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 source tree.
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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 | /* missing: eod/seod, stoptions, stwrthreshold, densities */
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10 | static const short opcode_value[] = {
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11 | MTBSF,
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12 | MTBSFM,
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13 | MTBSR,
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14 | MTBSS,
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15 | MTCOMPRESSION,
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16 | MTEOM,
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17 | MTERASE,
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18 | MTFSF,
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19 | MTFSFM,
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20 | MTFSR,
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21 | MTFSS,
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22 | MTLOAD,
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23 | MTLOCK,
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24 | MTMKPART,
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25 | MTNOP,
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26 | MTOFFL,
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27 | MTOFFL,
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28 | MTRAS1,
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29 | MTRAS2,
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30 | MTRAS3,
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31 | MTRESET,
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32 | MTRETEN,
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33 | MTREW,
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34 | MTSEEK,
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35 | MTSETBLK,
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36 | MTSETDENSITY,
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37 | MTSETDRVBUFFER,
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38 | MTSETPART,
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39 | MTTELL,
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40 | MTWSM,
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41 | MTUNLOAD,
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42 | MTUNLOCK,
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43 | MTWEOF,
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44 | MTWEOF
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45 | };
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46 |
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47 | static const char opcode_name[] ALIGN1 =
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48 | "bsf" "\0"
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49 | "bsfm" "\0"
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50 | "bsr" "\0"
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51 | "bss" "\0"
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52 | "datacompression" "\0"
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53 | "eom" "\0"
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54 | "erase" "\0"
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55 | "fsf" "\0"
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56 | "fsfm" "\0"
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57 | "fsr" "\0"
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58 | "fss" "\0"
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59 | "load" "\0"
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60 | "lock" "\0"
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61 | "mkpart" "\0"
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62 | "nop" "\0"
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63 | "offline" "\0"
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64 | "rewoffline" "\0"
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65 | "ras1" "\0"
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66 | "ras2" "\0"
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67 | "ras3" "\0"
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68 | "reset" "\0"
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69 | "retension" "\0"
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70 | "rewind" "\0"
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71 | "seek" "\0"
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72 | "setblk" "\0"
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73 | "setdensity" "\0"
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74 | "drvbuffer" "\0"
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75 | "setpart" "\0"
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76 | "tell" "\0"
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77 | "wset" "\0"
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78 | "unload" "\0"
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79 | "unlock" "\0"
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80 | "eof" "\0"
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81 | "weof" "\0";
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82 |
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83 | int mt_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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84 | int mt_main(int argc UNUSED_PARAM, char **argv)
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85 | {
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86 | const char *file = "/dev/tape";
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87 | struct mtop op;
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88 | struct mtpos position;
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89 | int fd, mode, idx;
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90 |
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91 | if (!argv[1]) {
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92 | bb_show_usage();
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93 | }
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94 |
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95 | if (strcmp(argv[1], "-f") == 0) {
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96 | if (!argv[2] || !argv[3])
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97 | bb_show_usage();
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98 | file = argv[2];
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99 | argv += 2;
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100 | }
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101 |
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102 | idx = index_in_strings(opcode_name, argv[1]);
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103 |
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104 | if (idx < 0)
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105 | bb_error_msg_and_die("unrecognized opcode %s", argv[1]);
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106 |
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107 | op.mt_op = opcode_value[idx];
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108 | if (argv[2])
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109 | op.mt_count = xatoi_positive(argv[2]);
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110 | else
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111 | op.mt_count = 1; /* One, not zero, right? */
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112 |
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113 | switch (opcode_value[idx]) {
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114 | case MTWEOF:
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115 | case MTERASE:
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116 | case MTWSM:
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117 | case MTSETDRVBUFFER:
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118 | mode = O_WRONLY;
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119 | break;
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120 |
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121 | default:
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122 | mode = O_RDONLY;
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123 | break;
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124 | }
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125 |
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126 | fd = xopen(file, mode);
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127 |
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128 | switch (opcode_value[idx]) {
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129 | case MTTELL:
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130 | ioctl_or_perror_and_die(fd, MTIOCPOS, &position, "%s", file);
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131 | printf("At block %d\n", (int) position.mt_blkno);
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132 | break;
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133 |
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134 | default:
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135 | ioctl_or_perror_and_die(fd, MTIOCTOP, &op, "%s", file);
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136 | break;
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137 | }
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138 |
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139 | return EXIT_SUCCESS;
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140 | }
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