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