| lh | 9ed821d | 2023-04-07 01:36:19 -0700 | [diff] [blame^] | 1 | /* vi: set sw=4 ts=4: */ |
| 2 | /* |
| 3 | * Licensed under GPLv2 or later, see file LICENSE in this source tree. |
| 4 | */ |
| 5 | |
| 6 | //usage:#define mt_trivial_usage |
| 7 | //usage: "[-f device] opcode value" |
| 8 | //usage:#define mt_full_usage "\n\n" |
| 9 | //usage: "Control magnetic tape drive operation\n" |
| 10 | //usage: "\n" |
| 11 | //usage: "Available Opcodes:\n" |
| 12 | //usage: "\n" |
| 13 | //usage: "bsf bsfm bsr bss datacompression drvbuffer eof eom erase\n" |
| 14 | //usage: "fsf fsfm fsr fss load lock mkpart nop offline ras1 ras2\n" |
| 15 | //usage: "ras3 reset retension rewind rewoffline seek setblk setdensity\n" |
| 16 | //usage: "setpart tell unload unlock weof wset" |
| 17 | |
| 18 | #include "libbb.h" |
| 19 | #include <sys/mtio.h> |
| 20 | |
| 21 | /* missing: eod/seod, stoptions, stwrthreshold, densities */ |
| 22 | static const short opcode_value[] = { |
| 23 | MTBSF, |
| 24 | MTBSFM, |
| 25 | MTBSR, |
| 26 | MTBSS, |
| 27 | MTCOMPRESSION, |
| 28 | MTEOM, |
| 29 | MTERASE, |
| 30 | MTFSF, |
| 31 | MTFSFM, |
| 32 | MTFSR, |
| 33 | MTFSS, |
| 34 | MTLOAD, |
| 35 | MTLOCK, |
| 36 | MTMKPART, |
| 37 | MTNOP, |
| 38 | MTOFFL, |
| 39 | MTOFFL, |
| 40 | MTRAS1, |
| 41 | MTRAS2, |
| 42 | MTRAS3, |
| 43 | MTRESET, |
| 44 | MTRETEN, |
| 45 | MTREW, |
| 46 | MTSEEK, |
| 47 | MTSETBLK, |
| 48 | MTSETDENSITY, |
| 49 | MTSETDRVBUFFER, |
| 50 | MTSETPART, |
| 51 | MTTELL, |
| 52 | MTWSM, |
| 53 | MTUNLOAD, |
| 54 | MTUNLOCK, |
| 55 | MTWEOF, |
| 56 | MTWEOF |
| 57 | }; |
| 58 | |
| 59 | static const char opcode_name[] ALIGN1 = |
| 60 | "bsf" "\0" |
| 61 | "bsfm" "\0" |
| 62 | "bsr" "\0" |
| 63 | "bss" "\0" |
| 64 | "datacompression" "\0" |
| 65 | "eom" "\0" |
| 66 | "erase" "\0" |
| 67 | "fsf" "\0" |
| 68 | "fsfm" "\0" |
| 69 | "fsr" "\0" |
| 70 | "fss" "\0" |
| 71 | "load" "\0" |
| 72 | "lock" "\0" |
| 73 | "mkpart" "\0" |
| 74 | "nop" "\0" |
| 75 | "offline" "\0" |
| 76 | "rewoffline" "\0" |
| 77 | "ras1" "\0" |
| 78 | "ras2" "\0" |
| 79 | "ras3" "\0" |
| 80 | "reset" "\0" |
| 81 | "retension" "\0" |
| 82 | "rewind" "\0" |
| 83 | "seek" "\0" |
| 84 | "setblk" "\0" |
| 85 | "setdensity" "\0" |
| 86 | "drvbuffer" "\0" |
| 87 | "setpart" "\0" |
| 88 | "tell" "\0" |
| 89 | "wset" "\0" |
| 90 | "unload" "\0" |
| 91 | "unlock" "\0" |
| 92 | "eof" "\0" |
| 93 | "weof" "\0"; |
| 94 | |
| 95 | int mt_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
| 96 | int mt_main(int argc UNUSED_PARAM, char **argv) |
| 97 | { |
| 98 | const char *file = "/dev/tape"; |
| 99 | struct mtop op; |
| 100 | struct mtpos position; |
| 101 | int fd, mode, idx; |
| 102 | |
| 103 | if (!argv[1]) { |
| 104 | bb_show_usage(); |
| 105 | } |
| 106 | |
| 107 | if (strcmp(argv[1], "-f") == 0) { |
| 108 | if (!argv[2] || !argv[3]) |
| 109 | bb_show_usage(); |
| 110 | file = argv[2]; |
| 111 | argv += 2; |
| 112 | } |
| 113 | |
| 114 | idx = index_in_strings(opcode_name, argv[1]); |
| 115 | |
| 116 | if (idx < 0) |
| 117 | bb_error_msg_and_die("unrecognized opcode %s", argv[1]); |
| 118 | |
| 119 | op.mt_op = opcode_value[idx]; |
| 120 | if (argv[2]) |
| 121 | op.mt_count = xatoi_positive(argv[2]); |
| 122 | else |
| 123 | op.mt_count = 1; /* One, not zero, right? */ |
| 124 | |
| 125 | switch (opcode_value[idx]) { |
| 126 | case MTWEOF: |
| 127 | case MTERASE: |
| 128 | case MTWSM: |
| 129 | case MTSETDRVBUFFER: |
| 130 | mode = O_WRONLY; |
| 131 | break; |
| 132 | |
| 133 | default: |
| 134 | mode = O_RDONLY; |
| 135 | break; |
| 136 | } |
| 137 | |
| 138 | fd = xopen(file, mode); |
| 139 | |
| 140 | switch (opcode_value[idx]) { |
| 141 | case MTTELL: |
| 142 | ioctl_or_perror_and_die(fd, MTIOCPOS, &position, "%s", file); |
| 143 | printf("At block %d\n", (int) position.mt_blkno); |
| 144 | break; |
| 145 | |
| 146 | default: |
| 147 | ioctl_or_perror_and_die(fd, MTIOCTOP, &op, "%s", file); |
| 148 | break; |
| 149 | } |
| 150 | |
| 151 | return EXIT_SUCCESS; |
| 152 | } |