miscutils/mt.c

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