LXR busybox/miscutils/mt.c

   1/* vi: set sw=4 ts=4: */
   2/*
   3 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
   4 */
   5
   6#include "libbb.h"
   7#include <sys/mtio.h>
   8
   9/* missing: eod/seod, stoptions, stwrthreshold, densities */
  10static 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
  47static 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
  83int mt_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  84int 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_positive(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}
 141