_and_die("%s", file);
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116 | break;
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117 | }
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118 |
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119 | return EXIT_SUCCESS;
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120 | }
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